HP OmniBook 900 Service Manual page 59

Symptom Call Center:
Suggestions
Audio
Sound does not Check settings in BIOS
play Setup.
Increase sound volume
(Fn+UP and software
controls).
Check whether mute is active
(Fn+F7 and software
controls).
Check for sound resource
conflicts in Device Manager
(Windows 95/98) or
Administrative Tools or
Control Panel System
(Windows NT).
Sound does not Check settings in BIOS
record Setup.
Check software controls for
microphone—it should not be
muted in recording panel.
Note: The microphone
should normally be muted in
the master output panel.
Serial/Parallel
General problems Check settings in BIOS
Setup.
Check settings in Control
Panel (and in Windows NT
Diagnostics).
Infrared
General problems Infrared communication is
not supported in
Windows NT 4.0.
Infrared is disabled when
shipped. Drivers are included
but not installed when
shipped.
Check settings in BIOS
Setup.
Standard IrDA and fast-IrDA
are incompatible (they use
different drivers).
For fast-IrDA, check for DMA
conflict with ECP parallel
port.
USB
General problems USB is not supported in
Windows NT 4.0.
HP OmniBook 900
Repair Center: Repair Center:
Likely Causes Comments
Speaker. Check operation using
headphones or external
Motherboard.
speakers.
Top case Check operation using
(microphone). external microphone.
Motherboard.
Motherboard. Use loopback connector
during test—see page 3-14.
Motherboard.
Motherboard.
Troubleshooting and Diagnostics 3-9