Beep Symptoms - Lenovo ThinkCentre A52 Hardware Maintenance Manual

Beep symptoms

Beep symptoms are tones or a series of tones separated by pauses (intervals
without sound) See the following examples.
When a recoverable error occurs during POST, BIOS displays an error code on the
video display describing the problem. If a video failure is detected, BIOS also
issues a beep code (one long tone followed by two short tones) during POST.
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.
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Hardware Maintenance Manual
1-2-X
4
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
1-3-3-1 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
v One beep
v A pause (or break)
v Two beeps
v A pause (or break)
v Any number of breaks
Four continuous 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