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EK-VT100-J1-001

September 1978

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Document:	VT100 Mini Maintenance Hardware Guide
Order Number:	EK-VT100-J1
Revision:	001
Pages:	28
Original Filename:	http://bitsavers.org/pdf/dec/terminal/vt100/EK-VT100-J1-001_VT100_Mini_Maintenance_Hardware_Guide_197809.pdf

OCR Text

VTlOO
MINI
MAINTENANCE
·HARDWARE GUIDE

E K-VT100-J1 -001

VT100 Mini Maintenance
Hardware Guide.

digital equipment corporation • maynard, massachusetts

1st Edition. September 197 a

CONTENTS.

CHAPTER 1
TROUBLESHOOTING
1.1
1.2
1.3
1.4

TROUBLESHOOTING WITH THE
SELF-TEST FEATURES ....................................... 1-1
TROUBLESHOOTING THE BASIC
TERMINAL .............................................................. 1-1
TROUBLESHOOTING THE OPTIONS .............. 1-1
RECOMMENDED SPARES LIST(RSL) ......... 1-10

CHAPTER 2
OPERATING SUMMARY

The material in this manual is for informational purposes and is subject
to change without notice.

2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7

Digital Equipment Corporation assumes no responsibility for any errors
which may appear in this manual.

CHAPTER 3
TESTING THE VT100

Printed in U.S.A.

This document was set on DIGITAL's DECset-8000 computerized
typesetting system.

The following are trademarks of Digital Equipment Corporation.
Maynard. Massachusetts:
DEC
DECCOMM
DECsystem-10
DECSYSTEM-20
DECtape
DEC US
DIGITAL

MASSBUS
PDP
RSTS
TYPESET-8
TYPESET-11
UNIBUS

SET-UP...................................................................2-1
SET-UP A ........................................................2-.1
SET-UP B ........................................................2-2
Changing a SET-UP Feature ..................... ~ .. 2-4
Setting the Answerback Message ............... 2-4
Saving SET-UP Features ..............................2-5
Recalling SET-UP Features ..........................2-5
Resetting the Terminal.. ................................. 2-5

3.1
3.1.1
. 3.,1.1.1
3.1.1.2
3.1.2
3.1.2.1
3.1.2.2
3.1.3
3.1.3.1
3.1.3.2
3.1.4
3.2

INTERNAL SELF TESTS ............ _.......................3-1
Power-Up Test ...............................................3-1,
Description ...............................................3-1
Performing the Test ............- ..................3-2
Data loopback Test ..................................., .. 3-.2
Description ...............................................3-2
Performing the Test ................................3-2
Video Adjust Test..: ........................................3-3
Description ...............................................3-3
Performing the Test .. _.., ....... - ................3-3
Error Codes ...........................;..........................3-3
USE OF THE PMK04 TESTER ......... _................3-4

CHAPTER 4
VIDEO ALIGNMENT
4.1
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9

GENERAL. .............................................................4-1
MONITOR ADJUSTMENTS ...............................4~1
Brightness .......................................................4-1
Focus ...............................................................4-2
·Yoke .................:........................:.......................4-2
vertical Height ...............................................4-4
Horizontal Width ................... :..:.....................4-5
Centering.........................................................4-6
Vertical Linearity ............................................4-6
Horizontal Linearity .......................................4-7
Vertical Hold ...................... ,...... :..................... 4-7

iii

CHAPTER 6
MODULE REMOVAL AND
REPLACEMENT
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
5.16.1

GENERAL. ............................................................. 5-1
ACCESS COVER ...................................................5-1
TERMINAL CONTROLLER BOARD .................. 5-1
ADVANCED VIDEO BOARD .............................. 5-3
20 mA CURRENT LOOP BOARD ...................... 5-4
KEYBOARD TOP COVER .................................... 5-4
KEYBOARD ........................................................... 5-4
KEYBOARD CABLE .............................................5-5
KEYBOARD SPEAKER. ....................................... 5-5
TOP COVER ...........................................................5-6
VIDEO MONITOR BOARD ................................. 5-6
FLYBACK TRANSFORMER ............................... 5-8
BOTTOM COVER .........................................•....... 5-9
POWER SUPPLY .................................................. 5-9
DC POWER HARNESS ..................................... 5-10
FIELD SERVICE CRT MONITOR
ASSEMBLY......................................................... 5-11
CRT Storage and Disposal. ........................ 5-12

5-4
5-5
5-6
5-7
5-8
5-9
5-10
6-1
6-2

Keyboard Disassembly ........................................5-5
Cover Removal ......................................................5-7
Video Monitor Board Removal. .......................... 5-7
CRT Anode Discharging ...................................... 5-8
Power Supply Removal .......................................5-9
Power Supply Capacitor Discharging .............5-10
DC Power Harness Removal. ........................... 5-11
Advanced Video Option lnstallation ..................6-2
Current Loop Option ............................................6-3

TABLES
1-1
1-2
1-3
1-4
2-1
3-1
3-2

Keyboard LED Error Codes ................................. 1-1
Display Error Codes.............................................. 1-2
Basic VT100 Troubleshooting Procedure ........ 1-4
Recommended Spares ...................................... 1-10
SET-UP Feature Change Summary ...................2-4
LED Error Codes ...................................................3-3
Displayed Error Codes .........................................3-4

CHAPTER 6
VT100 OPTIONS
6.1
6.2
6.2.1
6.2.2
6.3
6.3.1
6.3.2

GENERAL ..............................................................6-1
ADVANCED VIDEO OPTION ............................. 6-1
Advanced Video Option
Installation ...................................................... 6-1
Advanced Video Option Checkout .............. 6-1
20 mA CU ARENT LOOP OPTION ..................... 6-2
20 mA Current Loop Option
Installation ...................................................... 6-2
20 mA Current Loop Option
Checkout .........................................................6-4
CHAPTER 7
PHYSICAL/FUNCTIONAL BLOCK
DIAGRAM

FIGURES
2-1
2-2
2-3
4-1
4-2
4-3
5-1
5-2
5-3

SET-UP A Presentation .......................................2-1
SET-UP B Presentation .......................................2-2
SET-UP B Summary ............................................ 2-3
Video Alignment Templates ...............................4-3
Video Monitor Board Adjustments .................... 4-4
CRT Adjustments .................................................4-4
Module Removal Sequence ................................ 5-2
VT100Termina1View .......................................... 5-3
Terminal Control Board with Advanced
Video Option .........................................................5-3

CHAPTER 1
TROUBLESHOOTING

1.1 TROUBLESHOOTING WITH THE SELF-TEST FEATURES
The VT100 contains a series of internal self-tests designed to isolate
a failure to a field replaceab1e unit (FRU). Tables 1-1 and 1-2 show the
error codes. the detected failure. and the FRU which should be replaced.
Table 1-1
Keyboard LEDs
L1
OFF
OFF
OFF
OFF
OFF

OFF
OFF
OFF
ON
ON

OFF
ON
ON
OFF
OFF

L4
ON
OFF
ON
OFF
ON

Keyboard LED Error Codes
Error Detected

Replace FRU

ROM1
ROM2
ROM3
ROM4
Main Data RAM

Terminal Controller
Terminal Controller
Terminal Controller
Terminal Controller
Terminal Controller

1.2

TROUBLESHOOTING THE BASIC TERMINAL
Table 1 -3 lists the .most common VT100 failures and associated
symptoms. To use this table simply select the symptom that matches
the terminal failure.

1.3

TROUBLESHOOTING THE OPTIONS
Troubleshooting the terminal options should be performed after the
basic terminal is checked and found to be good. Once this is done.
perform the option checkout procedure for the suspected faulty option
as outlined in Chapter 6. If the option does not check out correctly.
replace the option module.

1-1

Table 1-2

Display Error Codes
Error Detected

Error
Character
Displayed

Advanced
Video

2
3
4

8
9

x
x

;

Date
Loopback

EIA

Replace
Advanced Video
Terminal Controller
Advanced Video and··
Terminal Controller
Keyboard
Advanced Video and ·
Keyboard
Terminal Controller
and Keyboard
Advanced Video. Terminal
Controller and Keyboard
Terminal Controller
Advanced Video and
Terminal Controller
Terminal Controller
Terminal Controller and
Advanced Video
Keyboard and Terminal
Controller
Advanced Video. Keyboard and

x
x
x

x
x
x
x

Keyboard

x
x

Nonvolatile
RAM

-·

x
x

Terminal Controller
I

x
x
x

-w

F
G

L
M

x
x

x
x
x
x

x
x

Terminal Controller
and Keyboard
Advanced Video. Keyboard and
Terminal Controller
Terminal Controller
Advanced Video and
Terminal Controller
Terminal Controller
Advanced Video and
Terminal Controller
Keyboard and
Terminal Controller
Advanced Video. Keyboard and
Terminal Controller
Keyboard and Terminal Controller
Advanced Video, Keyboard and
Terminal Controller
Terminal Controller
Advanced Video and
Terminal Controller
Terminal Controller
Advanced Video and
Terminal Controller
Keyboard and Ter_minal Controller
Advanced Video. Keyboard and
Terminal Controller
Keyboard and Terminal Controller
Advanced Video. Keyboard and
Terminal Controller

Table 1-3
Basic VT100 Troubleshooting Procedure
General notes on using the basic terminal troubleshooting chart:
1. This chart assumes that only one field replaceable unit (FRU) has
2. Spare parts do fail. The possibility of a failure should not be disfailed. The symptoms displayed may be representative of a multiple
counted just because the module has been replaced once.
failure. and as a result. the symptoms may change as FRUs are
3. Power must be turned off before any of the FRUs are disconnected
replaced. Always troubleshoot according to the current symptoms.
or replaced.

Symptoms

Probable Cause

Corrective Action

No response when the power switch is set to
the on position. The CRT filament is not lit
and LEDs are not on.

Not plugged in; no power at wall socket.

Plug in VT100; use different wall socket if
possible.

Main power fuse

Replace fuse (if fuse blows again there is a
possible shorting problem).

Power supply

Replace power supply.

AC line cord

Check for open or short and replace line cord

Power distribution harness

Replace harness.

Power Supply

Replace power supply.

Terminal controller board

Replace board.

Power distribution

Replace harness

No response when power switch is set to the
on position and the CRT filament is lit.

There are no audible tones when the terminal
is turned on. LEDs are lit.

There are no audible tones when the terminal
is turned on and none of the keyboard LEDs
are lit.

Cursor does not appear on the screen after
the terminal is powered up. The CRT filament
is turned on.

Keyboard

Replace.

Keyboard cable

Replace.

Controller ·

Replace.

Speaker

Replace.

Keyboard disconnected

Connect.

Keyboard cable

Replace.

Keyboard

Replace.

Controller

Replace.

Connectors

Check and reconnect.

Screen brightness too low

Adjust monitor brightness (Paragraph 4.2.1),

Controller

Replace.

Monitor Board

Replace.

Flyback transformer

Replace.

DC power harness

Replace.

F.S. monitor assembly

Replace.

Table 1-3

(,,

Basic VT100 Troubleshooting Procedure (Cont)

Symptoms

Probable Cause

Corrective Action

Cursor does not appear on the screen after
the terminal is powered up. CRT filament is
not on. Keyboard is functional.

Monitor fuse open

Replace monitor board.

Monitor wiring

Replace monitor board.

DC power harness

Replace.

F.S. monitor assembly

Replace.

Random characters appear on the screen.

Controller

Replace.

A horizontal or vertical line appears on the
screen.

Monitor connectors

Check and reconnect.

Monitor board

Replace.

Screen display is distorted. Characters are
narrow on the left or right side of the screen.

F.S. monitor assembly

Replace.

Monitor is misadjusted

Adjust monitor (Chapter 4).

Monitor board

Replace.

Flyback transformer

Replace.

F.S. monitor assembly

Replace.

Controller

Replace.

-·--

The display presentation bows in or out.

Yoke pincushion misadjusted

Replace ~.S. monitor assembly.

Screen display is jumpy

Interlace feature on

Turn feature off.

Wrong power feature set

Set feature to correct I ine frequency.

Controller

Replace.

Power supply

Replace.

Monitor board

Replace.

The wrong character appears on the screen
when typed in LOCAL mode.

The wrong character appears on the screen
when typed in the ON-LINE mode with
loopback installed. Terminal functional in
LOCAL mode.

Flyback transformer

Replace.

Graphics. or alternate character set. or
alternate keypad mode. or cursor key mode is
selected.

Clear condition with power up or RESET

Keyboard

Replace.

Controller

Replace.

Graphics. or alternate character set, or
alternate keypad mode. or cursor key mode is
selected.

Clear conditions with power up or RESET.

Transmit and receive speed not the same·

Change spe~d setting.

Controller

Replace.

Table 1-3

Basic VT100 Troubleshooting Procedure (Cont)

Symptoms

Probable Cause

Corrective Action

The wrong characters appear on the screen
when typed in the ON-LINE mode and
connected to computer. Terminal is
functional with loopback connector .

Receive and/or transmit speed set incorrectly

Set speeds to match computer.

Bits per character feature set incorrectly.

Set feature to match computer.

Parity feature set incorrectly

Set parity and/or parity sense feature to
match computer.

Communications line

Check communication facilities.

XON/OFF feature set incorrectly

Set feature.

Computer does not recognize XON/OFF
sequence

See Chapter 3 of VT100 User's Guide.

Controller

Replace.

....

cio

Messages received are incomplete

Parity feature set incorrectly

Set parity and/or parity sense feature to
match computer.

Controller

Replace.

Communication facility problem

Check communication facility.

All characters displayed as a white area
(black with reverse screen).

Alternate character set selected and not
available.

Clear condition with power up or RESET.

Only top or bottom half of characters are
displayed on tile screen.

Incorrect use of double height escape
sequence

See Chapter 3 of VT100 User's Guide.

The S.ET-UP features do not work correctly
(multiple alarms may sound on power up or
recall).

Save operation not performed.

Perform Save operation.

Controller

Repla<'.e controller.

Power supply

Replace power supply.

ANSl/VT52 feature set incorrectly

Set ANSllVT52 feature to correct
compability.

Checkerboard character appears on screen
instead of character typed (on-line with
computer).

·The terminal does not respond to escape
sequences.

1.4 RECOMMENDED SPARES LIST (RSL)
Table 1-4 lists the recommended spares for the Basic VT100.
Included in this list are spares for the Advanced Video Option and the
20 mA Current Loop Adapter Option.
Table 1-4
Quantity

10
1
1

2
5
5
5
15
15

5
15
15

5
15

5
5
5
5

Recommended Spares

Description

Part Number

Monitor printed circuit board
30-14590-02
Terminal controller PCB
54-13009
Advanced Video PCB
54-13097
20 mA Adapter assembly
70-15273
20 mA Interface cable ( 15 ft)
. BC05F-15
EIA cable (M-FI (10 ft)
BC05D-10
EIA cable (null modem)
BC03M-10
LK keyboard
70-15765
Cable assembly, keyboard
70-14652
Speaker
. 12-15050
LK07 keycap set
12-14333- 72
LK08 keycap set
12-14333-91
Keycap removal tool
74-16355
Power supply assembly
70-14979
Power switch
12-15232
Voltage select switch. 110 V/220 V 12-14155-03
Fuse. 3 A
90-07217
line cord. 115 V
170083-09
line cord. 230 V
170083-10
DC power distribution cable
70-14978
Card guide
12-12405-00
Retainer ring•
90-10007
Support. chassis•
90-09747-01
Cable clamp•
90-1001 6-00
Plunger, chassis mounting•
90-09964
Grommet. chassis•
90-09966-01
Captive screw•
12-14811
Plunger, base mounting•
12-14740-00
Plunger, base mounting•
90-09965-00
Standoff. AVO •
90-09747-03
Grommet. base•
90-09966-00
Mounting screw•
12-14817
Feet•
90-09624-00
Fuse holder•
12-12893
Screw. #6-20 X 1/2. hex head
90-09680-04
Screw. #6-32 X 5/16
90-09701-00
CRT mask. alignment
94-03220-03
Shaft extender
29-23189-00
Alignment tool. monitor·
29-23190-00
Kit. carrying case
29-23187
l.C. container
99-05812
loopback connector. RS232C
12-15336
loopback connector. 20 mA
70-1 5503-00
Flyback transformer. Ball monitor
30-14590-01
F.S. monitor assy, Ball monitor t
70-16187

·These items are expendable.
tThis assembly consists of the CRT. yoke. vertical coil. flyback transformer. video monitor board. and sheet metal enclosure.

1-10

CHAPTER 2
OPERATING SUMMARY

2.1
SET-UP
SET-UP mode is a special mode of operation that allows the user to:
1 . Enable and disable the termina I features
2. Enter and. store a 20-character answerback message
3. Save the selected features in a nonvolatile memory
4 .. Temporarily change the terminal features and then recall the original
settings.
To perform these functions SET-UP mode is divided into two display
presentations: SET-UP A and SET-UP B.
2.1.1
SET-UP A
To enter SET-UP A press the SET-UP key. The display will now have
a presentation similar to Figure 2-1. The bottom line of the display
consists of a ruler that numbers each character position available on a
line. The location of each tab stop is shown by a "T" placed above the
ruler.

SET-UP·A
TO·EXIT·PRESS·•SET-UP"

Figure 2-1

SET-UP A Presentation

2-1

In SET-UP A mode the following features may be changed:

TABS
BRIGHTNESS
CHARACTERS PER LINE
LINE/LOCAL

cw
w

Q..
(/)

a:
See Paragraph 2.1 .3 to change a feature.

2.1.2
SET-UP B
SET-UP B mode may only be entered from SET-UP A mode. To enter
SET-UP B from SET-UP A. press the 5 key on the main keyboard. The
display will have a presentation similar to Figure 2-2. Figure 2-3 summarizes the SET-UP B presentation.

..........
"'"'
mm

,.... Q)

c~
o.w

II II

£ x e..~ ::t z e =.,

SET-UP
B
TO EXIT PRESS "SET-up•

~
o

o
~a:
a:

u..
u.. z

•

H II
0

c
z

a..
a:

::t

u..

SET-UP B Presentation

00
II II
~ =.,

u..
LL.

(')

cc
zz

0
:::>

~ .....
a: ::c

<( (!) z
...,:::> :::!: ~ -, c::;
:::>al

....I

(/)

~.. -.J

_.
_.

(/)

2-2

.....
<(
w
w

Q..

0
.....
:::>
<(

.....

::c ::tz
.....
0 0 mm a: ~

~·O

....

(!) (!)

a: a:

a..0

II. II

F
N'

~:J~::.,
a:
z
w
w

"'a:

.:::>·

-1

2-3

u n

~~='
ID

oo
<( <(

u..
u..z
u..
u.. z

!> ~ 0 0

w
z
::;

N-

ID fn

:::> :::>
100
~~

::t z

I I '

>
t:

-------

~::,~'.:lffi ~
w ::c
w
0
.....
z
~ §
:::;
a: w
w
~
(/)
.....
·W
~

>
t:

_ _ _ __,

II.II~

z u.. z ~
\..0 :J 0 0 0 0 :::>

Figure 2-2

-g

_ _..

00
II

a..

~::.,

w
~
wen

:::;
0

>
w

00
II II

~ ::.,

-I·

w
m

c;
a:

':::!:

2.1.3

Changing a SET-UP Feature
Table 2-1 summarizes the SET-UP features. indicates the SET-UP
mode required to change the feature. and shows the key used to change
the feature.
Table 2-1

SET-UP Feature Change Summary

SET-UP Feature

ANSWER BACK
ANSl/VT52
AUTO REPEAT
AUTO XON/XOFF
BITS PER CHARACTER
BRIGHTNESS
CHARACTERS PER LIN'E
CURSOR
INTERLACE
KEYCLICK
LINE/LOCAL
MARGIN BELL
NEW LINE
PARITY
PARITY SENSE
POWER
RECEIVE SPEED
SCREEN
SCROLL
TABS
TRANSMIT SPEED
WRAPAROUND

Changed In
SET-UP A SET-UP B

x
x
x
x
x
x

x
x

Iii

[[!
[[I
[[J

·mor[J

!]]

x
x
x
x
x
x·
x
x
x
x
x
x

x
x
x
x

# £

Key Used To
Change Feature

[§]
[§]
I[§)

I]]
~

[]]
[]]
[§]
[]J
I]]

I]!
ffiandl!J

l:ZI

(]]

5. Type the message delimiter character. which is only required when
the answerback message is less than 20 characters. Once the message delimiter character is typed the answerback message will disappear from the screen.

2.1 .5

Saving SET-UP Features
Use the following procedure to save the current SET-UP feature settings in nonvolatile memory.
1. Place the terminal in SET-UP mode.
2. Press the SHIFT and S keys simultaneously. The screen will clear
and the message "Waif' will be displayed in the upper-left comer.
After a brief wait the terminal will return to SET-UP A mode.

2.1.6

Recalling SET-UP Features
Use the following procedure to recall the previously saved SET-UP
feature settings.
1. Place the terminal in SET-UP mode.
2. Press the SHIFT and R keys simultaneously. The screen will clear
and the message 'Wait'' will be displayed in the upper-left corner.
After a brief wait the terminal will return to SET-UP A mode.
NOTE
When a recall operation is performed the contents of the screen are
destroyed.

2.1.7

Resetting the Terminal
Use the following procedure to reset the terminal:

(shifted)

4. Type the answerback message, which may be up to 20 characters
long. including space characters. If the message exceeds 20 characters. the answerback message will disappear from the screen after
the 20th character is typed. In this case the message delimiter character described in the next step is not required.

t A special sequence is required for this feature (Paragrlph 2.1.4).
1. Place the terminal in SET-UP mode.

2.1 .4

Setting the Answerbadc: Message
Use the following procedure to set the answerback message:·

1. Place the terminal in SET-UP B mode.

2. Press the 0 key on the main keyboard. The VT100 will be reset. the
power-up self test will be run. and the terminal will react according
to the. fixed SET-UP features.

2. Press the SHIFT and A keys simultaneously. The terminal will
respond by placing A= on the screen. (The SHIFT key is required:
the CAPS LOCK key will not work here.)

3. Type the message delimiter character. which may be any character
not used in the actual answerback message. (The message delimiter
character is not a part of the answerback message.) If a mistake is
made while typing the answerback message. type the message delimiter character again and go back to step 2. This is the only way to
correct errors in the answerback message.

2-4

2-5

CHAPTER 3
TESTING THE VT100

3.1
INTERNAL SELF TESTS
The VTlOO contains three self-test programs in the basic ROM memory:

Power-up test
Data loopback test
Video adjust pattern
Each test is designed to isolate a failure to the faulty module so that
the terminal may be repaired in a minimum amount of time.

3.1.1

Power-Up Test

3.1.1.1 Description - The power-up self test performs the following
functions:
1. Writes a 1 and a 0 in each bit location of RAM on the basic terminal
controller board to verify that the RAM can store each bit.
2. Writes a 1 and a 0 in each bit location of RAM on the Advanced
Video Option (AVO) board to verify that the optional RAM can store
each bit. If the AVO board is not installed. this part of the test is
skipped.
3. Reads the contents of the nonvolatile (NVR) RAM. calculates a
checksum. and then compares the checksum to the checksum
stored in the NVR.
4. Reads the contents of each ROM chip·; calculates a checksum. and
then compares the checksum to the checksum stored in each ROM
chip.
5. Turns on all keyboard LEDs, rings the keyboard bell for one-quarter
second •. and looks for the end of scan character from the keyboard
to determine if the keyboard is functioning properly.

3-1

3.1.1.2 Performing the Test-The power-up test may be started in
any one of the following ways:

5. Type the following sequence to perform the test once;
ESC [2;2y

1. Turn the terminal power on.

or
type the following sequenc.e to .perform the test continuously.

2. Type the following sequence to perform the test once. (The terminal
must be in the ANSI-compatible mode. In SET-UP B group switch 3
equals a 1.)

ESC {2;10y
NOTE ..
The continuously running test will end only if an e~ror is found or the
power is turned off.

ESC (2;1y
or
3. Type the following sequence to perform the test continuously. (The
terminal must be in ANSI-compatible mode; in SET-UP B. group 2
switch 3 equals a 1.)
ESC [2;9y

4. Reset the terminal.
NOTE
The continuously running test will end only if an error is found or the
power is turned off.
Any error found by the power-up ,.5eif test will b8 displayed on the
terminal screen and/or LEDs L 1 through L4 on the keyboard. Tables 3-1
and 3-2 provide the meanings for the error codes.
Data Loopback Test

3.1 .3

Video Adjust Test·

3.1.3.2 Performing the Test - Use the following procedure to display the test pattern.
1. Place the terminal in ANSI-compatible mode (in SET~UP B group 2
switch 3 equals a 1 ).

2. Place the terminal in LOCAL mode.
3. Type thefollowing sequence
ESC #8

3:12.1
Description - In the data loopback test the VT100 tran5mit
and receive lines are connected via a special external connector. A predefined set of characters are then transmitted. The terminal receives the
characters and compares them to the characters transmitted. If the
characters do not match an error is then flagged.
3.1.2.2 Performing the Test - Use the following procedure to perform the data loopback test.
'

1 . Install the approiJriate data l0opback connector. (Connector part
number 12-15336 is for EIA communications; ·part number 7015503-00 is for 20 mA current loop communications.)
2. Ensure that the transmit and recei~e speeds are the same.
3. Place the terminal in ANSI-compatible mode (in SET-UP B group 2
switch 3 equals a 1 ).
4.

Any er:ror found by the da~ l~opback self. t~~t will be displayed on
the terminal screen. Table 3-2 provides the meanings of the error codes.

3.1 .3.1
Description - The video adjust test provides a full screen ..of
"'Es'" for the display height. width. and linearity adjustments. The test
pattern is internal to the terminal and is not sent to the host computer.

3 .1 .2

•

Place the terminal in ON-LINE mode.

3-2

3.1.4 Error Codes
If execution of any self-test produces an error. the test stops automatically. There are two broad categories of ·errors: fatal and nonfatal.
Fatal errors cause the terminal to immediately stop all operation., No
intelligible information is displayed on the scr:een; however. the screen
may not be blank, but will contain a random pattern of characters. The
only error indication (except the hung terminal) is a possible error code
displayed on the programmable keyboard LEDs (L 1 through L4); however. no terminal function. including the lighting of LEDs. is guaranteed
on a fatal error. The possible fatal errors and the LEO· codes are listed in
Table 3-1.
Table 3-1
Error
ROM 1 checksum error
ROM 2 checksum error
ROM 3 checksum error
ROM 4 checksum error
Main Data Ram error

LED Error Codes
L1
OFF
OFF
OFF
OFF
OFF

3-3

L2
OFF
OFF
OFF
ON
ON

OFF
ON
ON
OFF
OFF

ON
OFF
ON
OFF
ON

Nonfatal errors do not hait the terminal processor. Instead. the terminal is forced to LOCAL mode. and an error code character is displayed in
the upper-left comer of the screen under the blinking cursor.· Additionally, if one or more nonfatal errors occurred while the test was repeating
continuously. the entire screen would flash from white to black to white
about once per second as an alarm. This would continue until the terminal was reset. There are four types'of nonfatal errors:
1.
2.
3.
4.

CHAPTE'R 4
VIDEO ALIGNMENT

Advanced Video Option data RAM (AVO)
Nonvolatile data RAM checksum error (NVR)
Keyboard missing or malfunction (KBD)
Data loopback error ('Data)
"·

Table 3-2 shows the possible nonfatal error characters which may
appear Oh the screen and the failure Which each character represents.

Table 3-2
Displayed
Character
1
2
3
4
5
6
7
8
9
:

>
?

AVO

x
x
x
x
x
x
x
x

Displayed Error Codes

NVR

x
x

Fault Detected
KBD

_.• j•

x
x
x
x

x
x

This chapter describes the alignment of the video monitor. All of the
individual adjustments do not have to be performed each time the monitor is aligned: however.. each adjustment should always be checked
since many of the adjustments are interdependent.

Data
Figure 4-1 shows the alignment templates used in this procedure. If
the mylar adjustment templates are not available, reproduce the templates shown in Figure 4-1 on a separate piece of paper. Cut out the
shaded area on each and use these copies to perform the adjustments
in place of the mylar templates.

x
x
x
x

4:1 . ' G!~NERAL

x
x
x
x
x
x
x
x

Note: See Table 1-2 to determine the correct module to replace.

4.2 MONITOR ADJUSTMENTS
The following paragraphs describe the alignment of the video monitor. All adjustments must be made under the following conditions:
1.
2.
3.
4.

Normal video 'mode (~hite characters on. a dark background)
80 characters per line mode
ANSI-compatible mode
LOCAL mode.

4.2 .1
Brightness
Use the following procedure to adjust the brightness control on the
monitor board.

1. Increase the brightness to the maximum level with the '"t" key in
SET-UP mode.
3.2 USE OF THE PMK04 TESTER
The PMK04 tester is compatible with the VT100. Consult the
PMK04 Operator's Manual for instructions on how to use the tester.

2. Remove the terminal top cover (Paragraph 5.10)..
3. Adjust R117 (Figure 4-2) until the display raster is visible; then back
off on the adjustment until the rastM disappears.
4. Replace the terminal top cowr.

4-1
3-4

4.2.2 FOCUS
Use the following procedure to check and adjust the focus.
1 . Type the following sequence.
ESC #8

2. Examine the characters at the four comers and in the center of the
screen. The individual dots in the vertical segment of the "E" should
be visible in each character.

NOTES
In some cases. the operator may want the focus mlsadjusted to suit
personal preference.
If the focus is adjusted correctly do not perform the following steps.
3. Remove the terminal top cover (Paragraph 5.10). ·:
4. Adjust R122 (Figure 4-2) for the best overall character presentation.
5. Replace the terminal top cover if no further adjustments are required.

4.2.3 Yoke
Use the following proeedure to check'and adjust

the yoke.

1. Type the following sequence.
ESC #8

2. With the top cover still on the terminal. place the VT100 alignment
template (part number 940322-3) on the screen. Ensure that the
template lies as flat as possible on the screen.
3. Verify that all four sides of the display presentation are parallel to
the red shaded area of the alignment template.

NOTE
If the yoke is adjusted correctty do not perform the following steps.
4. Remove the alignment template from the screen.
5. With the dark blue or black felt-tip pen, mark the four edges of the
screen.
6. Remove the terminal top cover (Paragraph 5.10).
7. Tape the VT100 alignment template to the screen. To orient the
template use the felt-tip pen marks placed on the screen in step 5.
8. Loosen the yoke collar clamp screw (Figure 4-3) and turn the yoke
until the four sides of the display presentation are parallel to the red
shaded area of the alignment template.

4-2

- - . - - - - - - - - . - - - . .____________ _

RED
SHADED
AREA
MIN-........CHARACTER HEIGHT

·~

o•

MIN

MAX

0CC

MAX

.- v
1-N
>M
0
v
0)

CHARACTER WIDTH

VT100 9403246-38

--- ~-~---------------------------

VT100 ALIGNMENT TEMPLATE

9403220-3

MA-2069

RED SHADED AREA
Figure 4-1

Video Alignment Templates
4-3

J101

2. With the top cover still on the terminal. place the VT100 alignment
template on the screen. Ensure that the template lies as flat as
possible on the screen.

BAIGlfTNES

VERT. HOLD

FOCUS

VERT.
LINEARITY

B
Rl~

VERTICAL
HEIGHT

HOAZ
LINEARITY

J104

Figure 4-2

3. Verify that the top and bottom lines-of the. presentation are coVered
by the red shaded area of the adjustment template.

BVIDEO
CENTERING

NOTE
If the vertical height is correct do not perform the following steps.

HOAZ
WIDTH

® ®

4. Remove the alignment template from the screen.
0

5. With the dark blu1e or black felt-tip pen. mark ·the four edges of the
screen.

Video Monitor Board Adjustments
6. Remove the terminaf top cover (Paragraph 5. 10).

7. Tape the VT100 alignment template to the screen. To orient the
template use the felt-tip pen marks placed on the screen in step 5.
8. Adjust the vertical height using R110.
9. Check and adjust the vertfcal line·arity and vertical hold if needed.
10. Replace the terminal top cover if no further adjustments are required.

4:2.5

Horizontal Width
Use the following procedure to check and adjust the overall presentation width.
1. Type the following sequence.

ESC fl.8

YOKE COLLAR
CLAMP SCREW

2. With the top cover still on the terminal. place the VT100 alignment
Figure 4-3

CRT Adjustments

template on the screen. Ensure that the template lies as flat as
possible on the screen.

3. Verify that the first and last columns of the presentation are covered
by the red shaded area of the adjwstrnent template.

9. Ensure that the yoke is pushed all the way forward toward the face
of the CRT. While holding the yoke in place. tighten the yoke collar
clamp screen.

'NOTE··
If the horizontal width is correct do not perform the following steps.

10. Replace the terminal top cover if no further adjustments are required.

4.2.4

Vertical Height
Use the following procedure to check and adjust the overall presentation height.

4. Remove the alignment template from the screen.
,,
),

5. With a dark blue or black felt-tip- pen. mark the four edges of the
screen.

6. Remove the terminal top cover (Paragraph 5.10).

1. Type the following sequence.

7. Tape the VT100 alignment template to the screen. To orient the
template use the felt-tip marks placed on the screen in step 5.

ESC #8

4-4
4-5

8. Adjust the horizontal width usrng l103.

9. Check and adjust the horizontal linearity if needed.

2. Using the VT100 character height template (part number 9403246-38) verify that the characters located near the four corners
and the center of the presentation fall between the minimum and
maximum units of the template.

10. 'Replace the terminal top· cover.

4.2.6

Centering
Use the following procedure to check and adjust the presentation
centering.

NOTE
If the vertical linearity is correct do not perform the following steps.
3. Remove the terminal top cover (Paragraph 5.10).
4. Adjust the vertical linearity using A 102.

1. Type the following sequence.

5. Check and adjust the vertical height and vertical. hold rt needed.

ESC #8
2. With the top cover stitl on the terminal, place the VT100 alignment
template on the screen. Ensure that the template lies as flat as
possible on the screen.

6. Replace the terminal top cover if no furt~r adjustments are required.

4.2.8

3. Verify that the display presentation falls within the red shaded area
on the alignment template. If the presentation is too large or toe>
small perform the appropriate width or height adjustment.

Horizontal Linearity
Use .the following procedure to check and adjust for uniform character width.
1. Type the following sequence.

NOTE
If the centering is correct do not perform the following steps.
4. Remove the alignment template from the screen.
5. With a dark blue or black felt-tip pen, mark the four edges of the ·
screen.

6. Remove the terminal top cover (Paragraph 5.10).
7. Tape the VT100 alignment template to the screen. To orient the

ESC #8
2. Using the VT100 character width template (part number 9403346-3A) verify that the characters located near the four corners
and the center of the presentation fall between the minimum and
maximum limits of the template.

NOTE
If the horizontal linearity is correct do not perform the following
steps.

template use the felt-tip pen marks placed on the screen in step 5.
3.

Remove the terminal top cover (Paragraph 5.10).

8. Set A 103 fully counterclockwise.
4. Adjust the horizontal linearity using L 102.

9. Center the presentation by rotating the centering tabs on the yoke
(Figure 4-3).

5. Check and adjust the horizontal width if needed.
6.

Replace the terminal top cover if no further adjustments are required.

NOTE
A103 may be used to move the display presentation a small distance horizontally. If A 103 is misadjusted, the left side of the screen
presentation may be distorted.

4.2;9

10. Replace the terminal top cover ·if no further •adjustments are· required.

1. Remove the terminal top cover (Paragraph 5.10).

4.2.7

Vertical Linearity
Use the following procedure to check and adjust for uniform character height

2. Set A 101 fully counterclockwise.

1. Type the following sequence.

4. Replace the terminal top cover if no further adjustments are required.

Vertical Hold
Use the following procedure to adjust the vertical hold.

3. Check and adjust the vertical height and vertical linearity if needed.

ESC #8

4-6

4-7

CHAPTER 5
MODULE REMOVAL AND REPLACEMENT

6.1 GENERAL
This chapter. contains procedures for the removal and replacement of
the mechanical subassemblies of the VT100.
Figure 5-1 lists all removal procedures in this chapter and the sequence in which they are to be performed. As an example. Figure 5-1
illustrates that to remove the de power harness. the top cover. bottom
cover. and power supply removal proce'dures must be performed first.

6.2 ACCESS COVER
The following procedure describes the removal and installation of the
terminal access cover.
1 . Remove power from the terminal by disconnecting the ac plug.
2. Unplug the keyboard.
3. Unplug the connectors from the video input/output jacks.
4. Disconnect the communications cable.
5. With a blade-type screwdriver loosen the four captive screws holding the access cover (Figure 5-2).
6. If the 20 mA Current Loop Option is installed, gently pull the access
cover away from the terminal about two inches: then reach in and
disconnect J5 from the terminal controller board.
7. Remove the access cover.
8. To install the access cover. perform steps 1 through 7 in reverse.

6.3 TERMINAL CONTROLLER BOARD
The following procedure describes the removal and installation of the
terminal controller board.
1. Perform the terminal .access cover removal procedure (Paragraph
5.2).

5-1

4. Grasp the advanced video board by its edges near the connector
and gently but firmly lift the board straight up and off the terminal
controller board.

6.8 KEYBOARD CABLE
The following procedure describes the removal and installation of the
keyboard cable.

5. To install the advanced video board. perform steps 1 through 4 in
reverse.

1. Perform the keyboard top cover removal procedure (Paragraph 5.6).
2. Perform the keyboard removal procedure (Paragraph 5.7).

6.6 20 mA CURRENT LOOP BOARD
The following procedure describes the removal and installation of the
20 mA Current Loop Board.

3. Disconnect the keyboard cable from the speaker.
4. Remove the keyboard cable.

1. Perform the access cover removal procedure (Paragraph 5.2).
5. To install the keyboard cable. perform steps 1 through 4 in reverse.
2. With a Phillips head screwdriver. remove the two screws holding
the Mate-N-Lok connector to the bottom of the access cover.
3. With a Phillips head screwdriver. remove the three screws holding
the 20 mA Current Loop Board to the access cover and remove the
board.
-KEYBOARD
CABLE

4. To install the 20 mA Current Loop Board. perform steps 1 through 3
in reverse.
6.8 KEYBOARD TOP COVER
The following procedure describes the removal and installation of the
keyboard cover.
1. Remove power from the terminal by disconnecting the ac plug.
2. Unplug the keyboard from the monitor.
3. Tum the keyboard over so that the keycaps are face down; then
place the keyboard on a flat surface.
4. With a blade-type screwdriver. loosen the captive screws holding
the keyboard together (Figure 5-4).
5. Grasp the entire keyboard assembly and turn it right side up.
6. Remove the top cover by lifting it straight up.
7. To install the keyboard top cover. perform steps 1 through 6 in
reverse.
6.7 KEYBOARD
The following procedure describes the removal and installation of the
keyboard.

Figure 5-4

Keyboard Disassembly

1. Perform the keyboard top cover removal procedure (Paragraph 5.6).

5.9 KEYBOARD SPEAKER
The following procedure describes the removal and installation of the
keyboard speaker.

2. Disconnect keyboard cable J2 from the keyboard.

1. Perform the keyboard top cover removal procedure (Paragraph 5.6).

3. Remove the keyboard.

2. Perform the keyboard removal procedure (Paragraph 5.7).

4. To install the keyboard perform steps 1 through 3 in reverse.-

3.· Perform the keyboard cable removal procedure (Paragraph 5.8).

5-4

5-5

4. Remove the speaker by sliding toward. the front edge of the keyboard cover.
5. To install the keyboard speaker. perform steps 1 through 4 in reverse.

6.10 TOP COVER
The following procedure describes the removal and installation of the
terminal top cover.
1. Remove power from the terminal by disconnecting the ac plug.
2. Unplug the keyboard.

3. With a small blade-type screwdriver release the two front pop fasteners located under the front lip (Figure 5-5a).
4. With a small blade-type screwdriver release the two rear pop fasteners located on the lower-rear edge of the bottom cover (Figure
5-5b).

Figure 5-5a
Top Cover Removal
(Front View)

POP FASTENERS 12)

5. Remove the top cover by lifting straight up.
6. To rnstall the top cover. perform steps 1 through 5 in reverse.

6.11
VIDEO MONITOR BOARD
The following procedure describes the removal and installation of the
video monitor board.
1. Perform the top cover removal procedure (Paragraph 5.10).
2. Remove the circular connector from the base of the CRT (Figure
5-6).

Figure 5-5b
Top Cover Removal
(Rear View)
POP FASTENERS 12)

3. Disconnect the four wires from the yoke connection card.
STANDOFFS 14)

Tab 1 - Yellow
Tab 2 - Red
Tab 3 - Blue
Tab 4 - Brown
4. Disconnect 4-wire connector J102. located at the bottom of the
video monitor board.

TAB 1

5. Disconnect 7-wire connector J104, located at ihe bottom-center of
the video monitor board. Move the harness up and out of the way.
6. Disconnect the in-line connector on the green ground wire.
7. Disconnect video input cable J101 from the top edge of the video
monitor board.
8. Release the four standoffs and remove the video monitor board:
9. To install the video monitor board perform stepS- 1 througtl 8··in
reverse.
5-6

CIRCULAR BASE
CONNECTOR

Figure 5-6

Video Monitor Board Removal•.

6.12 FLYBACK TRANSFORMER
The following procedure describes the removal and installation of the
flyback transformer.
WARNING
This procedure deals with the CRT anode which may contain ·a
stored high voltage. Refer to step 3 for the anode discharge procedure.

6. To install the flyback transformer•.perform steps 1 through 5 in reverse.

6.13 BOTTOM COVER
The following procedure describes the removal and installation of the
terminal bottom cover.
1. Perform the top cover removal procedure (Paragraph 5.10).

1. Perform the top cover removal procedure. (Paragraph 5.10).

2. Disconnect the power cord from the terminal.

2. Disconnect 7-wire connector J104. located at the bottom-center of

3. Release the two front pop fasteners holding the frame to the base
by pulling the plunger up.

the video monitor board. Move the harness up and out of the way
(Figure 5-6).
3. Discharge the high voltage contained at the CRT anode by gently
slipping the end of an insulated-handle screwdriver under the plastic
anode cap on the top of the CRT while shorting the other end of the
screwdriver to a nonpainted metal area of the CRT frame (Figure
5-7).

4. Release the two rear pop fasteners holding thfJ/frame to the base by
pulling the plunger up.
5. Grasp the metal frame and lift the frame up and out of the terminal.
6. To install the bottom cover perform steps 1 through 5 in reverse.

6.14 POWER SUPPLY
The following' procedure describes the removal and installation of the
power supply.

1. Perform the top cover removal procedure (Paragraph 5.10).
2. Perform the bottom cover removal procedure (Paragraph 5.13).
3. Release the three pop fasteners on the side of the chassis by pulling
the plungers out (Figure 5-8).

Figure 5-7

CRT Anode Discharging

CAUTION
Do not scratch the CRT glass when discharging the CRT anode.
4. Disconnect the heavy red CRT anode wire from the CRT.
POP
FASTENERS

5. Using a 1/4 inch nutdriver. remove the two nuts mounting the flyback transformer to the horizontal cross brace and remove the
transformer.

CAUTION
The ·nyback transformer ferrite material is brittle. Exercise care
when handling the transformer.
Ferrite is a conductive material. Remove any pieces that might fall
into the chassis to eliminate any possibility of an electrical short.

5-8

Ftgure 5-8

Power Supply Removal

5-9

WARNING
Capacitors C9. C14. and the surrounding circuits contain a 300 Vdc
charge. To discharge the capacitors. leave the power supply
plugged into the terminal for a minimum of four minutes after the
power cord' is removed.
To ensure complete discharge of the capacitors short the capacitors
with an insulated wire as shown in Figure 6-9.

5. Remove the two fasteners hofding the 22-pin edge connector to the
card cage and then remove the connector.

6. Remove the two fasteners holding the 18-pin edge connector to the
chassis and then remove the connector.

7. Remow the de power harness.
8. To install the de power harness. perform steps 1 through 8 in reverse.

CAPACITORS
C9 Ii C14

POP FASTENERS (2)

Figure 5-9

Power Supply Capacitor Discharging

HARNESS

4. Grasp the power supply by the end plate and remove the power_
supply by pulling it straight out.

Figure 5-10

DC Power Harness Removal

5. To install the power supply perform steps 1 through 4 i,n reverse.
6.15 DC POWER HARNESS
The following procedure describes the remova·I and installation of the
de power harness.
1. Perform the top cover removal procedure (Paragraph 5.1 O)~,
2. Perform the bottom cover removal procedure (Paragraph 5.13).
3.

Disconnect 10-pin edge connector J101 from the video monitor
board (Figure 5-10).

6.16 FIELD SERVICE CRT MONITOR ASSEMBLY
The-.CRT is not designated a replaceable item; it should only be replaced as part of the Field Service CRT monitor assembly due to the
lack of adequate protective equipment. The following procedure describes the removal and installation of the Field Service CRT monitor
assembly.
WARNING
High voltage, may be present et the CRT anode. See Paragraph
5.12, step 3 for the anode discharge procedure.

4. Remove the card cage by releasing the two pop fasteners holding
the top of the card cage to the chassis. Tilt the card cage top out .
slightly and then lift the card cage out of the bottom holding clips.

1. Remove the card cage by releasing the two pop fasteners holding
the top of the card cage to the chassis. Tilt the cage top out slightly
and then lift the card cage out of the bottom holding clips (Figure
5-10).

5-10

5-1'1

2. Remove the two fasteners holding the 18-pin edge connector to the
chassis and then remove the connector.
3. Replace the Field Service CRT monitor assembly.

WARNING

Do not strike the CRT: this can cause the tube to implode.
4. To' instalt the ·Field ·Service CRT monitor assembly. perform steps 1
through 5 in reverse.
1

CHAPTER 6
VT100 OPTIONS

6.16.1 CRT Storage and Disposal
All CRTs should be stored in the closed shipping container. Any CRT
which has failed must be destroyed. Destruction of the CRT will prevent
liability and safety problems.
The proper procedure for destroying the CRT is as follows:
1 . Place the defective CRT assembly in the replacement parts shipping
container and seal the container. Be sure to mark the side of the
container that corresponds to the face of the CRT.
2. Return the defective CRT assembly to the local service office.
3, Locate the face of the CRT in the sealed container. Using a hammer.
drive a screwdriver or similar tool through both the shipping container and the face of the CRT.
4. Dispose of the shipping container with the CRT in the normal manner.

6.1 GENERAL
This chapter contains detailed descriptions on how to install and
check out the Advanced Video Option and the 20 mA Current Loop
Option.
6.2 ADVANCED VIDEO OPTION
The Advanced Video Option adds the following features to the Basic
VT100:
Capability of 24 lines of 132 characters each
Capability of using an alternate character set provides additional
character attributes.

6.2.1 Advanced Video Option Installation
Use the following procedure to install the Advanced Video Option:
1. Remove the terminal access cover (Paragraph 5.2).
2. Remove the terminal controller board (Paragraph 5.3).
3. Place the terminal controller board on a flat surface with the component side up.
4.. Place a standoff in each of the four mounting hates in the terminal
control board (Figure 6-1 ).
5. Align advanced video connector J1 and.mount the advanced video
board on the standoffs.
6. Reinstall the terminal controller board and terminal access cover.

6.2.2 Advanced Video Option Checkout
Use the following procedure to check out the operation of Advanced
Video Option:
1. Tum the terminal power on and verify that no error was detected
. during the power up self-test.

5-12

6-1

COMPONENT
SIDE OF
TERMINAL
CONTROLLER

CAPTfVE
SCREWS (4)

ADVANCE

VID:~D
eo

STAHOOFF$ ,.,

J1 ADVANCE

,.__ _ _ .ACCESS

VD /l~/BO~RD

ONNECTOR

II=;

i
'-,

COVER

J2 GRAPHICS

'l"ERMINAL
CONTROLLER

JS 20mA
CURRENT LOOP
CONNECTOR

. !r:::::::::1

20mA
CURRENT
TOP BOARD

J4 EIA
COMMUNICATIONS
CONNECTOR

TRANSMIT
LINE
SWITCH

JB VIDEO IN
CONNECTOR

RECEIVE
LINE
SWITCH

J9 VIDEO out
CONNECTOR
J7 KEYBOARD
CONNECTOR

Figure 6-1

Advanced Video Option Installation ,

2. Press the SET-UP key. The words "SET-UP A" should blink in bold
face. the words "TO EXIT PRESS SET-UP" should be underlined.
and the ruler should contain alternating normal and reverse video
fields.
3. Place th~ terminal in 132 column mode and then in LOCAL mode.'
4. Exit SET-UP ,and type the following sequence:
ESC < ESC #8
The screen should now display 24 lines X 132 columns.
6.3 20 mA CURRENT LOOP OPTION
The 20 mA Current Loop Option allows the terminal to communicate
directly with the computer over short, distances without the use of a
modem.
6.3.1
20 mA Current Loop Option lns1811ation
Use the following procedure to install the 20 mA Current loop Option.

1. Remove the terminal access cover (Paragraph 5.2).

6-2

Figure 6-2

20 mA Current Loop Option

2. Place the new terminal access cover containing the 20 mA current
loop card down on a flat surface.
3. Set the TRANS switch to the NORMAL position (Figure 6-2). (If the
terminal must provide current on the transmit line set the switch te>
the ACT position.)

4. Set the REC switch to the NORMAL position (Figure 6-2). (If the
terminal must provide current on the receive line set the switch to
the ACT position.)
5. Connect P5 to J5 on the terminal controller board (Figure 6-1 ).

6. Install the terminal access cover containing the 20 mA Current Loop
Option in place of the old access cover.

7. Connect the communications line to the Mate-N-Lok connector
located on the bottom of the access cover.

6-3

8.3.2

20 mA Current loop Option Checkout

Use the following procedure to check out the 20 mA Current Loop
Option.
1 . Disconnect the terminal from the communications line.

2. Remove the terminal access cover containing the 20 mA current
loopback board and place one of the switches in the ACT position.
The other switch must be in the NORMAL position. Reinstall the
access cover.
3. Connect the 20 mA loopback connector (PN 10-15503-00) to the
Mate-N-Lok connector mounted to the bottom of the access cover.

CHAPTER 7
PHYSICAVFUNCTIONAL
BLOCK DIAGRAM

4. Perf<>f'm the data loopback test (Paragraph 3. 1.2.2).
5. Once the test is completed return the 20 mA current loop board
switches to the original positions. remove the loopback connector.
and reconnect the terminal to the communications line.

6-4

7-1

POWER SUPPLY ASSEMBLY PIN 70-14979

P101r::Pl~N~5:--_-G_R_O_U_N_D____

PIN 6 - HORIZ. DRIVE
PIN 7 - +12 voe
PIN 8 - VIDEO
PIN 9 - VERT. DRIVE
PIN 10 - GNO

LINE CORD
3A FAST BLOW

11 S V USA 1700083-09
230V USA ,1700083-10

POWER CORD COLORS
ARE AS FOLLOWS

VIDEO
MONITOR
BOARD PIN
30-14590-02-

VOLTAGE, 116V i230V

VERT. HOLD

A1011
PIN 1 GND
PIN 2 +12 voe
PIN 3 +12 voe
PIN 4 GND
PIN s-12 voe
PIN 6 -23 voe
PINS 8-13 GND
PINS 14-18 +s voe

VERT.
LINEARITY
IA102

+12 v

ITT VERTICAL

JS
PIN 1 PROT. GND
PIN 2 TRANSMIT
PIN 3 +12 voe
PIN 4 RECEIVE
PIN S SIG. GND
PIN 6 +s voe
PIN 7 -12 voe

~HEIGHT

F---------------,J1
!

1 ADVANCED
: VIDEO
: OPTION
PIN 54-13097

GRAPHICS
CONN
J2

2 •• 1

0 7
II o 9 +s v

I _______________
41\
42 GND
J
~

S0°

STANDARD
TERMINAL
39 r---PO.;;..R;.;..T;.;..(:.;;S..;..T:....:Pl_ 1
40l
J3

20MIL
CONN JS

TERMINAL
CONTROLLER
MODULE
PIN 54-13009

PIN 1 HORIZ. DRIVE
PIN 2 GROUND
PIN 3 VIDEO
PIN 4 VERT. DRIVE
PIN 7 +12 voe

EIA

iTm SELFTEST
bl!.!JCONN
PIN 12-1 S336

+12 v
GND

20 mA
LOOP 9ACK
CONNECTOR
PIN 70-15503-00

KEYBOARD

lR_IDA_N's_N;: oR=:=~ =[fil=§~o

.....

PIN 8 GND
PIN 9 -12 voe
PIN 10 -23 voe
PINS 13-17 GND
PIN 18-22 +s voe

n
u

DATA-- r---t

rP_INS'j;'.70~-w1~5_7~65==--=---=---=------r--r---~ ~'1~~~5lJ2
SET-UP

20MIL
OPTION
PIN 70-15273

EIA
COMMUNICATIONS
CABLE
PIN BCOSD-10

FIELD SERVICE
CRT MONITOR
ASSY PIN
70-16187

GND
GREEN GRN/YEL
NEUTRAL WHITE BLUE
HOT
' BLACK BROWN

F1 FUSE PIN 90-07217
S1 SWITCH PIN 12-1S232
S2 SWITCH PIN 12-1 4 lSS-03

0 0

- -

J2 (KEYBOARD)

J4 (CONTROLLER)

PIN 1 - SPEAKER
PIN 2 - SPEAKER
1
PIN 3 - +12 voe
PIN 4- GND
PINS- DATA

PIN 1 PORT GNO
PIN 2 TRANS DATA
PIN 3 REC DATA
PIN 4 RTS
PIN S CTS
PIN 6 DSR
PIN 7 SIG GND
PIN 8 CD
PIN 9 Pin lO PIN 11 SPEED SEL.
PIN 12 SI
PIN 13 -

7-3

20 mA CURRENT LOOP
COMMUNICATIONS
CABLE
P/N BC05F _15

PIN 14 _
PIN 15 TRANS CLK
PIN 1 6 _
PIN 17 REL CLK
PIN lS _
PIN 19 SPEED SEL
PIN 20 DTR
PIN 21 PIN 22 RI
PIN 23 SPEED SEL
PIN 2 4 _
PIN 25 _

l
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