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Basic Field Troubleshooting & Repair
Issue
Power Won't Turn
On
Power Shuts Off
Suddenly
No Sound
Distorted Sound
Hum/Buzz Sound
Potential Causes
Speaker is not connected to
a power source
Speaker power cable is not
connected properly or
faulty.
Speaker fuse blown.
Speaker is not turned on.
Input cable is not connected
properly or faulty.
No signal.
Input signal is too low.
Level knob is set too low.
Speaker limiting
Input signal clipping
Ground loops, A/C
grounding issues
Signal input cable is
unbalanced and too long.
Potential Solutions
Connect speaker to power source using a properly-
rated power cable.
Swap power cable with a known-good cable.
Replug cable into speaker power connector.
Replace fuse.
Turn on speaker.
Swap cable with a known-good cable.
Replug cable into signal input connector.
Check signal source.
Increase the gain at the signal source or using the
level knob.
If using a microphone as a source, be sure the
Mic/Line switch is set to Mic position.
Slowly increase the input gain by turning the level
knob clockwise.
Check limit light – if the limit light is blinking
frequently or statically lit, reduce volume levels
accordingly.
Make sure input signal source is not being
overdriven
Remove signal ground
Use a balanced cable or a shorter unbalanced cable
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