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Old 9th July 2012, 07:26 AM   #1
nico is offline nico  United States
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Default Adcom 535 popping

Hi, I have Adcom GFA-535 and it pops once in a while (randomly). I can not tell which channel. When I wait for the pop standing close to the speaker, it never happens.

Q: If I recap would it solve the problem?

Any suggestion is appreciated. Thanks.

Nico
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Old 9th July 2012, 02:03 PM   #2
djk is offline djk
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I would check all the solder joints first.

It could be the bias pot getting flaky.

Small-signal plastic transistor may develop PCN (pop-corn-noise).

It could be anything, but the caps would be lower on my list of suspects. On the other hand, if the amplifier is older than 10 years it will likely be needing them sooner than later.
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Old 9th July 2012, 02:22 PM   #3
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common failure is around servo ic single supply there, plus zener and local stabilization capacitor fail quite often ...

go for the capacitors and soldering first , then it could be something else
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Old 9th July 2012, 03:59 PM   #4
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"common failure is around servo ic single supply there"

Are you sure there is even a servo in a GFA 535?

I think not.
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Old 9th July 2012, 04:05 PM   #5
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sorry Djk i might be wrong but i think yes IC 601- and 602 is the offset servo for this amp same as 545 if i am wrong please correct me . Thanks

Kind regards
sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 9th July 2012, 04:55 PM   #6
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The 535 and 545 are made on the same circuit board, and never had a servo when I sold and serviced them as an Adcom dealer.
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Old 9th July 2012, 05:02 PM   #7
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do i make some serious mistake ? what is the use of IC 601 and 602 ? then ?
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 9th July 2012, 05:09 PM   #8
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Post a link to the schematic you are viewing please.
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Old 9th July 2012, 05:20 PM   #9
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there you go
Attached Images
File Type: jpg 535.JPG (179.5 KB, 100 views)
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Old 9th July 2012, 05:39 PM   #10
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That's a GFA 535II, nico said he has the GFA535.
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