Lenovo ThinkCentre A30 Hardware Maintenance Manual (HMM) for ThinkCentre 2296, - Page 114

Undetermined, problems

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Message/Symptom Some or all keys on the keyboard do not work FRU/Action 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems Check the power supply voltages (see "Power Supply Errors" on page 69). 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. Riser card e. Memory modules f. Extended video memory g. External Cache h. External Cache RAM i. Hard disk drive j. 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 the system board" on page 63). 108 Hardware Maintenance Manual

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Message/Symptom
FRU/Action
Some
or
all
keys
on
the
keyboard
do
not
work
1.
Keyboard
2.
Keyboard
Cable
3.
System
Board
Undetermined
problems
Check
the
power
supply
voltages
(see
“Power
Supply
Errors”
on
page
69).
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.
Riser
card
e.
Memory
modules
f.
Extended
video
memory
g.
External
Cache
h.
External
Cache
RAM
i.
Hard
disk
drive
j.
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
the
system
board”
on
page
63).
108
Hardware
Maintenance
Manual