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AVR 300 Powers up, 8 seconds, powers off

My AVR 300 is 4 years old and has developed a problem.

It will power up and begin it's self check, then shuts off.

I opened it up, and there is a large capacitor (3300Uf) on
what looks like the Digital Analog board (the big board that
lays flat along the bottom of the chassis under the add-on
cards, which is bulging. It also has a darkening of the
board under that capacitor like it has been heating and cooling there.

I can't see any other caps that are bulging, including the
4400uf.
The diodes around that cap are larger than the others on
that board.

Someone mentioned that they had a PDF file for this model, which was a schematic?

It was expressly for finding the problem diodes. But Id
be curious if anyone has any thoughts on this
heit
jonross
1 posts
 
Thanks for this folks! Was considering a used 350, but now ... not.
bambooken's avatar
bambooken
4 posts
 
I'm going to try to revive this thread by adding my troubles with my Arcam AVR350.
All digital inputs result in speaker abusing, crackling static with a tiny bit of actual sound output blended in. I've found one other person with this problem and they were told (back in 2013) by Arcam that a few diodes need to be replaced. 
My problem is that I cannot find any repair place that can do the work. I'd be very grateful if anyone out there has a referral for me and / or similar experience. 

TIA
bmdduck
99 posts
 
Look up Condor Audio (in Israel).  He offers repair service on Arcam AVRs and his web site has a very good tutorial on his repair process.  He will also sell you parts and provide instruction if you want to DIY.  I repaired my AVR300 with his parts and instruction which was very helpful.

Good luck repairing yours.

bmdduck
erik_squires
16,049 posts
 
One hack I apply to routers is to find a 5V suppy somewhere and attach a fan. You'd be surprised how helpful a half dollar sized mini fan can be> :)


notlem
4 posts
 
I've heard of the digital issue before.  I've a feeling it's documented on that Israeli guy's report.  IIRC the chip looking after the digital processing is run over voltage and so has a crazy failure rate.  It's out of production and I don't think there's a straight replacement.

You'd need to get hold of a replacement chip then do the documented mod to lower the supply voltage to it so it doesn't cook the new one too.
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