Table of Contents
Related Manuals for Meyer Sound MP-4
Summary of Contents for Meyer Sound MP-4
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Page 1: Service Manual
Doc #: 05.033.040.01 Self-Powered Concert Series Rev.: Service Manual Date: 08/31/98 Page: 1 of 26 MP-2/4 Amplifier Self-Powered Concert Series MP-2/4 Amplifier Service Manual © 1998 Meyer Sound Laboratories, Inc. All rights reserved. -
Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION SECTION I: MP-2/4 AMPLIFIER SYSTEM DESCRIPTION A) MP-2 Exploded view diagram and parts list B) MP-4 Exploded view diagram and parts list C) System block diagram. D) Explanation of system block diagram. SECTION II: TROUBLESHOOTING FLOW CHART... -
Page 3: Introduction
Not only are they easy to set up and use, but they are also easy to service. You will find that the MP-2 and MP-4 Amplifiers used in the Self-Powered Concert Series are completely modular. With the exception of the Control boards , all of the modules are interchangeable with any of the Self-Powered Concert Series products. - Page 4 Refer to “Low Driver Inspection and Evaluation Procedure for Self Powered Series Products” (# 17.010.120.01). A fatigued driver should always be replaced using an HTS grade driver. © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
- Page 5 A) MP-2 Exploded View Diagram The illustration below shows how all of the individual modules for the MP-2 amplifi- ers interconnect. Please note that some modules are used in MP-4 amplifiers as well. For current pricing please reference to the Meyer Sound Price List.
- Page 6 MP-2/4 Amplifier B) MP-4 Exploded View Diagram The illustration below shows how all of the individual modules for the MP-4 amplifi- ers interconnect. Please note that some modules are used in MP-2 amplifiers as well. For current pricing please reference to the Meyer Sound Price List.
- Page 7 This option allows you to monitor remotely certain parameters of the amplifier while in use. As this module is quite complex, no system block will be given at this time. However, a brief explanation of the connections follows: © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
- Page 8 Input board are also monitored by the Communications module for limiter activity and polarity switch positions. In the case of the MP-4, the ribbon cable expands to 21 lines (staggered on the 26 pin connector). Of those 21 lines, 5 lines split off to connect to the second TPL Control Board (allowing the additional signals to be monitored).
- Page 9 There is an output current sense circuit located on this board as well. It feeds off of the return leg of the driver and sends the output current waveform to the TPL Detector circuit on the TPL Control Board SYSTEM BLOCK NOTE: Connector pin-outs may not match the illustration. © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
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Page 10: Section Ii: Troubleshooting Flow Chart
& off in a Part F cyclical fashion? If the unit still does not power-up normally, consult the system block diagram or contact your nearest Meyer Sound service representative. © 1998 Meyer Sound Laboratories, Inc. All rights reserved. -
Page 11: A) Circuit Breakers Trip On Power-Up Or During Use 2-Channel Versions
9. If the previous three conditions are met, the power supply circuits are probably func- tioning properly. It is most likely that the Amp/heatsink module is damaged and will need to be replaced. Refer to Meyer Sound Self Powered Series MP-2 Amp/Heatsink Service Procedure (# 17.033.013.01) for replacement procedures. - Page 12 Also remove the AC input cable from the AC mains board (4 wire green connector). 13. Remove the sense cable (gray ribbon cable) and the transformer primary connector (8 wire green connector) from the AC mains board. © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
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Page 13: Channel Versions
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. - Page 14 17. Position the AC mains board inside the chassis and replace the three (3) screws into the top of the chassis to reattach the AC mains board bracket. 18. Connect the sense cable and the transformer primary cable. Also replace the user panel. © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
- Page 15 If any FET has a resistance of less than 5 ohms, the module will need to be replaced. Refer to Meyer Sound Self Powered Series MP-4 Amp/Heatsink Service Procedure (#17.033.013.02). © 1998 Meyer Sound Laboratories, Inc. All rights reserved.
- Page 16 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.
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Page 17: B) Unit Does Not Power Up
9. If the AC mains board appears undamaged, remove the Board. To do this, remove the sense cable (gray ribbon cable) and the transformer primary connector (8 wire green connector) from the AC mains board. © 1998 Meyer Sound Laboratories, Inc. All rights reserved. -
Page 18: C) Unit Powers Up And Immediately Shuts Off
Locate the fuse (F1) on the AC mains board (between Relay 1 and the AC input connector) and check the continuity with an ohmmeter. If the fuse is open, the AC mains board will have to be replaced. Refer to Meyer Sound Self Powered Series MP-2/4 AC Mains Service Procedure (# 17.033.022.01). -
Page 19: D) Unit Powers Up, But Does Not Unmute (Pass Signal)
Refer to Meyer Sound Self Powered Series TruPower Limiting Upgrade Procedure (# 17.033.042.01 for MP-2 and # 17.033.042.02 for MP-4 ). If the unit still does not un-mute, the Power Supply module is probably 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. -
Page 20: E) Unit Powers Up, But Active Led Does Not Light And Signal Does Not Pass
7. Replace the control board with a known good control board (make sure it is the same type) and retry. Refer to Meyer Sound Self Powered Series TruPower Limiting Upgrade Proce- dure (# 17.033.042.01 for MP-2 and # 17.033.042.01 for MP-4). -
Page 21: F) Unit Turns On And Off In A Cyclical Fashion
2. If the line voltage is stable, try replacing the AC mains board with a known good one. Refer to Meyer Sound Self Powered Series MP-2/4 AC Mains Service Procedure (# 17.033.022.01). 3. If the unit still cycles on/off, return the unit to the nearest authorized service center for further evaluation. -
Page 22: H) Unit Hums Or Has Noise
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 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). -
Page 23: I) Unit's Output Degrades When Paired With Other Units
8. 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 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). -
Page 24: J) Unit Has Distorted Output
3. Replace the Control board with a known good control board (make sure it is the same type) and retry. Refer to Meyer Sound Self Powered Series TruPower Limiting Upgrade Proce- dure (# 17.033.042.01 for MP-2 and # 17.033.042.01 for MP-4).