Service manual

amplifier from the cabinet, look at the green speaker connector(s) on the top of
the amp chassis. Make sure that the connector(s) is fully seated. If it is not fully
seated, seat the connector and push the amplifier back in the cabinet. Apply
power and signal. If the unit still does not pass signal, unplug the unit and
remove it from the cabinet.
2. With the amplifier sitting on a firm surface, remove the eight (8) small head
screws from the user panel.
3. While slowly removing the user panel, verify the connection ribbon cable
connection to the input board is firmly seated. If so, disconnect the audio signal
cable from the input board on the user panel by disengaging the ribbon
connector. Disconnect the AC input connector (4 wire green connector) on the
AC Mains board.
4. Check the sense cable connection to the AC Mains board. Make sure that it is
connected properly.
5. If the unit still does not un-mute, the muting relay circuit on the control board or
the muting control circuit on the Power Supply module could be damaged.
6. Visually inspect the ribbon cable connection to the control board to make sure
it is firmly seated.
7. Try replacing the control board with a known good board (make sure that it is
the same type) to see if the problem clears up.
Refer to Meyer Sound Self Powered Series TruPower Limiting Upgrade
Procedure (#17.033.042.01 for MP/HP-2 and # 17.033.042.02 for MP/HP-4 ) or
contact the Meyer Sound Service Department for links to service videos for this
product or further assistance.
If the unit still does not un-mute, the power supply module is possibly damaged.
You can try module swapping with a known good working power supply from
another HP/MP amplifier.
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.
F. Unit powers up but Active LED does not light and no signal
passes:
1. If the amplifier is in the speaker cabinet, remove the eight (8) large head
screws that attach the amplifier to the cabinet. Remove the amplifier from the
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