IBM 6643 - Manual (Page 43)

Chapter 5. Symptom-to-FRU Index
Beep symptoms . . . . . . . . . . . . . 35
Hard disk drive boot error . . . . . . . . . 36
IBM Enhanced Diagnostic error codes . . . . . 37
POST error codes . . . . . . . . . . . . 54
Undetermined problems . . . . . . . . . . 56
The Symptom-to-FRU index lists error symptoms and possible causes. The most
likely cause is listed first. Always begin with Chapter 2, “General information,” on
page 3. This index can also be used to help you decide which FRUs to have
available when servicing a computer. If you are unable to correct the problem
using this index, go to “Undetermined problems” on page 56.
Important:
1. Types 2179 and 6643 computers come up quiet (no beep and no memory count and
checkpoint code display) when no errors are detected.
2. Use Beep codes and the IBM Enhanced Diagnostics to diagnose and fix problems.
3. The processor is a separate FRU from the system board; the processor is not included
with the system board FRU.
Beep symptoms
Beep symptoms are short tones or a series of short tones separated by pauses
(intervals without sound). See the following examples.
Beeps Description
1-2-X
v One beep
v A pause (or break)
v Two beeps
v A pause (or break)
v Any number of breaks
4 Four continuous beeps
Use the following table to diagnose beep symptoms.
Beep Symptom FRU/Action
1
Refresh failure
1. Run IBM Enhanced Diagnostics
2. Memory module
3. System board
3
Base 64KB memory failure
1. Memory module
2. System board
4
Timer not operational
1. Memory module
2. System board
5
Processor error
1. Processor
2. System Board
6
8042-Gate A20 failure
1. System Board
2. Keyboard
© Copyright IBM Corp. 2004 35