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• Bus mouse adapter cards
• Serial port adapter cards for COM3 or COM4
• Parallel port adapter cards for LPT2
• Internal modems
• Scanner interface cards
Troubleshooting Audio Hardware 267
All these cards use IRQ, DMA, and I/O port addresses, which in
some cases can overlap with default or alternative sound card settings.
Freeing Up IRQ 5 for Sound Card Use While Still
Printing
If you are using an LPT2 port card for a slow-speed device, such as
a dot-matrix or low-end inkjet printer, you can often free up its
default IRQ 5 by disabling EPP/ECP/IEEE-1284 modes. These modes
require use of an IRQ (ECP also uses a DMA channel). Reverting to
standard printing will cause most LPT ports to use only I/O port
addresses. This will enable you to use the port for printing and its
IRQ 5 for a sound card.
Other Sound Card Problems
Like the common cold, audio adapter problems have common
symptoms. Table 10.29 will help you diagnose sound card problems.
Table 10.29 Diagnosing Sound Card Problems
Symptom Cause Solution
No sound. Incorrect or missing Plug speakers into the correct jack
speaker wires. (stereo line out/speaker out).
No power to amplified Turn on; attach to AC adapter or
speakers. use fresh batteries.
Mono speaker attached
to stereo plug.
Use stereo speaker or headset.
Mixer settings too low. Adjust master volume setting;
turn off mute option.
Sound card might not be Test with diagnostic software
working. and sounds provided.
Sound card hardware Power down, then on again, or
needs to be reset. use reset button to restart PC.
Some games play, but Check hardware defaults as above;
others don’t. verify correct version of Windows
DirectX or other game API is
installed.