IBM 21Y Maintenance Manual page 139

Beep/Symptom
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)
1-3-1
(1st 64K RAM
test failed)
1-3-2
(1st 64K RAM
parity test failed)
1-4-3
(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)
2-2-2
(Keyboard
controller failed)
130
Netfinity 3500-M20 – Type 8657 Models 21Y, 22Y, 31Y, 32Y,
1. System Board
1. System Board
1. System Board
1. DIMM
2. System Board
1. DIMM
2. System Board
1. DIMM
2. Processor
3. System Board
1. System Board
1. System Board
1. System Board
1. System Board
1. System Board
1. System Board
1. System Board
2. Keyboard
FRU/Action