IBM 8478 Hardware Maintenance Manual - Page 111
Symptom, FRU/Action, System, Board, Battery, Jumper, board
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Page 111 highlights
Beep/ Symptom FRU/Action 2-2-2 (Keyboard controller failed) 1. System Board 2. Keyboard 2-2-3 (CMOS 1. Battery power failure and 2. System board checksum checks failed) 2-2-4 (CMOS 1. Battery configuration info 2. System board validation failed) 2-3-1 (Screen initialization failed) 1. Jumper on J28 2. System Board 2-3-2 (Screen memory failed) 1. System board 2-3-3 (Screen retrace failed) 1. System board 2-3-4 (Search for video ROM failed) 1. System board 2-4-1 (Video 1. System board failed, screen believed operable) 3-1-1 (Timer 1. System Board tick interrupt failed) 3-1-2 (Interval 1. System Board timer channel 2 failed) 3-1-3 (RAM test failed above address OFFFFH) 1. DIMM 2. Memory card 3. System board 3-1-4 1. Battery (Time-of-Day clock failed) 2. System Board 3-2-1 (Serial 1. System board port failed) Chapter 7. Symptom-to-FRU index 101
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