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Old 29th January 2013, 07:54 PM   #11
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It is turning on everytime without clicking back off now, no protection lights, but no oscillation and 60v dc on output terminals. It pulling about 3.0amps with the limiter in place

Last edited by Deadly Sones; 29th January 2013 at 07:56 PM.
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Old 29th January 2013, 07:55 PM   #12
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What happened to the 40v of DC on the speaker terminals? That should have deflected the trace by nearly 1 full division.
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Old 29th January 2013, 07:58 PM   #13
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thats what I meant... 60vdc in the speaker terminals... it might have been that high from the start

Last edited by Deadly Sones; 29th January 2013 at 08:07 PM.
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Old 29th January 2013, 08:04 PM   #14
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First pic is reading with prob on center leg of output transistor.

Second pic is reading with prob on 3rd leg

Third pic is probe on + speaker termial

4th pick is with probe on - speaker terminal
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Old 29th January 2013, 08:08 PM   #15
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I have to go grab my son... I'll be back soon, thanks as always Perry.
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Old 29th January 2013, 08:18 PM   #16
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Which audio driver board is this amp using?
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Old 29th January 2013, 08:19 PM   #17
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DMW3640NHV-v30
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Old 29th January 2013, 08:22 PM   #18
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If you've confirmed that all outputs are OK and none have broken legs, post the DC voltage on all terminals of the driver board. Place the black probe on the negative speaker terminal.
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Old 29th January 2013, 09:38 PM   #19
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I don't see any broken legs and they all test OK in the circuit. I haven't removed them to test... there are no shorts and they all pretty much read the same.

I have the following voltages on the output driver card pins.

1: -60v
2: -60v
3: -64v
4: -54.6v
5: -63.7v
6: -63.1
7: -63.5
8: 1.335
9: 5.03
10: -5.31
11: 0.000
12: -5.10
13: 5.0
14: 7.267
15: -63.5
16: -63.1
17: -63.5
18: -54.4
19: -63.6
20: -60.1
21: -60.2

Should I pull it out of the case and remove the outputs and test out of the circuit?

Last edited by Deadly Sones; 29th January 2013 at 09:41 PM.
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Old 29th January 2013, 11:22 PM   #20
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I think pin 14 should be at 15v. Check the regulator feeding it.
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