Self-Powered Concert Series
Service Manual
MP-2/4 Amplifier
Doc #: 05.033.040.01
Rev.: A
Date: 08/31/98
Page: 18 of 26
© 1998 Meyer Sound Laboratories, Inc. All rights reserved.
f) If one of the Amp/heatsink modules is found to be good, replace its Control board, and install
the Amp/heatsink module into the chassis.
Caution: Connect the brown DC harness to the module as the white DC harness is currently disconnected
When plugging the large brown DC power connector into the amp board. Make sure the connector is not
shifted over one pin to the left or right. Also support the board to prevent bending.
h) Repeat the power up sequence as listed in step 19.
g) If the unit still will not power up, it is likely that the Amp/heatsink module has damage to
circuits other than the MOSFETs. Remove the module and replace it as well.
21. If any of the previous three conditions (step 19) are not met, the AC mains board or the
Power Supply could be damaged. If this is the case, continue to step 22.
22. 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. Removethe audio signal cable from the audio input board by disengaging the
locking gray connector. Also remove the AC input cable from the AC mains board (4 wire
green connector).
23. Remove the sense cable (gray ribbon cable) and the transformer primary connector (8
wire green connector) from the AC mains board.
24. While firmly holding the AC mains board, remove the three (3) screws on the top of the
chassis and remove the entire board.
25. 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.
26. If the three conditions stated in step 19 are met this time, the Power Supply circuits are
probably functioning properly. It is most likely that the AC Mains Board is damaged and
will need to be replaced. You can refer to Meyer Sound Self Powered Series MP-2/4 AC
MainsService Procedure (#17.033.022.01) for replacement procedures for the AC Mains
board.
27. If the unit still does not power up properly, it is likely that the Power Supply module
is damaged. As Power Supply module failures are rare, it is recommended that you return
the unit to the nearest authorized service center for further evaluation.
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