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IBM PS/2 N51 SX Hardware Maintenance Service

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IBM PS/2 Model N51 SX HMS
FRONT
PICTURE 1
October 22, 1991
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 N51 SX.
This pamphlet is intended to be used with the IBM Personal System/2
Hardware Maintenance Reference manual (part number 15F2190, form number
S15F-2190-00) and the IBM Personal System/2 Hardware Maintenance Service
manual (part number 15F2200, form number S15F-2200-00).
Part Number 04G5112
Form Number S04G-5112-00
¦ Copyright IBM Corp. 1991
FRONT - 1

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Summary of Contents for IBM PS/2 N51 SX

  • Page 1 Symptom-to-FRU Index, and a parts listing for the IBM Personal System/2 Model N51 SX. This pamphlet is intended to be used with the IBM Personal System/2 Hardware Maintenance Reference manual (part number 15F2190, form number S15F-2190-00) and the IBM Personal System/2 Hardware Maintenance Service manual (part number 15F2200, form number S15F-2200-00).

  • Page 2: Safety Information

    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.

  • Page 3: Notices

    Notices 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.

  • Page 4: Trademarks And Service Marks

    Trademarks and Service Marks FRONT_2.1 Trademarks and Service Marks The following terms, denoted by an asterisk (*) in this publication, are trademarks of the IBM Corporation in the United States and/or other countries: Personal System/2. ¦ Copyright IBM Corp. 1991...

  • Page 5: Table Of Contents

    IBM PS/2 Model N51 SX HMS Table of Contents CONTENTS Table of Contents FRONT_1 Safety Information FRONT_2 Notices FRONT_2.1 Trademarks and Service Marks CONTENTS Table of Contents General Checkout How to Diagnose Combined FRUs How to Use Error Messages How to Disable the Power-On Password...

  • Page 6: General Checkout

    IBM PS/2 Model N51 SX HMS General Checkout 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. Warning: Drives in the system you are servicing might have been rearranged or the drive startup sequence might have been altered.
  • Page 7 IBM PS/2 Model N51 SX HMS How to Diagnose Combined FRUs 1.1 How to Diagnose Combined FRUs If an adapter or device consists of more than one FRU, an error code can 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.
  • Page 8 IBM PS/2 Model N51 SX HMS How to Use Error Messages 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, begin the diagnosis with the first error code.
  • Page 9 IBM PS/2 Model N51 SX HMS How to Disable the Power-On Password 1.3 How to Disable the Power-On Password To disable the power-on password, do the following: Power-off the system. Remove the battery pack and the bottom cover. Identify the password-override connector on the system board.
  • Page 10 IBM PS/2 Model N51 SX HMS How to Disable the Power-On Password topic 3.0 . Notes: If the system has an incorrect keyboard or numeric keypad response, go to "Keyboard" in topic 6.0. If the printer has incorrect responses, go to "Printer" in topic 7.0.

  • Page 11: Installed Devices List

    IBM PS/2 Model N51 SX HMS Installed Devices List 2.0 Installed Devices List The Installed Devices List shows the presence of devices on the system. If an adapter or device is missing from the list, you may have one of the following conditions.

  • Page 12: Undetermined Problem

    IBM PS/2 Model N51 SX HMS Undetermined Problem 3.0 Undetermined Problem You are here because the diagnostics tests did not identify the failing FRU. Check the power supply in use (see "Power Supply" in topic 5.0). If the power supply is operating correctly, return here and continue with the following procedure.

  • Page 13: Hard Disk Partition

    IBM PS/2 Model N51 SX HMS Hard Disk Partition 4.0 Hard Disk Partition A protected partition on the hard disk contains the system configuration data set, system setup programs, and customer and advanced diagnostics. System setup and diagnostic programs can be loaded from this partition by...
  • Page 14 IBM PS/2 Model N51 SX HMS Restoring the Partition 4.1 Restoring the Partition If a system or hard disk problem prevents system setup or diagnostic programs from being loaded from the protected partition, load and run the programs from the Reference Diskette.
  • Page 15 IBM PS/2 Model N51 SX HMS Setting System Configuration 4.2 Setting System Configuration If you configure the system using the 4. Set configuration from the Reference Diskette, make sure the languages of the Reference Diskette and the system must match.

  • Page 16: Power Supply

    IBM PS/2 Model N51 SX HMS Power Supply 5.0 Power Supply As the battery pack, backup and standby batteries have a given lifespan, having spares of these batteries on hand can eliminate problems. When one of these batteries is suspected of failing, the spare can be used in its place.
  • Page 17 IBM PS/2 Model N51 SX HMS Power Supply +---+ ¦011¦ +---+ - Run advanced diagnostics for all devices using the AC adapter. Use the 'RUN TEST ONE TIME' option. DID ALL THE TESTS END WITHOUT AN ERROR? ¦ ¦ ¦...

  • Page 18: Checking The Ac Adapter

    IBM PS/2 Model N51 SX HMS Power Supply Replace the voltage converter to verify the fix. If the problem still remains, do the following. - Suspect one of the options or devices. Reinstall each of the options or devices to the system one at a time, and power-on the system to see if the original problem occurs.
  • Page 19 IBM PS/2 Model N51 SX HMS Checking the AC Adapter 5.1 Checking the AC Adapter If the Power-On indicator is not on, check the power cord of the AC adapter for proper installation and continuity. If any noise can be heard from the AC adapter when it is plugged into line voltage, replace the AC adapter with a new one.
  • Page 20 IBM PS/2 Model N51 SX HMS Checking the Car Battery Adapter 5.2 Checking the Car Battery Adapter If an output voltage from a cigarette lighter socket is less than 10.5 V dc, the power-on indicator on the car battery adapter blinks and a noise can be heard continuously.
  • Page 21 IBM PS/2 Model N51 SX HMS Checking the Battery Pack 5.3 Checking the Battery Pack Invert the system unit and place it on its top. Remove the battery pack and measure the voltage at the battery terminals between 1 (+) and 3 (-).
  • Page 22 IBM PS/2 Model N51 SX HMS Checking the Backup Battery 5.4 Checking the Backup Battery Invert the system unit and place it on its top. Remove the bottom cover. Disconnect the battery connector from the voltage converter. Measure the voltage of the backup battery.
  • Page 23 IBM PS/2 Model N51 SX HMS Checking the Standby Battery 5.5 Checking the Standby Battery Invert the system unit and place it on its top. Remove the battery pack from the system and remove the bottom cover. Disconnect the battery connector from the voltage converter.
  • Page 24 IBM PS/2 Model N51 SX HMS Checking the Quick Charger 5.6 Checking the Quick Charger If a strange noise can be heard from the operating quick charger, replace Perform steps 1 through 3 in topic 5.3 of the "Checking the Battery Pack"...
  • Page 25 IBM PS/2 Model N51 SX HMS Checking the Voltage Converter 5.7 Checking the Voltage Converter Use the following procedure to isolate the voltage converter from the problem. Note: If the problem occurs only when using the system with a good battery pack, replace the voltage converter.

  • Page 26: Keyboard

    IBM PS/2 Model N51 SX HMS Keyboard 6.0 Keyboard If the system has no response when the numeric keypad is used: Disconnect the numeric keypad from the system. Repeat the failing operation. If the problem does not appear, replace the numeric keypad.

  • Page 27: Printer

    IBM PS/2 Model N51 SX HMS Printer 7.0 Printer Make sure the printer is properly connected and powered on. 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.

  • Page 28: External Display Self-Test

    IBM PS/2 Model N51 SX HMS External Display Self-Test 8.0 External Display Self-Test If the display problem occurs only when using an external display, use the following instructions to correct the problem. If the screen is rolling, replace the display assembly.

  • Page 29: Memory

    IBM PS/2 Model N51 SX HMS Memory 9.0 Memory Customer diagnostics can eliminate defective memory so no memory error code appears at power-on reset. After you replace a defective memory module kit, run 5. Automatic configuration or the new memory will not be recognized.

  • Page 30: Symptom-To-Fru Index

    IBM PS/2 Model N51 SX HMS Symptom-to-FRU Index 10.0 Symptom-to-FRU Index The Symptom-to-FRU Index lists error symptoms and possible causes. most likely cause is listed first. Always begin with "General Checkout" in topic 1.0. This index also can be used to help you decide which FRUs to have available when servicing a system.
  • Page 31 IBM PS/2 Model N51 SX HMS No-Beep Symptoms 10.1 No-Beep Symptoms +------------------------------------------------------------------------+ ¦ Symptom/Error ¦ FRU/Action ¦ +------------------------------------+-----------------------------------¦ ¦ No beep and a blank or unreadable ¦ System Board ¦ ¦ display during POST. ¦ Any option or device ¦...
  • Page 32 IBM PS/2 Model N51 SX HMS Beep Symptoms 10.2 Beep Symptoms +------------------------------------------------------------------------+ ¦ Symptom/Error ¦ FRU/Action ¦ +------------------------------------+-----------------------------------¦ ¦ Continuous beep. ¦ System Board ¦ +------------------------------------+-----------------------------------¦ ¦ Repeating short beeps. ¦ Keyboard ¦ ¦ (See "Keyboard" in topic 6.0 ¦ Keyboard Control Card ¦...
  • Page 33 IBM PS/2 Model N51 SX HMS Miscellaneous Symptoms 10.3 Miscellaneous Symptoms +------------------------------------------------------------------------+ ¦ Symptom/Error ¦ FRU/Action ¦ +------------------------------------+-----------------------------------¦ ¦ LCD too dark, unable to adjust ¦ LCD Inverter ¦ ¦ contrast or brightness. ¦ LCD Panel ¦ ¦ ¦ System Board ¦...
  • Page 35 IBM PS/2 Model N51 SX HMS Numeric Error Codes 10.4 Numeric Error Codes +------------------------------------------------------------------------+ ¦ Symptom/Error ¦ FRU/Action ¦ +------------------------------------+-----------------------------------¦ ¦ 00010200, 00010300, 00010400, ¦ System Board ¦ ¦ 00010700 ¦ ¦ +------------------------------------+-----------------------------------¦ ¦ 00010800 ¦ System Board ¦ ¦...
  • Page 36 IBM PS/2 Model N51 SX HMS Numeric Error Codes ¦ 0004XXXX ¦ System Board ¦ ¦ ¦ Any Parallel Device ¦ ¦ ¦ Communication Cable ¦ ¦ ¦ I/O Panel Assembly ¦ +------------------------------------+-----------------------------------¦ ¦ 000601XX ¦ Diskette Drive ¦ ¦...
  • Page 37 IBM PS/2 Model N51 SX HMS Numeric Error Codes ¦ ¦ 2. Select Set startup sequence. ¦ ¦ ¦ 3. Check the list of devices on ¦ ¦ ¦ the screen. ¦ +------------------------------------+-----------------------------------¦ ¦ I9990302 ¦ Make sure that an operating ¦...

  • Page 38: How To Use This Parts Catalog

    IBM PS/2 Model N51 SX HMS How To Use This Parts Catalog 11.0 How To Use This Parts Catalog INDEX REFERENCE NUMBERS: Refer to the illustrations for the index reference numbers that are listed in the left margin of the parts listing.

  • Page 39: System Overview

    IBM PS/2 Model N51 SX HMS System Overview 12.0 System Overview PICTURE 12 ¦ Copyright IBM Corp. 1991 12.0 - 1...

  • Page 40: Parts

    IBM PS/2 Model N51 SX HMS Parts 13.0 Parts Index System Unit LCD Bezel 07G1741 LCD Bezel for Japan 07G1842 Bumper, Rubber 07G1742 LCD Panel 07G1737 Cable, LCD 07G1739 LCD Rear Cover 07G1740 LCD Rear Cover for Japan 07G1841 Inverter, LCD...
  • Page 41 IBM PS/2 Model N51 SX HMS Parts Spanish 07G1559 Swedish 07G1561 Swiss / French 07G1564 Swiss / German 07G1565 Turkish 07G1568 U.K. 07G1554 U.S. English for EMEA 07G1553 Options and Adapters Note: When you replace the AC adapter or the Quick Charger with a new one, use the one available for the country you are in even though the system is from another country.
  • Page 42 IBM PS/2 Model N51 SX HMS Parts 8503 Monochrome Display (with Tilt /Swivel Stand) 110/120 V ac 68X3045 220/240 V ac (Northern Hemisphere) 68X3046 220/240 V ac (Southern Hemisphere) 72X7878 Tilt /Swivel Stand 68X3061 8506 Monochrome Display (with Tilt /Swivel Stand)
  • Page 43 IBM PS/2 Model N51 SX HMS Parts Power Cord, System Unit, for: 14F0069 Italy Power Cord, System Unit, for: 13F9940 Australia, New Zealand Power Cord, System Unit, for: 13F9997 Denmark Power Cord, System Unit, for: 14F0087 Israel Power Cord, System Unit, for:...

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