Lenovo M55p - ThinkCentre - 8808 Hardware Maintenance Manual page 77

If an external ROM module does not properly checksum to zero. An external ROM can also issue audible
tones, usually consisting of one long tone followed by a series of short tones.
Use the following table to diagnose beep symptoms.
Beep Symptom
1-1-3 CMOS read-write error
1-2-2-3 ROM BIOS check error
1-2-1 Programmable Interval Timer failed
1-2-2 DMA Initialization failed
1-2-3 DMA page register write/read failed
1-2-4 RAM refresh verification failed
4-4-4-4 1st 64K RAM test failed
1-3-2 1st 64K RAM parity test failed
2-2-3-1 Interrupt vector loading test failed
2-1-1 Secondary DMA register failed
2-1-2 Primary DMA register failed
2-1-3 Primary interrupt mask register failed
2-1-4 Secondary interrupt mask register failed
2-2-1 Interrupt vector loading failed
1-3-1-3 Keyboard controller failed
2-2-3 CMOS power failure and checksum checks failed
2-2-4 CMOS configuration info validation failed
2-3-1 Screen initialization failed
2-3-2 Screen memory failed
2-3-3 Screen retrace failed
1-2 Search for video ROM failed
All other beep code sequences
Continuous beep
Repeating short beeps
FRU/Action
1. Run Setup
2. System Board
System board
System board
System board
System board
1. Memory module
2. System Board
1. Memory module
2. System Board
1. Memory module
2. Processor
3. System Board
System board
System board
System board
System board
System board
System board
1. System Board
2. Keyboard
1. Battery
2. System Board
1. Battery
2. System Board
1. Jumper on J28
2. System Board
System board
System board
System board
System board
System Board
1. Keyboard stuck key
2. Keyboard Cable
3. System Board
Chapter 7
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Symptom-to-FRU Index
71