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Old 30th January 2013, 01:32 AM   #21
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Ok... def not have 15v on either L7815 or L7915. I followed pin 14 of the output card to 3rd leg of the L7815.

L7815 has 8.71v on pin 1, 0.002v on pin 2, 7.14v on pin 3 right now

diode check red lead on pin 1 - pins 1-2: OL, Pins 1-3: OL, Pins 2-3: .510
diode check black lead pin 1 - pins 1-2: .551, pins 1-3: .559, Pins 2-3: .920
Defective?

L7915 has 0.001v on pin 1, -9.10v on pin 2, 8.35v on pin 3

diode check red lead on pin 1 - pins 1-2: OL, pins 1-3: .986, pins 2-3: .532
diode check black on pin 1 - pins 1-2: .555, pins 1-3: .522, pins 2-3: OL

Also defective?

Could my supply be the prob? As soon as I connect remote my suppy is going from 12.56 to 8.5v at the power terminals... using the limiter...
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Old 30th January 2013, 02:28 AM   #22
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Post a couple of photos showing all areas of the board.
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Old 30th January 2013, 10:22 AM   #23
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Some pics as requested. lmk if you'd like any others in better quality pic of a certain area.
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Old 30th January 2013, 12:56 PM   #24
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On C53 and C54, is the amplitude of the square wave signal approximately the same on both terminals of each capacitor? What is the amplitude? Post a photo of the waveform if you're not sure.
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Old 30th January 2013, 10:18 PM   #25
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I have +5.17v on C53 + leg, and 0.000v on neg leg & 0.000v on pos leg of the C54 and -5.41v on the neg leg.

Attached is the 4 leg photos and one of my settings.
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File Type: jpg IMG_0390.JPG (823.8 KB, 7 views)
File Type: jpg IMG_0391.JPG (836.0 KB, 3 views)
File Type: jpg IMG_0392.JPG (860.9 KB, 2 views)
File Type: jpg IMG_0393.JPG (929.2 KB, 3 views)
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Old 30th January 2013, 10:22 PM   #26
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Just checking the legs again, I now have 4.95v on + leg of C53 and -5.15v on C54 neg leg. Not sure why its changing... might be my ps dipping a lil.
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Old 31st January 2013, 01:57 AM   #27
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The output from a small winding on T1 drives those capacitors. Are you sure that the power supply FETs driving T1 are being driven properly?

You should see a swing from ground to 2x the B+ voltage on the primary windings of the transformer.
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Old 1st February 2013, 01:20 PM   #28
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No, there doesn't appear to be any swing... if I put the black prob on ground terminal and test any of the transformers I get 12.66 volts on every primary winding (no matter if I touch the pos or ground, theres power on all 3 primary) with the amp off, and drops to 8.2v as soon as I add the remote (through resistor).

The transformer feeding the 15v I get 0.000v if I use ground terminal, and 12.66v (or 8.2v) if I connect black prob to one of the primary windings. If I test black lead on the secondary center and red on the 15v I get 0.000v

Last edited by Deadly Sones; 1st February 2013 at 01:26 PM.
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Old 1st February 2013, 02:31 PM   #29
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Do you see the 24v of swing on the primary windings of the other transformers?

If not, you may have blown FETs for the transformer that has the 15v windings.
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Old 1st February 2013, 02:34 PM   #30
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I have the same readings for all the transformers. Where exactly should I be placing the leads?
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