Service manual

culprit. If the three previous conditions are not met, the bottom amp heatsink
likely needs to be replaced.
Caution: Never disassemble the amplifier PCB board from the heatsink. The
torque on the FET’s is an exact measurement and should not be tampered with.
If the top or the bottom amp heatsink module needs to be replaced, please refer
to Meyer Sound Self Powered Series MP-4 Amp Heatsink Service Procedure
(#17.033.013.02) for replacement procedures or contact the Meyer Sound
Service Department for links to service videos for this product or further
assistance.
21. To assess the power supply system, unplug the unit and allow the supplies
to bleed (about 3 minutes). Remove the eight (8) small head screws from the
user panel and remove the panel. Remove the audio signal cable from the audio
input board by disengaging the locking ribbon connector. Also remove the AC
input cable from the AC Mains board (4 wire green connector).
22. Remove the sense cable (gray ribbon cable) and the transformer primary
connector (7 wire green connector) from the AC mains board.
23. While firmly holding the AC mains board, remove the three (3) screws on the
top of the chassis and remove the entire board.
24. Replace the AC Mains board with a known good board (either new or from
another unit). Make sure to reconnect the sense cable and the transformer
primary connector. Replace the user panel and repeat the power up sequence as
stated in step 19.
You can refer to Meyer Sound Self Powered Series MP-2/4 AC Mains Service
Procedure (#17.033.022.01) for replacement procedures for the AC Mains
Board or contact the Meyer Sound Service Department for links to service videos
for this product or further assistance.
26. If the unit still does not power up properly, it is likely that the power supply
module is damaged.
You can refer to Meyer Sound Self Powered Series MP-2/4 Power Supply
Service Procedure (#17.033.076.01) for replacement procedures for the Power
Supply board or contact the Meyer Sound Service Department for links to service
videos for this product or further assistance.
C. Unit does not power up:
1. Using a voltmeter, check the AC voltage supply to the amplifier. Make sure
that the voltage is within the specified operating range as listed on the user
panel.
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