IBM PS/2 25 SX Owner's manual

FRONT
PICTURE 1
March 10, 1992
This pamphlet contains a Symptom-to-FRU Index, a parts listing, and
procedures for isolating problems to a FRU for the IBM Personal System/2
Model 25 SX.
This pamphlet is intended to be used with the IBM Personal System/2
Hardware Maintenance Reference manual (part number 15F2190, form number
SBOF-3989-0) , and the Hardware Maintenance Service manual (part number
15F2200, form number SBOF-3988-0).
Part Number 10G6610
Form Number S10G-6610-00
IBM PS/2 Model 25 SX HMR
¦ Copyright IBM Corp. 1992
FRONT - 1

FRONT_1 Safety Information
Refer to the Hardware Maintenance Service General Information pamphlet for
the following safety information:
General Safety
Electrical Safety
Safety Inspection Guide.
First Edition (March 1992)
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 1992. All rights
reserved.
Note to U.S. 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 25 SX HMR
Safety Information
¦ Copyright IBM Corp. 1992
FRONT_1 - 1

FRONT_2 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
Subtopics
FRONT_2.1 General IBM Electro-Static Discharge (ESD) Instructions
IBM PS/2 Model 25 SX HMR
Notices
¦ Copyright IBM Corp. 1992
FRONT_2 - 1

FRONT_2.1 General IBM Electro-Static Discharge (ESD) Instructions
These are general instructions for handling ESD sensitive parts. Any part
containing transistors or ICs should be considered ESD Sensitive. Use
product specific ESD procedures when they exceed the requirements noted
here. ESD damage can occur when there is a difference in charge between
objects. We can protect against ESD damage, by equalizing the charge so
that the machine, the part, the work mat and the person handling the part
are all at the same charge. Ground is desirable but not required to
protect against ESD damage. The wrist band must be worn against the skin.
The grounding cord system should be selected to provide protection for the
specific service requirement. If an ESD sensitive part is swapped, the
mat must be used to provide an ESD safe work surface to protect the part
removed from the product. The mat may not be required for a simple
insertion. The mat may be used as a ESD protective container for swapping
parts between machines. The mat should be used with the BLACK side up.
The ESD ground clip can be attached to any frame ground, ground braid or
green wire ground. For products that are double insulated, or battery
operated, an ESD common ground or reference point should be used. The
round ground prong on the AC plug, can be used on AC operated products.
Coax or connector outside shells can be used on double insulated or
battery operated products.
ESD sensitive parts must not touch any part of your clothing. Most
clothing is insulative and retains a charge even when you are wearing a
wrist strap. Avoid contact with other people when handling ESD sensitive
parts. Keep ESD sensitive parts in protective packages until they are
inserted into the product.
IBM PS/2 Model 25 SX HMR
General IBM Electro-Static Discharge (ESD) Instructions
¦ Copyright IBM Corp. 1992
FRONT_2.1 - 1

CONTENTS Table of Contents
FRONT_1 Safety Information
FRONT_2 Notices
FRONT_2.1 General IBM Electro-Static Discharge (ESD) Instructions
CONTENTS Table of Contents
1.0 General Checkout
1.1 How to Diagnose Combined FRUs
1.2 How to Use Error Messages
1.3 How to Disable the Power-on Password
2.0 Undetermined Problem
3.0 Power Supply Voltages
4.0 Display
5.0 Installed Devices List
6.0 Keyboard
7.0 Printer
8.0 Memory
9.0 Hard Disk Drive Jumper Settings
9.1 40MB or 80MB Hard Disk Drive
10.0 Token-Ring Data Rate Switch Settings
11.0 Testing the Ethernet Adapter
11.1 RPL Error Conditions for Ethernet
12.0 Testing the Token-Ring Adapter
13.0 Symptom-to-FRU Index
14.0 Parts
14.1 How To Use The Parts Catalog
14.2 Example of a Parts List
15.0 System Overview
16.0 Parts Catalog
IBM PS/2 Model 25 SX HMR
Table of Contents
¦ Copyright IBM Corp. 1992
CONTENTS - 1

1.0 General Checkout
The diagnostic tests are intended to test only IBM* products. Non-IBM
products, prototype cards, or modified options can give false errors and
invalid system responses.
(*) Trademark of the International Business Machines
Corporation.
Subtopics
1.1 How to Diagnose Combined FRUs
1.2 How to Use Error Messages
1.3 How to Disable the Power-on Password
IBM PS/2 Model 25 SX HMR
General Checkout
¦ Copyright IBM Corp. 1992
1.0 - 1

1.1 How to Diagnose 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 the system board and that does not
correct the problem, replace the bus adapter and reinstall the original
system board.
IBM PS/2 Model 25 SX HMR
How to Diagnose Combined FRUs
¦ Copyright IBM Corp. 1992
1.1 - 1

1.2 How to Use 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 you did not receive any error code, see if the error
symptom is listed in the "Symptom-to-FRU Index" in topic 13.0.
IBM PS/2 Model 25 SX HMR
How to Use Error Messages
¦ Copyright IBM Corp. 1992
1.2 - 1

1.3 How to Disable the Power-on Password
To disable the power-on password, move the J2 jumper on the system board
to the unused position. Refer to the Model 25 SX Hardware Maintenance
Reference for the location of the J2 jumper on the system board.
+---+
¦001¦
+---+
- Power-off the system and all external devices.
- Check all cables and power cords.
- Make sure there is no diskette in the drive.
- Power-on all external devices.
- Power-on the system.
- Watch the screen for a POST error code.
DID YOU RECEIVE A POST ERROR CODE?
Yes No
¦ ¦
¦ +---+
¦ ¦002¦
¦ +---+
¦ Go to Step 010.
¦
+---+
¦003¦
+---+
IS THE ERROR 162?
Yes No
¦ ¦
¦ +---+
¦ ¦004¦
¦ +---+
¦ If the error is 106XX, go to "Symptom-to-FRU Index" in topic 13.0.
¦ If you suspect any other Ethernet network problem, go to "Testing the
¦ Ethernet Adapter" in topic 11.0.
¦
¦ If the error is 166XX, go to "Symptom-to-FRU Index" in topic 13.0.
¦ If you suspect any other Token-Ring network problem, go to "Testing
¦ the Token-Ring Adapter" in topic 12.0.
¦
¦ For any other error, go to Step 010.
¦
+---+
¦005¦
+---+
- Insert your advanced diagnostics diskette.
- Press Ctrl+Alt+Del and check for the following responses:
1. One or two short beeps.
2. IBM logo screen appears.
DID YOU RECEIVE BOTH RESPONSES?
Yes No
¦ ¦
¦ +---+
¦ ¦006¦
¦ +---+
¦ Go to "Symptom-to-FRU Index" in topic 13.0.
¦
¦ If that does not correct the problem, go to "Undetermined Problem" in
¦ topic 2.0.
¦
¦
+---+
¦007¦
+---+
- Press Enter.
HAS THE CONFIGURATION BEEN INTENTIONALLY CHANGED?
Yes No
¦ ¦
¦ +---+
¦ ¦008¦
¦ +---+
¦ Press N, then go to Step 012.
¦
+---+
¦009¦
+---+
Press Yto run Automatic Configuration and verify that the error is no
longer present. If you return to this point again, go to Step 007 and
answer No.
--------------------------------------------------------------------------
+---+
¦010¦
+---+
IBM PS/2 Model 25 SX HMR
How to Disable the Power-on Password
¦ Copyright IBM Corp. 1992
1.3 - 1

- Insert your advanced diagnostics diskette.
- Press Ctrl+Alt+Del and check for the following responses:
1. One or two short beeps.
2. IBM logo screen appears.
DID YOU RECEIVE BOTH RESPONSES?
Yes No
¦ ¦
¦ +---+
¦ ¦011¦
¦ +---+
¦ Go to "Symptom-to-FRU Index" in topic 13.0.
¦
¦ If that does not correct the problem, go to "Undetermined Problem" in
¦ topic 2.0.
¦
¦
+---+
¦012¦
+---+
- Select Test the System.
- Select System Checkout.
If the system has incorrect keyboard responses, go to "Keyboard" in
topic 6.0.
If the printer has incorrect responses, go to "Printer" in
topic 7.0.
If the display has problems such as jittering, rolling, shifting, or
being out-of-focus, go to "Display" in topic 4.0.
IS THE LIST OF INSTALLED DEVICES CORRECT?
Yes No
¦ ¦
¦ +---+
¦ ¦013¦
¦ +---+
¦ Go to "Installed Devices List" in topic 5.0.
¦
¦ If that does not resolve the problem, continue with Step 015.
¦
¦
+---+
¦014¦
+---+
- Run the advanced diagnostic tests.
DID THE TESTS IDENTIFY A FAILURE?
Note: If the test stops and you cannot continue, replace the last device
tested.
Yes No
¦ ¦
¦ ¦
¦ +---+
¦ ¦015¦
¦ +---+
¦ Check the "Symptom-to-FRU Index" in topic 13.0 for any POST error or
¦ other error symptom you might have. If your error symptom is not
¦ listed, go to "Undetermined Problem" in topic 2.0.
¦
¦ If you cannot find a problem, it may be intermittent:
¦ Check for damaged cables and connectors.
¦ Reseat all adapters, drives, and modules.
¦ Check the system unit fan for proper operation.
¦ Start an error log and run the tests multiple times. (Use a
¦ DOS-formatted diskette.)
¦
+---+
¦016¦
+---+
Follow the instructions on the display.
If that does not correct the problem, go to "Symptom-to-FRU Index" in
topic 13.0.
--------------------------------------------------------------------------
IBM PS/2 Model 25 SX HMR
How to Disable the Power-on Password
¦ Copyright IBM Corp. 1992
1.3 - 2

2.0 Undetermined Problem
Check the power supply voltages (see "Power Supply Voltages" in
topic 3.0). If the voltages are correct, return here and continue with
the following steps:
1. Power-off the system.
2. Remove or disconnect the following, one at a time:
a. Non-IBM devices
b. External devices (modem, printer, or mouse)
c. Math coprocessor
d. Any adapters
e. Bus adapter
f. Memory module kit
g. Hard disk drive (fixed disk drive) cable
h. Diskette drive cable.
3. Power-on the system.
4. Repeat steps 1 through 3 until you find the failing device or adapter.
If all devices and adapters have been removed and the problem continues,
replace the system board.
IBM PS/2 Model 25 SX HMR
Undetermined Problem
¦ Copyright IBM Corp. 1992
2.0 - 1

3.0 Power Supply Voltages
If the power-on indicator is not on, or if the power-supply fan is not
running, check the power cord for proper installation and continuity.
Verify that the voltage-selector switch is set for the correct voltage.
If these are correct, check the voltages listed in the following figures.
PICTURE 2
+------------------------------------------------------------------------+
¦ Vdc Minimum ¦ Vdc Maximum ¦ --Lead ¦ +Lead Pin ¦
¦ ¦ ¦ Pin ¦ ¦
+-----------------+------------------+-----------------+-----------------¦
¦ +4.8 ¦ +5.2 ¦ P6-5 ¦ P6-1 ¦
+-----------------+------------------+-----------------+-----------------¦
¦ +4.8 ¦ +5.2 ¦ P6-5 ¦ P6-10 ¦
+-----------------+------------------+-----------------+-----------------¦
¦ +4.5 ¦ +5.4 ¦ P6-9 ¦ P6-5 ¦
+-----------------+------------------+-----------------+-----------------¦
¦ +11.5 ¦ +12.6 ¦ P6-5 ¦ P6-3 ¦
+-----------------+------------------+-----------------+-----------------¦
¦ +10.8 ¦ +12.9 ¦ P6-4 ¦ P6-8 ¦
+-----------------+------------------+-----------------+-----------------¦
¦ ¦ ¦ ¦ ¦
+------------------------------------------------------------------------+
If the voltages are not correct, check the power cord for continuity. If
the power cord is good, replace the display assembly.
IBM PS/2 Model 25 SX HMR
Power Supply Voltages
¦ Copyright IBM Corp. 1992
3.0 - 1

4.0 Display
If the screen is rolling, replace the display assembly. If that does not
correct the problem, replace the system board.
If the screen is not rolling, do the following to run the display
self-test:
1. Power-off the system.
2. Unplug the display signal cable.
3. Power-on the system. (For an external display, also turn on the
display.)
4. Turn the brightness and contrast controls clockwise to their maximum
setting.
5. Check for the following conditions:
The screen should be white or light gray with a black margin. On
an external display, the black margin for the 8513, 8514 and 8515
displays should measure 2-20 mm (0.08-0.79 in.) wide on one or
both sides.
The contrast and brightness controls should vary the screen
intensity.
If both of these conditions are not present, replace the display
assembly.
If both conditions are present, replace the system board. If that
does not correct the problem, replace the display assembly.
IBM PS/2 Model 25 SX HMR
Display
¦ Copyright IBM Corp. 1992
4.0 - 1

5.0 Installed Devices List
Warning: A customized setup configuration (other than default settings)
may exist on the system you are servicing. Running Automatic
Configuration may alter those settings. Note the current configuration
settings (using the View Configuration option) and verify that the
settings are in place when service is complete. (For more information
about configuration, refer to the Model 25 SX Hardware Maintenance
Reference pamphlet.)
If the number of diskette drives shown in the installed devices list is
not correct, do the following:
1. Restart the system.
2. Correct the drive information in the Set Configuration menu.
3. Run the diagnostic tests.
If you cannot correct the drive information, replace FRUs, in the
following order, until the problem goes away: diskette drive; diskette
drive cable; system board.
If the number of hard disk drives shown in the installed devices list is
not correct, do the following:
1. Check the hard disk drive jumper settings (see "Hard Disk Drive Jumper
Settings" in topic 9.0).
2. Check the voltages to the hard disk drive (see "Power Supply Voltages"
in topic 3.0) and tighten all drive cables.
3. Restart the system and check the configuration.
If the drive is still missing from the installed devices list,
replace the drive.
If the problem remains, replace the drive cable. If that does not fix
the problem, replace the system board.
If any other adapter or device is missing from the installed devices list,
add it to the list and continue with the diagnostic tests.
Note: If you cannot add a missing adapter or device to the list, the
diagnostic code for it is not on the advanced diagnostic diskette.
Run the diagnostics provided with that device.
IBM PS/2 Model 25 SX HMR
Installed Devices List
¦ Copyright IBM Corp. 1992
5.0 - 1

6.0 Keyboard
Note: If a mouse or other pointing device is attached, remove it and see
if the error symptom goes away. If the symptom goes away, the
mouse or pointing device is defective.
+---+
¦001¦
+---+
- Power-off the system.
- Disconnect the keyboard cable from the keyboard.
- Power-on the system and check the keyboard cable connector for the
voltages shown. All voltages are ± 5%.
PICTURE 3
ARE THE VOLTAGES CORRECT?
Yes No
¦ ¦
¦ +---+
¦ ¦002¦
¦ +---+
¦ Possible failing FRUs are:
¦ 1. Keyboard cable
¦ 2. System board.
¦
+---+
¦003¦
+---+
Replace the keyboard.
--------------------------------------------------------------------------
IBM PS/2 Model 25 SX HMR
Keyboard
¦ Copyright IBM Corp. 1992
6.0 - 1

7.0 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 (with the wrap plug installed) do not
detect a failure, replace the printer cable. If that does not correct the
problem, replace the system board or adapter connected to the printer
cable.
IBM PS/2 Model 25 SX HMR
Printer
¦ Copyright IBM Corp. 1992
7.0 - 1

8.0 Memory
+---+
¦001¦
+---+
- Power-off the system.
- Insert the advanced diagnostics diskette into drive A.
- Power-on the system.
- Make a note of any POST errors you receive. Disregard 164 errors
(memory size).
DID YOU RECEIVE A XXXXXX XXXX 2XX POST ERROR?
Yes No
¦ ¦
¦ +---+
¦ ¦002¦
¦ +---+
¦ Press the F1 key to continue.
¦ - Run the memory tests. Use the RUN TESTS ONE TIME option.
¦
¦ DID THE MEMORY TESTS COMPLETE WITHOUT AN ERROR?
¦ Yes No
¦ ¦ ¦
¦ ¦ +---+
¦ ¦ ¦003¦
¦ ¦ +---+
¦ ¦ Follow the instructions on the display.
¦ ¦
¦ +---+
¦ ¦004¦
¦ +---+
¦ Your system memory is now functioning correctly. If you suspect an
¦ intermittent problem, start an error log. (Use a DOS-formatted
¦ diskette.)
¦ ----------------------------------------------------------------------
¦
+---+
¦005¦
+---+
Press the F1 key to continue.
- Run the memory tests. Use the RUN TESTS ONE TIME option. If you cannot
run the memory test or the test does not find a problem, remove the
memory module kit. If the problem goes away, replace the memory module
kit. If that does not fix the problem, replace the system board.
--------------------------------------------------------------------------
IBM PS/2 Model 25 SX HMR
Memory
¦ Copyright IBM Corp. 1992
8.0 - 1

9.0 Hard Disk Drive Jumper Settings
The hard disk drive must be set as the primary drive. To set the jumpers,
turn the drive upside down, with the connector facing away from you. The
drive has a jumper block in one of two positions. Refer to the following
figure, and set the jumper as shown.
Note: Do not change any other switches or jumpers.
Subtopics
9.1 40MB or 80MB Hard Disk Drive
IBM PS/2 Model 25 SX HMR
Hard Disk Drive Jumper Settings
¦ Copyright IBM Corp. 1992
9.0 - 1

9.1 40MB or 80MB Hard Disk Drive
PICTURE 4
IBM PS/2 Model 25 SX HMR
40MB or 80MB Hard Disk Drive
¦ Copyright IBM Corp. 1992
9.1 - 1

10.0 Token-Ring Data Rate Switch Settings
Switch 12 on the switch block indicates the rate (4 Mbps or 16 Mbps) at
which the adapter transfers data to the network. Set the switches as
shown to match the data rate of the LAN segment.
+------------------------------------------------------------------------+
¦ ¦ ¦
¦ ¦ ¦
¦ ¦ ¦
¦ Data Rate: ¦ PICTURE 5 ¦
¦ 16 Mbps ¦ ¦
¦ ¦ ¦
+------------------------------------+-----------------------------------¦
¦ ¦ ¦
¦ ¦ ¦
¦ ¦ ¦
¦ Data Rate: ¦ ¦
¦ 4 Mbps ¦ ¦
¦ ¦ ¦
¦ ¦ ¦
¦ ¦ ¦
¦ ¦ PICTURE 6 ¦
¦ ¦ ¦
¦ ¦ ¦
+------------------------------------------------------------------------+
IBM PS/2 Model 25 SX HMR
Token-Ring Data Rate Switch Settings
¦ Copyright IBM Corp. 1992
10.0 - 1