IBM PS/2 95 XP 486 Owner's manual

FRONT
PICTURE 1
Part Number 04G3394
Form Number S85F-1676-02
IBM PS/2 Model 95 XP 486 HMS
¦ Copyright IBM Corp. 1990, 1991
FRONT - 1

FRONT_1 Safety Information
Refer to the Hardware Maintenance Service General Information pamphlet for
the following information:
General Safety
Electrical Safety
Safety Inspection Guide.
Third Edition (October 1991)
The following paragraph does not apply to the United Kingdom or any
country where such provisions are inconsistent with local law:
INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS
IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express
or implied warranties in certain transactions, therefore, this statement
may not apply to you.
This publication could include technical inaccuracies or typographical
errors. Changes are periodically made to the information herein; these
changes will be incorporated in new editions of the publication. IBM may
make improvements and/or changes in the product(s) and/or the program(s)
described in this publication at any time.
It is possible that this publication may contain reference to, or
information about, IBM products (machines and programs), programming, or
services that are not announced in your country. Such references or
information must not be construed to mean that IBM intends to announce
such IBM products, programming, or services in your country.
Requests for technical information about IBM products should be made to
your IBM Authorized Dealer or your IBM Marketing Representative.
IBM may have patents or pending patent applications covering subject
matter in this document. The furnishing of this document does not give
you any license to these patents. You can send license inquiries, in
writing, to the IBM Director of Commercial Relations, IBM Corporation,
Purchase, NY 10577.
¦ Copyright International Business Machines Corporation 1990, 1991. All
rights reserved.
Note to US Government users-Documentation related to Restricted
rights-Use, duplication, or disclosure is subject to restrictions set
forth in GSA ADP Schedule Contract with IBM Corp.
IBM PS/2 Model 95 XP 486 HMS
Safety Information
¦ Copyright IBM Corp. 1990, 1991
FRONT_1 - 1

FRONT_2 Special Notices
References in this publication to IBM products, programs, or services do
not imply that IBM intends to make these available in all countries in
which IBM operates. Any reference to an IBM product, program or service
is not intended to state or imply that only IBM's product, program, or
service may be used. Any functionally equivalent product, program, or
service that does not infringe any of IBM's intellectual property rights
or other legally protectible rights may be used instead of the IBM
product, program, or service. Evaluation and verification of operation in
conjunction with other products, programs, or services, except those
expressly designated by IBM, are the user's responsibility.
IBM may have patents or pending patent applications covering subject
matter in this document. The furnishing of this document does not give
you any license to these patents. You can send license inquiries, in
writing, to the IBM Director of Commercial Relations, IBM Corporation,
Purchase, NY 10577.
The following terms, denoted by an asterisk (*) in this publication, are
trademarks of the IBM Corporation in the United States and/or other
countries:
IBM
Personal System/2
XGA
XP.
The following terms, denoted by a double asterisk (**) in this
publication, are trademarks of the Intel corporation in the United States
and/or other countries:
486
487
SX.
IBM PS/2 Model 95 XP 486 HMS
Special Notices
¦ Copyright IBM Corp. 1990, 1991
FRONT_2 - 1

CONTENTS Table of Contents
FRONT_1 Safety Information
FRONT_2 Special Notices
CONTENTS Table of Contents
1.0 General Checkout
2.0 Installed Devices List
2.1 Device Type
2.2 SCSI Devices
2.3 Non-SCSI Devices
3.0 Power-On Password
4.0 Undetermined Problem
5.0 Enable and Disable Settings
6.0 Power Supply Voltages / Fans
7.0 Display Self-Test
8.0 Printer
9.0 IML / IPL
10.0 Processor Board
11.0 Keyboard
12.0 Memory
12.1 Memory (Type 1 Systems)
12.1.1 Finding the Failing Memory
12.2 Memory (Type 2 Systems)
12.2.1 Finding the Failing Memory
13.0 Processor Board and Reference Diskette Matrix
14.0 Symptom-to-FRU Index
14.1 No-Beep Symptoms
14.2 Beep Symptoms
14.3 SCSI Tape Drive Symptoms
14.4 Miscellaneous Symptoms
14.5 Numeric Error Codes
15.0 How To Use This Parts Catalog
15.1 Example of a Parts List
16.0 System Overview
17.0 System Overview (continued)
18.0 Parts
IBM PS/2 Model 95 XP 486 HMS
Table of Contents
¦ Copyright IBM Corp. 1990, 1991
CONTENTS - 1

1.0 General Checkout
Familiarize yourself with the model-specific Hardware Maintenance
Reference pamphlet and the following information before starting with step
1.
The diagnostic tests are intended to test only IBM (*) marketed products.
Non-IBM marketed products, prototype cards, or modified options can give
false errors and invalid system responses.
Running Automatic Configuration
Warning: Running Automatic Configuration may alter customized
configuration settings. Note the current settings using View
configuration. If the configuration was customized, restore it to the
customized settings after service is complete.
Diagnosing Combined FRUs: If an adapter or device consists of more than
one FRU, an error code may be caused by any of the FRUs. Before replacing
the adapter or device, remove the FRUs, one by one, to see if the symptoms
change.
If you are instructed to replace either the processor board or the system
board, and the first board that you replaced does not correct the problem,
then replace the other board (processor or system) and reinstall the
original board.
Using Error Messages: Use the error codes displayed on the screen to
diagnose failures. If more than one error code is displayed, diagnose the
first error code first. The cause of the first error code can cause false
error codes to be displayed.
If there is not an error code on the screen, see if the error symptom is
listed in the Symptom-To-FRU Index. If the symptom is not listed,
diagnose the POST error code displayed on the information panel.
+---+
¦001¦
+---+
- Power-off the system and all external devices.
- Verify the power-on password is inactive.
- Check all cables and power cords.
- Make sure there are no diskettes in the drives.
- Power-on all external devices.
- Power-on the system.
Note: If you get a POST error code, press the pause key (while the
error code is on the screen). Write down any error codes that
are displayed, then press F1 to continue. If the test stops and
you cannot continue, go to "Symptom-to-FRU Index" in topic 14.0.
ARE ANY EXTERNAL SCSI DEVICES ATTACHED TO THE SYSTEM?
Yes No
¦ ¦
¦ +---+
¦ ¦002¦
¦ +---+
¦ Go to Step 005.
¦
+---+
¦003¦
+---+
DID THE POWER-GOOD LIGHT ON ALL OF THE EXTERNAL DEVICES COME ON?
Yes No
¦ ¦
¦ +---+
¦ ¦004¦
¦ +---+
¦ Go to the external devices service pamphlet.
¦
¦
+---+
¦005¦
+---+
DID YOU RECEIVE A POST ERROR CODE?
Yes No
¦ ¦
¦ +---+
¦ ¦006¦
¦ +---+
¦ Go to Step 014.
¦
+---+
¦007¦
IBM PS/2 Model 95 XP 486 HMS
General Checkout
¦ Copyright IBM Corp. 1990, 1991
1.0 - 1

+---+
IS THE FIRST POST ERROR CODE WITHIN THE RANGE OF 02080000 190I TO 02410000
190I?
Yes No
¦ ¦
¦ +---+
¦ ¦008¦
¦ +---+
¦ Go to Step 014.
¦
+---+
¦009¦
+---+
- Restart the system and verify that the "Enable" and "Disable" settings
are correct. (For more information, go to "Enable and Disable Settings"
in topic 5.0.) If you receive a warning on the screen regarding the
"Keep" and "Remove" settings, follow the instructions on the screen
before continuing.
DID YOU HAVE TO CORRECT ANY OF THE ENABLE AND DISABLE SETTINGS?
Yes No
¦ ¦
¦ +---+
¦ ¦010¦
¦ +---+
¦ Go to "Symptom-to-FRU Index" in topic 14.0. Before replacing any
¦ SCSI devices, verify there are no duplicate SCSI ID settings.
¦
+---+
¦011¦
+---+
- Restart the system.
DID THE POST ERROR REMAIN?
Yes No
¦ ¦
¦ +---+
¦ ¦012¦
¦ +---+
¦ Continue with Step 014.
¦
+---+
¦013¦
+---+
Go to "Symptom-to-FRU Index" in topic 14.0.
--------------------------------------------------------------------------
+---+
¦014¦
+---+
- Press Ctrl+Alt+Del. When the curser moves to the upper right, press
Ctrl+Alt+Ins and check for the following responses:
1. One or two short beeps.
2. Readable instructions or the Main Menu.
DID YOU RECEIVE THE RESPONSES LISTED PREVIOUSLY?
Yes No
¦ ¦
¦ +---+
¦ ¦015¦
¦ +---+
¦ Go to "Symptom-to-FRU Index" in topic 14.0.
¦ - or -
¦ If that does not correct the problem, go to "Undetermined Problem" in
¦ topic 4.0.
¦
+---+
¦016¦
+---+
- If you are not at the Main Menu, follow the instructions on the screen
to advance to the Main Menu, then press Ctrl+A and run system checkout.
- If the test stops and you cannot continue, go to "Undetermined Problem"
in topic 4.0.
Notes:
1. If the system has incorrect keyboard responses, go to "Keyboard" in
topic 11.0.
2. If the printer has incorrect responses, go to "Printer" in
topic 8.0.
3. If the information panel has missing or distorted digits, go to
"Symptom-to-FRU Index" in topic 14.0.
4. If the display has problems such as jittering, rolling, shifting, or
being out-of-focus, go to "Display Self-Test" in topic 7.0.
5. If a minimum of 896KB of memory is not active, the diagnostic tests
cannot be loaded.
IBM PS/2 Model 95 XP 486 HMS
General Checkout
¦ Copyright IBM Corp. 1990, 1991
1.0 - 2

IS THE LIST OF INSTALLED DEVICES CORRECT?
Note: Memory, 487SX (option), and processor board cache (256KB) will not
be listed.
Yes No
¦ ¦
¦ +---+
¦ ¦017¦
¦ +---+
¦ Go to "Installed Devices List" in topic 2.0.
¦
+---+
¦018¦
+---+
- Run the advanced diagnostic tests.
DID THE TESTS IDENTIFY A FAILURE?
Note: If the test stops and you cannot continue, replace the last device
being tested.
Yes No
¦ ¦
¦ +---+
¦ ¦019¦
¦ +---+
¦
¦ Note: If you noticed an error symptom or if you received any POST
¦ error codes when the system was powered-on, go to
¦ "Symptom-to-FRU Index" in topic 14.0.
¦
¦ You may have an intermittent problem:
¦ Check for damaged cables or connectors.
¦ Reseat all adapters, drives, and modules.
¦ Check the system fans.
¦ Start an error log and run the tests multiple times.
¦
+---+
¦020¦
+---+
Follow the action described on the screen. If that does not correct the
problem go to "Symptom-to-FRU Index" in topic 14.0.
--------------------------------------------------------------------------
(*) IBM is a trademark of the International Business Machines
Corporation.
IBM PS/2 Model 95 XP 486 HMS
General Checkout
¦ Copyright IBM Corp. 1990, 1991
1.0 - 3

2.0 Installed Devices List
If an adapter or device is missing from the list, you might have one of
the following conditions:
The fixed disk drive (hard disk drive) (or Reference Diskette) does
not contain the module of code required to support that device.
The missing device is an unrecognizable adapter.
The missing device requires an additional diskette or service manual.
The missing device is defective.
An adapter is defective.
Subtopics
2.1 Device Type
2.2 SCSI Devices
2.3 Non-SCSI Devices
IBM PS/2 Model 95 XP 486 HMS
Installed Devices List
¦ Copyright IBM Corp. 1990, 1991
2.0 - 1

2.1 Device Type
Run Automatic Configuration (see "Running Automatic Configuration" in
topic 1.0 before continuing) and determine which type of device, SCSI or
non-SCSI, is missing from the Installed Devices List (in Advanced
Diagnostics), then continue with the following steps. (If SCSI and
non-SCSI devices both are missing, go to "Undetermined Problem" in
topic 4.0.)
IBM PS/2 Model 95 XP 486 HMS
Device Type
¦ Copyright IBM Corp. 1990, 1991
2.1 - 1

2.2 SCSI Devices
The adapter supporting the missing device may be defective. If more than
one SCSI adapter is installed, isolate them one at a time.
1. Power-off the system and disconnect any internal and external SCSI
devices from the SCSI adapter (except the default hard disk drive).
2. Terminate the adapter, as required.
3. Power-on the system and run Automatic Configuration (see "Running
Automatic Configuration" in topic 1.0 before continuing). If the
adapter is not on the Installed Devices List (in Advanced
Diagnostics), the adapter is defective. If the adapter is on the
list, run the adapter diagnostic tests.
4. If the adapter fails the tests, replace the cable. If the adapter
passes the tests, a different adapter may be defective.
5. Reconnect the devices to the adapter, then terminate the adapter, as
required.
6. Go to "Undetermined Problem" in topic 4.0 to find the problem.
IBM PS/2 Model 95 XP 486 HMS
SCSI Devices
¦ Copyright IBM Corp. 1990, 1991
2.2 - 1

2.3 Non-SCSI Devices
Replace the missing device.
Note: If the number of diskette drives shown on the list is incorrect, an
error can occur during the tests. Restart the system, select View
Configuration from the Set Configuration menu and verify that the
drive information is correct, then continue testing.
IBM PS/2 Model 95 XP 486 HMS
Non-SCSI Devices
¦ Copyright IBM Corp. 1990, 1991
2.3 - 1

3.0 Power-On Password
To service a system with a power-on password:
1. Move the system board jumper J16, to connect the center pin and the
pin on the opposite end of the connector (see the figure on page
12.0).
2. Power-on the system.
The system detects the change and removes the password. Do not move the
jumper back to its original position.
IBM PS/2 Model 95 XP 486 HMS
Power-On Password
¦ Copyright IBM Corp. 1990, 1991
3.0 - 1

4.0 Undetermined Problem
You are here because the diagnostic tests did not identify which adapter
or device failed. Do not isolate FRUs that are known to be good.
If the power-on light is not on, verify (with power off) that the
voltage-select switch is in the correct position. Then check the power
supply voltages. If the voltages are not correct, replace the power
supply. If the voltages and switch setting are correct, do the following:
1. Power-off the system.
2. Remove or disconnect one of the following:
Note: Minimum operating requirements are one pair of 1MB kits (type 1
systems) or one 2MB kit (type 2 systems), the processor board,
and the default drive 6.
Non-IBM devices
Modem, printer, mouse, or other device
Any adapter (except the Processor Board)
Processor board cache option (256KB)
487SX math coprocessor option
Hard-disk or diskette drive
Memory-module kits.
3. Power-on the system.
4. If the problem remains, repeat steps 1 through 3 until you find the
failing adapter or device.
5. If all adapters and devices have been removed and the problem remains,
suspect the system board, processor board, then the power supply.
IBM PS/2 Model 95 XP 486 HMS
Undetermined Problem
¦ Copyright IBM Corp. 1990, 1991
4.0 - 1

5.0 Enable and Disable Settings
To check the settings, select Set and View SCSI Device Configuration from
the Set Configuration menu and see if any Presence Error Reporting devices
are listed (not all devices report). Set devices connected to the system
to "Enabled." Set devices listed but not connected to "Disabled." Press
F5 to make changes then press F10 to save the changes.
For more information, see "Presence Test" in the Diagnostic Information
for Micro Channel Computers pamphlet.
IBM PS/2 Model 95 XP 486 HMS
Enable and Disable Settings
¦ Copyright IBM Corp. 1990, 1991
5.0 - 1

6.0 Power Supply Voltages / Fans
While shorting pins 1 and 2 together, read the voltages on the other pins.
If the voltages are incorrect, replace the power supply.
+------------------------------------------------------------------------+
¦ V dc ¦ V dc ¦ -Lead ¦ +Lead ¦
¦ Minimum ¦ Maximum ¦ Pin ¦ Pin ¦
+-----------------+------------------+-----------------+-----------------¦
¦ ¦ ¦ ¦ ¦
¦ +3.7 ¦ + 6.2 ¦ 5 ¦ 3 ¦
¦ +9.0 ¦ +15.0 ¦ 5 ¦ 4 ¦
¦ - 9.0 ¦ - 15.0 ¦ 5 ¦ 7 ¦
¦ +3.7 ¦ + 6.2 ¦ B ¦ D ¦
¦ +9.0 ¦ +15.0 ¦ B ¦ A ¦
¦ ¦ ¦ ¦ ¦
+------------------------------------------------------------------------+
PICTURE 2
In addition to the power supply fan, some systems require a fan on the
system access cover. Excess heat will cause intermittent failures. If
the power supply fan failed, replace the power supply. To determine if
the system access cover fan failed, do the following:
1. Check for 12 V dc (±1.4 V dc) at the two fan cable assembly pins on
the system base.
If the voltage is correct, check for 1300 ohms (±10%) resistance
between the fan terminals.
If the resistance is incorrect, replace the fan.
If the resistance is correct, check the spring clip connections.
If the connections are good, there is not a fan problem.
2. If the voltage is incorrect, unplug the fan cable assembly from
connector J28 on the system board and check the cable assembly for
continuity (see the figure on page 12.0).
If the cable has continuity, replace the system board.
If the cable does not have continuity, replace it.
IBM PS/2 Model 95 XP 486 HMS
Power Supply Voltages / Fans
¦ Copyright IBM Corp. 1990, 1991
6.0 - 1

7.0 Display Self-Test
1. Power-off the system unit and display.
2. Disconnect the display signal cable.
3. Power-on the display.
4. Turn the contrast to its maximum position.
5. Turn the brightness control to the center detent position.
The screen should be white with a black margin, as described below
(shading may occur near the edges).
8503, 8512, 8513, 8514, 8515: 2--20 mm (0.08--0.79 in.) wide on one
or both sides.
8506: 2-50 mm (0.08-1.97 in.) wide on the top, or bottom, or both.
8507, 8508: 2-20 mm (0.08-0.79 in.) wide on the top, or bottom, or
both.
If the screen does not meet the test specifications, replace the display.
If it meets the test specifications, replace the display adapter.
Note: Certain adapter failures can cause video problems. Before
replacing FRUs, remove any option adapters to see if the problem
disappears.
IBM PS/2 Model 95 XP 486 HMS
Display Self-Test
¦ Copyright IBM Corp. 1990, 1991
7.0 - 1

8.0 Printer
1. Make sure the printer is properly connected and powered-on.
2. Run the printer self-test.
If the printer self-test does not run correctly, the problem is in the
printer. Refer to the printer service manual.
If the printer self-test runs correctly, install a wrap plug on the
parallel port and run the advanced diagnostic tests to determine which FRU
failed.
If the advanced diagnostic tests do not detect a failure, replace the
printer cable. If the problem remains, replace the system board.
IBM PS/2 Model 95 XP 486 HMS
Printer
¦ Copyright IBM Corp. 1990, 1991
8.0 - 1

9.0 IML / IPL
You are here because you have an Initial Machine Loading (IML) or an
Initial Program Loading (IPL) problem resulting in one of the following
symptoms:
You have an I999XXXX error
The system was powered-on without a POST error, but the operating
system does not work or the system starts up in BASIC.
Verify that the system has a valid Selectable Startup Sequence. To do
this:
1. Start the system from the Reference Diskette and select Set Features
from the Main Menu.
2. Select Set Startup Sequence and see if the default hard disk drive
(drive 6) is in the startup sequence. If you receive an error
message, follow the instructions on the screen, then return here.
3. If the default drive is in the startup sequence, exit from the screen
and the Main Menu, then go to the next step. If the default drive is
not in the startup sequence, follow the instructions on the screen,
then continue with the next step.
4. Power-off the system, remove the Reference Diskette, then power-on the
system. If the "F1" (Insert Diskette) icon appears on the screen,
continue with the next step. If the "Not OK" icon appears on the
screen, go to step 6.
5. Change the startup sequence to include a device that has an operating
system, then go to step 8. The system didn't detect an operating
system on any of the devices in the startup sequence.
6. Restart the system from the Reference Diskette. Select Update System
Programs from the Main Menu and wait for the program to complete
running.
7. Power-off the system, remove the Reference Diskette and continue with
the next step.
8. Power-on the system, check for the normal power-up sequence and then
Run the Advanced Diagnostic tests. If the problem still exists, go
back to the "Symptom-to-FRU Index" in topic 14.0.
Note: If the startup sequence was customized, restore it to the
customized settings after service is complete.
IBM PS/2 Model 95 XP 486 HMS
IML / IPL
¦ Copyright IBM Corp. 1990, 1991
9.0 - 1

10.0 Processor Board
You are here because the system has the following symptoms:
No beep
No message on the display
Fan runs
Power-on light is on.
Remove the adapters (except the processor board), the memory-module kits,
and the processor-board cache option (256KB) one at a time, until you find
the failing adapter. If all adapters have been removed and the problem
remains, replace the processor board. If the problem still remains,
replace the system board.
IBM PS/2 Model 95 XP 486 HMS
Processor Board
¦ Copyright IBM Corp. 1990, 1991
10.0 - 1

11.0 Keyboard
1. Power-off the system.
2. Disconnect the cable from the keyboard.
3. Power-on the system and check the connector for the voltages shown.
All voltages are ± 5%.
PICTURE 3
If the voltages are correct, replace the keyboard.
If the voltages are not correct, suspect the keyboard cable, then the
system board.
IBM PS/2 Model 95 XP 486 HMS
Keyboard
¦ Copyright IBM Corp. 1990, 1991
11.0 - 1