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Message/Symptom
Serial or parallel port device failure (adapter port)
Some or all keys on the keyboard do not work
Undetermined problems
Check the power supply voltages (see "20-pin power supply connection" on page 34).
If the voltages are correct, return here and continue with the following steps.
1.
Power-off the computer.
2.
Remove or disconnect the following components (if installed) one at a time.
a.
Non-IBM devices
b. External devices (modem, printer, or mouse)
c.
Any adapters
d. Memory modules
Before removing or replacing memory modules, see "System board memory"
on page 29.
e.
Extended video memory
f.
External Cache
g. External Cache RAM
h. Hard disk drive
i.
Diskette drive
3.
Power-on the computer to re-test the system.
4.
Repeat steps 1 through 3 until you find the failing device or adapter.
If all devices and adapters have been removed, and the problem continues, replace the
system board (see "Replacing a system board" on page 15).
FRU/Action
1.
External Device Self-Test OK?
2.
External Device
3.
Cable
4.
Alternate Adapter
5.
System Board
1.
Keyboard
2.
Keyboard Cable
3.
System Board
81
Symptom-to-FRU index
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