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Trying to fix a Class D Alpine
Trying to fix a Class D Alpine
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Old 21st January 2021, 04:07 AM   #1
niqht is offline niqht  United States
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Join Date: Nov 2014
Default Trying to fix a Class D Alpine

Hello, I'm looking for any experienced advice on this thing. It is an MRV-F300 with a weak channel.

Its volume it about half of it's other pair and with a lot less bass. I can't quite tell the highs for sure, but it is without a doubt overall weaker. Nearly all of my searching on amp repair is power related, but on this I don't know if power can cause these symptoms and I can't find a service manual

Last edited by niqht; 21st January 2021 at 04:20 AM.
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Old 21st January 2021, 04:57 AM   #2
Mello4 is offline Mello4  United States
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I would look carefully for a failing aluminum electrolytic capacitor (leaking or bulging). Then maybe power switches, if all the caps look fine. If there are any dipped tantalum caps they could have failed from a voltage spike..
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Old 21st January 2021, 08:47 AM   #3
Perry Babin is offline Perry Babin  United States
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Is the 'bass EQ' on? That affects only 2 channels, it appears.
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Old 21st January 2021, 10:38 PM   #4
niqht is offline niqht  United States
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It is the rear, the right rear that is the issue. The left bumps hard, the right.. meh, with that boost off.



Although I did last night decide to put it back together and and retest some. Now that I see how these gain pots work as a stack and the many pole switches I should see if both sides are effected equally.
Then again.. maybe pulling the FETs out and properly testing first is worth it ?
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Old 22nd January 2021, 01:36 AM   #5
Mello4 is offline Mello4  United States
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There seem to have been a number people people fixing the Alpine MRV-F300 amplifier: https://www.diyaudio.com/forums/sear...rchid=24291030
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Old 22nd January 2021, 03:23 AM   #6
niqht is offline niqht  United States
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Only 2 of those apply, this is a reused model number. And those 2 are distinctly power related, this is not
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Old 22nd January 2021, 03:29 AM   #7
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Does every pot and switch work without noise or static when you operate them through their full range?
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