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Old 11th October 2012, 07:35 AM   #21
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Connect only 1 of the red wires at a time to see if you can determine which half of the amp is causing the current draw.
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Old 11th October 2012, 08:41 PM   #22
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I did, same side that wasn't working before.
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Old 12th October 2012, 10:46 AM   #23
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You stated that the amp was drawing 15 amp from the power supply. Does the other half of the amp work properly (no excessive current draw)?

You stated that the amp was drawing 15 amps of current. Does the defective side draw 15 amps when it's connected by itself?

You stated that there was no voltage on the transformer. Was it drawing excessive current when you measured the voltage?

Where, on the transformer, did you place your probe?
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Old 15th October 2012, 10:22 PM   #24
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The right half of the amp does work correctly, no excessive current draw and it passes through a sine wave perfectly.

The defective side by itself does draw excessive current. Note that the 15A is just past on the current control setting of my power supply.

It was drawing excessive current when I measured voltage to the transformer. I would test one point at a time and leave the amp running for <5sec each point. When measuring from the input center tap of the transformer, I saw voltage on the top side, but not the bottom.
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Old 16th October 2012, 08:58 AM   #25
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I think that you're going to have to post a photo showing where the probes were when you measured the DC voltage on the transformer.
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Old 16th October 2012, 09:52 PM   #26
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In picture 147 I measured ~5VAC. In picture 205 I measured ~0. I am not sure how the transformer is wired so I do not know if this information is valid.

Note that the power supply was current controlled so it was only operating from ~5VDC.
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File Type: jpg 20121016_173147.jpg (621.6 KB, 39 views)
File Type: jpg 20121016_173205.jpg (720.4 KB, 37 views)
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Old 17th October 2012, 08:39 AM   #27
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This isn't a normal test.

Which of the transistors are getting hot when it's drawing enough current to drag the 12v supply down to 5v?
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Old 17th October 2012, 11:18 PM   #28
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In the picture attached, the top right 8 TO-220's all get hot. On the bottom, the second through sixth from the right all get hot.
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File Type: jpg 20121017_184557.jpg (1.01 MB, 26 views)
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Old 18th October 2012, 04:50 PM   #29
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That would seem to indicate that one of the top-left 3 is shorted.
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Old 21st October 2012, 07:37 PM   #30
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I found 1 of the three shorted. I went ahead and removed all three and am noticing a short between where the collector and emitter pins would go. I made sure my output wires are not touching and am not sure what else in this part of the circuit would be causing the short; I did make sure there aren't any solder bridges.
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