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Troubleshooting
No power LED on control panel
Power LED is on but no other LEDs and no output
No output from condenser microphone(s)
Power light and output LEDs lighting but no output
FM tuner drifts from programme channel
USB player will not play audio from media
Output is very loud or LIMIT LED is on constantly
Output is working but at very low level
Feedback (loud squealing or howling from mics)
Amplifier is getting very hot
Note: for further troubleshooting, refer equipment to qualified service personnel for testing
Ensure IEC lead is in good condition and connected properly
Ensure mains outlet voltage is same as voltage selector
Check mains inlet fuse
Ensure POWER switch is on
Check input signals and condition of input connection leads
Check MASTER, MIC or LINE controls are not turned fully down
Turn down VOX control
Ensure Phantom Power is switched on (turn Master down first)
Check speaker leads are in good condition and connected properly
Check speakers are working (test on another amp if available)
Attach an FM antenna to the F connector on the rear panel
Switch unit off and then on again (tuning may drift with temperature)
Press CH- then PLAY/PAUSE to perform channel search + store
Press PLAY on transport controls
Check memory device is connected properly (remove and re-insert)
Check file types – standard compressed digital audio files required
Check memory device works on a PC or Mac for standard playback
Check level of input signal is not too high
Reduce channel volume and EQ settings
Reduce MASTER level until LIMIT light stops flashing
Ensure Hi-Z line level input(s) not connected via MIC1 or MIC2
Check input audio source level is not too low
Increase channel volume and EQ settings if turned down
Increase MASTER level
Check for quiet recording of media files on USB
Face microphone away from speakers and monitors
Reduce channel volume and EQ settings
Reduce MASTER level
Make sure fans are working properly and not obstructed
Ensure cooling vents are clear from debris and dust
Check that 4Ω or 8Ω speakers are not connected to 100V terminals
Ensure total 100V speaker wattage is not more than amplifier rating
Ensure that 100V and 4Ω or 8Ω speakers are not both connected
Ensure that total load across speaker jack outputs is not less than 4Ω
© Adastra 2011
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