HP Book 900 manual Serial/Parallel, Infrared

Symptom

Audio

Call Center:	Repair Center:
Suggestions	Likely Causes

Repair Center: Comments

Sound does not play

Sound does not record

Serial/Parallel

General problems

Infrared

General problems

USB

Check settings in BIOS 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).

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.

Check settings in BIOS Setup.

Check settings in Control Panel (and in Windows NT Diagnostics).

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.

Speaker.

Motherboard.

Top case (microphone).

Motherboard.

Motherboard.

Motherboard.

Check operation using headphones or external speakers.

Check operation using external microphone.

Use loopback connector during test—see page 3-14.

General problems

USB is not supported in	Motherboard.
Windows NT 4.0.

HP OmniBook 900 Troubleshooting and Diagnostics 3-9