IBM PS/2 50 Owner's manual

FRONT
PICTURE 1
March 21, 1990
This pamphlet contains procedures for isolating problems to a FRU, a
Symptom-to-FRU Index, and a parts listing for the IBM(*) Personal
System/2(*) Model 50.
This pamphlet is intended to be used with the IBM Personal System/2
Hardware Maintenance Reference manual (part number 15F2190) and the IBM
Personal System/2 Hardware Maintenance Service manual (part number
15F2200).
Part Number 15F2193
Form Number S15F-2193-00
IBM PS/2 Model 50 HMS
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.
First Edition (March 1990)
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,
Armonk NY 10504.
¦ Copyright International Business Machines Corporation 1990. 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 50 HMS
Safety Information
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.
IBM PS/2 Model 50 HMS
Special Notices
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 Automatic Configuration
2.2 Device Type
2.3 SCSI Devices
2.4 Non-SCSI Devices
3.0 Power-On Password
4.0 Undetermined Problem
5.0 Power Supply Voltages / Fan
6.0 Enable and Disable Settings
7.0 Display Self-Test
8.0 Display Adapter 8514/A
9.0 Keyboard
10.0 Printer
11.0 Memory
12.0 Symptom-to-FRU Index
13.0 System Overview
14.0 How To Use This Parts Catalog
14.1 Example of a Parts List
15.0 Parts
IBM PS/2 Model 50 HMS
Table of Contents
CONTENTS - 1

1.0 General Checkout
The advanced 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.
IMPORTANT:
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 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.
+---+
¦001¦
+---+
- Power-off the system and all external devices.
- Check all cables and power cords.
- Make sure there are no diskettes in the drives.
- Power-on all external devices.
- Power-on the system.
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¦
¦ +---+
¦ Continue with Step 014.
¦
+---+
¦007¦
+---+
IS THE FIRST POST ERROR CODE WITHIN THE RANGE OF 02080000 190I TO 02410000
190I?
Yes No
¦ ¦
¦ +---+
¦ ¦008¦
¦ +---+
¦ Continue with Step 014.
¦
+---+
¦009¦
+---+
- Start the Reference Diskette and verify that the "Enable" and "Disable"
settings are correct. For more information, go to "Enable and Disable
Settings" in topic 6.0. 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 12.0. Before replacing any
¦ SCSI devices, verify there are no duplicate SCSI ID settings.
¦
+---+
¦011¦
IBM PS/2 Model 50 HMS
General Checkout
1.0 - 1

+---+
- Remove the Reference Diskette and restart the system.
DID THE ERROR REMAIN?
Yes No
¦ ¦
¦ +---+
¦ ¦012¦
¦ +---+
¦ If you suspect another problem, or want to run system checkout,
¦ continue with Step 014.
¦
+---+
¦013¦
+---+
Go to "Symptom-to-FRU Index" in topic 12.0.
--------------------------------------------------------------------------
+---+
¦014¦
+---+
- Insert your Reference 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 THE RESPONSES LISTED ABOVE?
Yes No
¦ ¦
¦ +---+
¦ ¦015¦
¦ +---+
¦ Go to "Symptom-to-FRU Index" in topic 12.0.
¦ - or -
¦ If that does not correct the problem, go to "Undetermined Problem" in
¦ topic 4.0.
¦
+---+
¦016¦
+---+
- Advance to the Main Menu.
- Press Ctrl-A and run system checkout.
Notes:
1. If the system has incorrect keyboard responses, go to "Keyboard" in
topic 9.0.
2. If the printer has incorrect responses, go to "Printer" in
topic 10.0.
3. If the display has problems such as jittering, rolling, shifting, or
being out-of-focus, go to "Display Self-Test" in topic 7.0.
4. A minimum of 512KB of memory must be active to load the diagnostic
tests.
IS THE LIST OF INSTALLED DEVICES CORRECT?
Yes No
¦ ¦
¦ +---+
¦ ¦017¦
¦ +---+
¦ Go to "Installed Devices List" in topic 2.0.
¦
+---+
¦018¦
+---+
- Run the 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¦
¦ +---+
¦ You may have an intermittent problem:
¦ 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.
¦
+---+
IBM PS/2 Model 50 HMS
General Checkout
1.0 - 2

¦020¦
+---+
Follow the action described on the screen. If that does not correct the
problem go to "Symptom-to-FRU Index" in topic 12.0.
--------------------------------------------------------------------------
IBM PS/2 Model 50 HMS
General Checkout
1.0 - 3

2.0 Installed Devices List
If an adapter or device is missing from the list, you may have one of the
following conditions:
Your Reference Diskette does not contain the module of code required
to support that device.
The missing device is a 5.25-Inch 360KB External Diskette Drive
adapter or another unrecognizable adapter.
The missing device is defective.
An adapter is defective.
Subtopics
2.1 Automatic Configuration
2.2 Device Type
2.3 SCSI Devices
2.4 Non-SCSI Devices
IBM PS/2 Model 50 HMS
Installed Devices List
2.0 - 1

2.1 Automatic Configuration
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 Hardware Maintenance Reference manual.)
IBM PS/2 Model 50 HMS
Automatic Configuration
2.1 - 1

2.2 Device Type
Run Automatic Configuration (see "Automatic Configuration" in topic 2.1
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 50 HMS
Device Type
2.2 - 1

2.3 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 all internal and external cables
attached to the SCSI adapter.
2. Terminate the adapter, as required.
Warning: See "Automatic Configuration" in topic 2.1 before continuing.
3. Power-on the system and run Automatic Configuration. 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 it. If the adapter passes the
tests, a different adapter may be defective.
5. Reconnect the cables to the SCSI adapter, then terminate the adapter,
as required.
6. Go to "Undetermined Problem" in topic 4.0 to find the problem.
IBM PS/2 Model 50 HMS
SCSI Devices
2.3 - 1

2.4 Non-SCSI Devices
The missing device is defective. If that does not correct the problem, go
to "Undetermined Problem" in topic 4.0.
Note: If the number of diskette drives shown on the list is incorrect, an
error can occur during the tests. Restart the system and verify
that the drive information on the Set Configuration menu is
correct, then continue testing.
IBM PS/2 Model 50 HMS
Non-SCSI Devices
2.4 - 1

3.0 Power-On Password
To service a system with an active, unknown, power-on password do one of
the following, depending on which battery and speaker assembly is
installed.
On the type with two pins on the side of the speaker assembly, short
the pins together.
On the type with no pins, insert a meter lead into the connector
(protruding from under the battery) and short the other end of the
lead to frame ground.
Power-on the system and leave the assembly shorted until completion of
POST. This deactivates the password.
IBM PS/2 Model 50 HMS
Power-On Password
3.0 - 1

4.0 Undetermined Problem
1. Power-off the system.
2. Remove or disconnect one of the following adapters or devices.
Non-IBM devices
Any external device (modem, printer, or mouse)
Math Coprocessor
Any adapter
Fixed disk or diskette drive
Memory module kits.
3. Power on the system.
4. If the symptom remains, repeat the above steps until you find the
failing adapter or device.
5. If all adapters and devices have been removed and the problem remains,
check the power supply voltages. If the voltages are correct, replace
the system board. If the voltages are not correct, replace the power
supply.
IBM PS/2 Model 50 HMS
Undetermined Problem
4.0 - 1

5.0 Power Supply Voltages / Fan
If the fan is not running, check the fan connector for -9.0 to -15.0 Vdc,
approximately -12 Vdc desired. If the voltage is correct, replace the
fan. If the voltage is not correct, check the power supply voltages.
PICTURE 2
Remove the power supply and place it with the connector facing up.
Power-on the power supply and check for the voltages listed below. If the
voltages are not correct, check the power cord for continuity. If the
power cord is good, replace the power supply.
+------------------------------------------------------------------------+
¦ Vdc ¦ Vdc ¦ -Lead ¦ +Lead ¦
¦ Minimum ¦ Maximum ¦ Pin ¦ Pin ¦
+---------+---------+---------+------------------------------------------¦
¦ ¦ ¦ ¦ ¦
¦ -9 ¦ -15.0 ¦ 2 ¦ 1 ¦
¦ +9.0 ¦ +15.0 ¦ 2 ¦ 3 ¦
¦ +3.7 ¦ +6.2 ¦ 2 ¦ 15 ¦
¦ ¦ ¦ ¦ ¦
+------------------------------------------------------------------------¦
+------------------------------------------------------------------------+
PICTURE 3
IBM PS/2 Model 50 HMS
Power Supply Voltages / Fan
5.0 - 1

6.0 Enable and Disable Settings
To verify that the "Enable" and "Disable" settings are correct, select Set
and View SCSI Device Configuration from the Set Configuration menu, and
determine if there are any "Presence Error Reporting" devices listed. The
settings must be as follows:
Devices connected to the system must be set to "Enabled."
Devices listed but not connected must be set to "Disabled."
Change the settings by pressing the F5 key; then save them by pressing the
F10 key.
IBM PS/2 Model 50 HMS
Enable and Disable Settings
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 (some
shading may occur near the edges). If the screen differs, replace the
display. If the display passes the test, replace the system board or
display adapter that the display is attached to.
8503, 8512, 8513, 8514: 2-20 mm (0.08-0.79 in.) wide on one or both
sides.
8506: 2-35 mm (0.08-1.38 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.
IBM PS/2 Model 50 HMS
Display Self-Test
7.0 - 1

8.0 Display Adapter 8514/A
PICTURE 4
IBM PS/2 Model 50 HMS
Display Adapter 8514/A
8.0 - 1

9.0 Keyboard
+---+
¦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 5
ARE THE VOLTAGES CORRECT?
Yes No
¦ ¦
¦ +---+
¦ ¦002¦
¦ +---+
¦ Possible failing FRUs are:
¦ 1. Fuse, or keyboard cable.
¦ 2. System board.
¦
+---+
¦003¦
+---+
Replace the keyboard.
--------------------------------------------------------------------------
IBM PS/2 Model 50 HMS
Keyboard
9.0 - 1

10.0 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 of
the following FRUs is failing:
System board
Parallel adapter
Printer cable.
IBM PS/2 Model 50 HMS
Printer
10.0 - 1