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GFA 535 right channel out.
GFA 535 right channel out.
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Old 30th January 2008, 03:00 PM   #1
sdstarnes is offline sdstarnes  United States
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Unhappy GFA 535 right channel out.

Looks like the amp in my "budget" system is having problems as the right channel output stage is bad Anyone have a DIY for some basic troubleshooting? Not up on all of the electrical theroy required but can follow directions and possibly replace items if needed..

Thanks!
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Old 30th January 2008, 04:57 PM   #2
ben62670 is offline ben62670  United States
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Did you open it up? Any fuses blown. If fuses are blown replace rail fuses with 1 amps to test. Replace the main with a 5 amp for test reasons. Anything look burnt? Getting hum out of channel?
We need a little info.

Ben
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Old 30th January 2008, 10:27 PM   #3
sdstarnes is offline sdstarnes  United States
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No fuses blown, no hum, nothing looks burnt, just silence on the one channel.....
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Old 2nd February 2008, 02:37 PM   #4
sdstarnes is offline sdstarnes  United States
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The channel was making a high pitch distorted sound right before it cut out........Any ideas?

Thanks!
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Old 3rd February 2008, 12:07 AM   #5
sdstarnes is offline sdstarnes  United States
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I turned the amp back on and the blown channel played for a short time, then started distorting out to a very high pitched sound when is when I shut it off. I am able to duplicate this several times....Possible output transistors???

Anyone?????
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Old 3rd February 2008, 12:15 AM   #6
mpmarino is offline mpmarino  United States
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Do you get the high pitched squealing when no source is
connected?
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Crazy Yankee.
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Old 3rd February 2008, 03:48 AM   #7
sdstarnes is offline sdstarnes  United States
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I believe it does it with or without a source input.......
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Old 4th February 2008, 01:34 AM   #8
vhinze is offline vhinze  United States
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I'll go out on a limb here and say if it was an output transistor blown, it'd probably stay blown and take a fuse or other transistors with it.

I don't have a schematic in front of me and it doesn't sound like you do either. But if you want to poke around, I suggest getting one from one of the many websites that pedal them. Then I'd go looking at the base-emitter junctions of the offending channels driver transistors with no load hooked up to the amp. You wanna see 0.7 volts at the junction. Compare voltages with the good channel to confirm.

That's the best I can do for you "blind".
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Old 4th February 2008, 03:07 AM   #9
sdstarnes is offline sdstarnes  United States
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Thanks!
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