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Old 8th March 2012, 05:34 AM   #1
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Join Date: Oct 2006
Location: Storvreta
Default DENON POA-6600A

So.... then it was my turn.....

I got a flash shooting out of one of the speaker cables when I war removing it from an electrostatic speaker.
The amp got into protection mode and then back on.
But now it has now sound what so ever.
Turning the input level on the amp made the amp go into protection mode.

I opened it up and started to do a fast fault finding by switching boards with the working amp.

Protection board= GOOD.
Input board= NOT GOOD.
Input board with the IC401 (NJM2068AD) was not working as it put the good amp into protection mode when using BALANCED input.

Finally when I put the healthy protection and input board (front part of amp) into the faulty amp, I got no sound and it got into protection mode.

So Amp-board= NOT GOOD either!

I stumbled upon a faulty zener diode D502 (HZ-15-2).
There may be some more faulty circuitry, but for now this is what I have found.

So, are there any GOOD equivalent parts for the NJM2068AD and the HZ15-2 zener?

Cheers from Sweden!

The one who succeeded was the one who didn't know it was impossible.

Last edited by JarreYuri; 8th March 2012 at 11:39 AM.
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Old 8th March 2012, 05:50 AM   #2
Lavcat is offline Lavcat  United States
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Location: New Jersey USA
No answer for you, but I have a non-working Denon POA-6600 and a semi-working Denon POA-6600 that someday I may take apart.
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Old 8th March 2012, 11:24 AM   #3
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Cool story bro.
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Old 8th June 2012, 07:32 PM   #4
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Join Date: Oct 2006
Location: Storvreta
Anyway, I managed to repair it.
I used 513-NJM2068DD dual op-amp for the input and I used Vishay 78-TZX15C for the zener exchange.
I also found 3 places where traces had burned of from the main board.

I also took the chance to replace all of the electrolytic capacitors.

So now it's up and running.
The one who succeeded was the one who didn't know it was impossible.
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