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Mattyo5 15th May 2003 09:39 PM

Adcom Schematic Needed Gfa-545 Ii
Ok, I'm trying to fix an adcom GFA-545 II amp ...I can see 2 caps are blown out, which I can replace if I knew the value. Any layout, schematic, service manual would be great. Anyone? Link? Thanks!

-Matthew K. Olson

if you happen to HAVE a 545, can you look inside it please and let me know the value of cap c605 and c606 (those are the labels on the boards) Thanks ya'll!

-Matthew K. Olson

Cobra2 15th May 2003 10:01 PM

C605 (R) & C606 (L) = 1uF

Arne K

I'll see if I can scan the schematics later....

Mattyo5 15th May 2003 10:14 PM

ROCK ON! Thanks so much man...yeah, schematics would be GREAT!

-Matthew K. Olson

ojg 15th May 2003 10:40 PM

I own a GFA-2535 and would also like to have the schematic so I can start modding it.
Please, please post it here or e-mail it!

Mattyo5 16th May 2003 07:53 PM

Ok, I replaced the capacitor and everything else seems to be in order. I'm getting about 56v +- from the power supply, but there is a huge amt of DC on the outputs, like 39v Any fast ideas? There is a bias trimpot, but that doesn't help. Thanks!

-Matthew K. Olson

Arzela 17th May 2003 11:25 PM

I once needed to replace parts
in a GFP-750. I called up Adcom; they
were very helpful and told me the part typees and values,

Mattyo5 18th May 2003 12:24 AM

Thanks Azrela, I think I just need to figure this one out on my own, or gut the thing and use it for something else. The power supply still works fine, but 39v on the speaker outputs sounds like the driver's are shorted or the outputs are shot or something like that. If anyone wants to point me in a more exact direction that'd be great. I already have the schematics from COBRA I know what the parts are. Thanks!

-Matthew K. Olson

Cobra2 12th June 2003 03:54 PM

Hi, Mattyo5
Have you sorted the problem?
My best guess is the output-drivers...

Please let us know if / what you find, and if you manage to tweak it...(read somewhere that someone had a trafo-update for it long time ago, probably more VA, and a few volts up...?).

Arne K

Mattyo5 12th June 2003 03:56 PM

I actually sent the amp boards to a guy that i know that repairs such things. I'm not getting charged too much for it either. So he's ontop of things. When I get it back I'll try to post on how it sounds :)

-Matthew K. Olson

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