Alpine mrd-m501 Repair

dj_square- · 31st August 2009, 04:08 AM

Alpine MRD-M501 Power Amplifier. It worked fine until one day the amplifier touched the trucks seat frame and sparked. It still powers up, and does not say there are any problems in the display. With my DMM I checked that I am getting proper voltage through the positive, rca's, but no voltage is shown out of the speaker terminals. I tried all the internal settings, and nothing changed. Any help on a repair? I have the necessary tools.

Glowbug · 31st August 2009, 04:51 AM

Any Zeners on the board that look toasted?

Perry Babin · 31st August 2009, 05:15 AM

What touched to the seat frame (speaker terminal, power terminal, case of the amp...)?

If you power it up, do you have any DC voltage on the case of the amp (black probe on the chassis ground terminal of the amp)?

Have you confirmed that the amp has 11+v on the B+ and remote terminals (black probe on the chassis ground terminal of the amp)?

Do you have a scope?

Can you pull the cover and power it up to check the DC voltage at several points?

31st August 2009, 04:08 AM	#1
dj_square- diyAudio Member Join Date: Aug 2009	Alpine mrd-m501 Repair Alpine MRD-M501 Power Amplifier. It worked fine until one day the amplifier touched the trucks seat frame and sparked. It still powers up, and does not say there are any problems in the display. With my DMM I checked that I am getting proper voltage through the positive, rca's, but no voltage is shown out of the speaker terminals. I tried all the internal settings, and nothing changed. Any help on a repair? I have the necessary tools.

31st August 2009, 04:51 AM	#2
Glowbug diyAudio Member Join Date: Feb 2006 Location: Hillsborough, NC/McLean, VA	Any Zeners on the board that look toasted? __________________ Jim J.

31st August 2009, 05:15 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What touched to the seat frame (speaker terminal, power terminal, case of the amp...)? If you power it up, do you have any DC voltage on the case of the amp (black probe on the chassis ground terminal of the amp)? Have you confirmed that the amp has 11+v on the B+ and remote terminals (black probe on the chassis ground terminal of the amp)? Do you have a scope? Can you pull the cover and power it up to check the DC voltage at several points? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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