SELF-POWERED CONCERT AND M SERIES SERVICE MANUAL For MP-2/4, HP-2/4 & MPW-4 amplifiers 2012
MEYER SOUND LABORATORIES MSPN: 05.033.040.
Introduction From the very beginning, the Meyer Sound Self-Powered Concert and M Series products were designed with the customer in mind. Not only are they easy to set up and use, but they are also easy to service. You will find that the MP-2 & 4, HP-2 & 4 and MPW-4 amplifiers used in the Self-Powered Concert and M Series are completely modular. With the exception of the control boards, most of the modules are interchangeable with any of the Self-Powered Concert or M Series products.
Recommended Documentation: Meyer Sound Self-Powered Series Speaker Service Documentation Package Available on CD pn: 18.033.083.01 Also, by contacting the Service Department at Meyer Sound you can obtain links to service videos for the MP/HP amplifiers and M’elodie/MJF products. Pre-Service Checks and Precautions: 1. When servicing any electronic assemblies, a clean low static bench should be used and internal assemblies should be kept free of metallic debris. 2.
Audio In earth AC in neutral fuse CONTROL BOARD Audio In Channel B Channel A -15VDC ground +15VDC mute RMS (OPTIONAL) AC MAINS to Drivers AMP HS +15VDC GND -15VDC from here mute starts +108VDC hot see DC harness on pg 8 POWER SUPPLY -108VDC secondary from transformer not used transformer primary +15VDC Transformer CRNT Ground -43VDC GND B GND A +43VDC fuse see DC harness on pg 8 MP/HP/MPW AMPLIFIER BLOCK DIAGRAM Mute Temp Fault -15VDC REF Ground
SECTION I - MP/HP/MPW Amplifier Modules Amplifier User Panel (rear of loudspeaker): The user panel is divided into two main sections: AC power and audio input. The AC power is applied to the system via a L6-20 twist-lock, IEC 309, Powercon, or VEAM connector. MP-2 amplifiers use 6 amp breakers MP-4 amplifiers use 8 amp breakers HP-2 amplifiers use 10 amp breakers HP-4 amplifiers use 15 amp breakers MPW-4 amplifiers use 10 amp breakers.
If you do not hear the relays click verify the AC line voltage by measuring the User Panel phoenix connector. Troubleshooting/solution: You can try swapping the AC Mains module with a known good working module to verify the problem in the original "suspect" AC Mains. Connections: With the User Panel removed from the amp chassis, disconnect both the green phoenix connector and the grey sense cable.
MSL-4 to a 650-P for 2 channel MP amps; MTS-4A to a PSW-6 for 4 channel MP amps; M3D to MILO for 4 channel HP amps and 700HP to 600 HP for 2 channel HP amps You will want to make note of these changes, externally on the amp and also change the LED label on the user panel to correctly identify the LED operation. Troubleshooting note: It is possible that if something went wrong on this board it could stop the unit from passing signal. Try module swapping with a known good working unit to verify.
The signal goes from the input board to the control board to the amp heatsink assembly which employs a Class AB/H amplifier. Symptom: Unit faults or shuts down immediately upon power up There are only two reasons that an HP/MP amplifier will shut itself off. 1) DC on one or all of the outputs 2) too high of temperature detected on the amp heatsink module. The most likely module to cause DC voltage to be present on one or all of the outputs is the amp HS assembly.
Caution: Be careful not to overflex the circuit board when removing the power harness connector. The connector fits very snug; rock the connector length-wise to work loose. 7. Lift the amp heatsink module out of the chassis and set aside. Do not remove the control board from the amp heatsink assembly at this time. 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. It will void any potential warranty.
Remove the audio signal cable from the audio input board by disengaging the locking connector. Also remove the AC harness from the AC mains board (4 wire green connector). 11. Remove the sense cable (gray ribbon cable) and the transformer primary connector (7 wire green connector) from the AC mains board. 12. While firmly holding the AC mains board, remove the three (3) screws on the top of the chassis and remove the entire AC Mains module. 13.
You can contact the Service Department for links to service videos on this product. 2. 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 cabinet slowly, taking care to unplug both green speaker connectors on the top side of the amplifier. 3. With the amplifier sitting on a firm surface, remove the four (4) screws from the amp chassis cover and remove the cover. 4.
. Return the unit to the upright position and disconnect the audio signal ribbon cable from the bottom control board by unlocking the connector. 14. Remove the green four (4) pin male connector mounted on the top edge of the amplifier chassis; this leads to the bottom amp heatsink assembly. Note: Two (2) nuts with lock washers secure the two (2) screws. Make sure to remove these nuts from the chassis. 15.
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.
Note: If the AC voltage exceeds 270 VAC, the AC mains board may be damaged. 2. Verify that the breakers are not tripped. If the breakers are tripped, do not reset. See section A for details. 3. 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 cabinet slowly, taking care to unplug the green speaker connector(s) on the top side of the amplifier. 4.
remove the sense cable (gray ribbon cable) and the transformer primary connector (7 wire green connector) from the AC Mains board. 10. While firmly holding the AC Mains board, remove the three (3) screws on the top of the chassis and remove the board. 11. If the unit was subjected to overvoltage conditions (> 270 VAC), the AC Mains board fuse could be damaged. Locate the fuse (F1) on the AC Mains board (between Relay 1 and the AC input connector) and check the continuity with an ohmmeter.
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.
cabinet slowly, taking care to unplug the green speaker connector(s) on the top side of the amplifier. 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, disconnect the AC input connector (4 wire green connector) on the AC mains board. Check the audio ribbon cable connection on the audio input board. If the connection is loose, reconnect the audio ribbon cable firmly.
(# 17.033.022.01) or contact the Meyer Sound Service Department for links to service videos for this product or further assistance. 3. If the unit still cycles on/off please contact the Meyer Sound Service Department service@meyersound.com to open an RA (Return Authorization) to send the unit in for service. H. Unit turns on, but no signal passes or signal intermittent: 1. With the unit on, check the audio signal source for adequate input level. Also check that signal passes with a known good unit. 2.
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.
5. While slowly removing the user panel, disconnect the audio signal cable from the input board on the user panel by disengaging the ribbon connector. Also disconnect the AC input connector (4 wire green connector) on the AC mains board. 6. Using a magnifying glass, inspect the solder joints of the audio input board for broken solder joints. Inspect the locking connector, the XLR connectors and the Input polarity switch.
4. Check to see that the units in question are either all TPL or all non-TPL. Using TPL and non-TPL together may produce audible differences at the different limiting thresholds. K. Unit has distorted output: 1. Try running the same signal (individually, not looped) into two similar units. If both units are distorted, check the signal source level for overload. 2.
