IBM PS2 Model 55 SX Hardware Maintenance Service
The IBM PS/2 Model 55 SX Hardware Maintenance Service is IBM's service pamphlet for the PS/2 Model 55 SX (8555), part number 91F8637, form number S15F-2195-02, copyright 1991. The hosted copy is a 35-page PDF made in 2009 from IBM's BookManager edition, numbered by topic. Its front page describes it as containing "procedures for isolating problems to a FRU, a Symptom-to-FRU Index, and a parts listing", to be used with the PS/2 Hardware Maintenance Reference (15F2190, S15F-2190-00) and Hardware Maintenance Service (15F2200, S15F-2200-00) manuals; safety information is in the Hardware Maintenance Service General Information manual. The parts list also covers the Model 55 LS front cover.
Contents
[edit | edit source]- 1.0 General checkout.
- 2.0 Installed devices list: automatic configuration, device types, SCSI and non-SCSI devices.
- 3.0 Power-on password; 4.0 Undetermined problem.
- 5.0 Power supply voltages and fan.
- 6.0 Enable and disable settings (SCSI presence error reporting).
- 7.0 Display self-test; 8.0 Display Adapter 8514/A; 9.0 Keyboard; 10.0 Printer; 11.0 Memory.
- 12.0 Symptom-to-FRU index; 13.0 How to use this parts catalog; 14.0 System overview; 15.0 Parts, including the power supply and fan assembly, FRU 27F4166.
What this manual does not contain
[edit | edit source]There are no removal procedures, schematics or component values. The supply and fan are one FRU.
What it settles
[edit | edit source]IBM's supply check (5.0): power off, remove the supply connectors P7 and P14 from the system board, power on and measure between the pins given. IBM lists each check as a pin pair and a range, without naming the outputs:
| Minimum | Maximum | − lead | + lead |
|---|---|---|---|
| +4.8 V | +5.2 V | P7-5 | P7-10 |
| +4.5 V | +5.4 V | P7-9 | P7-5 |
| +11.5 V | +12.6 V | P7-5 | P7-3 |
| +10.8 V | +12.9 V | P7-4 | P7-8 |
| +4.8 V | +5.2 V | P14-1 | P14-3 |
| +4.8 V | +5.2 V | P14-1 | P14-4 |
| +4.8 V | +5.2 V | P14-2 | P14-5 |
If the voltages are wrong, check the power cord for continuity; if the cord is good, replace the power supply. If the fan is not running, replace the power supply.
Pages that cite this document
[edit | edit source]- IBM PS2 Model 55 Technical Reference (February 1989), IBM PS2 Model 55 Technical Reference (October 1990), IBM PS2 Model 55SX HITR Supplement and IBM PS2 SCSI-A Technical Reference list it as related.
Download: IBM PS2 Model 55 SX HMS.pdf