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
57).
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.
External
devices
(modem,
printer,
or
mouse)
b.
Any
adapters
c.
Riser
card
d.
Memory
modules
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.
88
Hardware
Maintenance
Manual
Summary of Contents for ThinkCentre 8086
Page 1: ...Hardware Maintenance Manual Types 8086 8087 8088 8089 Types 8090 8094 ...
Page 2: ......
Page 3: ...Hardware Maintenance Manual Types 8086 8087 8088 8089 Types 8090 8094 ...
Page 18: ...12 Hardware Maintenance Manual ...
Page 19: ...Chapter 2 Safety information 13 ...
Page 20: ... 18 kg 37 lbs 32 kg 70 5 lbs 55 kg 121 2 lbs 1 2 14 Hardware Maintenance Manual ...
Page 24: ...18 Hardware Maintenance Manual ...
Page 25: ...1 2 Chapter 2 Safety information 19 ...
Page 26: ...20 Hardware Maintenance Manual ...
Page 27: ...Chapter 2 Safety information 21 ...
Page 28: ...1 2 22 Hardware Maintenance Manual ...
Page 35: ...Chapter 2 Safety information 29 ...
Page 36: ...30 Hardware Maintenance Manual ...
Page 37: ...1 2 Chapter 2 Safety information 31 ...
Page 41: ...Chapter 2 Safety information 35 ...
Page 42: ...1 2 36 Hardware Maintenance Manual ...
Page 43: ...Chapter 2 Safety information 37 ...
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Page 154: ...148 Hardware Maintenance Manual ...
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Page 164: ...Part Number 19R2387 Printed in USA 1P P N 19R2387 ...