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3-10 Troubleshooting and Diagnostics HP OmniBook 4100/4150
Symptom Call Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Audio
Sound does not
play
Check settings in BIOS
Setup.
Increase sound volume
(Fn+UP and software
controls).
Check whether mute is active
(mute button and software
controls).
Check for sound resource
conflicts in Device Manager
(Windows 95/98) or
Administrative Tools or
Control Panel System
(Windows NT).
Speakers.
VGA PCA
(OB 4150†).
Motherboard.
Check operation using
headphones or external
speakers (audio jack PCA).
Sound does not
record
Check settings in BIOS
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.
Inverter PCA (mic).
Motherboard.
VGA PCA
(OB 4150†).
Check operation using
external microphone (audio
jack PCA).
Serial/Parallel
General problems Check settings in BIOS
Setup.
Check settings in Control
Panel (and in Windows NT
Diagnostics).
Motherboard. Use loop-back connector
during test—see page 3-15.
Infrared
General problems Infrared communication is
not supported in
Windows NT 4.0.
Infrared is disabled and no
drivers installed as shipped.
(Drivers are included.)
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.
IR PCA.
Motherboard.
USB
General problems USB is not supported in
Windows NT 4.0.
Motherboard.