Troubleshooting - Black Box AC470A Manual

If you determine that your Internal Audio System is not working properly,
there are several steps you can take to resolve the problem yourself.
Trouble
Distorted Sound.
Weak or no sound
from either or both
speakers.
Microphone recording
is distorted.
LEDs aren't lit.
If these solutions do not resolve the problem, then contact Black Box
for additional technical support. Remember, this unit contains no user-
serviceable parts. Do not attempt to alter or repair it yourself.

6. Troubleshooting

Cause
— Volume up too high.
— Bad or incorrect
connections.
— Input level from sound
card or other external
sound source is too low.
— Connections are loose.
— Switch A is set to
DIRECT when input is
driven by sound card.
— Sound source is not
present.
— Switch B is not set to
SOUND BOARD (In).
— Connection to the internal
PC power source may not
be secure.
CHAPTER 6: Troubleshooting
Solution
— Reduce the volume.
— Make sure that all
connections are made,
and that the connectors
are properly seated.
— Increase the input level
from sound card or other
external source.
— Tighten any loose
connections.
— Set Switch A to
AMPLIFIED (In).
— Check for presence of
sound source.
— Set Switch B to SOUND
BOARD (In).
— Make sure the power-
source connection is
made and properly
seated.
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