DM series mixer-amplifiers User Manual
Troubleshooting
No power LED on control
panel
Ensure IEC lead is in good condition and connected properly
Ensure POWER switch is on
LED display is lit but no
output
Check input signals and condition of input connection leads
Check level controls are turned up
Check file type on USB or connection via Bluetooth is OK
Check MASTER, MIC, LINE IN or MEDIA controls are turned up
Check speaker output terminals are connected correctly
Check speakers are working (test on another amp if available)
USB player will not play
audio from media
Press PLAY on transport controls
Check memory device is connected properly (remove and re-insert)
Check file types – standard mp3 files are required
Check memory device works on a PC or Mac for standard playback
No connection via
Bluetooth
Check that the sending device is connected to the correct “MP3A”
ID
Check the volume output level of the sending device
Output is very loud or
distorted
Check level of input signal is not too high
Turn down Level, Bass and Treble controls or reduce level of input
signal
Ensure Hi-Z line level input(s) not connected via MIC input
Output is working but at
very low level
Check input audio source level is not too low
Turn up Level, Bass and Treble controls
Check for quiet recording of media files on USB
Face microphone away from speakers and monitors
Turn down MIC volume control
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 lower than the amplifier rating
Ensure that 100V and 4Ω or 8Ω speakers are not both connected
Ensure that total load connected to 4-16Ω output is not less than 4Ω
Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical or
Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life.
The goods must be disposed of according to your local council guidelines.
Errors and omissions excepted.
Copyright© 2017. AVSL Group Ltd.
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