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IBM PS2 Model 70 Hardware Maintenance Reference

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The IBM PS/2 Model 70 Hardware Maintenance Reference is IBM's service reference pamphlet for the PS/2 Model 70 (8570), part number 64F3993, form number S64F-3993-00, First Edition, dated 21 March 1990. The hosted copy is a 53-page PDF made in 2009 from IBM's BookManager edition, numbered by topic.

The 16 MHz and 20 MHz systems and the 25 MHz systems are treated separately: the math coprocessor, memory-module and system-board procedures differ, and the 25 MHz systems have a separate processor board (procedure 1052).

Contents

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From the table of contents:

  • 1.0 Product description: cover lock and power-on password; system-board features including CMOS RAM and CMOS RAM extension, ROM BIOS, VGA, serial and parallel ports, diskette-drive controller, keyboard and pointing-device connectors.
  • 2.0 Option compatibility: drives and diskettes, fixed disk drives, terminators.
  • 3.0 Operating requirements: power supply (3.1), POST, system memory with requirements, limitations and errors.
  • 4.0 Specifications: 360 × 410 × 140 mm, 9-11 kg, heat output 220 W, input 90-137 V or 180-265 V.
  • 5.0 Special tools: a volt-ohm meter similar to the Triplett Model 310; snap tool 72X8547, replaced in some 25 MHz systems by modified tool 57F2859, which also separates the processor board from the system board.
  • 6.0 Removals and replacements: 1005 Cover, 1007 Cover Lock, 1010 Battery and Speaker Assembly, 1020 Adapters, 1030 Diskette Drives, Fixed Disk Drives and Bus Adapter, 1035 Support Structure, 1040 Power Supply, 1045 Math Coprocessor (16/20 MHz and 25 MHz versions), 1050 Memory-Module Kits (16/20 MHz and 25 MHz versions), 1052 Processor Board (25 MHz), 1055 System Board.
  • 7.0 Locations: front, rear and interior views; system boards, full size and reduced size (16/20 MHz) and 25 MHz.
  • 8.0 Safety grounds.

What this manual does not contain

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There is no parts list, symptom-to-FRU index, schematic or component values.

What it settles

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The supply switches automatically between 100-125 V and 200-240 V. Its outputs are +5, +12 and −12 V, with minimum under-voltage sense levels of +4.5, +10.8 and −10.2 V. After the system has been off for 10 seconds or more, power-on produces Power Good, which lights the green light on the front; "If the green light is not on, the power supply is not functioning properly" (3.1).

Pages that cite this document

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Download: IBM PS2 Model 70 HMR.pdf

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