HP OMNIBOOK 5500 Service Manual page 61

Symptom
Keyboard
Keyboard errors —
2 characters on a
keystroke instead
of one
Keyboard errors —
no response from
key(s)
Keyboard doesn't
respond, audio
slow, battery
problems
Unit Hangs or
Won't Boot up
Won't boot up &
no display
Unit hangs at
Win95 screen
during boot
Unit locks up after
2-3 minutes
Unit goes into
suspend after
"Bridge controller"
message, won't
resume
TrackPoint/Cursor
Cursor pointer
drifts slightly.
Cursor pointer
"flying" or drifting
excessively.
Cursor moves in
the opposite
direction of
TrackPoint
movement
Miscellaneous
Loses time
58
Call Center
Send in for repair
Send in for repair
Send in for repair
Verify known good
power source
Push reset button
Try pulling RAM
module and re-
inserting
Send in for repair
Eliminate any s/w
configuration conflicts
Send in for repair
Run BIOS upgrade
program
Send in for repair
Send in for repair
It is normal for the
cursor to drift slightly
as the circuit does
a self calibrate every
once in a while
Send in for repair.
Plug AC adapter into
unit and let it charge
for at least 24 hours.
Likely Cause Comments
(in order)
correctly.
PT-586 Damaged U10
PT-DC Shorted pins on
connectors
Keyboard
PT-DC Possible bad connector
solder joints
PT-586
Keyboard
PT-586 Damaged U10
PT-CPU Swap with reference CPU
to check. Replace
RAM module
original CPU if not fixed.
PT-DC
Make sure RAM is seated
PT-586
properly — remove and
PT-ICON
re-install to check.
PT-586 Possible burnt R92 hangs
up audio IC
PT-ICON Corrupt EEPROM — run
BIOS upgrade
PT-586 Damaged U10
Keyboard and Be sure keyboards are
palmrest. tested with the correct
palmrest. The latest
TrackPoint sensor (CTS)
Mismatched
must match up with a
palmrest and
CTS palmrest.
keyboard pair
Mismatched keyboards
and palmrests result in
the cursor moving
in the opposite direction
of intended movement.
Refer to Service Note
5500-04.
PT-586 Philips Refer to Service Note
IC
5500-01 for IC problem