DENON POA-6600A schematic wanted !! - Page 7 - diyAudio
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Old 28th July 2011, 06:40 PM   #61
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That sounds quite logical.
Do You know where I can find the schematics for the 6600A?

I have no problem with them, but I would like to have it if I find the time for some component upgrades.
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Old 28th July 2011, 06:44 PM   #62
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I can send those to you... Just let me know your e-mail because the files are quite large.
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Old 28th July 2011, 06:59 PM   #63
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It's jerker.lindborg@gmail.com
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Old 28th July 2011, 07:16 PM   #64
RCruz is online now RCruz  Switzerland
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Just sent a ZIP with the schematic.
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Old 28th July 2011, 08:52 PM   #65
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Thanks a lot!!
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Old 7th March 2012, 06:36 PM   #66
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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 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!

Jerker
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Old 24th March 2012, 07:48 PM   #67
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Quote:
Originally Posted by bekim View Post
Hi Ricardo,

regarding helping you to find original 2sa1492/2sc3856 I don't believe that I can help somehow. I live in Kosova and, all parts which I order are from asia - somewhere, don't know the origin precisely.

biasing diodes you have to replace only, not all. You point on those near zener diodes like, D511, D514, DS515, D516, D517, D518, D519, D520 these are 1S2076, and you can change them with 1n4148. Diodes D512 & D513 are zener HZ5C1 you can replace with BZX5V1 if you cannot find original ones.

OP's IC601 & IC602 you can change with NE5532, or NJM2068AD in both places, I did this on one broken amp like yours until I fix it then, I put new original ones. But, if you're sure that, those IC's are ok, don't change them. Eventhough, you can replace both IC's with M5238 when you finish fixing your amp.

TR601 is placed near R608 and C604 on your power amp board. Desolder it and check does it show short circuit, and if is ok put it back.

You can use 2SA1294/2SC3263 but, remember to not destroy all transistors on output, put just one pair on power amp board; example TR513 & TR514. You can always put any other cheaper trans there even fakes, just to see does it work. just make sure that bipolars you will use for testinga re not darlingtones.


replace all these electrolytes - is highly recommended:
C501, C507, C508, C523, C547, C601, C602 - 10uF/50V, you can replace with 10uf/63V;
C604 10uF/16V;
C516, C517 - bipolars 1uF/100V;
C524 22uF/100V;
C543 & C544 10uF/100V bipolars.

I don't know how old this amp is, therefore all these electrolytes are better to be replaced. condensers are pretty annoying and difficult to be sure that old ones are ok, regardless how much time you spent on measuring them.



bekim
Noteworthy is that C507 is bipolar!
And You forgot about the important C591 that is 10uF 35V.
This on the POA 6600A.

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