Service manual

Note: Ground loops carrying high voltages can burn some resistors and traces in
the audio input board. To replace the board remove the screw on top of the
board and unlock the XLR connectors from their shells turning the small self -
locking pins on the center of the XLR counterclockwise. Or contact the Meyer
Sound Service Department for links to service videos for this product.
9. Replace the audio input board with a known good board (either new or from
another unit. One quick technique is to swap the complete user panel with a
known good working unit), power up the unit and test it again. If signal is still not
present, remove the chassis cover from the amplifier and verify that the audio
ribbon cable on the control board is properly connected.
Check the RMS module for corrosion that could short the audio to ground.
Unplug the ribbon cable to the RMS module and retry.
Check the sense cable to the AC Mains to see if it is properly seated.
10. If all else fails, try replacing the control board. Replace the control board with
a known good control board (make sure it is the same model type) and retry.
Refer to Meyer Sound Self Powered Series TruPowerLimiting Upgrade
Procedure (# 17.033.042.01 for MP-2 and # 17.033.042.01 for MP-4). Or contact
the Meyer Sound Service Department for links to service videos for this product
11. If the unit still does not operate correctly please contact the Meyer Sound
Service Department [e-mail] to open an RA (Return
Authorization) to send the unit in for service.
I. Unit hums or has noise:
1. Disconnect the audio signal from the source and see if the noise goes away. If
the noise goes away, there is a problem with the audio source; external to the
enclosure.
2. If the noise does not go away, disconnect the audio cable from the amplifier, if
the noise goes away check the wiring of the signal cable. The audio signal cable
should be wired in a "balanced" configuration; that is, the audio signal should be
present between pins 2 & 3, never between 1 & 2 or 1 & 3.
NOTE: VEAM panels will hum if the audio input is not terminated.
3. If the unit has hum or noise without a signal cable connected, turn the unit off
and slowly remove the amplifier from the cabinet.
4. With the amplifier sitting on a firm surface, remove the eight (8) small head
screws from the user panel.
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