ThinkPad Computer Hardware Maintenance Manual
This manual is intended for trained service personnel who maintain IBM ThinkPad R40 laptops. It contains safety notices, FRU replacement strategies, error‑code troubleshooting, and detailed parts information.
The document includes a product overview, specifications, power‑management guidance, diagnostic test procedures, and a comprehensive parts list with part numbers for regional power cords and accessories.
| Processor options | Mobile Intel® Pentium®4 M 1.8‑2.4 GHz, L2 512 KB cache |
|---|---|
| Standard memory | 128 MB DDR SDRAM SO‑DIMM (PC2100) |
| Maximum memory | 1024 MB DDR SDRAM |
| Graphic memory | 16 MB DDR SDRAM on system board |
| Bus architecture | 400 MHz PSB |
Make sure all screws, springs, and other small parts are in place and not loose; verify this by shaking the computer.
Start diagnosis with the first displayed error code; additional codes may be caused by the same issue.
Run a low‑level format on the drive before deciding to replace it.