Tektronix 4112 User manual

TE
. K"
SERVICE MANUAL
· VOLUME 2
•
•
First Printing SEP 1982
•
4112
Part No. 070 - 3819-00
Product Group 16
COMPUTER DISPLAY
TERMINAL
Please Check for
CHANGE INFORMATION
at the Rear of this Manual
Tektronix·
COMMTTUJ TUCXCELL£NCC

WARNING I
THE FOLLOWING SERVICING INSTRUCTIONS ARE
FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID PERSONAL INJURY, DO
NOT PERFORM ANY
SERVICING OTHER THAN THAT CONTAINED IN
OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
Copy rig ht @ 1982 by Tektro nn<. Inc. Bec .vert on Oregon
Pr i nted in the United Sta t es 'Jf Ame rica A ll rig hts reserved
Con te nts of thi s pub li ca tion may not be reproduced in any
form w ith ou t per mi ss ion of Tektro ni x. inc
Th is i nstrumen t. 1n who le or m part . m ay be protected by ori e
or more U.S. or foreign patents or pate nt app l1 ca ·• ons
I nformat ion prov i ded on re q uest by Tek tro nt.< . I nc
0 O Bo •
500 . Beaverto n. Orego n 97077
TE KTRONIX is a reg i stered trademark of Tek lr on • '' <.
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MANUAL REVISION STATUS
•
PROD U CT : 411 2 COM PUTER £:>1SPLAY TERMINAL
This manual supports the following versions of this product : Serial Numbers 8010100 and up .
REV DATE DESCRIPTION
sen 1ee2
Original Issue; repl ac es 061 ·2487· 00 .
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:
I
I
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• 411 2 SERVICE (VOLUME 2)

• CONTENTS
Section 1 INTRODUCTION Page
Using
This Manual .............. .. . .... . ............ . ... 1-1
Controls and Connectors Summary
.... . ... . .... . ........ 1-2
Internal Configuration..
................. . .. . ..... . ..... . 1-3
Accessories .......... . ................. . .... . .. . .. ... .. 1 -5
Standard Accessories ... . ........... .. .. . ............ 1-5
Op tional Accessories .. . ............ .. ........... ... . 1-5
Section 2 INSTALLATION
Unpacking the Terminal ...... . ......................... 2-1
Site Se lection ........ ..... ................ .. ..... . ..... 2-2
Installation Procedures .......................... .... ... 2-4
Checking for Correctly Installed Opti ons
and Proper Operating Voltage .. . ................ . .... 2-4
Applying Power .............................. ... ... .. 2-4
Testingthe Terminal (Self-Test) .... . ....... . ....... . . 2-4
• Connecting
to a Host Computer ....................... 2-6
Direct Connection
....................... . ... . ..... 2-6
Telephone Line Connecti on ...... .. ...... . .... . .... 2-6
Testing Communications
............................. 2- 7
Repackaging the Terminal
........ ... .. .......... . ...... 2-8
Section 3 STP.AP INFORMATION
ProcessC1r Board Straps .............. .. . ................ 3-1
Keyboard Straps
...................................... . 3-2
RAM/ROM and RAM Controller Board Straps ............. 3-2
Vi deo ControllerBoard Straps ........................... 3-2
V ec tor Generator Board Straps ........ . ................. 3-4
Raster Memory Board Straps ........................... . 3-4
Dual P lan e Raster Memory Board Straps ................. 3-4
External Video Board Straps ............................ 3-4
Section 4 ADJUSTMENTS (Short
Form) .. ... .. . .... ...• . ........ . 4-1
•411 2 SERVICE (V
OLUME 2)
ii

iii
S.Ctlon 5
Section e
S.Ctlon 7
S.Ctlon 8
S.C:Uon9
Appen dix A
Appendix&
TROUBLESHOOTING AND SELF-
TEST
•
Introduction to Self-Test . . ....................... . ...... 5-1
Parts
of Self- Test .................................... 5-1
Power-Up
......................................... 5-1
Main Self-Test
.................................... 5 -2
Adjustment Rou ti ne ............................... 5-2
7x System Errors Dete ctor ......................... 5 -2
Control Fl ow of Self-Test ................... ......... .5 -2
Se lf -Test Firmwa re JumpTables. ....... .... ... . .... .. 5-5
How to Run Self-Test ............. .... . ........... . .. 5-5
Self-Test Error Messages
............ . .................. 5-6
E rr .ors D ir ectory .......................... ........ . .. . 5-6
Non-Option Error Messages ............ ..... .. ....... 5-6
Keyboard Check and Lights
....... ........... ..... 5-7
Processor
Chtkk ... ... .............. ........ ..... .5-1 o
Communications and Bus Checks ..... ... ... .. ..... 5- 14
MemoryTests ....................... ..... .. ....... 5-17
Di sp lay Bus Checks............ . .......... ... .... 5-23
System Level Errors (7x) ................ .. . ... . ...... 5-25
41 12 Option Tests and Error Messages .... ....... .... 5 -27
3PPI Board Tests ................................. 5 -2 7
Option 42 Self-Test Error Messages
..... .. ......... 5- 29
Tablet Self-Test ........................ ....... .... 5- 37
Adjustment Sel
f- Test ........ ... ........ ................ 5-40
The General Menu ..................... .............. 5-40
411 2 Di sp lay Adjustment Menu .......... ...... . .. .... 5-41
Processor Board Adjustment Menu/Procedure
........ 5-41
CMOS-Reset.
..... ... ........... . ................. 5- 41
•
Keyboard ......... .. .... . ................ ... . .. .. . 5-42
Host Port ............ . ............... ......... . .. . 5-42
Di sk Op ti on Ad justment Menu/Procedure ....... ...... 5-43
3PPI Ad ju stment Menu/Procedure ......... .. ......... 5-43
Tablet Adjustment Menu/Procedure ......... ..... . .... 5-44
ELECTRICALPARTS LIST
DIAGRAMS
SCHEMATICS
MECHANICALPARTS LIST
SIGNALS UST
ASCII CODE AND KEYCODE CHARTS
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41 12 SERVICE (VOLUME 2)

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ILLUSTRATIONS
Figure Description
Page
1-1 The
4112 Computer DisplayTerminal ........... ... ix
1-2 Front and Rear Panel Features ... ... ... .......... . . 1-2
1-3 4112 Internal Layout .. .... . ................ . .... .. 1-3
1 -4 411 2 MotherBoard ........ . .......... . .. . .. . ..... 1-4
2-1 4112 Physical Dimensions .................. . ..... 2-3
2-2 SELF TEST and MASTER RESET Buttons
2-3
2-4
3-1
5-1
5-2
5-3
5-4
5-5
5-6
5-7A
5-78
5-7C
5-7D
5-7E
5-7F
5-7G
5-7H
5-71
5-7J
5-7K
4112 SERVICE (VOLUME 2)
and Rear Panel Connectors ........................ 2-5
Keyboard Key Codes
.. . .... . ................ . .... . 2-7
Repackaging Diagram
............................. 2-9
Strapping
RAM Controller Board Base Address . .... 3-3
Self-Test Functional Diagram ... .. . ....... ......... 5-1
Self-Test Program Block Diagram
.... .... .......... 5-3
Pointerand JumpTableDiagram ................... 5-5
RAM/ROM Board ROM Locations ................ .. 5-8
Processor Board ROM Locations .. . ............... . 5-12
Status Byte
......... ....... . .................... .. 5-17
Self-Test Flow Chart
.... .... .................. .... 5-45
Self-Test Flow Chart ... . ...... . ................... 5-47
Self-Test FlowChart
... . ..... .. .. .. . .... ... ....... 5-49
Self-Test FlowChart ......... . .......... ... ....... 5-51
Self-Test FlowChart
..... . ........... . .. . ... ...... 5-53
Self-Test Flow Chart ....... .. ...... . .. .... . ...... . 5-55
Self-Test Flow Chart .............................. 5-57
3PPI Self-Test Flow Chart ............. . .......... . 5-59
Di sk Self-Test Flow Chart .......................... 5-61
DiskSelf-Test Flow Chart
... .. .............. . .. .. .. 5-63
TabletSelf-Test Flow Chart ... . ............ ... .... . 5-85
iv

\J
Number
3-1
3-2
3-3
3-4
4-1
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-a
5-9
5 -1 0
5-
11
5-12
5-
13
5-1 4
5
-1 5
A -1
B- 1
B-2
8-3
B-4
B-5
B-6
B-7
8-8
8 -9
B- 10
TABLES
Descr i ption
Page
Pr oc essor Board Str ap Settings. ........ . ........ .. 3-1
Keyboard Language Option Straps
.............. ... 3-2
Video Co ntro ll er Strap Setti ngs ...... . ........... .. 3-2
External Video Straps . . . ... . ................ . ... .. 3-4
Display Module Adjustments.. .. .. ....... . ....... .. 4-1
Power-Up/S_elf-Test Sequen
ce .. .. ..... . .... ..... .. 5-4
Se lf-T estErrors Directory . ... . ...... . ..... ..... . . 5-7
Keyboard/Processor Board Errors .. .. .. ....... .... 5-9
Processor Board Err ors . ...... ... .... ...... . .. .... . 5-1 0
RAM/Bus and HostPort Errors
.. . ..... ... .. . .. ..... 5-14
H e~- to-Dec i mal Eq uivalents .... . .......... .. . ... .. 5- 17
System/Opt
io n ROM Err ors .... . .. . ..... .. .. . .... .. 5-18
RAM Test:Errors . ... . . . . . . .. . .. . .. .. . .. .... ..... 5-20
CMOS MemoryEr ro rs .. .. . ... .. . .. . .... .. .. .... . .. 5-22
Display Bus/Board and System Errors. .. .... .... . .. 5-23
System Level Errors (7x Codes) .. .. .. .... ....... . .. 5-25
3PPI Errors . .. .. .... . ................ . .... . .... ... 5-27
Disk Option Errors ...... .. . .... ..... ... .. . ........ 5-29
Tablet Error Messages . .. .. ... .. .... ... ... . ....... 5-37
Adjustment Control Keys .. . ..... .. .. . ............. 5-40
41 12 Signal Lis ~ ..... .... ..... ... .. ... .. ... . ...... A-1
ASCII Code C ~ art .. .... . .. . ... .... ...... . .. . ...... B-1
Characters used in <Char> Parameters ....
.... ... 8-2
Characters used in < Int> and
<In
t+ > Parameters .. .. . ...... . ................ .. B-3
Characters used
in <Int-Report> Pa rameters .... .. B-4
Characters used in <
XY> Parameters ............. B-5
Characters used
in < XV-Report> Parameters.. ... . B-6
Un ited Kingdom Character Set. .. . ....... . ......... B-7
Swedish CharacterSet ....
... . .. . ........ . .. . ... .. B-8
Dan ish/ Norwegian Character Set . ... . ............. B-9
APL Character Set .. ..... .. ... . .... .. ... .. ...... .. B-10
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411 2 SERVICE (VOLUME 2)

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OPERATORS SAFETY SUMMARY
This general safety information is for both operating and servicing personnel. Specific warnings and cautions will be
found throughout the manual where they apply. but may not appear in this summary.
TERMS
IN THIS MANUAL
CAUTION statements identify conditions or practices
that can result
in damage to the equipment or other
property.
WARNING statements identify conditions
or practices
that
can result in personal injury or loss of life.
AS MARKED ON EQUIPMENT
CAUTION indicatesa personal injury hazard not imme-
diatelyaccessible asone reads the marking.
or a
hazard to property i ncluding the equipment it self.
DANGER indicates a personal injury hazard immediate-
ly accessible as one reads the marking.
SYMBOLS
IN THIS MANUAL
A Thissymbol indicates where applicable caution-
~ ary or other information is to be found.
AS MARKED ON EQUIPMENT
~ DANGER high voltage.
@ Protective ground (earth) terminal.
A ATTENTION-refer to manual.
(D Refer to manual.
POWER SOURCE
This product Is designed to operate from a power
source that does not apply morethan 250 volts rms
between the supply conductors
or between ei~her
supply conductorandground.A protective ground
connection by way
of thegrounding conductor in the
poworcord is essential for safeoperation.
4112 SERVICE (VOLUME 2)
GROUNDING THE PRODUCT
This product is grounded through the grounding
conductor of the powercord. To avoid electri ca l shock .
plug
the powercord into a properly wired receptacle
before connecting to the power input or output termi-
nals .A protective ground connection by way of the
grounding condu~tor in the power cord is essential for
safeoperation.
DANGER ARISING FROM LOSS OF
GROUND
Upon loss of the protective-ground connection,all
accessible conductive parts (including knobs and
controls
that may appearto be insulating) can render
an electric shock .
USE THE PROPER POWER CORD
Use only the power cord and connector specified for
your product.
Use onlya powercord that
is in good cond ition.
Refer cord and
connector changes to qualified service
personnel.
vi

OPERATOR'S SAFETY SUMMARY
USETHEPROPERFUS E
To avoid fire hazard, use only the fuse spe cifi ed in the
parts
list fo r your pro.;juct, and wh ich is i dent ic al in
type, voltage rati
ng , and cu rre nt rati ng .
Refer fuse replacement
to Qua l i ~ied service personnel.
DO NOTOPERATE IN EXPLOSIVE
ATMOSPHERES
To avoidex plo sion. do not operate this product in an
atmosphere
of explos i ve gases u nl ess it has been
spec if ic all y certified fo r such operation.
vii
DO NOT nEMOVE COVERS OR PANELS
To avoid personal injury, do not remove the product
covers or panels. Do
not operate the product without
the covers and panels properly installed .
DO NOT OPERATE PLUG-IN UNIT
WITHOUT COVERS
To avoid personal inju ry, do not op6rate this product
wi thou t covers or pa ne ls i nstalled . Do not apply po wer
to the plug-in via a plug-in extender .
4112 SERVICE (VOLUME 2)
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SERVICE SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary.
DO NOT SERVICE ALONE
Do not perform internal service or adjustment of this
product unless another person capable
of rendering
first aid and resusc it ation is present.
USE CARE WHEN SERVICING WITH
POWER
ON
Dangerol!S voltages may e xist at several points in this
product.Toavoid personal injury,
do not touch exposed
connections and components while power is on.
Disconnect power
before removing the powersupply
shield,soldering,
or replacing components.
DO NOT WEAR JEWELRY
Remove jewelry prior to servicing.Rings,necklaces,
and other metallic objects could come into contact with
dangerous voltages
and currents.
4112 SERVICE(VOLUME 2)
X-RADIATION
X-ray emission generated within this instrument has
been sufficiently shielded. Do
not modify or otherwise
alter the high voltage circuitry or the CRT enclosure.
POWER SOURCE
This product is intended to operate from a power
sourcethat will not
apply more than 250 volts rms
between the supply conductors or between either
supply conductor and ground. A protective
gr ound
connection by way of the grounding conductor in the
power
cord is essential for safe operation.
viii

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38 1 7-114
Figure1-1. The 4112 Computer DlsplayTerminal.
•
ix
4112 SERVICE (VOLUME 2)

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Section 1
INTRODUCTION
USING THIS MANUAL
This is the second volume of a twovolume service
ma nu al fo r the TEKTRONIX 4112 Computer D is play
terminal. This v ol umecontai ns primarily: schematics
and diagrams,and reference information.This volume
is intended
to be used as an on-site service tool and
therefore containsabbreviated forms of :
• Adj
us tment procedures
• Errormessage t
ables
• Strapping information
• Installation information
The i
nsta llation section can be used to verifythat a
411 2 terminal is installed properlyand
is connected to
its host system via the system data path. The strapping
diagrams will
help to verifyth at the terminal is installed
and set up properly for i ts Intended use.Then trouble
shooting can procede whilereferring
to the Self-Test
error message tables, and adjustmentprocedures
(where nece
ss ary). If a fault occurs that requires
examination
of circuit board ~omponents, refer to ttte
schematic diagrams and componenc location photos.
4 112 SERVICE (VOLUME 2)
Volume 1 containsdetailedtheory of operation and
operating information
if an in-depth examination of
terminal operation
is required.
The
Low VoltagePower Supp ly (620-0295-00) in the
4112 terminal is also used in otherTektronix products
and has a separate service manual.
The only options described in this manual are the
memory optionsand thoseotherop
tio ns that are used
only in the 4112 '3rminal. All otheroptions to the 4110
Series terminals (dis:< option,tablet interface, 3PPI,
etc.) have theirown servicemanuals.See Volume 1 of
this manual
for a complete list of options.
1·1

INTRODUCTION
CONTROLS AND CONNECTORS SUMMARY
Figure 1-2 shows the controls andconnectors located
on the front and rear
of the terminal. The indicatorson
this terminal are visual and audible:
• Eight indicator LED lights -where initial error
messages aredisplayed
• Bell -rings during a Power-Up error,
or during Self-
Testerror (see Self-Test, Appendix
B)
Front panel controls for the standard terminal are:
• Power switch
• Intensitycontrol
• Alphanumeric
keyset
• Programmable user-defined Function Keys
• Predefined Function Keys (DIALOG/CLEAR, SETUP,
LOCAL/CANCEL,
and HARD COPY)
• DisplayControl Keys (ZOOM/NORMAL, NEXT
VIEW/BORDER, PAN/OVERVIEW,
and
VIEW/RESTORE)
• Thumbwheels
SCAtEH INTENSITY
•
llEYllOAllD
A
See Section 2 (Volume 1 ), Controls and Functions. k >r a
description
of ea ch of these controls .
Rear panel controls and connectors:
• MASTER RESET switch
• SELFTEST switch
• Powerconnector -accepts
11 OVAC, 60 Hz
• RS-232 connector -
to modem and host data path
• Fuse holder -accepts 6.
25A Slow Bio, size 3AG
FUSI
B
UNIV'31.UQI!
llUCTOll
IWITCl1U CONNICTOll
Fl~ure 1-2. Front and Rear Panel Features.
1-2
4112 SERVICE (VOLUME 2)
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•
•
•
INTRODUCTION
INTERNAL CONFIGURATION
The 411 2 consistsof several physical modules that are
depleted in Figure 1-3:
• Display Mod:.ile
• Keyboard Asseml:'ly
• Di sk Dri ve Unit (optional)
• Low Voltage Power Supply
• Card Cage
The Card Cage and Power Supply are mounted togeth-
er on a hinge,and may be tilted back away from the
Display Module for serviceaccess.The Card Cage
contains a single motherboard that is electrically
divided between the so-called "Processor Bus ·· and the
"Display Bus." Many
of the signalsare common to both
buss a ~ .
NOTE
Th e 4112 Processor Bus is identical to the
4114 's ProcessorB us . The 4112's rasterDis play
Bus 1s somewh'it different than the corresponding
DVSTDi
splay Bus in the 4114 .
Figure 1-4 shows the recommended arrangement of
boards in the Card Cage for a fully configured 41 12. If
the Di sk Controller board is not present.the Processor
occupies slot 7 instead. (All boards are to
ba arranged
toavoid open slots between boards. Emp
ty option slots
at the leftend of the Processor Bus are OK.When the
External Video and Dual Plane Raster Memory boards
are no: present,the adjacent boards are shifted tothe
left, thus leaving no empty slots.
4112 SERVICE {VOLUME 2)
Figure 1-3. 4112 Internal Layout.
1·3

INTRODUCTION
PROCESSOR BUS
SLOT BOARD NAME
1 3pp1•
2 RAM/ROM
3 Tablet•
4 RAM
Controller•
5 RAM
Controller•
8
Proce1aor••
7
Flexlble Diak ••
INDIVIDUAL
JACK NUMBERS
DISPLAY BUS
SLOT
BOARD NAME
8
Video Controller
9 External Video
10 Vector Generator
11 Dual Raster Memo ry
12
Raster Memory
PROCESSOR BUS DISPLAY BUS
44-PIN BUS
(
J341)
80-PIN BUS
(J340)
NOTE: Th ia 11 the factory conf i guration for a fully optioned opt lon al .. t t 2; however. the ar r ange~nt of
board• In 1l ot1 1 through 5 11 not critical .
1-4
•u thl1option 11 not ln1ta ll ed It 11 po11 lble to ln1tall a ny ot her option In th l1 poaltlon .
••
The Proce1aor and Flexi ble Diak board• mu1t be ln1ta ll ed In the order shown ; they may be I nsta lle d
In any pair of 1lot1 on the Proce1aor bu1. If the Flexlble Di ak 11 not Ins ta ll ed, any other option boa rd
may be Installed In lt1 pos iti on .
Figure 1-4. 4112 Motherboard.
3817·71
41 12 SERVICE (VOLUME 2)
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•
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•
INTRODUCTION
ACCESSORIES
The following list of accessori es is taken from the
mechanical parts lists where part numbers are listed
foreach item.This
list is divided in totwo parts: the
standard
4112 accessories,and thoseaccessories
that may
be ordered separately and in addition to the
standard accessories.
STANDARD ACCESSORIES
• 4112 Introduction Brochure
•
4112 Operator's Manu al
• Power Cord Set
• Host Port RS-232 cab le
• Eight re-.legendable
key caps
• Six function-key over
la ys
• 4112 ComputerDisplay Terminal H ost
Programmer's Manual
•
4110 Series Command Reference Manual
4 112 SERVICE (VOLUME 1l
OPTIONAL ACCESSORIES
• Logic Extender Board
• Host Port Loop-back Connector
• Current Loop Interface Loop-back Connector
• Host Path
Ext~nder Cable
• Re-legendable key caps
• Function-key overlays
•
4112 Service Manual, Volume 1
•
4112 Service Manual.Volume 2
•
620 - 0295-00 Low Voltage PowerSupply
Service Manual
•
4110 Series Option 10(Three PortPeripheral
Interface) Service Manual
• 411OSeries F13114 (Graphics Tablet) Service
Manual
•
11 " x 11" Precis io n Polyester Grid,for Option 13
• 30 " x 40 " Precision PolyesterGrid, for Option 14
• 4110 Seri es F42143 (Flexible Disk Drive)
Service Manual
• 119-0977-01103Flexible Disk Drive Unit
Instruction Manual
•
Pa ckage of ten diskettes
• Shugart Drive Unit Alignment Diskette
1-5

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Section 2
INSTALLATION
This section covers unpacking and installing the 4112
terminal. It also provides repackaging instruction for
reshipment of the terminal.
Installation consists
of unpacking the terminal, check-
ing for correctoptions, checking operating voltage and
fuse selection, applying power, connecting the terminal
toa host computer, and testing communication be-
tween tho host computer and theterminal.
The terminal is preassembled and requires no assem-
bly for initial installation. If new options are to be
installed, disassembly
of the terminal may be required.
THIS SHOULD
BE DONE BY QUALIFIED SERVICE
PERSONNEL ONLY. The steps required for installation
are outlined following Unpacking Instructions and Site
Selection.
UNPACKING THE TERMINAL
Remove the 4112 from the shipping carton and inspect
for obvious damage.RETAIN THE PACKING
MATERIALS in caseshipping damage requires repack-
aging for repair:
see Repackaging Instructions at the
end
of this section.See that the enclosed packing list
corresponds with the includedstandard accessories
and ordered optional accessories.
Standard a.ccessories included with the
4112 are:
• 4112 Operator's Manua!
• Power cord set
• Host Port RS-232cable
• Eight relegendable key caps
• Six function key overlays
'4112 SERVICE (VOLUME 2)
Optional accessories available are:
• Logic Extender Board
• Re-legendable key caps
• Function key overlays
•
4112 Computer Display Terminal Host Program-
mer's Manual
•
4110 Series CommandReference Manual
• Firmware Access Manual
• 4112 ServiceManual (Volume 1)
• 4112 Service Manual (Volume 2)
•
4110 Series Option 10 Three Po rt Poripheral Inter-
face (3
PPI) Manual
•
4110 Series Option 13114 Graphic Tablets Manual
• 4110 Series Option 42143 Flexible Disk Drives
Manual
•
119-0977-00 Flexible D isk Drive Instruction Manual
2-1

INSTALLATION
SITE SELECTION
In order to determine t he op timum location for the
:1:m11 inai. you need to understand clearly ho w it fun c-
ti ons and what 1t interfaces to.The 411 2 Computer
D
is play Terminal interfaces between the operatorand a
host computer
by allo wing inputs thr ough a ke yboard
and then providing a
displ ay of computer output data
(alphanumeric and/
or gr aphic ). The 4 112 also con tains
local memory (
up to 512 Kb y te s) .l oca l disk dr ive
capability (with
Opt ion 42 i nst alled) and local graphic
capability. In add
it ion. the terminal can relay bi-
directional
dat a through pe ripheral devices and a
computer.An interface unit must be in
sta ll ed and
co nnected to the comput er - either direc tly (direct
line) or through a modem (modul
ato r-demodulator) -
to perm
it information exchange.The terminal needs to
be located nearthe modem,T
IA (terminal interface
adapter).
or direct line: whi ch everis used.
2·2
If a hard c opy unit is to be connected (TEKTRONIX
4632 or 4643).consult the manuals on the hard copy
unit before connec ting it; also. keep the interfacing
cables as short as possible.
Once the Terminal is unpacked, place it on a stable
desktop
or the place it is to be used.Figure 2-1 shows
thedimensi
ons of the 4112 . This figure can be used as
an aid in determining how much space is needed for
the terminal.
) - --- ~;~;;;; 1
\ ..,..... _,.. ...,......,..._,.._,... ,, ,...~
Adequate clearance should be left on all sides of
the heatsink (adequate clearance is about 4-6
inches) on the rear of the terminal. Air
:emperature measured 1 inch (2. 54 cm) from the
rear
heats111: ~ st1ould not exceed + 40 ° C dur i ng
operation of the terminal.
4112 SERVICE (VOLUME 2)
•
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•

INSTALLATION
•
•
Figure 2- 1. 411 2 Dimensions.
•4112 SERVICE (VOLUME
2)
2-3

INSTALLATION
INSTALLATION PROCEDURES
Installation of the terminal does not requ ir e accessing
any int ernal parts . On ly qualif i ed service technicians
sho ul d open the termlnars cover; in such cases all
cautions andwarnings must
be observed.
I WARHlfllG I
Dangerous v olt ages ex is t w it hin the terminal.
Normal e lectrical precautions should be observed
whenever w
orking Inside the ·terminal.
CHECKING FOR CORRECTLy INSTALL: eo
OPTIONS AND PRO'PER OPERATING
VOLTAGE
Oncethe terminal is on a stablework area,veri fy that
theoptions installed are the options ordered.A simple
verification can
be made by looking at the rear panel of
the instrum
ent On therear panel.there is a sticker
containing a hst of the options installed in the terminal.
Al the same lime the options are checked ,theoperat-
in g voltage should also be checked .This can b ~ simply
done
by checking the yellow tab at the rear of the
terminal.Figure 2-2
sho ws both the yellow tab and the
option sti
cke r.
'.J' ,, ..I .J' "" ...,, .., _,r,,.
) CAUTION ~
' ,,...,, J""__,...__,.,,,,..._, ~ ..,.. ~
If the terminal is not set for the proper operating
voltage , and the term i nal is connecte d to a
voltage different than what it is set for, ser ious
damage to the termi
nal could result.
,.., _,..,,,..., ., ...,..v .,,.,
~ CAUTIO N ~
~""""'~~
Installati on of new options and changing the
operating voltages for
the 4112 should be done
by qualif ied service personnel only . Procedur:es
forchanging the operating voltage are located in
Volume 1,
App end ix D ( Option Installation Pro-
ce dures.) The procedures for installing othe r
optio ns are locate d in the manuals for those
opt ions.
2-4
APPLYING POWER
Power is applied to the 41 12 by plugging the female
end
of the power cord into the AC power socket. The
corresponding male end
of the same cord can then be
plugged into the AC poweroutlet. The
41 12 can then
be turned on by pressin!:f the power switch located
near the lower lefthand
corner of the terminal'sdisplay
screen. After the power
sw i tch is turned on, a cursor
should appear
in the upper left corner of the screen.
TESTING THE TERMINAL (SELF-TEST)
NOTE
More
about Se ll- Test can be found in Section 10
(Vol. 1)
or Sect ion 5 (Vol. 2) of this service
manual . If the ter minal fa ils to pass one of the
parts of Self-Test. a failure co de w ill stay ' it on the
keyboard lights. To decode the failure. consult
Sect ion 5. The f ollo wing procedures are only for
ver ific ation of crwect operation of the terminal. A
more complete performance verification proce-
dure is in Se ction 8 of Vo lu me 1.
When turning on the terminal in the mann er above, the
terminal goes through a Power-Up (Se
lf -Test)
sequence.T
his routine tests about 30 %of the terminal
circuitry. If an error is found during th
is power up
sequence, an er ror message will be sent in the form of
a Hexadecimal code displayed on the LED's on the
keyboard.
F
or first time operatlGn, a more detailed version of Self-
Test should be run.A briefoutline of how
to perform
this t
est follows. Again,there is adetailed section on
Self-Te$! and Self-Test failure codes in Section 5
(Error Codes) of this manual (Vol. 2):
1. Apply power
to the terminal.
2. Press the SELF TEST button (located on the rear of
the terminal) and hold it down.
3. Press the MASTER
RE SET button (located next to
the SELF TEST button) and release it.
411 2 SERVICE (VOLUME 2)
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