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Document:	PRS01 Maintenance Manual
Order Number:	EK-PRS01-MM
Revision:
Pages:	40
Original Filename:	PRS01%20Maintenance%20Manual.tif

OCR Text

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EK-PRS01-MM-002

PRSO1 Paper Tape Reader
Maintenance Manual

UNIT ?‘75’{5 af | S gg-}cfi ol ffii&?fififi‘% 33; 5“7# ;y§
SUB UNIT

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SERIAL NO

¢ s mev | TETCH

&
SeshanasRie

digital equipment corporation - maynard, massachusetts

1st Edition, May 1977
2nd Edition, April 1978

purposes and is subject to change without notice.
Digital Equipment Corporation assumes no respon-

sibility for any errors which may appear in this
manual.

Printed in U.S.A.

This document was set on DIGITAL’'S DECset-BOOO
computerized typesetting system.

he following are trademarks of Digital Equipment

Corporation, Maynard, Massachusetts:

DEC

DECtape

PDP

DECCOMM

DECUS

RSTS

DECsystem-10

DIGITAL

TYPESET-8

DECSYSTEM-20

MASSBUS

TYPESET-11
UNIBUS

CONTENTS

Page

CHAPTER 1

INTRODUCTION

1.1

DESCRIPTION ...ttt
et s e s bt e s be s st s s s bb e s s ebbe s sabeesanessabassnbsesabae e 1-1

1.2

1S 0510
= =TSR 1-2

1.3

SHIPPING LIST ...ttt
ettt st e s bt e e be s s s aae s sbeessabeesnaeessaessasesreeons 1-2

1.4

SPECIFICATIONS. ... .ottt
b e s s et e st e s et e s ssbb e s s b e e esebeessteesaressnreens 1-2

1.5

MAINTENANCGE. ... .ot
e ser e s a bt e e s be e s st e e s sbea e s esbeessstasessseassrseessrrees 1-4

CHAPTER 2

REPACKING

2.1

INTRODUCGTION......oo ottt
et sttt ear e san s se 2-1

2.2

REPACKING ... ...ttt
et s ba e s e s bb e e s tb e e s sabeee s e b bessssnssesabessnresesans 2-1

CHAPTER 3

OPERATION

3.1

7040
1 o ST
RRR 3-1

3.2

NORMAL OPERATION ...ttt
ettt s ssts st s ssate e sab e s sbtessatessens e e sebeesssesabas ons 3-1

3.3

LOADING PAPER TAPE........oo

CHAPTER 4

INSTALLATION

oottt

ettt tts sttt tts st s ats s s ba s snss e srsessbaassbaaebassarees 3-2

4.1

INTRODUGTION. ... oottt
sb e et b e e b s et r e btsebesssabesssnbessbbsssseesssessnnenen 4-1

4.2

CABLING INFORMATION.....ottt
ettt sate s st s s b s seatae s st e s senanasssbneesreassnans 4-1

4.3

INSTALLATION ..ottt
sttt et seb s b e s sabe s st e e s bt s e s bsesabesssbeesabeesabessaresseaen 4-4

4.4

CHECKOUT PROCEDURE .......oootie ittt sttt s s eatesbe s s b e st e s sstb e sar e s snbessabassasseans 4-4

CHAPTER 5

TROUBLESHOOTING AND REPAIR

5.1

INTRODUCGTION.... .ottt
bttt st ssb e s s bt s s bt e sats e sbsessabessabsesssbeesssessnessnnrees 5-1

5.2

IDENTIFYING PROBLEMS.......co ottt
ettt ettt st s st e s st n e s sabesesbaesesbasssnben s 5-1

5.2.1

Diagnostic Program for PDP-8.............o sttt
ve e 5-2

5.2.2

Diagnostic Program for PDP-11 ...ttt 5-2

5.2.3

5.3

5] 2= g Lo BY AN oY o T3V E 1 =T 1 o [T 5-5
EXTERNAL TROUBLESHOOTING........ooiiiiiiitieceie ettt

s bassssars s snr s e D-8

5.3.1

Basic Volt/Ohmmeter CheCkKS............ccuvvviiiiiiiiic

5.3.2

20 MA CIrCUIT TOSTS ...c.vveeiiieicceee ettt
sbe s s sab e s e ebb e s e stbessssbeseanssesnnanen 5-10

5.3.3

=T
Lo LT O] ot U

5.4

5.4.1

ettt 5-8

I =T £ SRR 5-11

INTERNAL TROUBLESHOOTING ..ottt

tesee e ee e s etaneseees e esanssaeessssasnasssanasens 5-12

Tape Path Problems............ ittt
aa e 5-13

Page

54.2

IVLOTOT ...t
ettt e st e et e e teeeatesteeseteesseesseeesteesesesaseenees 5-14

5.4.3

TR ANSTOIMIT ...ttt
ettt ettt et e et e et e e te e teseresteeeasreaeeareans 5-14

544

HEAA ...ttt
e e ettt e et e et et e st e r e et eeearenaen, 5-14

5.4.5

LOGIC MOAUIE ...ttt
et e et e et e sereesreeeaeens 5-15

APPENDIX A

JUMPER/SWITCH CONFIGURATIONS

FIGURES

Figure No.
1-1

Title

Page

PRSOT Paper Tape REAUET ..........ooviieeiieeiceeeeee
ettt et e s eeesereser e e e e e eeeetseeseeeaeas 1-1

2-1

Repacking PRSOT Reader............ccoooiiiiiiiiicec
ettt
s e, e ———————— 2-2

3-1

IoT:To [1aTe I og-T o 1T g IF-T o1 TSRO
SUSSRUURPI 3-3

4-1

Reader INterconneCting Cables ...........c..coviiiiiiiiiiieee

4-2

PRSOT Schematic Di@gram..........cccoooiiiiiiiciiceicecee
ettt ettt e e s reere e e s e e eereeaeans 4-3

ettt e e e e e e e e e ee o, 4-2

5-1

Loop-Back Plug (rear VIeW) ..........cccoooueeioveiieeeeeeeeeeeeeeeeee
e, Y 5-6

5-2

Connecting LOOP-BacCK PlUQG .......ccooiiiiiiiiiciicec ettt
e e st e et e e s e ee e eeeesens 5-6

5-3

BIt PAttern — Al OS. ..ottt
ettt et e et e et e e et e sere e st e eeraesereeseeereeeins 5-12

5-4

Bit PAttern — All 1S .ottt
ettt et e et e e et e et e e e e e eeeereee e 5-12

5-5

Location of Front Panel CoOMPONENTS .............ooiiiiiiiie ettt eee e s e e st e eeaeens 5-13

5-6

Head Signals. ...
e, 5-156

5-7

TIMING DIAGramM ...ttt
ettt e et e et e e e s tae s et e e et eeseereaaes 5-15

A-1

DLT1-A = Module M7800 .......c.oooieiieie

A-2

DLVTT = MOAUIE M7 Q40 ...ttt
ettt s e s e s e s eeeeeeereee eA-3

ettt ettt e e e et e st e e e e st e er e et eereanes A-2

A-3

KLBJ — MOAUIE IMBBED ...t
e
e e et e et ee st e e e e ee e e e ee e A-4

A-4

DLTTW MOAUIE IMT78BB ...ttt
ettt et e et e e e e e ereeereaeenae s A-5

TABLES

Table No.
1-1

Title
PRSOT SPECITICAtIONS ..o

Page
ettt et et e e e st e et e e e e e ereeeee e 1-3

3-1

REAAET CONLIOIS ..ottt
et e et e et e et e st e st e e ereeeaeesreeeeere e 3-1

3-2

SWILCH COMDBDINATIONS........iiiiiicii ettt
et et e et e et e e e e e e e e e et e eseeseeteans 3-2

5-1

Diagnostic Program for PDP-8...........c...oevvvvvivevenn.. ettt
e e e et e e s e —r e e e enrereeaas 5-3

5-2

Diagnostic Program fOr PDP-T1T ...ttt
e e e s e e, 5-4

5-3

Character Code DefiNitioNS ...........c.ccviiiiiiiiiiceceeeee
e
ee et e e et e e e e e e e e eseeseee e
5-7

5-4

VO It/ONMMELIET ChECKS .......iviiiiiece et
e e et e e e e st e e e s e e e e, 5-9

HAPTER 1
TRODUCTION

DESCRIPTION

The PRSO1 is a small, portable paper tape reader

(Figure 1-1)

that connects into the serial line of a

system console or terminal. The reader provides a convenient and inexpensive method of loading

paper tapes using the keyboard device codes of the terminal. It is designed primarily for loading
maintenance and diagnostic programs. Because the reader produces a 20 mA serial asynchronous

signal, it can be interconnected to a console device or terminal, or to any 20 mA current loop input if
no console device is available.

Figure 1-1

PRSO1 Paper Tape Reader

A switch on the reader permits selection of either the console keyboard or the PRSO1 as the com-

puter input device. This lets the user switch back and forth between devices without having to
disconnect the reader once it is installed. Operation of the reader is continuous with start and stop of
paper movement manually controlled by a front panel switch. Outside of this, the reader is similar in
operation to the low-speed reader on an ASR teleprinter.

The PRSO1 reads 8-level tapes with in-line feed hole. Two versions of the reader are available with
transmission rates of either 300 baud or 2400 baud.
The entire reader, including a self-contained power supply, is housed in a small 2-piece plastic case.
The back cover is removable for easy access to all subassemblies that are mounted inside the front
cover.
'
|
1.2

SCOPE

This manual provides the user with the information necessary to install, operate, and troubleshoot the
PRSO1 paper tape reader. The section on installation includes complete cabling and wiring information so that the reader can be connected to a computer system with or without a terminal.
1.3

SHIPPING LIST

A number of items are shipped with each reader. Make certain that the following items have been
received.
e

PRSO1 Paper Tape Reader

e PRSO1 Maintenance Manual (EK-PRS01-MM-001)
e PRSO1 Test Tape (MD-11-DZPRB-A-PT). This is a punched paper tape.

¢ PRSO1 Jumper Plug Parts (70-13435-0-0). These parts can be made into a plug or can be
used on the interface connector.

1.4

SPECIFICATIONS

Operating and physical specifications for the PRS0O1 reader are listed in Table 1-1. Complete cabling
and interface information is given in the section on installation (Chapter 4).
Note that the PRSO1 operates at either 300 or 2400 baud, depending on the model. The prime
differences between models operating at different baud rates are in the drive motor gearing and the
location of jumpers on the logic module.

1-2

Table 1-1

PRSO01 Specifications

Power Requirements

PRSO1-AA, PRSO1-BA

1T0A @ 117 Vac (=10%), 560/60 Hz

PRSO1-AB, PRSO1-BB

0.5 A @ 230 Vac (+10%), 50 Hz

Operating Temperature

16° C to 32° C (59° F to 90° F)

Humidity

20% to 80% (non-condensing)

Dimensions

30.48 cm wide by 19.05 cm high by 13.33 cm deep
(12 in. wide by 7-1/2 in high by 5-1/4 in deep)

Weight

2.9 kg (6-1/2 Ib)
Shipping weight is approximately 3.6 kg (8 Ib)

Feed Hole

In-line

Tape

8-level (£ 15% transmissivity)

Transmission Rates
PRSO1-AA, PRSO1-AB

2400 baud (approximately 120 char/sec)

PRSO1-BA, PRSO1-BB

300 baud (approximately 22 char/sec)

Interface

20 mA current loop, passive, with Mate-N-Lok connector (12-

09378-01)
Data

Data is in the form of a serial pulse string. Each character time

consists of one “start” bit, eight “data” bits, and one ‘‘stop” bit.
The high state in the diagram below is the quiescent state. It is

called the “mark” state. It is 20 mA of current flow. It represents a logic ONE. The low state in the diagram below is the
““space’’ state, no current flow, and a logic ZERO. The “'start”
bit is always a “space”, the “stop” bit is always a “mark”. The

data bits in between can be either. The first bit following the
“start” bit is the “least significant bit"’ or 2°,

le———CHARACTER TIME ——]
|

| !

I
LT

"L_J;;...,...
|

'11
-

START BIT

| ALl

IIIIII'—‘
N

DATA BITS

0's

)

STOP BIT

Standard Interface Cable

“Y"” cable,

(part of PRSO1)

connectors

Optional Interface Cable

Female Mate-N-Lok to Berg (BCO5M-1F)

CP-2992

3 m (10 ft) long, male and female Mate-N-Lok

1-3

1.6

MAINTENANCE

The basic maintenance philosophy of the PRSO1

reader is to “return to the nearest authorized

product repair center” in the event of a malfunction. Chapter 2 of this manual includes instructions
for repacking the reader in its original container so that the reader can be sent by mail or a preferred

carrier to the nearest DEC repair center. Either the local DEC field office or sales office should be

contacted to find out the address of the nearest product repair center.
If downtime might prove to be a problem, it is recommended that the user purchase a second reader
for backup purposes.
Although on-site troubleshooting and repair are not recommended, some users may prefer to perform their own maintenance. Therefore, this manual contains a chapter on troubleshooting and repair

procedures (Chapter 5). In addition, print sets and spare parts kits may be purchased separately by
the user, if desired. The print set order number is: PRSO1 Field Maintenance Print Set, No. MP00232

1-4

CHAPTER 2
REPACKING

2.1

INTRODUCTION

The basic maintenance philosophy of the PRSO1

reader is to “return to the nearest authorized

product repair center” in the event of malfunction. Therefore, it is necessary to save the carton and

‘packing material that was used to ship the reader.
2.2

REPACKING

When repacking the reader for shipment to a repair center, use the procedure given below.
1.

Make sure that you have the following items (Figure 2-1):

e Carton

Scored sheet

Die-cut sheet

e Two foam end caps.
Place the die-cut sheet over the top of the reader so the tape guide cannot swing freely

(Figure 2-1).

Place a foam end cap over each end of the reader, pulling the power cord through the end
cap as shown in the figure.
Place the reader in the carton.
Place the scored sheet on top of the reader and lay the power cord on top of the sheet.

Close the carton and seal with heavy tape.

2-1

PAPER TAPE

POWER CORD

SCORED SHEET

<) ’4’

AND MANUAL—\

AV MWL Y-W,
-

4'4"4"“"-7

"."

""“"-'v.v.y ”

W,
-,

DIE CUT SHEET

FOAM END CAP

PR/S01

REGULAR SLOTTED

CARTON SEALING

CARTON

TAPE

CP-2987

Figure 2-1

Repacking PRSO1 Reader

2-2

CHAPTER 3

OPERATION

3.1

SCOPE

This chapter describes operation of the PRSO1 reader and is divided into two parts: normal operation
and paper tape loading procedures.

3.2

NORMAL OPERATION

The PRSO1 has only two controls. These controls are listed in Table 3-1 below.

Table 3-1

Reader Controls

Control

Type

Function

Power ON/OFF switch

2-position toggle

Supplies power to the unit

ALTERNATE/READER switch

2-position toggle

Permits selection of either the PRSO1
reader

(READER

position)

computer terminal

position)

the

(ALTERNATE

computer

input

device

These two switches, combined with the reader logic, provide parallel 20 mA current paths for the
reader and the computer terminal. This feature eliminates transient signals that otherwise might

occur when switching between the two devices.

Reading paper tape is controlled completely by the front panel switches. Unlike other readers, the
PRSO1 cannot be started or stopped on individual characters. When the ALTERNATE/READER
switch is in the READER position, the tape will be read as long as the power ON/OFF switch is ON.
Turning the switch OFF stops all tape movement.

Normally, the reader is connected to both the console device (host) and a terminal. The terminal,
which is typically a keyboard/printer, usually has both a transmitter (TRAN) and receiver (REC)

section. Thus, the terminal can send signals to the computer (TRAN section) and receive signals from

the computer (REC section).

3-1

The PRSO1 reader is disabled when its power switch is OFF and its ALTERNATE/READER switch is
set to ALTERNATE. In this case, the computer system functions as if the reader were not connected.

When the ALERNATE/READER switch is set to READER, the reader is connected in parallel with the
keyboard. This parallel connection eliminates transients when switching from one device to another.

The reader is activated by turning the power ON/OFF switch ON. One of the legs of the switch
disconnects the transmitter portion of the keyboard. The other legs apply ac power to the motor that
moves the tape through the reader. Using this power ON/OFF switch is the only way of starting and

stopping the tape. As the tape is read, the reader logic sends the translated signals to the computer
through the ALTERNATE/READER switch. Because the receiver portion of the terminal is not dis-

connected, the terminal can be used for normal printing.
The four possible combinations of switch positions and the associated function of each combination
are listed in Table 3-2.

Table 3-2

Switch Combinations

Power

ALTERNATE/READER

ON/OFF Switch

Switch

Function

OFF

ALTERNATE

Reader disabled. Computer system functions
as if reader were not connected.

OFF

READER

Reader connected in parallel with keyboard
to

eliminate

transients

between devices.

when

switching

Reader is inactive.

Key-

board is inoperative.

READER

Reader starts reading tape. Continues reading tape until power ON/OFF switch is turned

OFF. Terminal can be used for normal printing. Keyboard is inoperative.

ALTERNATE

lllegal combination. Tape will move through
reader but cannot be read as reader logic circuits are disabled. Keyboard is inoperative.

3.3

LOADING PAPER TAPE

Although loading paper tape into the PRSO1 reader is a relatively simple procedure, the steps shown

in Figure 3-1 should be followed carefully to ensure proper loading and to prevent damage to the
paper

tape.

3-2

Insert edge of paper at a slight angle between read head station and tape guide

as shown at left. The beginning of the
tape leader should be at the left side of
the reader. The edge of the tape that has

three channels of data should be closest
to the reader. Note that any data to the
left of the read head will not be read be-

cause tape movement is right to left.
Once the tape is between the read head
and

tape

guide,

straighten tape and

push it toward the back of the read station.

B. With left hand, lift left side of tape to lift up
tape guide as shown at left.

Slide tape all the

way into the read station and then let it down

the

tape

guide

returns to

its original

position.

’* :
J&gg‘&:fi
e
SR

8473-2

C. With both hands, carefully move tape back
and forth until feed holes are engaged

(that

is, tape no longer moves freely). Loading is
now complete.

8473-3

Figure 3-1

Loading Paper Tape

Whenever using paper tape, a few simple precautions should be followed to prevent tape damage

and to ensure continual proper operation of the reader. These precautions are as follows.
1.

Keep tape clean at all times.

Handle tape carefully as it is somewhat fragile.

Make certain that tape being fed into the reader is positioned so that it is parallel to the
normal path of the tape.

Periodicaly blow out the read station to prevent accumulation of paper tape “dust.”

3-4

LAty

CHAPTER 4
INSTALLATION

4.1

INTRODUCTION

This chapter provides the information necessary for connecting the PRSO1 reader to a computer

system. The chapter is divided into four parts: general cabling information, reader connections, installation, and checkout procedures.

4.2

CABLING INFORMATION

As shown in Figure 4-1, the PRSO1 reader can easily be connected to computer systems with or

without terminals. If the computer does not have a terminal, an adapter cable is normally used to
connect the reader cables to the computer’s terminal interface. Because the type of adapter cable
needed depends on which computer terminal interface is used, it may have to be purchased

separately.
The PRSO1 reader converts information read from the paper tape into serial current pulses. Because

each pulse is 20 mA, the output of the reader is compatible with any 20 mA current loop line.
Figure 4-2 shows how the PRS01 reader is connected to a typical computer system. Note that the

reader is connected to both the console device (host) and a terminal. The terminal, which is typically

a keyboard/printer, can send signals to the computer (TRAN portion) and receive signals from the
computer (REC portion).

If the computer has a terminal, then the standard interface cable supplied with the reader is used to
interconnect the components as shown in Figure 4-2. This interface cable uses a "Y' connection so

that it can be inserted between the terminal and its interface. This cable, which is 3 m (10 ft) long, is
an integral part of the PRSO1 reader. The cable has one female and one male Mate-N-Lok connector
as shown in Figure 4-2. Required matching connectors to this cable are as follows.
Computer

Matching female connector for computer cable is:
Mate-N-Lok number 1-480459-0 with four number 350078-4 pins.
This connector is supplied with the PRSO1.

Terminal

Matching male connector for terminal cable is:
Mate-N-Lok number 1-480460 with four number 60620-4 pins.

4-1

If the computer does not have a terminal, a KL8-J or other asynchronous control can be used. In this
case, only the wires to pins 3 and 7 of P1 are used (Figure 4-2).
In some instances, the connectors on the cable supplied with the PRSO1 may not match the computer system connectors. For example, it is possible to have a terminal with a female connector,

making it impossible to plug into the PRS01 cable which also has a female connector. If this situation

should arise, special optional cables may be purchased to connect between the user’s equipment and
the standard PRSO1 cable.

COMPUTER

TERMINAL

CABLE

COMPUTER

SEENOTE1

COMPUTER

[}

SEE '10“51

CABLE

0000

SEE'iOTEZ

TERMINAL

allimel

| PRSO1
LOOP BACK PLUG
SEE NOTE 3

O0—00

SEE NOTE 2

{]

TERMINAL

l PRSO1
|
NOTE 1.

COMPUTER CABLE CAN BE BCO5M FOR SUCHINTERFACES

AS KL 8J, DLV11 ETC. OR 70-08360 FOR DL11A, C, W, ETC.

OR PRSO1 CABLE P1 CAN PLUG DIRECTLY INTO AN INTERFACE MODULE IN CASES SUCH AS KL8I, KL8E, KL8F ETC.
NOTE 2.

TERMINAL CABLE CAN BE BCO5F FOR TERMINALS SUCH

AS LA36 ETC.
NOTE 3.

LOOP BACK PLUG IS DESCRIBED IN CHAPTER 5 AS
|

STAND ALONE SYSTEM.

Figure 4-1

Reader Interconnecting Cables

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4.3

INSTALLATION

The procedure for installing the PRSO1 reader is given below. Make certain to perform the steps in
the sequence given below. Appendix A gives typical jumper/switch configurations for standard interfaces such as the DL11A, DL11W, DLV11, and KL8J.
1.

Make sure that the reader is connected to an active 20 mA current loop. If in doubt, insert

an ammeter into the current loop line. Current must be 20 mA, within a range of 15 to 30
mA.

Make certain that all optional cables are available if needed.

Connect the reader according to the schematic diagram in Figure 4-2.

Make certain that the reader power ON/OFF switch is OFF and the ALTERNATE/READER
switch is in the ALTERNATE position.

Plug in the reader ac power cord. This power cord must be plugged into the switched ac
line of the computer.

Installation of the PRSO1 reader is now complete. Procedures for checking proper operation of the

reader are given in the next section of this manual.

The procedure for checking out the PRSO1 reader once it has been installed is given below. Make

certain to perform the steps in the following sequence.
1.
2.

Verify that reader switches are in the OFF and ALTERNATE positions.
Check normal operation of the computer system. With the reader switches set as above,
the system should operate as before. In other words, it should appear as if nothing has
been connected to the system.

Load test tape into reader (refer to Paragraph 3.3 for proper loading procedures). Make
certain that blank tape (feed holes only) is beneath the read station and at least 15 cm (6
inches) of blank tape are between the read station and the first data character punched on
the tape.

Enter the diagnostic program that is applicable to the type of computer being used. Two

typical diagnostic programs are given in Tables 5-1 and 5-2. On some computers, such as
PDP-11/03, PDP-11/04, and PDP-11/34, the console terminal may be used to enter the
program. |f this is the case and the PRSO1 is connected to the console terminal it is
necessary to have the ALTERNATE/READER switch in the ALTERNATE position while

entering the program.

Start the program.

Place the ALTERNATE/READER switch in the READER position.

4-4

Place reader power ON/OFF switch to the ON position.

NOTE
As soon as the reader power ON/OFF switch is set

to ON, the tape should move. If it does not, then
either the power switch is not getting power or the
motor is defective. Check all cabling by referring to

the diagram in Figure 4-2.

Verify proper operation of the reader. Refer to either Table 5-1 or 5-2 for a description of
how the diagnostic program should function. If the reader does not function correctly (that

is, the program halts), refer to Chapter 5.

4-5

CHAPTER b5
TROUBLESHOOTING AND REPAIR

5.1

INTRODUCTION

This chapter is for users who have decided to perform their own maintenance of the PRSO1 reader. It
includes the information necessary to maintain, troubleshoot, and repair the reader. Users planning to
maintain and repair this device must have some basic knowledge of TTL circuits.

This chapter is divided into three main parts.

|dentifying Problems — Methods of identifying problems by using either the diagnostic program or the loop-back plug

External Troubleshooting — Covers basic volt/ohmmeter checks, 20 mA circuit tests using an

ammeter, and oscilloscope checks
¢

[nternal Troubleshooting — Describes failures and possible solutions for the four main reader

components which are read head, motor, transformer, and logic module
5.2

IDENTIFYING PROBLEMS

There are two basic methods that can be used for identifying PRSO1 reader problems. One method is

used when the reader is connected to a host computer. The other method is used when the reader

and a terminal are tested as a stand-alone system.
When used with a computer, the reader can be tested by using a diagnostic program. Paragraph

5.2.1 covers the diagnostic program used with a PDP-8 computer while Paragraph 5.2.2 covers the
program used with a PDP-11.

When tested as a stand-alone system, the reader and terminal are connected by means of the loop-

back plug. This test is described in Paragraph 5.2.3.

5-1

5.2.1

Diagnostic Program for PDP-8

The diagnostic program given in Table 5-1 can be used with any PDP-8 computer provided the

computer has a KL8J interface or an interface that is program compatible. The procedure for using
this program is given below.

Toggle the program into the PDP-8 memory (locations 200 through 225). Note that loca-

tions 204 and 206 must contain IOT instructions that reflect the device code of the KL8J
to which the PRSO1 reader is connected.
2.

Place test tape loop into PRSO1 reader so that the nulls section of the tape will be read
first.

Place reader READER/ALTERNATE switch to the READER position.

Start the program.

Place reader power ON/OFF swifch to the ON position.

Program will halt at location 216 if it detects an error.

If an error occurs, examine location 224 (CHARWS) to determine what was read. Then

examine location 223 (CHARSB) to find out what the program was expecting.
8.

When the program is running, the accumulator display will reflect the character that the
reader is expecting. If these lights always indicate 377, it means that the program is either
not reading characters, or that it is reading nothing but all Os.

If the program is used with a machine that has no accumulator display, the program can be

stopped while it is reading non-zero characters and location 225 can be examined to
ensure that non-zero characters can be read.

5.2.2

Diagnostic Program for PDP-11

The diagnostic program given in Table 5-2 can be used with any PDP-11 computer provided the

computer has a DL11 interface or an interface that is program compatible.
This diagnostic program expects a tape consisting of nulls, followed by a decrementing pattern

starting with 377 and ending with 1, followed by more nulls.
The program will halt at location ERROR if it detects a bad code or a DL11 error bit. When the

program halts, location 1040 holds the value of the expected character while RO holds the value of
the character actually received.
Before running this program, make certain that location 1002 contains the address of the DL11 CSR

(control and status register).

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5.2.3

Stand-Alone System

The following procedure should be used to connect the PRSO1 reader to the terminal by means of
the loop-back plug shown in Figure 5-1. Make sure to perform the steps in the sequence given

below.
1.

Disconnect power from both the terminal and the PRSO1 reader.

Connect the loop-back plug to the male connector of the reader and the terminal to the

female connector of the reader as shown in Figure 5-2.

Place the reader ALTERNATE/READER switch to the READER position.

Apply power to the terminal and set terminal switches to ON LINE.

Load test tape (DZPRB-A-PT) into the reader. Make sure to position the tape so that at
least 15 cm (6 inches) of blank tape are between the read station and the first data
character on the tape.

Place the reader power ON/OFF switch to the ON position.

The following pattern should be observed. If the reader does not function correctly, refer to
Paragraph 5.3.

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characters (such as the LA36). Some terminals might vary in code definitions. If this should
be the case, refer to Table 5-3.

5-5

PIN 8

PIN CONNECTIONS
@

1TOB6

2TO0 7

3708

PIN 1
CP-2988

Figure 5-1

LOOP-BACK

PLUG

Loop-Back Plug (rear view)

MALE

PRSO1 READER

MATE-N-LOK

@——— PRSO01 “Y"” CABLE

TO TERMINAL
”

TERMINAL

FEMALE

—

CONNECTOR] MATE-N-LOK

CP-2989

Figure 5-2

Connecting Loop-Back Plug

5-6

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Table 5-3
Character Code Definitions

Some terminals only recognize a 7-bit code. If this

NOTE

is the case, ignore row B8 in the chart.

—

5-7

CP-2997

5.3

EXTERNAL TROUBLESHOOTING

The following paragraphs present three different methods of troubleshooting the PRSO1 reader. Each

of these methods requires different equipment and a different level of expertise.

Basic Volt/Ohmmeter Checks

5.3.1

These checks can all be made by using a simple volt/ohmmeter.
1.

Separate the PRSO1 reader completely from the system.

Disconnect power from the reader.
Place reader ALTERNATE/READER switch to ALTERNATE position.

Place reader power ON/OFF switch to the OFF position.
Using the information in Table 5-4, check all but the last function.
Place reader power ON/OFF switch to the ON position and check the appropriate function

in Table 5-4.
NOTE

Although the power switch is ON, there is no power applied to the reader at this time.
Change meter setting so that it can read 5 V.

Apply power to reader and check appropriate function in Table 5-4.

5-8

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5.3.2

20 mA Circuit Tests

The loop-back plug and an ammeter are required to perform the 20 mA circuit tests.
1.

Connect loop-back plug to male connector (P1) of the PRSO1 cable.

Set ammeter scale to read 20 mA of current.
Place reader ALTERNATE/READER switch to READER position.

Connect meter leads to female connector (P2) as follows:
~

Positive lead (red) to pin 5

Negative lead (black) to pin 2.

Place reader power ON/OFF switch to ON position. Meter should indicate a current ranging from 18 to 25 mA. Current may possibly be as high as 35 mA (upper level maximum
current for PRSO1 output circuit).

Place reader ALTERNATE/READER switch to ALTERNATE position and verify that current
goes to zero (this step breaks the circuit).

The above checks, performed as indicated, verify that the PRSO1 is supplied with 20 mA of current
and the output circuits will function properly.
7.

Place reader power ON/OFF switch to OFF position.

Load diagnostic test tape into reader.

Place reader power ON/OFF switch to ON position.

10.

Observe that current rises and falls in proportion to the type of bits being read. That is, the
current will be higher when reading all 1s, and lower when reading all Os. This indicates
that the PRSO1 reader can load and transmit data.

5-10

5.3.3

Reader Circuit Tests

The loop-back plug, a paper tape punch, and an oscilloscope are required to perform these circuit
tests.

Use the paper tape punch to prepare two paper tape loops. One loop should contain all Os
(feedholes only); the other should contain all 1s.

Connect the loop-back plug to P1 of the reader.
Connect a jumper between pins 2 and 5 of reader plug P2.
Place reader ALTERNATE/READER switch to READER position.
Load paper tape loop containing all Os into the reader.

Place reader power ON/OFF switch to the ON position.

Place oscilloscope probe on pin 2 of connector P2. Verify that the signal shown in Figure

5-3 is present.

Place reader power ON/OFF switch to the OFF position.
Remove the all Os tape loop and load paper tape loop containing all 1s into the reader.

10.

Place reader power ON/OFF switch to the ON position.

11.

Verify that the signal shown in Figure 5-4 is present.

5-11

2400 BAUD = 3.76 ms }
300 BAUD = 29.9 ms

]0]1[2|3|4|6|6|7l

NEXT CHARACTER
L]

STARTBIT

—

——

8 DATA BITS

STOP BIT

(ALL O’s)
CP-2993

Figure 5-3

Bit Pattern — All Os

DEAD TIME

|
—+|

N
|
l

|&— 2400 BAUD = 416 us

|\0:1:2:3:4:5:a:71:r:

300 BAUD = 3.3 ms

START BIT

8DATABITS
(ALL 1's)

STOPBIT

L_—J——T——
START BIT NEXT

CHARACTER

CP-2994

Figure 5-4

Bit Pattern — All 1s

INTERNAL TROUBLESHOOTING

In order to troubleshoot the internal components of the PRSO1 reader, the user must have a complete PRSO1 Field Maintenance Print Set, Number MP00232.

If the PRSO1

reader is still under warranty, DEC Field Service should be notified if the user is

planning to troubleshoot the reader.

Subsequent paragraphs list each of the four main reader components and include trouble symptoms,

tests, probable causes, and possible solutions.

5.4.1

Tape Path Problems

Symptom:

Tape movement problems that show up as intermittent data
errors.

Test:

Check for 0.010 inch clearance below tape holder (Figure 5-5).

Probable cause:

Out of adjustment.

Solution:

Loosen mounting screw and adjust clearance using appropriate

tools.

Symptom:

Same as above.

Test:

Check to ensure that motor mounting bolts are tight.

Probable cause:

Loose mounting bolts.

Solution:

Tighten mounting bolts.

Symptom:

Same as above.

Test:

Check sprocket wheel to ensure it is not loose on shaft.

Probable cause:

Loose set screw.

Solution:

Tighten set screw.

(
_

O[]

TAPE HOLDER

SPROCKET WHEEL

Figure 5-5

Location of Front Panel Components

5-13

MA-1568

5.4.2

Motor

Symptom:

Motor does not turn when PRSO1 power ON/OFF switch is in

ON position.
Test:

Check 115 V (or 230 V) input at fuse.

Probable cause:

Bad fuse.
No input power.

If input power is present and fuse is good, the motor is defective.

Solution:
5.4.3

Replace motor.

Transformer

Symptom:

+5 V not present on logic module.

Test:

Check

input

voltage

transformer.

Refer

E-UA-PRS01-0-0.

If input voltage present, check ac input to logic module (trans-

former output).
Probable cause:

Defective transformer.

Solution:

Replace transformer.

544

Head

Symptom:
Test:

No serial output from logic module.

Check to make sure head is plugged into control module with
brown wire as pin 1 of J1.
Next, check to make sure there is approximately +3.6 V on
pins 6, 7, and 10 of J1.

With no tape in the reader and +5 V power applied, pins 1, 2,

3.4,5, 8,9, 15, and 16 should all be less than 0.5 V.
Use a tape of all Os and observe that pin 3 is the only pin
switching. This is the feedhole that enables the logic. The remaining outputs should be approximately 4 V.

Use a tape of all 1s to check thresholds of the head signals in
order to make sure that head signals are within the prescribed
points as shown in Figure 5-6.
Probable cause:

If all voltages are correct but head signals are not, the head
could be loose or it could be defective.

5-14

Solution:

Make sure head is tightened properly to the front mounting
plate. Improper mounting affects alignment of head signals.
If head is mounted properly and problem is still present, then
replace head.

MIN. 1.6V
NO/DATA

HEAD SEES DATA

0.6V ABOVE

GND OR LESS

GND —— ——
‘

CP-2995

Figure 5-6
5.4.5

Head Signals

Logic Module

If the other PRSO1 reader components (motor, transformer, and head) check out properly, the logic
module can be checked by using the timing diagram shown in Figure 5-7. This timing diagram is the

DATA

FEED

HOLE

LOAD

‘——d——‘.————l—afl-——_ owe ews cmn

same for both the 300 baud and 2400 baud models.

~40% OF DATA

(PARALLEL LOAD)

SHIFT ENABLE LOW

!
CLOCK —=i

2400 BAUD = 416 us
300 BAUD = 3.3 ms

(SERIALOUT)

I
fo—

}
I

SERIAL OUT

4
v

START BIT

DATA BITS

STOP BIT
CP-2996

Note: One clock time after shift enable goes low, serial out begins.

Figure 5-7

Timing Diagram

5-16

APPENDIX A

JUMPER/SWITCH CONFIGURATIONS

This appendix provides typical jumper/switch configurations for some standard interfaces. These
interfaces are:

DL11-A

Figure A-1

DLV11

Figure A-2

KL8J

Figure A-3

DL11W

Figure A-4

A-1

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pI £

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1NO=18N(S1l9 vivas)

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= 1§D

8 A3H ‘HO13 OV6LN

BCO3 CABLE

TO HOST

PEV

A10 o

NB1

Al11

NB2

Al12

= ICH
o
NP

FEH

CONFIGURATION

g CL1

SHOWN

CL2

CL3

O L4

FRO

FR1

o=@

FR2 o

FR3 o

NOTE:

{

Module shown above is jumpered for:
1) Standard device address of 177650

2) Standard device vector of 300
CP-2985

Figure A-2

DLV11 - Module M7940

A-3

v-v

GG98IN 8INPOIN — M8

€-V @inbiy

(Ajuo uonesedo edAjeje) pneq Q| L 10} pejjeisul)

e|qeu3 = uj e|qesiq = InQ Je3jid 8dAlelel

LM/ALL

(pneq o€ eAoqe uoneiedo GOLA 10} pejjeisul)

986¢2-d0

o
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79N I8N
©

e|qeu3 = uj ejqesiq = INQ 8|qBUT PIOM SMIEIS

EM/AMS

1NO

1no

zZaN

1NO

1No

LEN

1eyy/sug eleq

|
EM

e|qeu3 = uj €|qesiqQ = INQ e|qeug 163081y o||td

lejoeieyy/silg ejeQq jo JequinN

usaz = 1NO

Aued ueny

Aued = NI

Alued ON = 1NO

Aued oN

euo = NI

sligdois z = LNO

siig dois

vM/8S

ams

NA3
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ut GM 1IN0 ZM

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: 4

peeds enledey '€g pue ‘z8

‘L8 Aq 10s peeds jwsuel]

(8oaw)

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440

«1

(LOAW)

0—

0SL = H

0o—

(90aiN)

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(S0a)

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(vOaWn)

(E0OAN)

[

‘oules ay) eie

speads @A1eeJ puB Jjwsuel)

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JAI303H

(‘'Ppneq QLL =
peeds pue ‘0 = 8pOd 891AEp JlwisuBL)

0o-

cg9=0S1l=H

d
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69G1L-VIN

| ES

NS M
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€

g onl

N
l

0L = HOL1D3A ‘085.LL = $S3HAAY

NO
= N

¢ | ¢

N |

A
4|

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‘
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]6ss

L
T

N 4]

6 8 L 9 § ¥ £ ¢

N|XxX]|

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d3sn LON = LINSNVHL

007 VIN 0Z “‘dNV8 00vZ HO 00E 'IAILOV = IAIFOIY

HIHLIA
=X
140 = o

5’|

|ecs

Tl o ki LELELE
C_]

es”

09 = HOLD3A ‘09544 = SSIHAAY

ALIHVd ON ‘LIS dOLS | ‘SLI8 VL1VA 8 = LYWHO

d001 VIA 0Z ‘N8 00€ 'IAILOV = LINSNVHL

4007 VIN 0Z ‘aNV8 00¥Z HO ANV4 00€ ‘JAILOV = IAITOIH

'LOSHd IHL HO4 0STV ANV 3T0SNOD

AYVANVYLS IHL H109 HOd4 FJOV4HILNI NV SV MLLTd FHL ONISN NIHM — | 37dINVXT

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» W\I

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[]

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sopegeeeee|

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C[—1

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CO CO

— = 1

CJ1

=
1 CJ [

|
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HOLO3INNOD

D43d

[

—1

— 1

]

[

Gs—

| L]
1

'ATNO LOSHd HO4 JOV4HILINI ILVHVAIS V SV MLLTA IHL ONISN NIHM — Z ITdNVX3

310N |310N

x| x|

ALIHVd ON ‘118 dOLS | 'S118 V1vd 8 = LYWHOH

‘LOO-WIN-ML LTA-D3 TYNNVYIN O1 43434 MLL1Ad IHL NO NOILVINHO4NI TVNOIL1ddV HO04

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