IBM PS/2 95 XP 486 Hardware Maintenance Reference
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IBM PS/2 95 XP 486 Hardware Maintenance Reference

IBM PS/2 95 XP 486 Hardware Maintenance Reference

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IBM PS/2 Model 95 XP 486 HMR
FRONT
PICTURE 1
Part Number 04G3393
Form Number S15F-2246-02
October 22, 1991
¦ Copyright IBM Corp. 1990, 1991
FRONT - 1

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  • Page 1 IBM PS/2 Model 95 XP 486 HMR FRONT PICTURE 1 Part Number 04G3393 Form Number S15F-2246-02 October 22, 1991 ¦ Copyright IBM Corp. 1990, 1991 FRONT - 1...

  • Page 2: Edition Notice

    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: Special Notices

    Special Notices FRONT_1 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.
  • Page 4 IBM PS/2 Model 95 XP 486 HMR Table of Contents CONTENTS Table of Contents EDITION Edition Notice FRONT_1 Special Notices CONTENTS Table of Contents Product Description Security 1.1.1 Cover Lock 1.1.2 Power-On Password System Features 1.2.1 Processor Board 1.2.2 CMOS RAM and CMOS RAM Extension 1.2.3...

  • Page 5: Product Description

    IBM PS/2 Model 95 XP 486 HMR Product Description 1.0 Product Description The IBM (*) Personal System/2 (*) Model XP (*) 486 computers use the IBM Micro Channel (*) architecture. The features of the various types of the Model 95 are:...
  • Page 6 IBM PS/2 Model 95 XP 486 HMR Security 1.1 Security Subtopics 1.1.1 Cover Lock 1.1.2 Power-On Password ¦ Copyright IBM Corp. 1990, 1991 1.1 - 1...

  • Page 7: Cover Lock

    IBM PS/2 Model 95 XP 486 HMR Cover Lock 1.1.1 Cover Lock The cover lock is on the front panel of the system unit. The lock secures the front bezel and side cover and can be unlocked with the user's key.

  • Page 8: Power-On Password

    IBM PS/2 Model 95 XP 486 HMR Power-On Password 1.1.2 Power-On Password A power-on password denies access to the system by an unauthorized user when the system is powered-on. When a power-on password is active, the password prompt (which resembles a small key) appears on the screen each time the system is powered-on (except when the system is in the Unattended Start Mode).

  • Page 9: System Features

    IBM PS/2 Model 95 XP 486 HMR System Features 1.2 System Features The major features of the system are: Processor board CMOS RAM Initial Machine Loading (IML) Basic Input/Output System (BIOS) Power-on Self-Test (POST) Graphics array (VGA and XGA) adapter...

  • Page 10: Processor Board

    IBM PS/2 Model 95 XP 486 HMR Processor Board 1.2.1 Processor Board The processor board is connected to the system through two dedicated in-line system-board connectors. The major components on the processor board are the system microprocessor, the system clock, the direct memory access (DMA) controller, and the memory controller.
  • Page 11 IBM PS/2 Model 95 XP 486 HMR CMOS RAM and CMOS RAM Extension 1.2.2 CMOS RAM and CMOS RAM Extension CMOS RAM provides 64 bytes of storage. Fifty bytes are used to store system configuration and security information. The real-time clock uses the remaining 14 bytes to track the date, time, and battery level.
  • Page 12 IBM PS/2 Model 95 XP 486 HMR IML, POST, and BIOS 1.2.3 IML, POST, and BIOS The Model 95 uses Initial Machine Load (IML) to store the power-on self-test (POST) and Basic Input/Output System (BIOS) code. With IML, some of the code is stored in ROM and is used for preliminary testing during power-on;...
  • Page 13 IBM PS/2 Model 95 XP 486 HMR Graphics Array 1.2.4 Graphics Array The graphics array is located on the XGA Display Adapter/A and operates in two video modes: VGA compatibility mode XGA compatibility mode. The adapter comes with four video-memory modules (512KB) installed.

  • Page 14: Serial Port

    IBM PS/2 Model 95 XP 486 HMR Serial Port 1.2.5 Serial Port The serial port is fully programmable and supports asynchronous communications. The 25-pin, D-shell connector provides the signals to drive a device with a standard 25-contact RS-232 connector. The connected device is identified by the system configuration as SERIAL 1 through SERIAL 8.

  • Page 15: Parallel Port

    IBM PS/2 Model 95 XP 486 HMR Parallel Port 1.2.6 Parallel Port The parallel port allows the attachment of devices that accept eight bits of parallel data at standard transistor-transistor logic (TTL) levels. The port has a 25-pin, D-shell connector and is designed primarily for printers.

  • Page 16: Diskette Drive Controller

    IBM PS/2 Model 95 XP 486 HMR Diskette-Drive Controller 1.2.7 Diskette-Drive Controller The controller connects to the diskette drives through a single 40-pin cable on the system board. Signals and voltages are supplied through the diskette-drive cable that plugs into the connector.
  • Page 17 IBM PS/2 Model 95 XP 486 HMR Keyboard Connector and Pointing-Device Connector 1.2.8 Keyboard Connector and Pointing-Device Connector The two 6-pin connectors on the rear of the system board are for a keyboard and a pointing device (mouse). The keyboard connector is marked with a small keyboard figure molded into the back panel;...

  • Page 18: System Memory

    IBM PS/2 Model 95 XP 486 HMR System Memory 1.3 System Memory The figure below shows the location of the memory-module-kit connectors B1 to A4 on the system board. PICTURE 2 The system board has eight connectors for system-board memory-module kits.
  • Page 19 IBM PS/2 Model 95 XP 486 HMR System Memory ¦ Kits ¦ ¦ Disabled ¦ Usable ¦ +-----------------+------------------+-----------------+-----------------¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ 1MB ¦ 1MB ¦ 2MB ¦ 0MB ¦ ¦ 2MB ¦ 1MB ¦...
  • Page 20 IBM PS/2 Model 95 XP 486 HMR Option Compatibility 2.0 Option Compatibility The Model 95 uses only those adapters that are specifically designed for All supported 16-bit and 32-bit adapters operate in any system-board expansion slot. For supported options, see the Parts section in the Hardware Maintenance Service pamphlet for the system you are servicing.
  • Page 21 IBM PS/2 Model 95 XP 486 HMR Drive and Diskette Compatibility 2.1 Drive and Diskette Compatibility The following provides information concerning the identification of diskette drives. +------------------------------------------------------------------------+ ¦ Diskette Drive ¦ Identifying Mark ¦ +------------------------------------+-----------------------------------¦ +------------------------------------+-----------------------------------¦ ¦ 3.5 Inch - 720KB ¦...
  • Page 22 IBM PS/2 Model 95 XP 486 HMR Hard Disk and Diskette Drives 2.2 Hard Disk and Diskette Drives The Model 95 comes with a Small Computer System Interface (SCSI) hard disk drive and SCSI adapter. Up to five SCSI devices can be installed inside the system.
  • Page 23 IBM PS/2 Model 95 XP 486 HMR Terminators 2.3 Terminators Terminator requirements are: Diskette Drives: do not require terminators. Hard Disk Drives and other storage devices: The last device in any SCSI chain must have the terminator installed. (Some devices may have more than one terminator.) All other optional SCSI devices installed inside the system unit must have the terminators removed.

  • Page 24: Operating Requirements

    IBM PS/2 Model 95 XP 486 HMR Operating Requirements 3.0 Operating Requirements This section describes the operations that occur from the time the system is powered-on until the minimum operating requirements have been met. Subtopics 3.1 Power Supply ¦ Copyright IBM Corp. 1990, 1991...

  • Page 25: Power Supply

    IBM PS/2 Model 95 XP 486 HMR Power Supply 3.1 Power Supply The power supply can be manually switched to support either the 100-125 Vac range or 200-240 Vac range. The ac input is converted to dc outputs that supply the system with proper operating voltages.
  • Page 26 IBM PS/2 Model 95 XP 486 HMR Reference Diskette 4.0 Reference Diskette There are two types of Model 95 Reference Diskettes. The type of processor board installed in the system determines which Reference Diskette is required. Note: For more information, see "Processor Board and Reference Diskette Matrix"...
  • Page 27 IBM PS/2 Model 95 XP 486 HMR Installing a New Version of the Reference Diskette 4.1 Installing a New Version of the Reference Diskette Note: When you install the new Reference Diskette onto the hard disk, it writes over all the files (including option files) in the system partition.
  • Page 28 IBM PS/2 Model 95 XP 486 HMR Making a Backup Copy of The System Partition 4.2 Making a Backup Copy of The System Partition Note: You will need a blank 2.0MB diskette (or the old backup copy of the system partition).
  • Page 29 IBM PS/2 Model 95 XP 486 HMR Diagnostic Programs and Information 4.3 Diagnostic Programs and Information See the IBM Personal System/2 Micro Channel Diagnostics pamphlet for information on the following: System Programs Selectable Startup Function POST Advanced Diagnostic Programs Presence Test...

  • Page 30: Specifications

    IBM PS/2 Model 95 XP 486 HMR Specifications 5.0 Specifications Size Depth: 508 mm (20.0 in) Height: 501 mm (19.75 in) Width: 203 mm (8.0 in). Weight Minimum configuration: 22 kg (50 lb) Maximum configuration: 30 kg (67 lb). Environment...

  • Page 31: Special Tools

    Volt-Ohm Meter A meter similar to the Triplett Model 310. (1) Wrap Plug The Tri-Connector Wrap Plug (IBM part 72X8546) is used during advanced diagnostic tests of the parallel ports and the serial ports. PICTURE 3 (1) Manufactured by Triplett Corporation, Bluffton, Ohio 45817, U.S.A.

  • Page 32: Removals And Replacements

    IBM PS/2 Model 95 XP 486 HMR Removals and Replacements 7.0 Removals and Replacements The recommended service position of the Model 95 is upright. necessary, you may place the system on its left side for servicing. CAUTION: The system unit with options may weigh as much as 30 kilograms (67 pounds).
  • Page 33 IBM PS/2 Model 95 XP 486 HMR 1005 Cover and Front Bezel 7.1 1005 Cover and Front Bezel PICTURE 4 ¦ Copyright IBM Corp. 1990, 1991 7.1 - 1...
  • Page 34 IBM PS/2 Model 95 XP 486 HMR 1010 Cover Lock 7.2 1010 Cover Lock Cover and Front Bezel (1005) PICTURE 5 ¦ Copyright IBM Corp. 1990, 1991 7.2 - 1...
  • Page 35 IBM PS/2 Model 95 XP 486 HMR 1015 Drive Retainer and Bezels 7.3 1015 Drive Retainer and Bezels Cover and Front Bezel (1005) PICTURE 6 ¦ Copyright IBM Corp. 1990, 1991 7.3 - 1...
  • Page 36 IBM PS/2 Model 95 XP 486 HMR 1020 Information Panel Assembly 7.4 1020 Information Panel Assembly Cover and Front Bezel (1005) Drive Retainer and Bezels (1020) Disconnect any cables necessary for removal. PICTURE 7 ¦ Copyright IBM Corp. 1990, 1991...
  • Page 37 IBM PS/2 Model 95 XP 486 HMR 1025 Diskette Drive 7.5 1025 Diskette Drive Cover and Front Bezel (1005) Drive Retainer and Bezels (1015) Disconnect any cables necessary for removal. Notes: You must only install drives designed for this system.

  • Page 38: 1030 Hard Disk Drive

    IBM PS/2 Model 95 XP 486 HMR 1030 Hard Disk Drive 7.6 1030 Hard Disk Drive Warning: Improper shipping and handling can result in permanent loss of all data and formatting on the hard disk drive. Have the user back up all information from the hard disk drive.
  • Page 39 IBM PS/2 Model 95 XP 486 HMR 1035 Adapters and Adapter Guide 7.7 1035 Adapters and Adapter Guide Note: When replacing the processor board, be sure to push the levers in toward the expansion slot until they lock into place.
  • Page 40 IBM PS/2 Model 95 XP 486 HMR 1040 487SX Processor (extended math capability) 7.8 1040 487SX Processor (extended math capability) Cover and Front Bezel (1005) Adapters and Adapter Guide (1035) Disconnect any cables necessary for removal Carefully insert the tip of a screwdriver between the processor and the connector edge and gently twist the screwdriver (around all edges) until the processor raises up.
  • Page 41 IBM PS/2 Model 95 XP 486 HMR 1045 Power Supply 7.9 1045 Power Supply Cover and Front Bezel (1005) Disconnect any cables necessary for removal. PICTURE 12 ¦ Copyright IBM Corp. 1990, 1991 7.9 - 1...
  • Page 42 IBM PS/2 Model 95 XP 486 HMR 1050 Memory Module Kit 7.10 1050 Memory Module Kit Cover and Front Bezel (1005) Power Supply (1045) (Steps 2 and 3 only) Notes: If memory is added or removed, run the set configuration program from the hard disk drive to reset the system-configuration information.
  • Page 43 IBM PS/2 Model 95 XP 486 HMR 1055 Battery 7.11 1055 Battery Cover and Front Bezel (1005) Power Supply (1045) CAUTION: The lithium battery presents a fire, explosion, or severe burn risk. not recharge it, disassemble it, heat it above 100°C (212°F), incinerate it, or expose its cell contents to water.
  • Page 44 IBM PS/2 Model 95 XP 486 HMR 1060 System Board 7.12 1060 System Board Cover and Front Bezel (1005) Adapters and Adapter Guide (1035) Power Supply (1045) Hard Disk Drives (1030) (if necessary) Disconnect any cables necessary for removal. Note:...
  • Page 45 IBM PS/2 Model 95 XP 486 HMR 1065 Adapter Retainer and Ground Assembly 7.13 1065 Adapter Retainer and Ground Assembly Cover and Front Bezel (1005) Adapters and Adapter Guide (1035) Power Supply (1045) System Board (1060) Disconnect any cables necessary for removal.
  • Page 46 IBM PS/2 Model 95 XP 486 HMR 1070 Rear Bezel 7.14 1070 Rear Bezel Cover and Front Bezel (1005) Adapters (1035) Power Supply (1045) System Board (1060) Disconnect any cables necessary for removal. Note: Loosen and remove the expansion slot covers before removing the rear bezel.
  • Page 47 IBM PS/2 Model 95 XP 486 HMR 1075 Drive Support Structure 7.15 1075 Drive Support Structure Warning: When removing or replacing the drive support structure, be careful not to bend the ground spring. A damaged ground spring can result in intermittent noise problems.
  • Page 48 IBM PS/2 Model 95 XP 486 HMR 1080 Access Cover Fan 7.16 1080 Access Cover Fan The access cover fan is located on the inside of the system access cover. Cover and Front Bezel (1005) PICTURE 19 ¦ Copyright IBM Corp. 1990, 1991...
  • Page 49 IBM PS/2 Model 95 XP 486 HMR 1085 Access Cover Fan Cable 7.17 1085 Access Cover Fan Cable Cover and Front Bezel (1005) Power Supply (1045) Disconnect the fan cable from connector J28 on the system board. PICTURE 20 ¦ Copyright IBM Corp. 1990, 1991...
  • Page 50 IBM PS/2 Model 95 XP 486 HMR 1090 Option Hardware Trays 7.18 1090 Option Hardware Trays Cover and Front Bezel (1005) Drive Retainer and Bezels (1015) The option hardware trays contain cables and rails needed for installation of option devices.
  • Page 51 IBM PS/2 Model 95 XP 486 HMR 1095 Pedestal 7.19 1095 Pedestal Note: Pull out on the tabs just far enough to release the pedestal. PICTURE 22 ¦ Copyright IBM Corp. 1990, 1991 7.19 - 1...
  • Page 52 IBM PS/2 Model 95 XP 486 HMR Locations 8.0 Locations Subtopics 8.1 Front View 8.2 Rear View 8.3 Interior View 8.4 Internal Cables 8.5 System Board 8.6 Processor Board ¦ Copyright IBM Corp. 1990, 1991 8.0 - 1...

  • Page 53: Front View

    IBM PS/2 Model 95 XP 486 HMR Front View 8.1 Front View Power switch Power-good light Information panel Serial number Diskette drive (Bay A) Diskette drive in-use light Diskette-eject button Bay B Bay E Bay D Bay D1 Cover lock.

  • Page 54: Rear View

    IBM PS/2 Model 95 XP 486 HMR Rear View 8.2 Rear View Expansion slots Serial port Parallel port Pointing-device connector Keyboard connector Power-cord connector Serial number Voltage-select switch. PICTURE 24 ¦ Copyright IBM Corp. 1990, 1991 8.2 - 1...

  • Page 55: Interior View

    IBM PS/2 Model 95 XP 486 HMR Interior View 8.3 Interior View SCSI adapter Adapter retainer and ground assembly Processor board Access Cover Fan Cable System board Power supply Option device bays Hard disk drive Drive retainer Diskette drive. PICTURE 25 ¦...

  • Page 56: Internal Cables

    IBM PS/2 Model 95 XP 486 HMR Internal Cables 8.4 Internal Cables This diagram shows the arrangement of the cables that connect the various devices. Information-panel cable External-device cable connector System board Access Cover Fan Power supply Device power cables Signal cable Diskette-drive cable.

  • Page 57: System Board

    IBM PS/2 Model 95 XP 486 HMR System Board 8.5 System Board 32-bit expansion slots (video extensions J9, J11) Processor-board slot Serial port Parallel port J28 connector (access cover fan) Pointing-device connector Keyboard connector Memory-module connectors Power-supply connector J16 connector (power-on password)
  • Page 58 IBM PS/2 Model 95 XP 486 HMR Processor Board 8.6 Processor Board Use the following information to locate the connectors and jumpers on the various processor boards, and to identify the purpose of those connectors and jumpers. Note: The locations may vary slightly.
  • Page 59 IBM PS/2 Model 95 XP 486 HMR Grounds 9.0 Grounds Screws Expansion slot screws Chassis ground Primary ground Power-cord connector. PICTURE 29 Notes: ¦ Copyright IBM Corp. 1990, 1991 9.0 - 1...

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