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Alpine MRV-T503 Repair Help
Alpine MRV-T503 Repair Help
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Old 25th September 2013, 10:14 PM   #1
Zookz is offline Zookz
diyAudio Member
Join Date: Apr 2013
Location: Geogia
Default Alpine MRV-T503 Repair Help

I have an Alpine MRV-T503 to repair and I'm wondering if anybody has a schematic for this amp so I can replace burnt parts. It appears the following is burnt:
* R501
* Q901
* R903
* R904
* And the two bigger capacitors next to the burnt parts are swollen

Any help would be great! Thanks!

Here's some pictures to help:
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Old 26th September 2013, 04:18 AM   #2
1moreamp is offline 1moreamp  United States
diyAudio Member
Join Date: Dec 2005
Location: Northern California
Looks like your amp was hooked up backwards to power and ground. large caps are bad and need to be replaced, along with a bunch of other things most likely.
I don't have the schematic but its available form some of the pay schematic services on the net I'm fairly sure. You will have to pull the board out of its case but I am thinking you will have flashed open trace or two on the bottom of the board < something had to give up when it was failing like this >

Power supply power devices might also be burnt, along with PWM chip and voltage comparator circuitry.
I'm actually old enough to remember this amp new so, I have seen a few with your troubles before. Its fixable, but not an easy repair due to PC board damage and such. I have also seen this when the supply power devices shorted out, so its either or that caused this.

Have you ohm'ed out the power devices clamped to the sink on the edge of the card??? I would before treading too much farther. And google search the web for the schematic, You can start by trying here first:
Manual-Archives | Service Manuals & Schematic Diagrams

Hope this helps some...
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