IBM 6648 Personal Computer User Manual


 
Beep Symptom FRU/Action
3-1-XDMA register failed
1. System Board
3-2-4Keyboard controller failed
1. System Board
2. Keyboard
3-3-4Screen initialization failed
1. Video Adapter (if installed)
2. System Board
Display
3-4-1Screen retrace test detected an error
1. Video Adapter (if installed)
2. System Board
3. Display
3-4-2POST is searching for video ROM
1. Video Adapter (if installed)
2. System Board
4
1. Video Adapter (if installed)
2. System Board
All other beep code sequences
1. System Board
One long and one short beep during POST.Base
640 KB memory error or shadow RAM error
1. Memory Module
2. System Board
One long beep and two or three short beeps
during POST.(Video error)
1. Video Adapter (if installed)
2. System Board
Three short beeps during POST
1. See System board memory on page 135
2. System Board
Continuous beep
1. System Board
Repeating short beeps
1. Keyboard stuck key?
2. Keyboard Cable
3. System Board
No-beep symptoms
Note: Types 6058/6059/6269/6578/6579 computers default to come up quiet
(no beep and no memory count and checkpoint code display) when no
errors are detected by POST.
To enable beep and memory count and checkpoint code display when a
successful POST occurs, do the following:
1. Select Start Options in the Configuration/Setup Utility program
(see Setup Utility program on page 122).
152 Hardware Maintenance Manual: IBM NetVista Computer Types 6058, 6059, 6269, 6568, 6569, 6578, 6579, 6648,
6649