IBM PS2 Model P70 386 Hardware Maintenance Reference
The IBM PS/2 P70 386 Hardware Maintenance Reference is IBM's 56-page service reference pamphlet for the PS/2 Model P70 386 (8573), the luggable Micro Channel machine with a gas-plasma display. Part number 64F3994, form number S64F-3994-00, First Edition (March 1990).
What it contains
The Hardware Maintenance Reference pamphlets all follow the same structure:
- 1.0 Product Description — security and the cover lock, the power-on password, and the system-board features (microprocessor, CMOS RAM, ROM BIOS, video, serial and parallel ports, diskette controller, keyboard and pointing-device connectors).
- 2.0 Option Compatibility — drive and diskette compatibility, fixed disk drives and terminators, and any adapters that are incompatible with this model.
- 3.0 Operating Requirements — the power supply and its minimum under-voltage sense levels, the power-on self-test, and the memory subsystem with its configuration rules and error handling.
- 4.0 Specifications — size, weight, electrical input and heat output.
- 5.0 Special Tools — the model's own service tools.
- 6.0 Removals and Replacements — the numbered 10xx procedures, in the order IBM intends them to be done.
- 7.0 Locations — front, rear, interior and system-board views with connector and jumper callouts.
Model-specific removals: 1005 Cover, 1010 Battery and Speaker Assembly, 1015 Option-Connector Assembly, 1020 Adapters, 1025 Fixed Disk Drive, 1030 Power Supply, 1035 Math Coprocessor, 1040 Memory-Module Kits, 1045 System Board and Plasma-Display Adapter, 1050 Plasma-Display Assembly and 1055 Diskette Drive. Section 7 gives front, rear, interior and system-board location views.
What it does not contain
Module level only. IBM serviced these machines by field-replaceable-unit exchange, and this pamphlet reflects that: it names FRU part numbers, not component values. There is no capacitor list, no resistor list, no semiconductor list and no schematic anywhere in it. The power supply, the planar and each drive are single line items in the parts catalogue. This is why no IBM machine checked in this wiki's verification drive has a published component-level capacitor list — it is not that the manuals were lost, it is that IBM never wrote one.
It is also not a standalone book. IBM issued it as a pamphlet to be filed in a binder alongside the general-purpose IBM Personal System/2 Hardware Maintenance Reference (part number 15F2190, form number S15F-2190-00) and Hardware Maintenance Service (part number 15F2200, form number S15F-2200-00), which carry the safety information, the general checkout procedure and the option and adapter sections. Those two general volumes are not hosted here.
The plasma display assembly is a single FRU. There is no panel drive circuit description, no inverter schematic and no component data for it.
Download it here: IBM PS2 P70 386 HMR.pdf