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DEC-00-HRTC-D

June 1973

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Document:	TU56DECtape Transport Maintenance Manual
Order Number:	DEC-00-HRTC-D
Revision:	000
Pages:	74
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/dec-00-hrt/dec-00-hrtc-d.pdf

OCR Text

Digital Eq
u’IIaI d,

Mauna
I'I

qkifigment szfizration
“VII

UVtI-U

Maintenance Manual

angulan

TU56 DECtape TRANSPORT

MAINTENANCE MANUAL

digital equipment corporation mognord. mossochusetts
-

lst Edition June 1970

2nd Printing (Rev) March 1971
3rd Printing October 1971
4th Printing March 1972
5th Printing June 1972

2nd Edition July 1972
2nd Printing January 1973

The material in this manual is for informational purposes and is
notice.

subject to change without

The following are trademarks of Digital Equipment

Corporation, Maynard, Massachusetts:
FLIP CHIP

DECtape

UNIBUS

DECsystem-l 0

PDP

DECmagtape

CONTENTS

Page
CHAPTER 1

GENERAL INFORMATION

1.1

Introduction

l-l

1.2

Specifications

1-1

1.3

Options

1—3

1.4

Major Assemblies and Systems

1-4
1-4

1.4.1

Controls and Indicators

1.4.2

Tape Motion System

1.4.3

Power Supply

CHAPTER 2

1-7

INSTALLATION

2.1

Unpacking and Inspection

2.2

Mechanical Installation

2.2.1

Mounting Support Plate Bracket and Spacer Block Installation

2.2.2

Spacer Support Bracket Installation

2.2.3

Transport Installation

2.3

Electrical Installation

2.4

Operation

2.4.1

Tape Loading and Unloading

2-8

2.4.2

On-Line Operating Procedures

2-8

CHAPTER 3

THEORY OF OPERATION

3.1

Interface

3.1.1

Input Interface Lines

3.1.1.1

Select 0—7

3.1.1.2

CON STOP

3-2

3.1.1.3

CON GO

3-2

3.1.1.4

CON REV REM

3—2

3—1
Command Cable

—

AO6/A07
3-2

3.1.1.5

CON FWD REM

3—2

3.1.1.6

CON ALI. HALT

3-2

3.1.1.7

CON PWR UP DLY

3.1.2

Output Interface Lines

3.1.2.1

Select

3.1.2.2

Write Echo

3.1.3

Bi—Directional Interface Lines

3.1.3.1

Timing Track (TT)

3-3

3-2
—

Command Cable

—

A06/A07
3-2

c110

3-3
—

Information Cable

—

ABlO/ABl 1

3-3

3.1.3.2

Mark Track (MT)

3-3

3.1.3.3

Data Tracks (DO—D2)

3—3

3.2

Functional Information

3-3

3-2.1

Read/Write Head
DECtape Format

3-3

3.3

Local (off-line) Operation

3-5

3.3.1

Forward Tape Motion

3-5

3.2.2

iii

CONTENTS (Cont)

Page
3.3.2

Hold Tape Motion

3-5

3.3.3

Reverse Tape Motion

3-5

3.4

Remote (on—line) Operation

3.4.1

Tape Transport Addressing

3-7

3.4.2

Error Checks

3-7

3.4.2.1

Select Echo

3-7

3.4.2.2

Write Echo

3—8

3.4.3

Tape Motion Control

3.4.4

Write Operation

3-9

3.4.5

Read Operation

3-11

3.5

Module Description

3-11

3.5.1

G847 Dual Motor Voltage Control

3-11

3.5.2

G848 Motor Control Module

3—1l

3.5.3

G859 Clock Regulator Module

3—12

3.5.4

G888 Manchester Reader/Writer Module

3—12

CHAPTER 4

MAINTENANCE

4.1

Recommended Tools and Test Equipment

4.2

Preventive Maintenance

4—1

4.2.1

Weekly PM Procedure

4—1

4.2.2

Monthly PM Procedure

4—2

4.2.3

Tape Care and Cleaning

4.2

4.3

Corrective Maintenance

4—3

4.3.1

Control Panel Lamp Replacement

4.3

4.3.2

Reel Motor

4—3

4.3.2.1

Motor Removal

4.3

4—1

4.3.2.2

Motor Replacement

4—4

4.3.2.3

Reel Hub Clearance Adjustment

4.3.2.4

Reel Motor Electronic Brake Adjustment

4—5

4.3.2.5

40-Hz Oscillator Adjustment

4—5

4.3.3

Read/Write Head

4—5

4.3.3.1

Head Removal

4—5

4.3.3.2

Head Replacement

4—7

Head Output Check

4—7

4.3.3.3
4.3.3.4

Head Skew Check and Adjustment

4—8

4.3.3.5

Write Enable Circuit Check

4—1 1

4.4

Troubleshooting

4.1 1

4.4.1

Initial Checks

4.1 1

4.4.2

Signal Source and Termination Tests

4.14

4.5

Recommended Spare Parts

4—18

APPENDIX A

REFERENCE DRAWINGS

ILLUSTRATIONS
Title

Figure No.

Page

Controls and Indicators

1-4

1-2

Tape Motion System

1-6

1-3

Power Supply Location

1-7

2-1

Outer Packaging

2-2

Inner Packaging

2-2

2-3

H950 Cabinet Support Plate

2-3

Tubular Cabinet Spacer Support Bracket

2-4

2-5

Faceplate Removal

2-5

2—6

Hub and Reel

2—7

3-1

TC08 to TU56 Logic Connection

3~l

3-2

Functional Block Diagram

3—3

3-3

Read/Write Head Arrangement

3-4

Off-Line Manual Operation Flow Chart

3-6
3-10

1-1

3-5

Read/Write Technique

4-1

Reel Motor Removal

4-2

Reel Hub Clearance

4—6

4-3

Head Connector Location

4—8

Skew Tester to Head Cable Connection

4—9

4-5

Head Skew Waveform

4—10

4—6

G848 Motor Control Module Waveforms

4-13

M908 Module Layout

4—15

TABLES
Table No.

Title

Page

Performance Specifications

1-1

1—2

Logic Modules

1-3

l-3

Controls and Indicators

1-4

1-1

2-l

TU56 and TU56H Interface Cabling

2—2

Interface Module Substitution

2-7-

4-1

Recommended Maintenance Equipment

4-1

4—2

Reel Motor Malfunctions

4—11

A
‘1-

Control Panel Malfmrctions

4-12'

4.4

Local Malfunctions

4—12

4—5

Left Transport Source Test Points

4—15

4-6

Right Transport Source Test Points

4—16

4-7

Right and Left Transport Termination Test Points

4—16

4—8

Recommended Spare Parts

4-18

llliTE
“A!“

ISEDEEI
.

>
-

.2351:
AELE

TU56 DECtape Transport

REESTEI

CHAPTER 1
GENERAL INFORMATION

1.1

INTRODUCTION

The TU56 (Dual) or TU56H (Single) DECtape Transport is a solid state, bi-directional, low cost,
data storage device. The Manchester Phase encoding method used in this transport

magnetic tape

ensures reliable data transfer

and reduces tape skew problems. Each tape track is redundantly paired with a second, nonadjacent
track, thus

permitting dependable use of a lower cost (instrumentation) tape without requiring a closely controlled environment.

The TU56 tape speed is 93' inches per second, with a data transfer rate of 33,300 3-bit characters
The simple tape transport mechanism has no capstans or pinch rollers.

per second.

Tape motion is controlled by two ac

induction reel motors. The internal H725 Power Supply furnishes dc
operating power for the reel motors

only.

DC logic power is externally supplied by the tape controller through connectors located on the back of the
power supply. To maintain proper tape tension during forward tape motion, full torque is applied to the forward

reel motor while reduced torque is applied to the reverse reel motor.

Similarly, during reverse tape motion, full

torque is applied to the reverse reel motor while reduced torque is

applied to the forward reel motor. Electronic
braking ensures a positive stop from either direction, without appreciable tape backlash.
With the use of optional interface modules, the solid state switching circuits in the TU56 can be made
with the relay switching circuits in the TUSS and 555

compatible
DECtape Transports. This versatile tape transport can

therefore be used in a variety of installations, including those not

employing Digital Equipment Corporation

(DEC) computers.
1.2

SPECIFICATIONS

Table 1—1 lists the performance specifications of the TU56

DECtape Transport.

Table l-I

Performance Specifications

Characteristic

Parameter

Controller Type and Output Levels

Integrated Circuits

F = ground
T = +5 Vdc

Relay

F i open
T = closed

Solid State

F = ground
T = —3 Vdc

(continued on next page)
1-1

Table 1-1 (Cont)

Performance Specifications
Characteristic

Parameter

Electrical Requirements

Input Voltage

115/220 Vac, 50/60 Hz @ 3A
+5 i 0.5 Vdc @ 0.8A
+10 i 1.0 Vdc @ 0.8A

either +5 or +10 Vdc, but not both*

—15 i 1.5 Vdc @ 0.8A
Power Dissipation

TU56

TU56H

325W (1073 Btu/hr) max
=

162.5W (536.5 Btu/hr) max

Environment
Ambient Temperature

60 to 95°F (15 to 35°C)

Relative Humidity

20 to 80% (no condensation)

Storage Medium
Type

Mylar sandwich, magnetic recording tape

Width

3/4 in.

Thickness

1.25 mil

Data Capacity

2.7 x 106 bits (unformatted)

Format

Manchester Phase Encoding

Tape Reel
Outer Diameter

3-7/8 in.

Diameter Ratio

Approximately 1:1.4 (min. to max.)

Capacity

260 ft

Tape Motion Times
(90% full speed)
Start

150i 15 ms

Stop

100i 10 ms

Turnaround

200 i- 50 ms

Backlash

<1.0 in. tape motion after braking

Tape Transport
Speed

93 i 12 in. per sec (ips)

Recording Density

350 i 55 bits per in. (bpi)

Transfer Rate

33,300 3-bit characters per sec

Dimensions and Weight

Width

19 in. (0.48m)

Depth

17-3/4 in. (0.43m)

Height

10-1/2 in. (0.27m)

Weight

80 lb (37 kg)

Either +5 or +10 Vdc external voltage may be used; however, the internal logic requires +5 Vdc for normal operation. If +10 Vdc is

used, ensure that it is connected to the correct rear terminal; otherwise circuit damage will result.

1-2

1.3

OPTIONS

The TU56 DECtape Transport is available in the following standard models:
0

TU56 (Dual) Transport

TU56H (Single) Transport

In addition, two customer options, designated TU5 6M (Dual) and TU56HM (Single), permit the standard trans—

port models to be used alone or connected with other nonstandard peripherals. If either option is used, five G888

Read/Write Amplifier modules must be inserted into slots A13, A14, B13, B14, and BIS of the logic mounting
block. Interface cabling as indicated in Table 2-1 must be used. If more than one transport is connected to a

single controller, only the first transport of the “daisy chain” need contain the G888 modules. If the transport is
connected to a controller that has relay driver outputs, the M941 Jumper modules in slots A04 and A05 must be

replaced withW513 Level Amplifier modules. Table 1-2 lists the logic module complement of each transport model.

Table 1-2

Logic Modules
Quantity
TUS 6

TUS 6H

Dual Transport

Single Transport

Module Name

Type

(I) G742

G859

(2) M941

Jumper Card

(1) M531

Bus Converter

M040

G851

Relay

M1 17

6-4 Input NAND Gate

M1 13

10-2 Input NAND Gate

M302

Dual Delay MV

G848

Motor Control

M908

Connector

W032

Cable Connector

G888 option

Manchester Reader/Writer

M922

Cable Connector

(3) M923

G847

(3)

Positive Logic Jumper Card
Clock Regulator

Solenoid Driver

Option

Cable Connector
Dual Motor Voltage Control

(1) M531 used with negative logic controller. G742 used with positive logic controller.
(2) Replace with a W513 when transport is connected to a relay driver controller.
(3) Required only when transport is connected with nonstandard peripherals, or is to be used alone.

1.4
1.4.1

MAJOR ASSEMBLIES AND SYSTEMS
Controls and Indicators

The controls and indicators (Figure 1-1) required for normal operation are located on the front of the transport
cabinet. Table 1-3 describes the function of each control or indicator.

WEA‘GTEI

Figure l-l Controls and Indicators

Table 1-3
Controls and Indicators
Controls and Indicators

REMOTE/OFF/ LOCAL
(rocker switch)

Logic Symbol
SW2

Description
Placing this switch in one of the following positions
accomplishes:
a.

REMOTE

—

disables the Fwd/Hold/ Rev switch

and places the transport under computer control

(on-line).
b. LOCAL

—

enables the Fwd/Hold/ Rev switch and

removes the

transport from computer control

(off—line).
c.

OFF

removes power from

removes the

the reel motors and

transport from computer control.

(continued on next page)

Table 1-3 (Cont)
Controls and Indicators
Controls and Indicators

—->

Logic Symbol

Description

4-—

Fwd/ Hold/ Rev

SW3

(rocker switch: spring-loaded to
Hold)

Placing this switch in "the Fwd position (provided
REMOTE/OF F/ LOCAL is in LOCAL) moves the
tape from left to right across the read/ write head.
When this s‘c‘i is

the sprg—‘caded Hold pestle“
(provided REMOTE/OFF/ LOCAL is in LOCAL), the
tape remains stationary.

Placing this switch in the Rev position (provided
REMOTE/OFF/ LOCAL is in LOCAL) moves the tape
from right to left across the read/ write head.
Address Select

SW1

Configures the transport logic to respond to the address indicated on the thumbwheel.

(0 to 7 thumbwheel switch)
WRITE ENABLE/WRITE LOCK

SW4

(rocker switch)

Placing this switch in the WRITE ENABLE position
lights the WRITE indicator and allows a write operation.

Placing this switch in the WRITE LOCK position turns
off the WRITE indicator and prevents a write operation.

REMOTE SELECT

Lights when the transport is in the remote (on—line)
mode and is selected by the controller.

(indicator)

Goes off when the transport is in the off or local

(off-line) modes or is deselected by the controller.
WRITE

(indicator)

Lights when the WRITE ENABLE/WRITE LOCK
switch is in the WRITE ENABLE position.

Goes off when the WRITE ENABLE/WRITE LOCK
switch is in the WRITE LOCK position.

1.4.2 Tape Motion System
Each half of the dual tape motion system (Figure 1-2) consists of: two ac induction reel motors (mounted
behind the hinged mounting panel), two tape reel hubs, a tape guide assembly, and a read/ write head. Tape
motion from the supply reel, over the tape guides and read/ write head, and onto the take-up reel is directly

controlled by the two 600—rpm induction reel motors that drive the reel hubs. The solid state switching circuits
that control the reel motors govern the amount of torque applied to each motor. For forward tape motion, full

torque is applied to the forward motor (take-up reel) and reduced torque is applied to the reverse motor (supply

reel). This condition establishes the direction of the tape motion and maintains the proper tape tension without
the use of capstans, pinch rollers, or drag pads.

Similarly, the opposite reel motor conditions are necessary for

reverse tape motion.

1-5

IRENE
ENhSlE

HEIOFEI
‘

‘

"an:
ENAatE

)4:

several

READ/WR'TE
HEAD

“RITE
I LOCK

TA P E
GUIDE

TAPE
REEL

REEL

HUB

Mounting Panel (closed)
COOLING FAN

T82
REEL

MOTORS

Mounting Panel (opened)

Figure 1—2 Tape Motion System

Since a separate track containing timing information plus a Manchester Phase encoding technique is used, tape

speed can vary as much as i20 percent without affecting the read/ write reliability. Dynamic braking of the
reverse

motor causes a positive stop without adverse tape backlash. Whenever the tape is motionless, both motors

apply partial torque to maintain the tape position.
NOTE

During tape motion, the high harmonic content of the 40-Hz
square wave that supplies the tape reel motors produces small,
cyclic variations in the power output of the motors. These
variations cause an audible hum which varies in intensity as the
reel being driven by a particular motor fills with tape. Such
behavior is normal and has no effect on the performance of
the transport.

1.4.3

Power Supply

The H725 Power Supply, located in the left rear portion of the transport cabinet (Figure l-3), furnishes +18 and

+38 Vdc operating power for the reel motors only. A convenience outlet on the back of the supply furnishes
l 10/ 220, 50/60 Hz ac power. AC operating power for the cooling fan is obtained directly from the input line

voltage, through terminal connector TB2 located on the front of the power supply. The +5 Vdc logic operating
power is supplied by either an external source or is generated internally by a voltage regulator on the G859 Clock

and Regulator module. When +10 Vdc is connected to TBl (+10 terminal) of the power supply, the regulator
reduces this external level to +5 Vdc for internal use. When +5 Vdc is connected to TBl (+5 terminal), the

regulator is bypassed and the external level is directly used internally. For this reason, it is important that the
external dc power connection be made to the correct TBl terminals.

POWER
SUPPLY

T81

LOGIC
MODULES

CONVENIENCE
OUTLET

Figure l—3 Power Supply Location

l-7

CHAPTER 2

INSTALLATION

2.1

UNPACKING AND INSPECTION

Do not drop or subject the transport to unreasonable impact.

Carefully unpack the TUS 6 DECtape Transport as

follows:
1.

Open the outer carton (Figure 2-1) and remove the top four toro pad cushions.
TORO
8

PAD

PLACES:
4

TOP

BOTTOM

INNER SHIPPING

OUTER

CARTON

SHIPPING

CARTON

cp-OZBO

Figure 2-1 Outer Packaging

2-1

Lift out the inner carton and open it (Figure 2-2).

Remove the back and side support laminated pieces.

Lift the transport out of the inner carton and unbolt the shipping bracket.

Replace the shipping

bracket screws in the transport chassis and retain the packing materials for possible return shipment.
5.

Inspect the transport and report any damage to the carrier and Digital Equipment Corporation.

POWER

4 SUPPLY
a

SHIPPING

BRACKET
000

£00

SIDE SUPPORT
LAMINATED PIECE (2)

REAR OF TRANSPORT
VIEW

BACK

SUPPORT

LAMINATED

CORNER

PIECE

SUPPORT

LAMINATED

PIECE

SHIPPING BRACKET

(INTERIOR) VIEW A

BACK

FOAM TAPE
GUIDE PROTECTOR

SUPPORT
PIECE

LAMINATED

INNER CARTON

CP-OZBZ

Figure 2-2 Inner Packaging

2-2

2.2

MECHANICAL INSTALLATION
YF/

To install the Tbao DECtape Transport in the cabinet, two different mounting support brackets are available.

The mounting support plate bracket with spacer blocks (7408321 and 7408322) is for transport installation in
an H950 cabinet.

The U-shaped spacer support bracket (7408009) can be ordered separately and is for transport

installation in a tubular-type cabinet. The following paragraphs describe the bracket installation procedures for
both cabinet types.

Mounting Support Plate Bracket and Spacer Block Installation

2.2.1
1.

Place the mounting support plate (7408321) in the H950 cabinet and secure it to the front of the
cabinet mounting rails (Figure 2-3).

Install the spacer blocks and secure them to the side of the cabinet mounting rails.

Secure the spacer blocks to the mounting support.

Spacer Support Bracket Installation

2.2.2
1.

Place the spacer support bracket ( 7408009) in the tubular cabinet and secure it to the cabinet front
with the mounting hardware (Figure 2-4).

Attach four clip-on speed nut fasteners to the spacer support bracket.

1/4 /20 TRUSS
KEEPER

HEAD

SCREW

NUT(2)
/_W|TH
BRACKET (7408321)
/ [MOUNTING
SPACER

BLOCK (2)

FRONT OF CABINET

(740832 2)
10/32

TRUSSHEAEHZ)
e
Q

0
a)
0

0
0
0

%
+—

CABINET
MOUNTING
RAILS

CP- 0032

Figure 2-3 H950 Cabinet Support Plate

CABINET
MOUNTING
HOLES (4)

1°

TUBULAR
TYPE
CABINET

:
‘.

MOUNTING

/ HARDWARE (4)

.5.

4
I
SPACER SUPPORT

Hm
SP— 028!

Figure 2—4 Tubular Cabinet Spacer Support Bracket

2.2.3

Transport Installation

The tape transport may be installed in a cabinet without removing the transport mounting panel; however, the

mounting panel weight makes this practice difficult. It is best, as described in the following procedure, to first
remove the

mounting panel, then install the transport.

Remove the M922 Ribbon Cable Connectors from slots B04 and B17 of the logic module mounting
block at the rear of the transport (Figure 2-5A).
Disconnect the 22-pin Amphenol head cable connector from the rear of the G851 Relay modules in

slots AB09 and AB12.
Turn the mounting panel side locking fasteners (Figure 2-5B) one-quarter turn to unlock the mounting

panel
Carefully lower the mounting panel until the support struts are fully extended (Figure 2-5C).
Disconnect the reel motor cable connectors (Figure 2-5C) by pressing the locking tabs, which extend

from one of the Mate—N—Lok connectors, against the side of the connector body and separating the
connector halves.

NOTE
If the reel motor connectors are held to the chassis by a nylon

cable holder, remove the top of the holder and free the cable.
Route the head and ribbon cables from the back to the front of the transport.

Support the mounting panel and remove the support strut mounting screws.
Tilt the mounting panel slightly upward, pull it forward, then lift up the rear to free it from the

transport.
Mount the transport in the cabinet with four Phillips No. 10-32 truss-head screws and keeper nuts.
10.

Reinstall the mounting panel by performing Steps 1 through 8 in reverse.

RIBBON CABLE
CONNECTORS

-----

AMPHENOL
HEAD
CONNECTORS

MOTO R
CONNECTOR
R EEL

LOCKiNG
FASTENER

I 'lfl’TE

REIQ?E I

REEOTEI

EiAILE

’

SUPPORT
STRUTS

Locking Fastener Location

Mounting Panel Opened

Figure 2-5 Faceplate Removal

[:3 J1

Table 2-2

Interface Module Substitution

Control Type

Integrated Circuit

Relay
Solid State

TAPE

Required

Quantity

Module

Position in

Mounting Block

Loglc Level

G742

A05

M941

A18, A04

W513

A04, A18

open

M531

A05

closed

M941

A04, A18

M531

A05

—3

REEL—>

SMALLER
C|RCUMFERENCE

.017
HUB CLEARANCE

__.._._—‘—.

MOUNTING
PANEL

MOTOR
SHAFT

3—;- REEL—->

-___f_1{T
10-0178

Figure 2-6 Hub and Reel

2-7

Check the transformer tap connections of the H725 Power Supply (Drawing CS-725-O—l) to ensure
that the power supply is configured properly for the input power to be used.
Insert the ground, —15, and +10 or +5 Vdc spade lugs into the proper TBl terminals on the rear of the
power supply.

Plug the power cord into the ac line receptacle.
Load a tape (Paragraph 2.4.1) and operate the transport in the local mode to ensure proper electrical
and mechanical operation.

2.4

OPERATION

Tape Loading and Unloading

2.4.1

To load tape, proceed as follows:
1.

Set the REMOTE/OFF/ LOCAL switch to OFF.

Position a full tape reel so that the labeled side is out and the smaller circumference is against the left
hub (Figure 2-6). Press the reel fully onto the hub ensuring that the reel is evenly seated (not cocked).

NOTE
If the transport is connected to a PDP-12 system, mount the full
reel on the right hub since forward tape motion for the PDP-12

is from right—to-left instead of left-to-right.
Mount an empty take-up reel on the right hub as described in Step 2.
Route the tape from the left reel, over the tape guides and read/write head, to the right side of the

take-up reel.
Hold the free tape end against the take—up reel hub and rotate the take-up reel clockwise, winding four
or five

turns of tape onto the reel.

Verify that power is applied to the transport and set the REMOTE/OFF/ LOCAL switch to LOCAL.
Press and hold the Forward switch (-v ) for about 3 seconds, allowing approximately 15 turns of tape
to wind onto the take-up reel.
ensures that the

(Press the Reverse switch (4—) for a PDP—l 2 system.) This action

data portion of the tape is positioned over the read/write head.

To unload tape, proceed as follows:
Set the REMOTE/ OFF/ LOCAL switch to LOCAL.
Press and hold the Reverse switch (4—) until the tape has completely rewound onto the left supply

reel (right supply reel for a PDP-12 system).
Set the REMOTE/ OF F/ LOCAL switch to OFF and remove the supply reel.

2.4.2

On-Line Operating Procedures

Verify that power is applied to the transport and load the appropriate tape (Paragraph 2.4.1).
Set the Address Select switch of the transport to be used to the desired address and positiOn the

WRITE ENABLE/WRITE LOCK switch as desired.
Set the REMOTE/OFF/ LOCAL switch to REMOTE.

2-8

CHAPTER3
THE ORY OF OPERATION

3.1

INTERFACE

Standard interface connection of the TU56 DECtape Transport is made with an information cable to slots AB 1 0
or ABl 1

and a command cable to slots A06 or A07 of the logic mounting block. (Refer to Table 2-1 for the

controller model and corresponding interface cable type, and Table 2-2 for the module substitutions.) These
connector slots are parallel-wired so that up to eight transports may be serially connected in a multi—transport

“daisy chain” configuration (i.e., connectors AB10/ ABll and A06/A07 of the first transport are connected in
series to connectors ABlO/ABI 1 or A06/A07, respectively, of the following transport, etc.).

If the TU56 is connected to a TCO8 Controller, the following logic considerations must be understood. Command

signals leave the controller M623 Bus Driver module via a 70-06223 cable. In the transport, these signals pass
through an M941 Jumper module to an M531 Bus Converter module. If the input to the controller M623 module
is ground, the output is ground; if the input is +3V, the output is -3V. The M531 module in the transport has the

input/ output requirements reversed from those of the M631. That is, a ground input produces a ground output;
however, a -3V input produces a +3V output.

Figure 3-1 illustrates the TC08 to TU56 logic connection. If BMR 01 (l) L is true, GO H is false. To maintain
compatibility between the various available controllers and the transport, signals such as CON GO, CON STOP,
CON REV REM, and CON FWD REM are reversed inside the 70—06223 cable (i.e., the actual signal appearing at

point 2 in Figure 3-1 is T STOP L). For this reason, the 70-06223 cable must not be installed backwards. If the
cable is reversed, the system will not operate.

Tcoe.

COMMAND CABLE 70-06223

BMR or. m L

GND

‘fi
"1

-____

M623

)

GND

I
f

_____

GND

l\
M941

GND

GO H

__.____L_______._______
CP-OZB?

Figure 3—1 TCO8 to TU56 Logic Connection
3-l

Figure 3-2 illustrates and the following paragraphs describe the function of each interface line when the transport
is connected to a solid state controller with logic levels of —3V

Input Interface Lines

3.1.1

Select 0—7

3.1.1.1

—

Command Cable

——

—

T and ground

A06/A07

These eight lines and the eight-position Address Select thumbwheel on the control panel

determine the transport address assignment and selection. In a particular transport, only one of these lines is

internally connected (via the Address Select switch) to the transport select logic. In order to select a transport,
the controller places a ground level on the desired SELECT line. This line then remains at ground during the
entire read, write, or control operation. When the transport is not selected, the SELECT line is at —3V.

3.1.1.2

CON STOP

—

This line transmits a signal to stop tape motion. The controller places a —3V level on this

line to reset the Motion L flip-flop and thus terminate tape motion. (CON GO and CON STOP are complementary

signals.)
3.1.1.3

CON GO

—

This line transmits a'signal to initiate tape motion. The controller places a ~3V level on this

line to set the Motion L flip-flop.
accompany this signal.

3.1.1.4

During normal operation, a CON REV REM or CON FWD REM signal must

(CON STOP and CON G0 are complementary signals.)

CON REV REM

—

This line transmits a signal to designate reverse tape motion. The controller places a

—3V level on this line to reset the Direction L flip-flop and thus reverse tape motion.

During normal operation, a

CON GO signal must accompany this signal. (CON REV REM and CON FWD REM are complementary signals.)

CON FWD REM

3.1.1.5

—

This line transmits a signal to designate forward tape motion. The controller places a

—3V level on this line to set the Direction L flip-flop and thus initiate forward tape motion. During normal

operation, a CON GO signal must accompany this signal. (CON FWD REM and CON REV REM are complementary signals.)

3.1.1.6

CON ALL HALT

—

This line transmits a signal to stop tape motion whenever the computer program is

halted. If the computer program halts, either by instruction or operator intervention while the tape is in motion,
the tape would continue to run off the reel. To prevent this, the controller places a —3V level on this line to
reset the Motion L flip-flop whenever the computer program halts.

3.1.1.7

CON PWR UP DLY

to the computer.

—

This line transmits a signal to prevent tape motion while initial power is applied

During the computer power—on sequence, the controller places a ground level on this line that

applies a +18V brake signal to both reel motors. When the computer is successfully powered-up, this line goes to
—3V.

3.1.2
3.1.2.1

Output Interface Lines
Select Echo

—

Command Cable

—

AO6/AO7

This line transmits an analog signal to indicate the transport selection status. When the

transport is'in the remote mode, a —6 to —9V signal on this line indicates that only one transport has been

properly selected. A 0V signal indicates that no transport has been selected. A -9 to —15V signal indicates that
more than one

transport has been selected. (Refer to Paragraph 3.4.2.1 for a detailed description.)

3-2

804
L

DlSCONNECT

L WRT ENABLE

%IWRT

I
:

ECHO

_.
'

I
I
SELECT o 7
_

(8)

SELECT
LOGIC

L-

L FWD LOC

L REV

Loc

SOLENOiD
DRIVER

==
“

SELECT ECHO

L HOLD

SELECT

MO ‘3

‘-

MO‘

A05
CON

STOP

CON

REV MEM

CON REV MEM
_

BUS

CON FWD MEM
CON

ALL

CONVERTERS

FWD REM
ALL HALT

HALT

MOTION a
DIRECT|ON
LOGIC

HEAD
RELAY

PWR

(3)

L DIR1

CON PWR UF’ DLY

<3)

DL“
L

BRAKE

~——~|TT

DLY

(3)

REEL MOTOR
DRIVE LOGlC

R/W

;HEAD
l

FWD
MOTOR

REV

MOTOR

I
I

l
l

R/w DATA (15)

!
(SP-0285

Figure 3-2 Functional Block Diagram

3-3

Write Echo

3.1.2.2

—

This line transmits a signal to indicate the transport “write protect” status. If the transport

is write protected (write capability inhibited), this line is at -3V. If the transport is not write protected, this line
is at ground.

Bi—Directional Interface Lines

3.1.3

Timing Track (TT)

3.1.3.2

Mark Track (MT)

3.1.3.3

Data Tracks (DO—D2)

3.2

—

Information Cable

—

ABlO/ABll

This line transmits timing pulses to or from the transport timing tracks.

3.1.3.1

——

—

This line transmits mark channel information to or from the transport mark tracks.

——

These lines transmit data or control words to or from the transport data tracks.

FUNCTIONAL INFORMATION

Since the TU5 6 DECtape TranSport is a dual system, each transport contains identical logic. Figure 3-2 is a
functional block diagram of only the left (L) transport logic. The following paragraphs describe the detailed

logical operation of the left transport when it is connected to a negative logic (T

—3V, F

0V) controller. The

right (R) transport operates in an identical manner as the left and is therefore not described.
3.2.1

Read/Write Head

The recording device (read/write head) contains ten read/write coils which are electronically connected in non-

adjacent pairs. When the tape is loaded, each coil covers a narrow path along the tape (Figure 3-3). Since it is
possible to write in the data tracks (inner tracks) and simultaneously read from the timing and mark tracks (outer
tracks), the timing and mark coils are slightly separated by additional shielding from the data coils. During a
write operation (Paragraph 3.4.4), each coil pair records identical information.

During a read operation (Paragraph

3.4.5), the output from the coil pairs is connected in series to differential amplifiers. Since the differential amplifiers use a zero-crossing detection scheme, the effects of amplitude changes over a wide range are negligible. The

analog sum of the coil pair signals determines the correct value (either logical l or O) of the recorded bit. Thus,
for a read operation, information from one track combines with redundant information from another non-

adjacent track to generate a single Channel output signal. This redundant read/write scheme greatly reduces the

possible loss of recorded information due to foreign matter on the tape or head. In addition, the pairing of nonadjacent tracks minimizes the adverse effects of tape skew.
3.2.2

DECtape Format

The TUS 6 Transport uses the standard DECtape formatted tapes, furnished by DEC, as a storage medium. These

blank tapes are supplied with the timing and mark tracks prerecorded at the factory by a write head with zero
skew.

Consequently, these tapes may be used on any transport where the head skew is within specifications. The

timing and mark tracks can also be recorded on used tape by a customer tape system. However, unless the
customer write head has less than a ZOO-microinch skew, it is possible that the formatted tapes generated on a

customer transport may not be interchanged among all other transports.

There are ten tracks across the 3/4—inch wide DECtape (Figure 3-3). The two outer tracks (timing tracks) are

electronically paired to form one timing channel that is used to synchronize and control read/write operations.
The timing track is prerecorded with alternating positive (TPO) and negative (TPl) flux reversals at a fixed frequency.

During a write operation, these alternating flux reversals are read from the timing track. The positive

flux reversal (TPO) loads the data to be recorded into a write buffer in the controller for transfer over the data
lines. The negative flux reversal (TPl) complements the write buffer and by so doing, reverses the write current

in the write coils.

Thus, if a O is to be written, the write current is switched negative, resulting in a negative flux

Conversely, if a l is to be written, the write current is switched positive. During a read

reversal on the tape.

operation, TPl generates a strobe within the controller that allows sampling of the data lines during peak data
signal amplitudes.
The two tracks directly adjacent to the timing tracks (mark tracks) are paired to form a mark channel that designates the type of information (either control or data words) contained in the data tracks.

A unique 6-bit code in

the mark track identifies the tape location (e.g., beginning of block, end of block, data, etc.) and the type of
information stored at that location. Since a read or write operation can be performed while the tape is moving
forward or reverse, the mark track bits, when decoded, are identical (symmetrical) for data read from either
direction. In addition to being symmetrical, the mark track codes are designed so that a single bit error can not

change one valid code into another.
The six inner tracks (data tracks) are grouped at the center of the tape where they are least affected by tape skew.
These six tracks are coupled to form the three data channels. A control word in the data channel is six frames

long (as determined by the 6-bit mark track code) and contains 3 bits per frame (18 bits total). These control
words store address and checking information and provide compatibility between computers using l2, 16, 18,

32, or 36-bit words. A data word in the data channel contains stored information and occupies at least four 3-bit
frames (12 bits).

TRANSPORT
MOUNTING
PANEL

3/4

INCH
MAGNETIC
TAPE

4’2;
)4

READ/WRITE

COILS

404— «9

’39

4,
,1;

’79

‘3

I”

’9

NOTEi
Each coil pair is actually wired in series, with two wires
connected to a differential amplifier. However, for simplicity,

only

single wire from each pair

shown.
CP-0284

Figure 3-3 Read/Write Head Arrangement

9) A

LOCAL (off-line) OPERATION

3.3

Figure 3—4 illustrates and Paragraphs 3.3.1 through 3.3.3 describe the logical sequence of events during off-line
manual operation of the transport.

3.3.1

Forward Tape Motion

Placing the REMOTE/OFF/LOCAL switch SW2 (Drawing BS-TU56-0—TLD, sheet 2) on the control panel in
’

LOCAL, applies ground to the center wiper of t1“6 Forwdar Hold Reverse switch SW3.1f es
11

switch is

pressed:11.1d held1‘11 the Forward pesto“, L FWD- C—C AL (Draww

“BS -TU56-

g-ioaded SW3

-TLD, sheet 1)- goes low

and is applied to both pin H1 of the M1 17 DirectionT

flip—flop, and pin Bl of the Motion L flip-flop. This action

sets both flip-flops, generating the L M01 and L DIRl

high signals. These signals are then ANDed at gate M1 13

pins P1 and R1. The low M1 13 pin 81 output is inverted high and applied to the G847 module, then applying
a +38V run
a +18V

signal to the forward motor. Simultaneously, input pin N2 of the G847 module goes low, applying

drag signal to the reverse motor.

When SW3 is released, the center wiper returns to the Hold position. This action generates the L HOLD low signal,

terminating tape motion.
3.3.2

Hold Tape Motion

Placing the REMOTE/OFF/ LOCAL switch SW2 (Drawing BS-TU56-O-TLD, sheet 2) on the control panel in
LOCAL, applies ground to the center wiper of the Forward/Hold/ Reverse switch SW3. With SW3 in the springloaded Hold position, L HOLD (Drawing BS-TUSé-O-TLD, sheet 1) goes low and is applied to inverter G859 pin

K2, generating L RESET low.
If forward tape motion is occurring when the Hold switch is enabled, L RESET, when applied to pin E2 of the
M117 Motion L flip-flop, resets the flip-flop generating L MOI low. This action triggers the IOU-millisecond
L Brake one-shot to produce the L BRAKE high signal. L BRAKE and L MOO (high because the Motion flip-flop
is now reset) are ANDed with L DIRl at gate M1 17 pins T2, S2, and R2. The low M1 17 pin V2 output is inverted

high and applied to the G847 module, thus applying a +38V brake signal to the reverse motor.
If reverse tape motion is occurring when the Hold switch is enabled, L DIRO is high and the +38V brake signal is

applied to the forward motor.
If no tape motion is occurring when the Hold switch is enabled, the Motion flip-flop is already reset when
L RESETis produced.

produced.
are

Consequently, the L Brake one-shot is not triggeredand the L BRAKE signal is not

If this occurs, the outputs from inverters M113 pins K1 and K2 are both low, and +18V drag signals

simultaneously applied to both the forward and reverse motors. Thus, tape tension is retained while the tape

is motionless

3.3.3

Reverse Tape Motion

The logical sequence for reverse tape motion is similar to forward tape motion except that L REV LOCAL resets
the Direction L flip-flop, causing the +38V run signal to be applied to the reverse motor and the +18V drag signal
to be applied to the forward motor.

(Refer to Paragraph 3.3.1 for a detailed description of forward tape motion.)

3-5

REMOTE/OFF/LOCAL
SW2
TO LOCAL

GROUND
‘—

._>

FWD/HLD/REV
SW3

APPLY

TO
8

+18V

RESET

SET

FORWARD

MOTION

REVERSE

FLIP-FLOP

MOTORS

TRIGGER
L

DIRECTION

MOTION

FLIP—FLOPS

RESET
DIRECTION 8
SET

APPLY +38V

BRAKE

ONE-SHOT

MOTION

FLIP—FLOPS

TO FORWARD

APPLY +38V

8 +18V TO

TO REVERSE

REVERSE

MOTORS

FORWARD

+18V

MOTORS

APPLY +3BV
T
REVER S E

MOOTOR

APPLY +33V
T0

FORWARD

MOTOR

STOP
TAPE
MOT|ON

db
CP-OZBS

Figure 3-4 Off-Line Manual Operation Flow Chart

3.4

REMOTE (on-line) OPERATION

The actual remote transport operation is relatively simple, however, a minimal explanation of the controller

operation is also included in the following description. This additional controller explanation is necessary for a

comprehensive understanding of the overall system operation. If the transport is connected to a controller other
than the one previously described (Paragraph 3.1), optional logic converter modules as indicated in Table 2-2 and
on the

logic drawings must be used.

3-6

3.4.1

Tape Transport Addressing

For greater flexibility in a multi-transport system, the transport address can be changed by changing the position

of the Address Select thumbwheel SW1 (Drawing BS-TU56-0-TLD, sheet 2) on the control panel. The eight
SELECT interface lines (numbered 0 through 7) are directly connected to the contacts of the correspondingly

numbered SW1 switch positions. Placing this switch in any one of the eight positions connects the wiper arm to
the associated SELECT interface line.
NOTE
On a duai transport (TUSS) there are two Address Seiect switches
that function independently. These switches are not interlocked.

Therefore, if the operator should inadvertently configure two or
more transports for the same address, the controller will detect a
select error (Paragraph 3.4.2.1).
The wiper arm output is then applied through an M941 Jumper module (Paragraph 1.3) to pin 82 of the M531

Negative Bus Converter module (Drawing BS-TU56-0-TLD, sheet 1). When the controller applies ground to the

appropriate SELECT interface line, L SELCODE goes low. This signal is then applied through inverter M113
pins T2, U2 (Drawing BS-T '56-0-TLD, sheet 2) to M1 13 pin El.
If the REMOTE/ OF F/ LOCAL switch is in the REMOTE position, L REMOTE, applied through inverter M113

pins P2, R2 (Drawing BS-TU56-0—TLD, sheet 1), ANDs with the M113 pin V2 inverter output (Drawing
BS-TU56-0-TLD, sheet 2) to generate L SELECT high, plus L DISCONNECT high. The L SELECT high signal
allows the transport to perform the various control and read/ write operations. The L DISCONNECT high signal

energizes the head relays connecting the read/ write coils to the interface data lines. In addition, L DISCONNECT
is applied to connector M922 pin Sl, lighting the REMOTE indicator on the front panel.

3.4.2

Error Checks

If a Write Command is issued to a transport that has not been selected or the transport is write protected, one or
both of the echo signals described in the following paragraphs are generated. If this occurs, an error flag signal is

produced in the controller which prevents further transport operation until the error is corrected.
3.4.2.1

Select Echo

-—

If a transport has been properly selected by the controller (Paragraph 3.4.1), L SELECT

is at ground. This signal, applied to solenoid driver M040 pin J 2 (Drawing BS-TU56-0-TLD, sheet 1), produces a

negative output at pin S2. The negative M040 pin S2 output, when applied through a 100-52 resistor, results in a
'

—6 to -9V SELECT ECHO analog Signal at A06 pin P1. The anaIOg output at P1 is then transmitted over the
interface lines to a transport detector module in the controller. A —6 to —9V input at the transport detector produces a +3V output, indicating that only one transport has been

selected.

Selection of more than one transport places the 100—9 resistors of the respective transport SELECT ECHO circuits
in parallel and thus decreases the SELECT ECHO signal level below —9V (—9 to -15V). When this occurs, the

output from the transport detector goes to 0V, indicating an error condition.
If no transport is selected, the SELECT ECHO output at A06 pin P1 is 0V. A 0V input at the transport detector
also results in a UV output indicating an error condition. Thus, if the operator inadvertently chooses the same
address for more than one transport, or if no transport address is chosen, an error flag is generated in the controller
that prevents further tape operation on the affected transpOrts until the selection error is corrected.

NOTE
When the transport is connected to a 550, 551, or 552 control-

ler, the preceding select error detection method is not used and
the external 100-52 resistors are removed.

3-7

Write Echo

3.4.2.2

—

In order to record information on a selected transport, the WRITE ENABLE/WRITE

LOCK switch (SW4) on the control panel must be in the WRITE ENABLE position. If this is the case, the left

wiper of SW4 (Drawing BS-TUS 6-O—TLD, sheet 2) closes to complete the L1 (WRITE ENABLE) ground return
and light the indicator.
If the transport has been properly selected (Paragraph 4.3.1), the signal L DISCONNECT at M922 pin S1 is at

ground.

L DISCONNECT at ground applies an approximate ground to the diode/resistor biasing junction of

the right SW4 wiper. With this circuit configuration, a slightly positive turn-on voltage is applied to the base of
the 2N6531 transistor, causing it to conduct and produce a ground (L WRT ENAB high) at M922 pin Al. Once

the 2N6531 transistor conducts, the three D664 diodes form a voltage regulating network to maintain a nearly
true ground at pin A1.

L WRT ENAB high, applied through the M941 Jumper module (Drawing BS-TU56—0-TLD,

sheet" 1) to connector A06 pin 81, produces WRITE ECHO high. WRITE ECHO high is then transmitted over
the interface lines to the controller, indicating that the selected transport is available for a write operation (not
write protected).
If the transport has not been selected, the signal L DISCONNECT is at —15V. L DISCONNECT at —15V applies

approximately

—

13.5V to the diode/ resistor biasing junction (Drawing BS-TU56-0-TLD, sheet 2). With this cir-

cuit configuration, a negative cut-off voltage is applied to the base of the 2N6531 transistor, allowing current
flow through the 12K emitter resistor to produce —3V (L WRT ENAB low) at M922 pin A1.

Similarly, if the

WRITE ENABLE/WRITE LOCK switch is placed in the WRITE LOCK position, the L1 indicator is turned off
and the diode/resistor biasing junction is completely disconnected, thus producing —3V at M922 pin Al. With

pin A1 at —3V, the WRITE ECHO signal is suppressed, preventing the computer from issuing a Write Command
to a transport that has not been selected or one that is write protected.

3.4.3

Tape Motion Control

The following paragraphs describe tape motion control for a forward read or write operation. A reverse tape

operation is similar to a forward operation except that the opposite command interface conditions are necessary.
To perform a forward read or write operation, the controller first receives a Read or Write Command from the

computer. Specific bits within the command structure designate the transport address, the direction the tape is
to be moved, and the desired block number. The controller than simultaneously addresses the appropriate tape

transport (Paragraph 3.4.1), places a —3V level on the CON GO and CON FWD interface lines, complements the
CON STOP and CON REV REM interface lines, and triggers an internal up—to-speed delay Which inhibits read
data sampling until the tape has reached a sufficient speed for reliable data transfer.
NOTE
It is possible to deselect a transport without stopping the tape
motion and then reselect the transport at a later time. If this
is the case, the controller does not trigger the up-to-speed delay
and data can be transferred as soon as the transport is reselected.
This capability requires additional program instruction and is

therefore not described in this text.
When CON GO and CON FWD REM go low, they are inverted high by the M531 Bus Converter module

(Drawing BS-TU56-0-TLD, sheet 2) and applied to the Motion L and Direction L flip-flops (Drawing
BS-TU56-O-TLD, sheet 1).

FWD REM and L SELECT are then ANDed at gate M113 pins D2 and E2 to set the

Motion L flip-flop and generate L MOl high. L M01 and L DIRI are then ANDed at gate M1 13 pins P1 and R1.
The low M1 13 pin 81 output is inverted high and applied to the G847 module, applying a +38V run signal to the
forward motor. This action causes the tape to move forward.

Simultaneously, pin N2 of the G847 module goes

low, applying a +18V drag signal to the reverse motor, thus maintaining the proper tape tension while the tape is
in motion.

When the internal up—to-speed delay times out, a controller circuit compares the frequency of the incoming pulses
from the tape timing channel to a one-shot output in the controller. Once the two frequencies match, the tape
has reached a sufficient speed for reliable data transfer and the controller then compares the first incoming block

number from the tape mark channel to the desired block number specified by the command. If the incoming

block number is smaller, forward tape motion continues until the desired block number is reached. At this point,
read or write data is transferred (Paragraphs 3.4.4 and 3.4.5). If the incoming block number is larger, tape motion
must be reversed (turned around) to reach the desired block number. If this is the case, the controller triggers an

internal turnaround delay that inhibits further data reception and complements the CON FWD REM and CON
REV REM interface lines. This action initiates reverse tape motion in a similar manner as the forward tape m0ti0n

just described.
After the internal turnaround delay times out, the block numbers are again compared, as previously described,
until the desired block number is detected. When this occurs, the tape is again turned around (CON FWD REM
and CON REV REM complemented) and once sufficient tape operating speed is acquired, read or write data is
transferred (Paragraphs 3.4.4 and 3.4.5).

3.4.4

Write Operation

The DECtape system of recording is unique in that regardless of whether data is being written on or read from the
data channels, the timing and mark track amplifiers are always reading the information contained in those two
channels.
Once the tape has been properly positioned (Paragraph 3.4.3) and a write operation initiated, the following events
occur.

The alternating positive and negative flux reversals prerecorded in the timing track (TT) produce a nearly

sinusoidal output (Figure 3-5A) at the terminals of the corresponding read coil. The read amplifiers in the con-

troller detect the zero-crossings of this waveform.

Zero-crossings in which the signal changes from a negative to a

positive level generate a train of TPO timing pulses. Positive-to-negative transitions generate a separate train of
/

TPl timing pulses.

Physically, these pulses are generated when the timing track read/ write coils are positioned

between two adjacent flux reversals.
When data bits are being written, each TPO pulse causes three data bits to be loaded into the data buffers in the

controller. The following TPl pulse then automatically complements all three buffers. Each buffer is in direct
control of the write current flowing through the corresponding read/write coil. Thus, depending on the previous
state of a given data buffer, the TPO pulse may or may not cause the data buffer to change state and write a flux

reversalsnihstape; The. .1131 Duluthgwsvsri will. always 9311,55? tbsbuffet to Plunge. statsang write a flux
.

reversal.

The TUS 6 magnetic head has been designed in such a way that flux reversals in the magnetic circuits do not occur

instantaneously, but lag the reversal of the write currents by 6 to l0 microseconds. This delay is necessitated by
the fact that each flux reversal is recorded on tape at a point which is displaced from the center of the write coil
gap (Figure 3-5B). The magnitude of this displacement is about 75 percent of the write coil gap width, and the

direction of the displacement is the same as the direction of tape motion. As a result of this delay, the flux
reversals in the data tracks are positioned between the flux reversals in the timing track.

tape in which the pattern

00778 has been written.

'3-9

Figure 3-5C illustrates a

/‘\

/'\

/\
/\
A
/
\/
V
V

DATA TRACK 0

Read/ Write Waveforms

[READ/WRITE
(ESE
LL» (€553 "U
----

r<—<—4\

\_._.J
FLUX RECORDED
N TAPE

LUV
K._._./{ \
/—>

COIL

GAP

TAPE

—->

MOTION

\—TAPE
FLUX FIELD
BY COIL

INDUCED

POINT AT
WHICH FLUX
REVERSAL Is
WRITTEN

B. Head Flux Recording Location

O
——

POSITIVE

FLUX

REVERSAL
REVERSAL

NEGATIVE

FLUX

REVERSAL

FLUX

CP-OZBS

C. Recorded Tape

Figure 3-5 Read/Write Technique

3-10

3.4.5

Read Operation

When the section of tape shown in Figure 3-5C is read, the relative positions of the timing and data track flux
reversals ensure that the two signals will be read back 90 degrees out of phase.

Therefore, if the tape is read

while moving in the same direction as it was written, (i.e., the tape was written, rewound over the head, and

read), the TPl pulses will occur close to maxima of. the signals from the data tracks.
In order to read the tape, the signals from the data amplifiers are fed to the inputs of the data buffer, and

loaded into the buffer when TPl

occurs.

Figure 3-5A illustrates the timing track, TPO, TPl, and data track 0 signals which are generated when the
section of tape shown in Figure 3-5C is read while moving in the same direction as it was written.
each TPl

pulse

occurs

Note that

at a maximum of the data track signal, and that the polarity of the data track signal

at that time defines the value of the bit that was recorded there.

3.5

MODULE DESCRIPTION

Circuit information for the FLIP CHIP modules used in the TU56 DECtape Transport is cataloged in the DEC

Digital Logic Handbook, C—lOS. Schematics of these and noncataloged modules are contained in Appendix A.
The following paragraphs describe only the noncataloged modules.

3.5.1

G847 Dual Motor Voltage Control

The G847 Dual Motor Voltage Control module (Drawing B-CS-G847-0-1) selects the voltage level that is

applied to the tape reel motors.

This module contains two 3-stage circuits for control of the two reel motors.

Q2 and Q3 are then, in turn, biased on. With Q3 conducting, a
at Eout 1. Diode D4 is then reverse biased following the
+38V)
appears
high output voltage (approximately

When the run signal is high, Q1 is biased on.

higher output voltage.
Diodes D2 and D9 ensure that the potentials at the base of Q3 and the collector of Q2 do not exceed their

design ratings.
When the run signal is low, Q1, Q2, and Q3 are off and D4 conducts; thus, the lower voltage (approximately

+18V) appears at Eout 1. Eout 1 is at +38V during run and brake time and at +18V when drag is required
on a

particular motor. Eout l is also at +18V when the REMOTE/OFF/ LOCAL switch (SW2) is in the OFF

position.
3.5.2

G848 Motor Control Module

The G848 Motor Control module (Dra‘ ring GCSaGS48aO-l) is a
an ac

ransistorized bridge e'rcuit designed to operate

tape reel motor from a dc source. The operational ac is obtained from an external 40-Hz clock oscillator,

whose OSCO and 08C] outputs are 180 degrees out of phase with each other.
The bridge circuit controlling the ac tape motor consists of two PNP transistors (Q5 and Q8) and two NPN
transistors (Q6 and Q7).

The OFF signal can remove power from the motor for an indefinite period.

Transistor turn—on, RC time delay networks (R15 and C4; R24 and C3; R23 and C2; and R3 and Cl)
two opposingarmsin the bridge network from being. biased on at the same time.

off to turn-on is approximately 1 millisecond.

3-ll

prevent

Ihetime delay from turn-

When the OSC1

input is high, Qll is biased on, and C2 discharges through the low impedance path of the

transistor to ground.

When C2 discharges, Q10 turns off.

When C4 has sufficiently discharged through D12,

R15, and Q1 1, Q9 is turned on and provides a path from the motor power supply to the base of Q7, turning

Q7 on.
When the OSC1
causes

input is high, the OSCO input is low, biasing Q2 off. Cl charges through R3, which in turn

Q3 to be turned on. Once Q3 is biased on, it turns Q5 on. Diode D8 is then reverse biased, Q4 is

biased off, and C3 charges through R25.

A current path now exists from the motor power supply, through

Q5, through the motor windings, and through Q7 to ground.
The opposite operational characteristics occur when OSC1

input goes low and OSCO goes high. For this change

of state, Q11, Q9, Q7, Q5, and Q3 are now reverse biased, and Q2, Q4, Q6, Q8, and Q10 are forward biased.
The two halves of the bridge network oscillate at the 40—Hz clock rate, generating ac current through the
motor winding and inducing motor motion.

3.5.3

G859 Clock Regulator Module

The G859 Clock Regulator module (Drawing B-CS—G859-O-1) contains a divide-by-two flip—flop (Q6 and Q7),
an

80—Hz oscillator (Q2 and Q3), and a voltage regulator (Q5).

The 80-Hz oscillator output is fed through

capacitors C3 and C4 to the flip-flop. The resulting 40-Hz square wave output is then connected through two
emitter followers (Q1 and Q4) to the G848 Motor Control module.
NOTE

During tape motion, the high harmonic content of the 40-Hz
square wave that supplies the tape reel motors produces small,
cyclic variations in the power output of the motors. These
variations may cause an audible hum which varies in intensity
as the reel being driven by a particular motor fills with tape.
Such behavior is normal, and has no effect on the performance
of the transport.

When +10V is connected to pin A2 of this module, the +5V regulator circuit reduces this input voltage to the
+5V level required for logic operation.

If +5V is available from an external power supply, the regulator circuit

is bypassed.

3.5.4

G888 Manchester Reader/Writer Module

The 0888 module (Drawing B-CS-G888-0-1) consists of two portions.

The upper read portion of the sche-

matic contains the following:
a.

linear amplifier (El) with a gain of 100

zero-crossing detector (E2)
limiter (Q1)

During a read operation, the 10 to 12 mV read signals from the read head are applied to pins D and E of
linear amplifier E1.

The approximately 1V amplified output (test pin H2) is then transmitted to zero-crossing

detector E2 pin 2.

The square wave E2 output is clamped, by limiter Q1, to the standard DEC logic levels and

applied to output gate E3. The signal at output pins U and V is then transmitted via the interface lines to the
controller read/write buffer.

3-12

The lower write portion of the schematic contains a push-pull amplifier (Q3 and Q5).

During a write opera-

tion, write data from the controller is ANDed with the T/M ENAB signal at input gate E3
13.

pins 9, 10, 12, and

Either output pin J or K, depending upon the polarity of the input signal, drives current to the read/

write heads.

The applicable G888 module specifications are as follows:

Write Amplifier

Inputs:

Standard TTL voltage.
Load at 0V is 1 unit.

R2 should be tied to +3V when not used.

Outputs:

Can drive 100 mA in either direction.
Pins L2 and M2 are the outputs of the 7400 TTL gates.
Pins J2 and K2 are the outputs that drive the tape unit write head.

Read Amplifier

Inputs:

Can detect an input voltage as low as 500 uV.

Outputs:

Pins U and V are standard TTL voltages.

Fan Out:

Pin U2

9 unit loads

Pin V2

10 unit loads

Test Point:
Power Dissipation

Pin H2 is a test point for the first stage output.
50 mW at +5V
250 mW at ~15V

3-13

CHAPTER 4

MAINTENANCE

4.1

RECOMMENDED TOOLS AND TEST EQUIPMENT

Servicing the TU56 DECtape Transport requires the equipment listed in Table 4—1 and standard hand tools,
cleaners, test cables, probes, etc.
Table 4-1

Recommended Maintenance Equipment

630—NA or 260

Multimeter

Triplett or Simpson

Oscilloscope

Tektronix

Series 540,

FLIP CHIP module extender

DEC

W982

Reel Hub Alignment Gauge
Phillips-head screwdrivers

DEC

580, 543 or 544

74-08010
All four standard sizes
‘

Allen wrench set

No. 667

Allen wrench with screwdriver handle

All standard sizes

G500 Skew Test Module

4.2

Model

Manufacturer

Equipment

DEC

PREVENTIVE MAINTENANCE

When the tape transport is operated on a one shift basis in a normal office environment, perform the follow-

ing weekly and monthly preventive maintenance (PM) procedures. An excessively dirty environment or heavy
transport usage may require more frequentperformance of, the weekly PM procedure. Since dust and oxide

particles contribute significantly to read errors, inspect and clean the tape handling surfaces as often as
necessary.

Use only the head cleaning solvent supplied in the DEC head cleaning kit (Potter Cleaning Kit

A425484B). Darin

the cleaning process, do not allow the solvents to come in contact with t e ta

e or

painted surfaces and ensure that all cleaned surfaces are completely dry before loading a tape.
4.2.1

Weekly PM Procedure
1.
2.

Unload all tapes from the transport.
Use a dry, lint-free cloth to remove all lint, dust, and loose oxide from the front mounting panel.
Do not use head cleaning solvent

on any painted-surfaces.

Moisten one of the swabs with head cleaning solvent and clean the oxide from the edges of the tape

guides and abutting surfaces. Once a swab has contacted a dirty surface, do not remoisten the swab
in such a way as to contaminate the cleaning solvent in the container.

(continued on next page)

If necessary, use a pointed wooden dowel that has been soaked in cleaning solvent to remove very
old, hard oxide deposits from the edges of the tape guides.
Clean the tape guide path and the top of the read/ write head with a clean, lint-free cloth moistened
with head cleaning solvent.

Using a dry, lint—free cloth, wipe the excess cleaning solvent from the read/write head and tape guides.
Allow at least 60 seconds for the remaining solvent to evaporate, then reload the tapes.
Check for proper operation of the reel motors and electronic brakes by momentarily pushing the
Forward ( —>) and Reverse (4—) tape motion switches and observing that the tape moves in the

corresponding direction. If the tape does not stop smoothly, adjust the electronic brake (Paragraph
4.3.2.4).

Monthly PM Procedure

4.2.2

If the tape transport is operated on a standard eight hour shift, perform the following procedure once a month.
If the transport daily operation exceeds one shift, perform the following procedure more often.

Stagger the

monthly checkout for individual transports evenly throughout each month.
1.

Clean the exterior and interior of the cabinet with a vacuum cleaner and clean cloths moistened, if
necessary, in a nonflammable solvent. DO NOT USE SOLVENTS THAT WILL REMOVE PAINT.

Clean the air filters at the top or bottom of the equipment rack as described in the preventive maintenance section of the

appropriate controller maintenance manual.

Clean the most frequently used tapes by placing a clean, dry, lint-free cloth over the read/ write head,

loading the tape on the transport and manually running the tapes over the cloth.
Clean the take-up reels, if heavy use has caused oxide build-up around the hub.

Inspect the over-all condition of the transport.
Inspect the cable and logic modules to ensure that the modules are securely seated in the logic
mounting block.
Exercise both the transport and the associated controller in all possible modes and directions.

AppliLog

cable programs for these operations are listed in the appropriate controller maintenance manual.
all errors to provide a malfunction history as an aid in troubleshooting.

Interchange tapes among all transports and use the maintenance program read routines to ensure that
all transports can read tapes generated by other transports. lf Step 7 was performed satisfactorily, any
malfunctions that occur during this step are probably due to head skew. Measure the head skew
(Paragraph 4.3.3.4) and if it is not within specifications, consult a DEC field service engineer. (Transports with misaligned heads must be realigned by a qualified DEC field service engineer.)
4.2.3

Tape Care and Cleaning

To obtain maximum longevity and efficiency from DECtapes, observe the following precautions and practices:
a.

Store the tapes where the temperature and relative humidity do not exceed 40 to 90°F and 20 to 80%

humidity.
Since strong magnetic fields can distort or destroy the flux reversals on the tape, protect the tape from
exposure to magnets or electrical coils.

Do not allow cleaning fluids to contact the DECtape or painted surfaces.

(continued on next page)

Periodically clean the tapes by placing a clean, dry, lint-free cloth over the read/ write head and then
running the tape over the cloth.
Do not use adhesive-backed tape to start the DECtape on the take—up reel. In time, this practice

accelerates oxide buildup on the hub and results in uneven tape packing on the take-up reel.

4.3

CORRECTIVE MAINTENANCE
Control Panel Lamp Replacement

4.3.1

Before performing this procedure, note the position of all burned—out indicators.
1.

Remove power from the transport.

Turn the mounting panel side-locking fasteners one-quarter turn to unlock the mounting panel.

Carefully lower the mounting panel until the support struts are fully extended (Figure 4-1).

Remove the backing plate from the control panel logic module by removing the two Phillips-head
screws.

Remove the four Phillips-head "crews from the control panel logic module and lift the “nodule fr"e

from the mounting panel.
Unsolder and replace all burned-out indicators.
Reassemble the transport and restore power.

Reel Motor

4.3.2

4.3.2.1

Motor Removal

Remove power from the transport.

Remove the tape reel from the hub.

Loosen the two hub Allen screws and slide the hub off the shaft.

Turn the mounting panel side-locking fasteners one-quarter turn to unlock the mounting panel.

Carefully lower the mounting panel until the support struts are fully extended (Figure 4-1).

Unplug the reel motor cable connector by pressing the locking tabs that extend from one of the
Mate-N-Lok connectors against the side of the connector body and separating the connector halves.
.

,v-

NOTE
If the reel motor connectors are held to the chassis by a nylon

cable holder, remove the top of the holder and free the cable.

Remove the four screws securing the reel motor to the mounting panel and lift the motor and friction

bushings free from the mounting panel.

4—3

31%.“.

s..a..\\»w

~-.fl»~~\~~

REEL MOTOR

CONNECTORS

SUPPORT
STRUT

HEAD

COLLAR

BACKING PLATES

Figure 4-1 Reel Motor Removal

4.3.2.2

Motor Replacement

Inspect the friction bushings (P/N 12—09926) and spring (P/N 12-09917), and replace them if necessary.
Slide the friction bushings and spring onto the motor shaft, ensuring that the bottom tip of the spring
is properly seated between the wings of the C-ring retaining the motor bearing.

Insert the reel motor shaft through the opening in the mounting panel (Figure 4-1) and attach the
motor with the previously removed hardware.

Reconnect the reel motor cable connector.

(continued on next page)

4-4

9‘?"
:J

Close and lock the mounting panel.

Slide the reel hub onto the motor shaft and lightly tighten the hub Allen screws.
Perform the hub clearance adjustment (Paragraph 4.3.2.3).
Restore the transport power and perform the electronic brake adjustment (Paragraph 4.3.2.4).

4.3.2.3
1.

Reel Hub Clearance Adjustment
With the hub gauge (P/N 74—08010), check for .017 inch clearance between the tape reel hub and the

flange on the mounting panel (Figure 4-2).
If the clearance is incorrect, loosen the Allen screws on the hub and make the necessary adjustment.

Retighten the Allen screws.
NOTE
Do not repeatedly loosen or tighten the hub Allen screws.

These screws are serrated cup type and may become damaged
with excessive use.

4.3.2.4

Reel Motor Electronic Brake Adjustment
Load a tape on the transport to be tested.
Set the REMOTE/OFF/LOCAL switch to LOCAL.
Press and hold the Forward (—>) tape motion switch. When the tape is up—to—speed, release the switch
and observe that the tape braking action is smooth without overshoot. If tape motion stops, then
reverses

slightly when the switch is released, the braking time is too long. If the tape coasts, the braking

time is too short.
If necessary, adjust the top R2 (left transport) or bottom R13 (right transport) potentiometer on the

M302 module to obtain the correct brake indications.

4.3.2.5

40-Hz Oscillator Adjustment

If, during remote turnaround operations, consistent mark track or read errors occur, check and adjust the 40-Hz
oscillator output in the following manner. Connect an oscilloscope to A03M2 or A03N2 and, if necessary, adjust
R2 of the G859 module to obtain a 25—millisecond (40-Hz) square wave.
‘

4.3.3

Read/write Head

4.3.3.1

Head Removal

Remove power from the transport.

Remove the tape reels from the hubs.

9‘95“!”

Turn the mounting panel side-locking fasteners one-quarter turn to unlock the mounting panel.

Carefully lower the mounting panel until the support struts are fully extended.
Disconnect the 22-pin Amphenol head cable connector from the rear of the G851 Relay module

(Figure 43).
Route the Amphenol connector and cables from the rear to the front of the transport.

Remove the backing plate from the control panel logic module by removing the two Phillips-head
screws

(Figure 4-1).
(continued on next page)
4—5

.Jl/
/\
.017
HUB

CLEARANCE

MOUNTING
PANEL

MOTOR
SHAFT

10-0178

Figure 4-2 Reel Hub Clearance

Remove the two head screws through the access holes in the control panel logic module.

Pull the head away from the mounting panel and remove the head collar by pushing on the back of the
collar to break the adhesive bond, then lifting the collar free from the front of the mounting panel.

10.

Thread the head cables through the mounting panel. Turn the Amphenol connector sideways and push
it through the hole in the mounting panel.

4—6

4.3.3.2
1.

Head Replacement

Clean the new head mounting face and the mounting area on the transport mounting panel with a
clean lint-free cloth moistened with head cleaning solvent.
NOTE
To ensure proper head alignment, the mating area of the head

and mounting panel must be entirely free from foreign matter.
Turn the 22-pin Amphenol head cable connector sideways and insert it through the hole in the mounting

panel front.
Install the head on the mounting panel with the previously removed hardware and ensure that the head

retaining screws are tightened securely.
Route the Amphenol connector and cables frOm the front to the rear of the transport and plug the connector into the rear of the G851

Relay module (Figure 4—3).

Open and close the mounting panel and ensure that the head cables do not chafe or bind.
Replace the backing plate on the control panel logic module (Figure 4—1) with the previously removed
hardware.
Restore power to the transport and perform the head skew check and adjustment (Paragraph 4.3.4.4).

Close and lock the mounting panel.
Refasten the head collar to the mounting panel and remount the tape reels on the hubs.

4.3.3.3

Head Output Check

To accomplish this check procedure, a single-channel oscilloscope with a high-gain differential preamplifier

(Tektronix type D plug—in) capable of handling millivolt signals over a 0- to 60-kHz bandwidth is required. If the
heads have been replaced or if consistent read errors indicate that the heads are not operating satisfactorily, clean
the heads and perform the following:

Load a DECtape on the transport to be tested.

Manually run the tape forward until each reel contains approximately one-half of the tape.
Disconnect the 22-pin Amphenol head cable connector from the rear of the G851 Relay module

(Figure 4-3).
Set the oscilloscope controls as follows:
0

sweep time

vertical sensitivity

trigger

10 its/div
=

0.2 mV/div (if X10 probes)
auto internal

Attach the scope probes to pins B and C, (Figure 4-3, insert) and the ground clip to pin D of the head
connector.

Press the Forward (—v) or Reverse (<—) tape motion switch and observe the scope display for an

approximate 10- to 12—mV peak-to-peak waveform.
f]

Repeat Step 5, attaching the scope probes to pins F-H, P—R, U—V, and Y—Z. These signals may not appear
sinusoidal (as they do for pins B-C), but the peak-to—peak amplitude should be 10 to 12 mV. If this is
not the case, replace— the head (Paragraph 4.3.3.1). (Only a qualified DEC field service engineer can
replace the heads in the field.)

4-7

6851
RELAY
MODULES

AMPHENOL
HEAD
CONNECTORS

Figure 4—3 Head Connector Location

4.3.3.4

Head Skew Check and Adjustment

—

Perform the following check whenever an individual transport

cannot read tapes that were generated by several other transports without an unusual number of read errors. To

accomplish this check procedure, a dual-channel oscilloscope and a special G500 Skew Test module are required.
1.

Load a new (unformatted) or blank tape on the transport to be tested.

Format the tape using one of the applicable DECtape formatting routines.

Remove and interchange the reels so that the full reel is on the right hub.

Reverse the tape so that the oxide side is up by threading the tape directly from the bottom of the right

full reel onto the top of the left empty reel. Do not thread the tape over the heads.
Set the transport to LOCAL and rewind the tape onto the left reel.
NOTE
To maintain tape tension during the rewind operation, apply

light hand retarding friction to the right tape reel.
Thread the tape, oxide side up, in the normal manner onto the right reel and run the tape forward until
each reel contains approximately one-half of the tape.

(continued on next page)

Configure the G500 Skew Test module as follows (all switches NC.
$2

—

down, N0.

up):

Selects the read/ write split coil winding. Use the up position for heads manufactured by

Brush or Applied Magnetics; use the down position for Western Magnetic or General Instrument
heads. (If this switch is in the wrong position, the read signal at terminal SIGl of the skew tester
will have twice the amplitude of the signal at terminal SIG2.)
b.

—

Selects the input voltage. If the supply voltage at TBl on the rear of the power supply is

+10 Vdc, use the up position; if it is +5 Vdc, use the down position. (Use the down position for
M series transports and the up position for R series.)

Plug the skew test module into any available logic block slot except slots 03, 04, or 18.
Disconnect the 22-pin Amphenol head cable connector from the rear of the G851

Relay module

(Figure 4—3) and connect it to the skew tester module, ensuring that the head connector key is

positioned relative to pin A as illustrated in Figure 4-4.

HEAD CONNECTOR

CP- 0288

Figure 4-4 Skew Tester to Head Cable Connection

10.

Set the oscilloscope controls as follows:
0

sweep time

vertical sensitivity

trigger mode
trigger source

AC LF reject, internal

channelA

trigger slope
preamplifier

negative

add

O
0

ll.

10 its/div
l to 5V/ div (depending on signal amplitude), calibrated

Attach the A channel scope probe to terminal SIGl of the skew tester and the B channel probe to
terminal SIG2.

12.

Set the test module switch 81 up and, while running the tape forward over the head, adjust the 10 k9

potentiometer on the skew tester for the smallest signal.
13.

Reset the scope mode switch to ALT and ensure that both signals have approximately the same ampli—
tude and that the zero crossings occur simultaneously.

(continued on next page)

4—9

Run the tape forward over the head and check for less than a 2-microsecond (one-half the displayed

14.

time) skew reading as indicated in Figure 4-5. Ensure that this measurement is taken as near the
tape length center as possible and that the scope is triggered from only one channel. For best transport
operation, head skew readings should be as close to zero as possible; however, skew readings greater
than 2 microseconds indicate that the head must be realigned.
If the correck skew reading is not obtained,'remove the head (Paragraph 4.3.3.1), thoroughly clean the

15.

entire head and the head mounting surface on the transport mounting panel with a clean lint-free cloth
moistened with head cleaning solvent.

Replace the head and recheck the skew. If the skew reading is still incorrect, align the head as follows.

16.

Use extreme care when performing Steps a through d. If care isnot taken the heads may become so

badly misaligned that it is impossible to distinguish a head with zero skew from one with a skew equal
to the interbit distance of the timing track.
Move the tape forward, oxide side up, over the head and determine whether SIGl leads or lags

SIG2.
b.

If SIGl occurs before (leads) SIGZ, remove the head and add 0.5 mil (1 inch long by 0.1 inch

wide) shims between the left side of the head and the mounting panel. If SIGl occurs after (lags)

SIG2, add the 0.5 mil shims to the right side of the head.
NOTE

It is a general practice to use 3M reflective tape strips as head
shims.

Always insert the shim close to the edge of the head.

Never use more than three shims per side. If more than three
shims are required, the shims are being placed on the wrong
side of the head or the transport has other malfunctions.
c.

Repeat Steps 1 through 15 to recheck the skew reading after shimming.

Using one of the DEC exerciser routines, read a known good tape that was generated by another
transport. If the head skew is less than 2 microseconds after shimming and the transport is able
to read a known good tape without errors, the head has been adjusted correctly. (After head
alignment, some of the customers old tapes may become unreadable.)

“i
TRACK "”0

llll
||Illlll
lllllll
|I||II|

llllllll
{III

[IIII!

\ SWEEP TlME= 5ns/DlV

(SIG!)-\)’//

VERT

Q’QTRACK

[Il’llll
iiir

No.1

SENS =0.5V/D|V

(SIGZ)

llll

Illl|lll

Illl

lillllll

//;

47, i

J *4us

‘-

9(-

Zero

crossing

Actual

time

equals twice the skew time.
best transport operation,
as close to zero as possrble.

skew =2,us. For

head skew should be

““02“,

Figure 4-5 Head Skew Waveform
4—10

Write Enable Circuit Check

4.3.3.5

Set the WRITE ENABLE/WRITE LOCK switch to WRITE ENABLE and ensure that the WRITE

indicator lights.

Check for a ground signal at A06 pin 51 (left transport) or A07 pin 31 (right transport) when the

transport is selected.
Set the WRITE ENABLE/WRITE LOCK switch to WRITE LOCK and ensure that the WRITE indicator
goes off.
AA/

CheCk for ‘3 ‘3‘! 53331 331150 Pin Si or A07 pin Si.

4.4

TROUBLESHOOTING

Tables 4—2 (Reel Motor Malfunctions), 4-3 (Control Panel Malfunctions), 4—4 (Logical Malfunctious), and Figure
4-6 list trouble indications and corrective check areas for specific portions of the transport. These tables are
intended to be used as a guide during trouble analysis and by no means do they cover all possible malfunctions

of the designated areas. When a transport malfunction occurs, perform the initial checks (Paragraph 4.4.1) before

proceeding to the tables.
4.4.1

Initial Checks
1.

Measure the ac line voltage to ensure that it is the correct value as indicated on the H725 Power
Supply label (Drawing C-CS—725-0-l).

Meaure all the dc voltages at TBl on the rear of the H725 Power Supply. Ensure that either +10 or
+5 Vdc, but not both, is connected to the correct TBl terminal.

Ensure that the connections between the transport and the power supply are tight.

Ensure that all logic modules are securely seated in the logic block.

Ensure that the reel motor cable connectors (Figure 4-2) are tight.

Table 4-2
Reel Motor Malfunctions

Trouble Indications

Malfunction

Check

Motel-“sac not run in LOCAL or

No high or low motor drive

REMOTE.

voltage.

Motors turn freely by hand.

Oscillator not operating.

A03 (G859) module.

N0 drag on motors in LOCAL

No low motor drive voltage.

5A fuse.

No high motor drive voltage.

6A fuse.

Oscillator locked.

A03 (G859) module.

3A SB fuse.

or REMOTE Hold.

Motors have drag but do not
move

tape in Fwd or Rev

LOCAL.
Motors do not run in LOCAL

orREMOTE.

Motors do not

turn freely by hand.

(continued; on next page)

4—11

Table 4-2 (Cont)
Reel Motor Malfunctions

Trouble Indications

Check

Malfunction

5A fuse on B03 or B18 (G847)

Tape moves in one direction in
Hold. Tape moves in either Fwd
or Rev LOCAL, but not both.

No drive voltage to one motor.

Tape does not move in Hold,

Motor control module not receiv-

Output of B03 or B18 (G847) mod—

nor Fwd or

ing high drive voltage.

ules.

Rev LOCAL.

modules.

Tape moves but speed, accel-

Motor not receiving proper wave—

Output of AB01 AB02, AB19,

eration, or smoothness is ab—

shape.

AB20 (G848) modules.

normal.

Table 4-3
Control Panel Malfunctions

Trouble Indications

Check

Malfunction

WRITE indicator does not light

No —15V at indicator module.

in WRITE ENABLE.

Lamp burned out.

Both transport REMOTE

No +5V to indicator module.

B04 or 1317 (M922)

modules.

Output of A03 (G859) module and

SELECT indicators remain lit

+5V terminal at rear of power

in any position of the REMOTE/

supply.

LOCAL switch.
Address Select switch does not

Select code not being received.

REMOTE/ LOCAL and Fwd/
Hold/ Rev switches have no

For —3V signal at faulty switch position or erroneous controller output.

select in one or more positions.
No +5V at indicator module.

B04 or B17 (M922) modules for
+5V.

affect. Motors run at all times.

Table 4-4

Logical Malfunctions
Trouble Indications

Malfunction

Check

No M01 signal.

B07 or A16 (M1 17) modules.

Tape moves in only one direction.

No DIRl or DIRO signal.

B05 or B16 (M113) modules.

Tape does not stop in normal
time, seems to coast to a stop.

N0 BRAKE signal. (Brake time

Reel motor electronic brake (Para-

is less than 80 ms.)

graph 4.3.2.4).

Tape reverses after stopping.

BRAKE signal too long.

Tape does not move in either
direction.

Reel motor electronic brake (Para-

graph 4.3.2.4).
No remote control.

I/O signal not received.

Level converter (M531, W513, or

M941) modules required for interface with controller.

I/O signal not sent.

Controller output.

(continued on page 4-14)

SWEEP TIME = Sms/ DIV
VERT

SWEEP

SWEEP TIME = Sms/DIV
VERT. SENS. = 5V/Dlv

SENS.=10V/ DIV

TIME = 5ms/DIV

VERT. SENS.= SV/ DIV

(I) a

Q5 and Q6 (top), Q7 and Q8 (bottom), Collector Voltage

Q9 Collector Voltage

SWEEP TIME = 5ms/DIV
VERT. SENS. = 0.5V/ DIV

Q9 Emitter to Base Voltage

Q7 Emitter to Base Voltage

SWEEP TIME =5ms/DIV
VERT. SENS.=O.5V/ DIV

Q8 Emitter to Base Voltage

Q10 Collector Voltage

SWEEP TIME =5ms/DIV

VERT. SENS.=O.5V/D|V

Q1 1 Emitter to Base Voltage

SWEEP TIME =5ms/DIV

SWEEP TIME =5ms/DIV
VERT. SENS. =O.5V/D|V

QlO Emitter to Base Voltage

VERT.

Qll Collector Voltage

SENS. = SV/DIV

SWEEP TIME=5ms/DIV
VERT SENS.=IOV/DIV

Voltage

SWEEP TIME =5ms/DIV
VERT. SENS. = 5V/DIV

SWEEP TIME = 5ms/DIV

VERT. SENS.= SV/ DIV

VERT. SENS.= 5V/ DIV

Reel Motor Drag Voltage

Q10 Collector Voltage

Q9 Collector Voltage

WIN mummm|miflh‘

SWEEP TIME = 5ms/DIV
VERT. SENS. =0.5V/ DIV

SWEEP TIME = 5ms/DIV
VERT. SENS. = 0.5V/ DIV

Q9 Emitter to Base Voltage

SWEEP TIME =5ms/DIV
VERT. SENS. = 0.5V/ DIV

SWEEP TIME

SWEEP TIME= 5ms/ DIV

5ms/DIV

VERT. SENS. = 20V/ DIV

Reel Motor Capacitor Voltage

Qll Emitter to Base Voltage

SWEEP TIME =5ms/DIV

SWEEP TIME =5ms/DIV
VERT. SENS. = 0.5V/DIV

Q10 Emitter to Base Voltage

VERT. SENS.= 0.5V/ DIV

VERT. SENS. = 5V/DIV

Ql l Collector Voltage

Figure 4-6 G848 Motor Control Module Waveforms

4—13

Table 4-4 (Cont)

Logical Malfunctions
Malfunction

Trouble Indications

SELECT ECHO incorrect.

Select Error

Check
A08 or A15 (M040) modules and the
lOO-SZ resistors on pin side of connectors A06 or A07.

WRITE ECHO incorrect.

ControIL panel
switch configuration.
y

Select code error.

Table 4-3, Control Panel Malfunctions.

Transport does not read or write

Data signals not received.

AB09 0r AB12 (G851) modules.

Data signals not sent.

Controller output.

Data synchronization incorrect.

Head and tape guides for tightness,

data.

Numerous mark, timing, and/or

parity errors.

wear

plates for spring tension, con-

dition and cleanliness of tapes and

tape handling assemblies. Head skew
(Paragraph 4.3.3.4).

4.4.2

Signal Source and Termination Tests

As a maintenance aid during trouble analysis, each TU56 Trans P‘ort is supplied with a BC02X-3 test cable
attached to an M908 Connector module. In order to monitor the signals listed in Tables 4-5, 4-6, and 4-7, connect the BC02X-3 cable to the rear of the M941

Jumper modules in logic panel locations A04 or Al8. Test

points are now available at the free M908 module end (Figure 4-7) of the cable.
To monitor the transport primary signals at their origin (source test) connect the test cable to the M941 module

in location A18 and perform the tests outlined in Table 4-5 (left transport) or Table 4-6 (right transport).

When

measuring these signals, always connect the oscilloscope ground to point C2 of the M908 module. If the source
tests do not indicate a malfunction, connect the test cable to the rear of the M941 module in location A04 and

monitor the signals at the power module inputs (termination tests) as outlined in Table 4-7. The table headings
are

defined as follows:
0

Signal

name of

Test Point

M908 test point.

Wire Color

Source

Switch Setting

Modules and location

color of wire connected to M908 test point.
logic location where test signal is monitored.
position of control panel switches for test.
logic modules effecting test signal.

signal being tested.

4—14

SPLIT
A2

LUGS

v2
\

\
——'foooooooooooooooooo

2"3'05

scoex—s
CABLE

_—_.>

TO A18 OR A04

M908

TU56

”1"qmr

L—Voooooooooooooooooo
v1

10-0533

Figure 4-7 M908 Module Layout

Table 4-5
Left Transport Source Test Points
Test
S'’3'” 1

L MOl

L DIR}

Wire

Source

Point

Color

(ruse)

Vio

B07-E1

blu

S W‘t C h S e tt'1ng

BO7-Ll

Modules and

L Ogle Leve 1

Locations

->LOCAL/<-LOCAL
Hold*/REMOTE

high

M1 17-B07

low

Ml 13—306

->LOCAL

high

Ml 17-BO7

<-LOCAL/ REMOTE

low

M l 1 3-B06

Hold*

change

L SELECT

B05-N2

without REMOTE selection

low

Ml 13-305

L FWD LOCAL

yel

B04-Ml

-+LOCAL

low

control

<-LOCAL/Hold*/REMOTE

high

panel

L REV LOCAL

L HOLD
a

orn

Fl
,

L WRT ENAB

L REMOTE

BO4-Kl

red

B04-Pl

brn

BO4—A1

blk

BOS-SZ

6-LOCAL

10W

control

->LOCAL/Hold* / REMOTE

high

panel

Hold*

low

control

*LQCAL/fLQCAL/REMQTE/QEE.. high“,

panel

WRITE ENABLE

high

control

WRITE LOCK

low

panel

REMOTE

high

M1 13-305

LOCAL/OFF

low

*Hold is the center switch position between -> and <-

4-15

Table 4-6

Right Transport Source Test Points
Test
S'1g na 1

R M01

R DIRl

Wire

Source

Point

Color

(TU5 6)

wht

A16-E1

gry

A16-P2

S W1't c h S e tt'111°
D

Modules and

Logic Leve 1

Locations

->LOCAL/ <-LOCAL
Hold* / REMOTE

high

M1 17-A16

low

M1 13-BO6

->LOCAL

high

M1 13-B06

<—LOCAL/ REMOTE

low

M1 1 7-Al 6

Hold*

Change

R SELECT

Vio

B16-N2

without REMOTE selection

10w

M1 13-B16

R FWD LOCAL

blu

B17-M1

->LOCAL

low

control

<-LOCAL/Hold* / REMOTE

high

panel

->LOCAL

low

control

<—LOCAL/Hold*/ REMOTE

high

panel

Hold*

low

control

R REV LOCAL

R HOLD

R WRT ENAB

R REMOTE

grn

yel

orn

brn

B17—Kl

B17—P1

B17-A1

B16-S2

->LOCAL/ <—LOCAL/REMOTE/OFF high

panel

WRITE ENABLE

high

control

WRITE LOCK

low

panel

REMOTE

high

M1 13—B16

LOCAL/OFF

low

*Hold is the center switch position between -> and ‘-

Table 4-7

Right and Left Transport Termination Test Points
5'1g n 3 1

Test

Wire

Source

Point

Color

(TUS6)

Swit c h S e tt'lngs

L0 glc Leve 1

Modules and
Locations

vio

ADS—A2

NONE

+5 1 0.5 Vdc

G859—A03

—15

blu

A03-B2

NONE

—15 i 1.5 Vdc

Power

Slipply
OSC 1 (left)

grn

BOl-S2

NONE

OSC 0 (left)

yel

B01-D2

NONE

050 1 (right)

orn

1320-32

NONE

030 0 (right)

red

B20-D2

NONE

L OFF

brn

B01-R2

OFF

high

REMOTE/ LOCAL

low

OFF

high

REMOTE/ LOCAL

low

->LOCAL/<-LOCAL
REMOTE/Hold*

high

R OFF

L MOI

blk

wht

B20—R2

BOS-Pl

40 H Z
5 qua”

G859
A03

wave

Ml 13-B05

M1 13-B16

10w

(continued on next page)

4-16

Table 4~7 (Cont)

Right and Left Transport Termination Test Points
S'‘gna l

Test

Wire

Source

Point

Color

(TU56)

gry

Bl6—Pl

R M01

S W1't Ch S ettmgs

Log“: Level

<-LOCAL/->LOCAL
REMOTE/Hold*

high

Modules and
Locations

low

L SELCODE

vio

BOS-U'Z

REMOTE and selected

high

R SELCODE

blu

'Bi6-UZ

REMOTE and selected

high

L RUN FWD

grn

BOS-Kl

->LOCAL

high

Ml l3-B05

<-LOCAL/ REMOTE/ Hold

low

M1 1 7-B07

Release from <-LOCAL

high***

«LOCAL

high

Ml l3-B05

->LOCAL/ REMOTE/ Hold

low

M1 1 7-B07

Release from ->LOCAL

high***

L RUN 2 REV

R RUN FWD

R RUN 2 REV

yel

orn

brn

BOS-K2

Bl6-Kl

B16—K2

(-LOCAL

high

Ml 13-305

->LOCAL/ REMOTE/ Hold

low

M1 1 7—BO7

Release from ->LOCAL

high***

->LOCAL

high

Ml l3-BOS

<-LOCAL/REMOTE/ Hold

low

M l l7—B07

Release from <—LOCAL
*Hold is the switch position between -> and <-.
=““‘Module depends on controller type.

***High for 80 to 90 ms.

Controller Input Test Points
The following input signals from the controller are also available on this cable.

STOP

yel

A04—D2

Controller GO

red

A04-F2

Controller STOP

REV REM

blk

A04—JZ

Controller REV REM

‘

FWD REM

grY

Ablt-L2 Corleone} FlVD REM

ALL HALT

blu

A04-N2

Controller ALL HALT

SELCODE

yel

A04—R2

Transport Selected

*Voltage level depends on controller type.

4-17

4.5

RECOMMENDED SPARE PARTS

One of each of the modules listed in Table 4-8, plus three pica fuses (Part No. 1205747), should be retained at
the site as backup spares.

Table 4-8
Recommended Spare Parts

Name

Module

M531

Bus Converter

M040

Solenoid Driver

G851

M302

Relay
6-4 Input NAND Gate
10—2 Input NAND Gate
Dual Delay MV

G848

Motor Control

M908

Connector

W032

Cable Connector

G888 Option*

Manchester Reader/Writer

M922

Cable Connector

M923 Opti0n*

Cable Connector

G847

Dual Motor Voltage Control

M1 17
M1 13

*Refer to Paragraph 1.3.

4—18

APPENDIX A

REFERENCE DRAWINGS

Title

Drawing No.

Rev

Page

TU56 Assembly

E-UA-TU56—0-0

A-3

Transport Logic Diagram

D-BS-TU56-0-TLD

A-7

Module Utilization

D-MU—TU56-0-MU

A—ll

Wired Assy TUS 6

D—AD-700632l—0-0

A—l 3

Motor Control G848

D-CS—G848-0-l

A—l 5

Dual Motor Voltage Control G847

B-CS-G847-O-l

A-l 7

Relay G851
Clock and Regulator G859
Manchester Reader/Writer G888

B-CS—G851—0-1

A-l 7

B-CS-GSS9-O—l

A-18

B—CS—G888-0—l

Solenoid Driver M040

B-CS-M040-0-l

A-l9

One Shot Delay M302

B-CS-M302-0-l

A-l9

10-2 Input Nand Gates M1 13

B-CS-Ml 13-0-1

A—20

6-4 Input Nand Gates M1 17

B-CS-Ml 17-0-1

A-20

Negative Bus Converter M531

C—CS-M53 1-0-1

A—21

Connector Module M908

B-CS-M908-0-1

Connector W032

B—CS-WO3 2-0-1

Level Amplifier W513

B-CS-W513-0-l

A-23

Blank Module W990

B-CS-W990-O—l

A—23

Power Supply 725

C-CS—M53 1-0-1

A-24

A-22
A-22

SCPEWDRIVER SLOT MUST BE VERTICAL TO INSURE
PROPER LOCKING WHEN NO,I IS IN CLOSED
POSITION.

2
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NO.|

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WHEN DOUBLE UNIT

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DEC-OO-HRTC-D

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