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IBM PS/2 N51 SX HMR Manual
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IBM PS/2 N51 SX HMR Manual

IBM PS/2 N51 SX HMR Manual

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IBM PS/2 Model N51 SX HMR
FRONT
PICTURE 1
October 22, 1991
Part Number 04G5111
Form Number S04G-5111-00
¦ Copyright IBM Corp. 1991
FRONT - 1

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  • Page 1 IBM PS/2 Model N51 SX HMR FRONT PICTURE 1 October 22, 1991 Part Number 04G5111 Form Number S04G-5111-00 ¦ Copyright IBM Corp. 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: Notices

    Notices FRONT_1 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

    IBM PS/2 Model N51 SX HMR Trademarks and Service Marks FRONT_1.1 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 PS/2 Micro Channel.

  • Page 5: Table Of Contents

    IBM PS/2 Model N51 SX HMR Table of Contents CONTENTS Table of Contents EDITION Edition Notice FRONT_1 Notices FRONT_1.1 Trademarks and Service Marks CONTENTS Table of Contents Product Description Security 1.1.1 Power-On Password and Keyboard Password System Board Features 1.2.1 Microprocessor 1.2.2...

  • Page 6: Product Description

    IBM PS/2 Model N51 SX HMR Product Description 1.0 Product Description The IBM (*) Personal System/2 (*) Model N51 SX (hereafter called Model N51) is a notebook-size computer that uses the IBM Micro Channel (*) architecture. With an internal rechargeable battery, the Model N51 operates outside an office environment as well as where external power source is available.
  • Page 7 IBM PS/2 Model N51 SX HMR Security 1.1 Security Subtopics 1.1.1 Power-On Password and Keyboard Password ¦ Copyright IBM Corp. 1991 1.1 - 1...
  • Page 8 IBM PS/2 Model N51 SX HMR Power-On Password and Keyboard Password 1.1.1 Power-On Password and Keyboard Password System access can be denied by using a power-on password or keyboard password. To service a system with an active and unknown password, power-off the system and do the following.

  • Page 9: Microprocessor

    IBM PS/2 Model N51 SX HMR System Board Features 1.2 System Board Features The major features of the system board are: 80386SX Microprocessor CMOS RAM and CMOS RAM extension ROM BIOS Diskette-drive controller VGA with LCD controller Serial port Parallel port...
  • Page 10 IBM PS/2 Model N51 SX HMR Microprocessor 1.2.1 Microprocessor The microprocessor interprets and carries out instructions. The 80386SX microprocessor is a 32-bit processor with a 16-bit external data bus and a 24-bit external address bus. The microprocessor operates in two modes: real-address mode and virtual-address (protected) mode.
  • Page 11 IBM PS/2 Model N51 SX HMR CMOS RAM and CMOS RAM Extension 1.2.2 CMOS RAM and CMOS RAM Extension The CMOS RAM provides 64 bytes of storage. The real-time clock uses the first 14 bytes of this storage to track the date, time, and battery level.
  • Page 12 IBM PS/2 Model N51 SX HMR ROM BIOS/POST 1.2.3 ROM BIOS/POST Read Only Memory - Basic Input/Output System (ROM BIOS) contains the instructions and routines that control the keyboard, diskette drive, hard disk drive, displays and other major I/O devices in the system.
  • Page 13 IBM PS/2 Model N51 SX HMR System Partition 1.2.4 System Partition The Model N51 has a protected partition, called the system partition, on the hard disk that contains system setup and utility programs, customer and advanced diagnostics, and system-configuration data set.
  • Page 14 IBM PS/2 Model N51 SX HMR Errors during POST 1.2.5 Errors during POST If the POST detects a problem during access on the system partition, an I99800XX or I9990303 error code is displayed. If this happens, do the following: Start the system with the customer's backup copy of the Reference Diskette installed.

  • Page 15: Diskette-Drive Controller

    The controller connects to the diskette drive through two interface connectors on the system board using a flexible cable. Both signals and voltages, are supplied through this cable. These signals and voltages can only operate one IBM 3.5-inch diskette drive. ¦ Copyright IBM Corp. 1991 1.2.6 - 1...

  • Page 16: Vga With Lcd Controller

    IBM PS/2 Model N51 SX HMR VGA with LCD Controller 1.2.7 VGA with LCD Controller The VGA with LCD controller is on the system board and supports color and monochrome analog direct-drive displays in a variety of alphanumeric (A/N) text and all-points-addressable (APA) graphics modes.

  • Page 17: Serial Port

    IBM PS/2 Model N51 SX HMR Serial Port 1.2.8 Serial Port The serial port is fully programmable and is capable of asynchronous communications at a maximum speed of 19.2 kb/s. The 9-pin D-shell connector provides the signals to drive a standard EIA-232D device.

  • Page 18: Parallel Port

    IBM PS/2 Model N51 SX HMR Parallel Port 1.2.9 Parallel Port The parallel port allows the attachment of devices that accept 8 bits of parallel data at standard transistor-transistor logic (TTL) levels. port has a 25-pin, D-shell connector and is designed primarily for printers.

  • Page 19: External Input Device Port

    IBM PS/2 Model N51 SX HMR External Input Device Port 1.2.10 External Input Device Port The external input device port is located at the rear of the system and accepts a mouse or 17-key numeric keypad. The Model N51 has only one input-device connector.

  • Page 20: Optional Communication-Interface Connector

    IBM PS/2 Model N51 SX HMR Optional Communication-Interface Connector 1.2.11 Optional Communication-Interface Connector This option connector can accept either a secondary serial adapter or an internal data/fax modem. The serial adapter complies with EIA-232D standard and provides alternative input/output capabilities that have the same function as the primary serial port on the rear of the system.

  • Page 21: Suspend And Resume Functions

    IBM PS/2 Model N51 SX HMR Suspend and Resume Functions 1.2.12 Suspend and Resume Functions The suspend and resume functions are unique methods to minimize the use of power from the battery. When the computer enters suspend mode, all tasks are suspended and their present states are stored in memory to save power.

  • Page 22: System-Expansion Port

    IBM PS/2 Model N51 SX HMR System-Expansion Port 1.2.13 System-Expansion Port This port has a 120-pin connector that can accept a communications cartridge to support various communication capabilities provided with a 16-bit Micro Channel adapter installed in the cartridge. ¦ Copyright IBM Corp. 1991...

  • Page 23: Option Compatibility

    IBM Personal System/2. However, a half-size communication adapter in the communications cartridge, which is designed for IBM Personal System/2 computers that use Micro Channel architecture, can be attached to the system expansion port. The communication adapters that the Model N51 supports are:...

  • Page 24: Hard Disk Drive

    IBM PS/2 Model N51 SX HMR Hard Disk Drive 2.1 Hard Disk Drive The Model N51 has one 2.5-inch 40MB hard disk drive directly attached to Micro Channel bus. The hard disk drive automatically positions the read/write heads in nondata areas when the system is powered off or the system enters suspend mode.
  • Page 25 IBM PS/2 Model N51 SX HMR Replacing the Hard Disk Drive 2.1.1 Replacing the Hard Disk Drive A replacement hard disk drive is shipped without any preloaded system information. Start the system with the customer's backup copy of the Reference Diskette, select 2. Backup/Restore system programs from the Main Menu, and run the 3.

  • Page 26: Diskette Drive And Diskette

    IBM PS/2 Model N51 SX HMR Diskette Drive and Diskette 2.2 Diskette Drive and Diskette The Model N51 uses a 1.44MB formatted diskette drive. (It has 1.44 on the eject button). Both 1.0MB (formatted 720KB) and 2.0MB (formatted 1.44MB) capacity diskettes can be used in this drive.

  • Page 27: System Memory Requirements

    IBM PS/2 Model N51 SX HMR System Memory Requirements 3.0 System Memory Requirements The Model N51 has a minimum of 2MB of memory installed on the system board at the time of shipment. One additional memory-module kit, 2MB, 4MB, or 8MB, can be installed into the memory module connector on the system board.

  • Page 28: Specifications

    IBM PS/2 Model N51 SX HMR Specifications 4.0 Specifications Subtopics 4.1 System 4.2 AC Adapter ¦ Copyright IBM Corp. 1991 4.0 - 1...
  • Page 29 IBM PS/2 Model N51 SX HMR System 4.1 System Size Depth: 210.0 mm (8.3 in.) Height: 53.5 mm (2.1 in.) Width: 297.0 mm (11.7 in.). Weight Approximately 2.8 kg (6.2 lb.) with a battery pack. Environment Air Temperature: System On: 5.0°...
  • Page 30 IBM PS/2 Model N51 SX HMR AC Adapter 4.2 AC Adapter Input Voltage Low Range Minimum: 90 V ac Maximum: 137 V ac. High Range Minimum: 180 V ac Maximum: 264 V ac. Frequency Range Minimum: 47 Hz Maximum: 63 Hz.

  • Page 31: Special Tools

    A meter similar to the Triplet Model 310 (1). Screwdriver Kit Use small screwdrivers (IBM part 95F3598) when removing and replacing FRUs. Wrap Plug The Tri-Connector wrap plug (IBM part 72X8546) is used during advanced diagnostic tests of: Parallel Ports Serial Ports. PICTURE 3 (1) Manufactured by Triplett Corporation, Bluffton, Ohio 45817, U.S.A.

  • Page 32: Removals And Replacements

    IBM PS/2 Model N51 SX HMR Removals and Replacements 6.0 Removals and Replacements This section contains information on removals and replacements, and locations. The arrows in the "Removals and Replacements" section show the direction of movement to remove a field replaceable unit (FRU), to turn a screw to release the FRU.
  • Page 33 IBM PS/2 Model N51 SX HMR 1010 Bottom Cover 6.1 1010 Bottom Cover CAUTION: Before removing any FRU, power-off the system, unplug all power cords from electrical outlets, remove the battery pack, then disconnect any interconnecting cables. Note: Before removing the bottom cover, invert the system and place it on its top on a flat surface.
  • Page 34 IBM PS/2 Model N51 SX HMR 1020 Optional Communication Adapter 6.2 1020 Optional Communication Adapter Notes: The optional communication adapter can be either a serial adapter or an internal data/fax modem. Disconnect any communication cable from the adapter. PICTURE 6 PICTURE 7 ¦...
  • Page 35 IBM PS/2 Model N51 SX HMR 1030 Memory Module Kit 6.3 1030 Memory Module Kit PICTURE 8 PICTURE 9 Note: When installing a memory module kit, carefully insert the kit into the connector, then press it down firmly until both edges snap into place.
  • Page 36 IBM PS/2 Model N51 SX HMR 1040 Voltage Converter 6.4 1040 Voltage Converter Bottom Cover (1010). Notes: The voltage converter consists of three printed-circuit boards that are shown as shaded in the illustration. Remove these three boards as an assembly when you replace the voltage converter.
  • Page 37 IBM PS/2 Model N51 SX HMR 1050 Hard Disk Drive 6.5 1050 Hard Disk Drive Warning: The hard disk drive has sensitive parts. Improper handling of it can cause damage to, and permanent loss of data on, the hard disk.
  • Page 38 IBM PS/2 Model N51 SX HMR 1060 Diskette Drive 6.6 1060 Diskette Drive Bottom Cover (1010) Voltage Converter (1040). Warning: To avoid damaging to the flexible cables, carefully unplug the four connectors 1 from the system board. PICTURE 13 ¦ Copyright IBM Corp. 1991...
  • Page 39 IBM PS/2 Model N51 SX HMR 1070 System Board and Keyboard Control Card 6.7 1070 System Board and Keyboard Control Card Optional Communication Adapter, if installed (1020) Bottom Cover (1010) Memory Module Kit, if installed (1030) Voltage Converter (1040) Hard Disk Drive (1050).
  • Page 40 IBM PS/2 Model N51 SX HMR 1080 Keyboard Assembly 6.8 1080 Keyboard Assembly Optional Communication Adapter, if installed (1020) Bottom Cover (1010) Memory Module Kit, if installed (1030) Voltage Converter (1040) Hard Disk Drive (1050) Diskette Drive (1060) System Board and Keyboard Control Card (1070).
  • Page 41 IBM PS/2 Model N51 SX HMR 1090 I/O Panel Assembly 6.9 1090 I/O Panel Assembly Optional Communication Adapter, if installed (1020) Bottom Cover (1010) Memory Module Kit, if installed (1030) Voltage Converter (1040) Hard Disk Drive (1050) Diskette Drive (1060) System Board and Keyboard Control Card (1070).
  • Page 42 When replacing the backup battery, use only Part No. 07G1225. Use of another battery could result in ignition or explosion of the battery. Replacement batteries can be ordered from IBM or IBM Authorized Dealers. Bottom Cover (1010). PICTURE 19 Note: When you replace the backup battery, align the wires 3 with the edge 4 of the voltage converter.
  • Page 43 IBM PS/2 Model N51 SX HMR 1110 Standby Battery 6.11 1110 Standby Battery CAUTION: The standby battery contains a small amount of nickel and cadmium. Do not disassemble it, recharge it, throw it into fire or water, or short-circuit Dispose of the battery as required by local ordinances or regulations.
  • Page 44 IBM PS/2 Model N51 SX HMR 1120 LCD Bezel 6.12 1120 LCD Bezel Removal Fully open the lid of the computer. Press down on the hinge cover and slide it forward to remove when the two tabs 1 clear the bezel 2.
  • Page 45 IBM PS/2 Model N51 SX HMR 1130 LCD Inverter 6.13 1130 LCD Inverter LCD Bezel (1120). PICTURE 24 ¦ Copyright IBM Corp. 1991 6.13 - 1...
  • Page 46 IBM PS/2 Model N51 SX HMR 1140 LCD Panel 6.14 1140 LCD Panel LCD Bezel (1120) LCD Inverter (1130). PICTURE 25 ¦ Copyright IBM Corp. 1991 6.14 - 1...

  • Page 47: Locations

    IBM PS/2 Model N51 SX HMR Locations 7.0 Locations Subtopics 7.1 Front View 7.2 Rear View 7.3 Interior View 7.4 System Status Indicators 7.5 System Board ¦ Copyright IBM Corp. 1991 7.0 - 1...
  • Page 48 IBM PS/2 Model N51 SX HMR Front View 7.1 Front View Release Lever Contrast Control Brightness Control LCD Inverter Power-On Light (green) System Power Switch Diskette-Eject Button Diskette Drive Battery Pack Keyboard Bottom Cover Reverse Video Switch Speaker Volume LCD Panel PICTURE 26 ¦...
  • Page 49 IBM PS/2 Model N51 SX HMR Rear View 7.2 Rear View External Power Jack Communication Interface Connector Machine Identification Label System Expansion Port I/O Panel Power Control Switch for Communications Cartridge External Display Port Parallel Port Serial Port External Input Device Port PICTURE 27 ¦...
  • Page 50 IBM PS/2 Model N51 SX HMR Interior View 7.3 Interior View Diskette Drive I/O Panel Assembly Voltage Converter System Board Speaker Hard Disk Drive Backup Battery Optional Memory Module Kit Battery Presence Switch Standby Battery Keyboard Assembly PICTURE 28 ¦ Copyright IBM Corp. 1991...
  • Page 51 IBM PS/2 Model N51 SX HMR System Status Indicators 7.4 System Status Indicators PICTURE 29 ¦ Copyright IBM Corp. 1991 7.4 - 1...

  • Page 52: System Board

    IBM PS/2 Model N51 SX HMR System Board 7.5 System Board PICTURE 30 +------------------------------+ ¦ Key ¦ Connector ¦ +----------+-------------------¦ ¦ 1, 5, 6 ¦ LCD Interface ¦ +----------+-------------------¦ ¦ 2 ¦ System-Expansion ¦ ¦ ¦ Port (120-pin) ¦ +----------+-------------------¦...
  • Page 53 IBM PS/2 Model N51 SX HMR Keyboard Control Card 7.6 Keyboard Control Card PICTURE 32 +-----------------------------+ ¦ Key ¦ Connector ¦ +---------+-------------------¦ ¦ 1 ¦ Numeric-Key ¦ ¦ ¦ Control Switch ¦ +---------+-------------------¦ ¦ 2 ¦ System Board ¦ ¦...

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