NCR PC4I User manual

( Personal
Computer
PC4i
Service Manual

March 1986
Copyright c 1986 by NCR Corporat i on
Dayton . Ohio
All Rights Reserved
Pr inted in the Federal Republic of Germa ny
It is the policy of NCR Corporation to improve products as new
technology, components, software,
and firmware become available.
NCR Corporation, therefore, reserves
the right to change specifica-
tions
without prior notice.
All features, functions,
and operations described herein may not be
marketed by NCR in all parts of the world. In some instances, photo-
graphs are of equipment prototypes.Therefore,before using this docu-
ment, consult
your NCR representative or NCRoffice for information
that is applicable and current.
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NCR PERSONAL COMPUTER PC 4i
SERVICE MANUAL
CONTENTS
Chapter 1 System Overview
NCR Personal Computer Hardware
Display Unit .................................. .
t-!odels ................................ · · .. · · · · ·
lliodel r,Jumbers •..•...•.•..•.•...•••••..•..••.•.•
Tools ............................ , ........ · · · ·
Alternate Main Processor Board .......•....••..•
Chapter 2 Basic Troubleshooting
Level O (Power-On) Diagnostics
Power On •...•..•...••.•••....•.•..•.........•.
Power Cords and Switches ...•...•..•...•.••••.••
Memory Test Messages •.••..••••.••...•..••.•••.
After First Attempt .•........•.......•.••....•
After Second Attempt ..•.........•.....••••.•••
Power Supply ...............•.................••
l)eripherals ................................... .
Check Keyboard ......•.........•...••.•.•••.....
Check for Diagnostic Errors •.•..•...••••....•..
Restore Full Configur·ation ••••.••...•....•••.•.
Test Total Memor·y ..•..••..•..•....•••...••.•..
Test CRT and Disk Drives •...•..•....••••......
Re-Installation ...••.•.•...............•..•.••.
Chapter 3 Level O Diagnostics
Memory Test ...•..•...•••.•.••......•••..•.•...•.
Other• MPB Tests •...•.•.••...•..••....••.••••••..
r:eyboar·d Test .................................. .
Initialization and Loading •••.••..••.•.•..•.•...
Er. ror Returns .................................. .
Parallel Port Error Codes ..•.............••.•..•
Level O Loop Tests on Generic Processor Board ••
Error Messages of the Early-Type MPB ••••..•.••.
Suggested Action .......•..•.....•....•......••.
1-1
1-1
1-3
1-5
1-6
1-8
2-1
2-2
2-2
2-3
2-6
2-7
2-9
2-17
2-17
2-17
2-19
2-19
2-20
2-22
3-1
3-5
3-5
3-5
3-6
3-7
3-7
3-14
3-15
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Chapter 4 Level 1 Diagnostics
How to Begin Testing .......................... .
Load the Diskette
Main Menu
Main Menu Help Screens ••••••.•..••••.••.•....••
Test Completion Displays •.••.•••••.••.••...••..
Diagnostic Selections ••••.••.••.•.•.••••••.•...
Run all Tests Once ........................... .
Automatic Completion ••••••.•.•.••••.•••.......
Memory (Main Menu Selection 1) •••.•..•••••••••
Memory Test Help Screens ••.•..•.....•.••.•••..
RAM Pat tern Test ..•••........•................
RAM Address Test ••••••••.••.••••..••••.•.•••.•
RAM Parity Test ••....•.....•..............•..
RAM Walking Ones Test •••....••.•....••...•••.•
Firmware Checksum Test ••••..•••...••.•...•....
Controllers (Main Menu Selection 2) •••.....•.••
Controllers Test Help Screens ••.....•.•••.••••
CPU Test ••••••.•..••••••••....•.•••••••......•
DMA Test ..•••••••••.••.••••••.•...•••..•...•••
Flexible Disk Controller Test •.....••••.•.••••
Interval Timer Test •.•.•.......••.•....•••..•.
Interrupt Controller Test ....•............•...
CPU Controller Test ••••.•.•.••.•••.••...•.....
Monochrome Display Controller Test •...•.•.••..
Color Graphics Display Controller Test .••.•.•.
Serial Synchronous Controller Test •.•.•.•.•••.
Keyboard (Main Menu Selection 3) .............. .
Flexible Disk Drive (Main Menu Selection 4) .•.•
Flexible Disk Drives HELP Screens •.••.........
Read Only Drive A Test •••••.••.•...•..••.••.••
Read/Write Drive A Test •.•.•••••••••••........
4-1
4-1
4-2
4-5(
4-6
4-8
4-9
4-9
4-11
4-12
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-18
4-19
4-20
4-21 (
4-22
4-23
4-24
4-23
4-26
4-26
4-28
4-28
4-29
4-30
4-31
Fixed Disk Drive (Main Menu Selection 5) •..•••
Fixed Disk Drive Test HELP Screen .•••••.•.•..•
4-32
Read/Write Maintenance Track •••••••.••••...••. 4-32
Read Only Sector O .••.••.•..•..•..•••••••..•.• 4-33
Read Only Entire Disk •••••.••••••••••••••.•.•• 4-34
Read/Write Entire Disk ••••.••••••••••••••.••.. 4-35 l'
Fixed Disk Controller ••••••.••••••••••••••••.• 4-38
Monochrome Display (Main Menu Selection 6) ..... 4-39
Color/Graphics Display (Main Menu Selection 7) •• 4-41
Peripherals (Main Menu Selection 8) ••••.••••.• 4-47
Serial Port Loopback Test •••••••••••.•••••..•• 4-48
Parallel Port Loopback Test •••..••••••••••••.. 4-49
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Printer Tests .........................•.......
Generic Printer Test . ........................ .
PC Compatible Printer Test ••••.•.•••••••.••••.
Utilities ..................................... .
Videotex Adapter Tests (Main Menu Selection) •...
Local Test ................................... .
Remote Test
Picture Test ................................. .
Chapter 5
Level 1 Diagnostic Error Returns
4-50
4-51
4-52
4-53
4-54
4-55
4-55
4-57
Repair Guidelines ..••.•.••....•...•....••.....• 5-1
Basic System Configuration •.••......•..•....•... 5-1
Preliminary Checks ..••..•....•.•...•.•.••..•..•. 5-2
Main Processor Board Components ....••••••••.•... 5-3
Memory Addressing •.•••.••.....•...••.......•..•• 5-5
Error Codes • • • • • . • • . • • . . . • . . • • . • . . . • • . . • . . . • . . . • 5-8
Relationship between Detail CodeG and
Repair Procedures ••..•••.••...•.•••.•••••.•..••
Format of Displayed Error Codes ..•.••.•••••••.
List of Major Error Codes •••••••••••.••....•..
Memory Error Codes •..•..•••••••..••..•••......
Repair Procedure 01 ...•••..•....•.••••.•..•..
Repair Procedure 02 •.••.••......•..•..•..••..
Repair Procedure 03 .••••••.•••..•••.••••.••.
Repair Procedure 04 ••••.••••••.•.•.••••.••.•
Repair Procedure 05 •••••.••••..•.••..••••••.
Flexible Disk Drive Error Codes •.••.••••••••••
Repair Procedure 06 .•.••.••.•.•.•.••.•••..•••
Keyboard Errol' Codes ..••...••.••...••..••••••.
Repair Procedure 07 ......................... .
Video Display Error Codes .•......•.••••.••..••
Repair Proceduce 08 ••••.•••••.•••.•.•••••••..
Repair Procedure 09 ..••...••.••..•••••••.••..
Peripheral Error Codes •..••••••..••..••••... ,.
Repair Procedure 10 ••..•..••...••...••••••••
Repair Procedure 11 .••.•••..••••••••.••••••.
Repair Procedure 12 .••.••••.•...••••.••..•••
Major System Controller Error Codes •••.•...•••
Repair Procedure 13 ...•..•••.•....•..••...•..
Repair Procedure 14 •...•...•••..•...••••••••.
Repair Procedure 15 •.••...••.........•••.••..
Repair Procedure 16 •.••..•.•••..•••.••••...•.
Repair Procedure 17 ........................ .
5-8
5-10
5-10
5-12
5-13
5-18
5-20
5-21
5-21
5-23
5-25
5-32
5-32
5-34
5-35
5-37
5-38
5-40
5-43
5-46
5-39
5-47
5-48
5-48
5-49
5-50
iii

Repair 18
Repair 19
dure
dure
Repair Procedure 20
..........................
Fixed Disk Controller Error Codes ••••••••••••••
Repair Procedure 21
Repair Procedure 22 ..........................
Videotex Error Codes
Repair Procedure 23
Repair Procedure 25
Repair Procedure 26
and 24
Removal/Replacement
Chapter 6
Cabinet •.••••••
Card Rack Assy
Printed Circuit Boards
Options PCBs
Main Processor Board
Disk Drives
ON/OFF Switch
Brightness and Volume Controls ••••••••.••••••
Monochrome CRT/Power Supply Assy •••••••••••.••
Complete Assembly ..•..........•..............
Power Supply
Monochrome Deflection Board ••••••••••••••••..
Monochrome CRT
Color CRT/Power Supply Assy •••••••
Power
Color
Supply
Deflection Board •••••••••••
Color CRT
Chapter 7
Monochrome
Adjustments
CRT
Display out of Focus
Display too Dim
Display Rolls
Display too Short/Long
Display Not Linear
Display too Wide/Narrow
Display Tilted
Character Field Size
Color CRT
Horizontal Deflection
iv
5-51
5-52
5-52
5-53
5-53
5-54
5-56
5-57
5-57
5-57
6-1
6-2
6-4
6-4
6-5
6-7
6-9
6-10
6-11
6-11
6-12
6-14
6-15
6-17
6-18
6-19
6-21
7-1
7-3
7-3
7-4
7-4
7-5
7-5
7-5
7-6
7-6
7-8

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Dseillator Alignment .........••••....•..••.... 7-8
Picture Width • . . . . . • . . . • •• . . • • • •. • . . . . . • • . . . • 7-9
Vertical Deflection ....•••.••••••..••••••••••. 7-10
Video .......................................... 7-11
Cutoff Adjustment •••••••••.••.•••..••••••..•.. 7-11
~lhiteness ..................................... 7-12
Sub-Brightness .••..•••..••.. , . . . • • . • . • . . . . •. • . 7-12
FOCU!::> .......................................... 7-13
Convergence ................................... 7-13
Convergence Adjustments ....................... 7-13
Adjustnents for Videotex Monitor 008-0072370 7-15
Adjustments for Videotex Monitor 008-0072196 .• 7-18
Chapter 8 Strapping Inf'ormation
Main Processor Board .......................... .
Configuration Switches ••••..••.•••.••.••..•••••
Jumper Settings ............................... .
Alternate Main Processor Board .•...••..•••.••.
Switch Set tings ............................... .
Jumper Settings ............................... .
Early-type Main Processor Board ••••••••••••••••
Switch Configurations of Early-type MPB •...•.••
Switch Configurations of PCBs ••••••••••••••.•••
Memory Expansion Board ••••.•••••••••••••••••••
Alpha Display Adapter •••••.•••••••••••••••••••
Graphic Controller Boards •••..•.••••••••••••.•
In-House DLC Adapter .••••••••.••.•.•••••••••..
Videotex Adapter Board •••••••••••.•••.••••.••
Flexible Disk Controller Board 1.2 MB •.••.•••••
Hard Disk Controller Boards
Flexible Disk Drive Jumpers •.•••••••••.•••.••••
Appendix A Layouts and Schematics
8-1
8-1
8-5
8-1
8-2
8-6
8-7
8-8
8-10
8-10
8-11
8-12
8-13
8-14
8-16
8-17
8-20
V

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(_
Chapter 1
System Overview
RCR PERSORAL COMPUTER HARDWARE
The NCR Personal Computer consists of a main Display
Unit and a Keyboard. The computer is available in
different models, and has a variety of options that
can be added to each model. Expansion boards from
non-NCR (nthird partyn) manufacturers can be used
with the NCR Personal Compter, .as well as expansion
boards offered by NCR.
DISPLAY URIT
The standard Display Unit consists of the following
parts:
o Cabinet
o Power Supply
o 1 or 2 flexible disk drive(s) or one flexible disk
drive and one hard disk drive
o 12-inch monochrome CRT display or 12-inch color
CRT display
o Processor Board with:
o 8088 Microprocessor
o 256 KB Random Access Memory (RAM)
o 16K Read Only Memory (ROM)
o RS-232-C Serial Interface
o Centronics Parallel Interface (for printer)
1-1

SY STEM OVERVIEW
o Plug-in board option expansion slots
0 Fixed disk drive controller plug.in board if
the unit includes a fixed disk.
0 Video controller plug-in board. (
A block diagram of the NCR Personal Computer Hardware
is shown in Figure 1-1.
MAIN
MEMOAY
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FIJCED DISK
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I MONOCHROME I
I ADAPTER I
I ll294-Kl411 I
:_ _________ J
1-1 Hardware Block Diagram
The
Main Processor Board and any option boards are
1-2