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Model 7900 7-Channel Power Amplifier
Owner’s Manual
Problem Solutions
Amplifier will not turn on Master Power Switches turned off (No power light LED):
Turn on both Master Power Switches.
Remote trigger cable not properly connected:
Verify connection of trigger cable at both ends.
Amplifier turns on, but no audio from
Input plugs not connected to proper jack or are loose:
one or more channels Check input connections.
Speakers not connected properly:
Check speaker connections at amp and speaker.
One or both of the AC power cords are not receiving power:
Ensure both power cords have power. The amplifier is actually two power amplifiers in one–a
3ch amplifier and a 4ch amplifier. One cord powers the 3ch amp and the other cord powers
the 4-ch amp. Two power controllers are used so these operate independently. If one breaker
(on the unit) is tripped or if there is no power for one cord, a group of channels will be down.
Depending on which has power, either 3 channels will be lost or 4 channels will be lost. The
standby/on led will be dimmer than for normal operation, but this may not be readily noticed.
Audio levels differ Improper settings or output levels from the processor or controller:
Check the settings on your preamp, processor or controller.
Audio plays, then cuts off Amplifier shorted:
Check speaker connections for short circuit at amp and speaker.
Troubleshooting
60Hz AC
Ground Loop
60Hz AC
Ground Loop
AC Ground
AC Line
A/V
Cables
Main House
Grounding
Cable Feed
Coax Cable
Ground Loop Diagram
AC Line
Set-top Box
Troubleshooting Guide