TROUBLESHOOTING
In the event that your amplifier appears not to work correctly, often enough the problem is not with the amp, but a related piece of
equipment that it’s necessary to take a deliberate, systematic approach to troubleshooting in order to effectively identify and correct
the problem. Yes, believe it or not, we have seen all of these things many times. Flip the MUTE SWITCH to the PLAY (down) position
and enjoy the ride!
SYMPTOM
NO AUDIO OUTPUT
Is the power LED lit and do the indicator LEDs over the function switches work?
NO: Possible causes to check in this order are:
1. Verify the power source, verify that the IEC power cable is not damaged and is fully inserted into its socket,.
2. Verify that nobody unplugged your amp or turned off your power strip when you weren’t looking (if so, blame the guitar player,
turn on and play.)
3. If these do not solve your problem, it’s possible that your amplifier has failed so call our customer service department and we
will help you get this resolved.
YES: Possible causes to check in this order are:
1. MUTE switch engaged (turn mute function off)
2. INPUT or MASTER controls turned down (turn the controls up)
3. Defective speaker cable or cabinet (test known good speaker cable and cabinet)
4. Defective bass or cable (test with known good bass and cable)
5. There is indeed a problem with your amp, call our customer service department and we will help you get this resolved.
SYMPTOM
DISTORTED AUDIO OUTPUT
1. Defective battery in active bass causing instrument’s onboard preamp to distort (replace battery)
2. With very hot 18V basses, it’s possible to overdrive the amp’s preamp when in passive mode (switch to active mode)
3. Slightly intermittent cable in system (this can be an instrument cable, patch cable or loose screw in SpeakOn plug)
4. Defective or blown speaker(s) in cabinet (test with known good cabinet, repair cabinet as needed)
5. There is indeed a problem with your amp, call our customer service department and we will help you get this resolved.
SYMPTOM
NOISE (POPPING) IN AUDIO
1. Popping while playing, especially one string. (check bass set-up to be sure there is adequate clearances between the string and
pickup pole pieces.)
2. Popping while just sitting there, or when touched. (under dry environmental conditions, it’s possible that electrostatic discharge
is the cause. (try antistatic mat on floor, humidifier in room)
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