IBM 21Y Manuel D’Utilisation

 Symptom-to-FRU index

2-2-3
(CMOS power 
failure and 
checksum 
checks failed)

1. Battery

2. System board

2-2-4
(CMOS 
configuration 
info validation 
failed)

1. Battery

2. System board

2-3-1
(Screen 
initialization 
failed)

1. Jumper on J8

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 failed, 
screen believed 
operable)

1. System board

3-1-1
(Timer tick 
interrupt failed)

1. System Board

3-1-2 
(Interval timer 
channel 2 failed)

1. System Board

3-1-3
(RAM test failed 
above address 
OFFFFH)

1. DIMM

2. Memory card

3. System board

3-1-4
(Time-of-Day 
clock failed)

1. Battery

2. System Board

3-2-1
(Serial port 
failed)

1. System board

3-2-2
(Parallel port 
failed)

1. System board