IBM Personal System 2 Hardware Maintenance Manual (S52G-9971-02, October 1994)
The IBM Personal System/2 Hardware Maintenance Manual, form number S52G-9971-02, part number 83G8990, is the Third Edition (October 1994) of IBM's single-volume service manual for "IBM Personal System/2 desktop and floor-standing computers". The PDF has 484 pages; the printed page numbers run to 468. It obsoletes the previous PS/2 HMM (71G3716, S52G-9971) and eleven HMM and OBI supplements, which are listed on p. iv.
Unlike the earlier model pamphlets, it carries its own safety information (pp. 365-369), so it can be used without the general HMR and HMS binders. Laptop, notebook and portable machines are in the separate IBM Mobile Systems HMM, and PS/ValuePoint machines in the PS/ValuePoint HMM (related publications, p. iv).
Contents
[edit | edit source]| Part | Page |
|---|---|
| FRU replacement strategy and hard disk drive replacement strategy | 1 |
| General Checkout and Symptom-to-FRU Index (AT Bus): Models 25, 25 SX, 25-286, 30, 30-286, 33, 35, 40 and 55 | 3, 12 |
| General Checkout and Symptom-to-FRU Index (Micro Channel), with the system error log (p. 25) and IML/IPL errors (p. 55) | 19, 26 |
| General Checkout and Symptom-to-FRU Index (QAPlus/PRO) | 59, 61 |
| Network service procedures (Token-Ring, Ethernet, ServerGuard, wireless LAN) | 74 |
| Related service information, including power supply voltage checks by model (pp. 138-149), real-time clock problems (p. 150) and undetermined problems (p. 183) | 107 |
| System board locations, Model 25 to PC Server | 185 |
| Parts catalogue by model, common parts, options and adapters matrix | 222, 295, 311 |
| Hardware Maintenance Reference: safety, drive and diskette compatibility, security and passwords, system features, POST, diagnostics, memory, SCSI, power supplies (p. 422), system partition, ASCII terminals | 363 |
| PS/2 system specifications | 435 |
Figures a repairer can use
[edit | edit source]- Supply voltage checks (pp. 138-149) with connector pinouts for each model group. The AT-bus machines (25, 30, 33, 35, 40) have a -5 V output; the Model 35/40/56/57/76/77 supply is started for testing by shorting P2 pin 4 to pin 6 (p. 140). The Models 60, 65 and 80 table allows +3.7 to +6.2 V on the +5 V pins and +9.0 to +15.0 V on +12 V (p. 142). The Model 90 table gives +4.8 to +5.25 V and +11.5 to +12.6 V (p. 142).
- Numeric error codes with FRU order, AT bus (p. 15) and Micro Channel (p. 33).
- FRU numbers for each model's supply, system board and drives (parts catalogue).
The Models 50 and 70 table on p. 141 prints "+15.0 / +15.0" and "+6.2 / +6.2" as minimum and maximum; these are misprints and cannot be used as limits.
What this manual does not contain
[edit | edit source]IBM's method is FRU exchange: the manual names part numbers, not component values. There is no schematic and no board-level parts list, and each supply is a single FRU. The model pamphlets (HMR and HMS) give more removal detail for the machines they cover.
Pages that cite this document
[edit | edit source]- IBM PS/2 Model 60: supply service limits and parts
- IBM PS/2 Model 30, IBM PS/2 Model 30 Maintenance Guide, IBM PS/2 Model 30 Troubleshooting Guide: AT-bus checkout, Symptom-to-FRU Index and FRUs
- IBM PS/2 Model 50, IBM PS/2 Model 50 Maintenance Guide, IBM PS/2 Model 50 Capacitor Replacement Guide: Micro Channel error codes, FRUs and the p. 141 misprint
- IBM PS/2 Model 25 and its guides
Download: IBM PS2 HMM S52G-9971 Oct 1994.pdf