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Old 10th June 2008, 03:39 AM   #1
trluser is offline trluser  United States
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Default Request for Adcom GFA-555 MkII schematics

Hi,

My Adcom GFA-555 MkII is blowing supply fuses on the L channel. I found some GFA-555 schematics here but they don't match what I found on the actual PCB. Even the reference part numbers are wrong.
Adcom has also used their own part numbers on the devices making it even harder.

Can someone kindly share a GFA-555 MkII schematic and parts list if they have one?

Thank you in advance.
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Old 10th June 2008, 04:24 AM   #2
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Old 18th June 2008, 09:03 PM   #3
trluser is offline trluser  United States
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Default Not MkII

Thank you for the link.

Unfortunately, they only have Adcom GFA555 and not the MkII.

The schematic and the parts designators (Qxxx) do not even match.

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Old 18th June 2008, 10:44 PM   #4
GEirin is offline GEirin  Argentina
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Hi trluser.

Input power amplifier.

GEirin
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File Type: jpg adcom-555 mkii input power.jpg (74.3 KB, 468 views)
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Old 18th June 2008, 11:25 PM   #5
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I e-mailed tech support at Adcom and they sent me a PDF within a day or so. It was good service
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Old 19th June 2008, 07:21 AM   #6
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Originally posted by xtaltech
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Old 4th October 2008, 08:17 AM   #7
BLOWN is offline BLOWN  United States
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Default Re: Request for Adcom GFA-555 MkII schematics

Quote:
Originally posted by trluser
Hi,

My Adcom GFA-555 MkII is blowing supply fuses on the L channel. I found some GFA-555 schematics here but they don't match what I found on the actual PCB. Even the reference part numbers are wrong.
Adcom has also used their own part numbers on the devices making it even harder.

Can someone kindly share a GFA-555 MkII schematic and parts list if they have one?

Thank you in advance.

Did you ever find the parts list?
I have a bad amp as well and suspect the input side.
Of the schematics I have seen, they were too small to read.

Can someone tell me what values correspond to the numbers on the input board capacitors?



One listing says C101 and C151. THey look like big pink square blocks. I have never seen a capacitor that was a pink square.
The do not measure like most capacitors. They both have a fixed resistance of around 1000k ohms, they don't change value on my multimeter diode setting. What does that mean? IS this really a resistor?
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Old 31st December 2010, 06:12 AM   #8
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C101/151 are 1uf@100v. They are not your problem and do NOT change them unless they are shorted and I am sure they are not. They are Polycarbonate,very high quality and not easy to find. I assume from your post (big pink square blocks) you do not have much experience with electronics. I would suggest you take your amp to a good repair shop for an estamate. I am not trying to be rude but it dose not take much to turn a simple repair into a very expensive one. Do you have a working scope. function generator and DVOM? the basic equiptment?

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