MTX Thunder TH1200.1D, Owner'S Manual

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Troubleshooting
Problem Cause Solution
No LED indication No +12V at remote connection 12V to terminal
No +12V at Power connection 12V to terminal
Insufficient ground connection Verify ground connection
Blown power fuse Replace fuse
Power LED on, no output Volume on source unit off Increase volume on source unit
Speaker connections not made Make speaker connections
Gain control on amplifier off Turn up gain
Signal processing units off Apply power to signal processor
All speakers blown Replace speakers
Output distorted Head unit volume set too high Lower head unit volume
Amplifier gain set too high Lower amplifier gain
Balance reversed Speakers wired L + R reversed Wire speakers with correct orientation
RCA inputs reversed Reverse RCA input
Bass is weak Speakers wired out of phase Wire speakers with correct phase
Not using MTX woofers Buy MTX woofers
Blowing fuses Excessive output levels Lower the volume
Amplifier defective Return for service