Undetermined Problem - IBM PS/2 N51 SX Hardware Maintenance Service

3.0 Undetermined Problem

You are here because the diagnostics tests did not identify the failing
FRU.
Check the power supply in use (see "Power Supply" in topic 5.0).
power supply is operating correctly, return here and continue with the
following procedure.
1. Power-off the system.
2. Remove or disconnect one of the following devices or adapter: ( Do not
isolate FRUs that are known to be good.)
a. Non-IBM devices
b. Modem, printer, mouse, or other external device
c. Memory module kit
d. Hard disk drive (fixed disk drive)
e. Communications cartridge
f. Any adapter and device.
3. Power-on the system and start the system program.
4. Press Ctrl+A to run the system checkout.
If diagnostics cannot be loaded from the hard disk, try and load them
from the Reference Diskette.
still attached to the system.
5. If the symptom remains, repeat steps 1 through 3 until you find the
failing FRU or until all FRUs have been removed.
6. If all of the FRUs listed have been removed and the problem remains,
replace the system board.
IBM PS/2 Model N51 SX HMS
Undetermined Problem
Do not configure the system.
Test only those adapters and devices
¦ Copyright IBM Corp. 1991
3.0 - 1
If the