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 🙁
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 🙁
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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..
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 ?
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 ?
There seem to have been a number people people fixing the Alpine MRV-F300 amplifier: https://www.diyaudio.com/forums/search.php?searchid=24291030
Only 2 of those apply, this is a reused model number. And those 2 are distinctly power related, this is not 🙁
Does every pot and switch work without noise or static when you operate them through their full range?