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Old 9th September 2012, 04:45 AM   #41
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If the drive circuit is producing a clean square wave, it's likely something beyond the driver board. Since this test uses a low frequency signal for testing, it's not definitive because the driver IC could be OK at low frequencies but not at the higher frequencies that are involved with the normal operation of the class D amp circuit.

To test the drive at higher frequencies, you'd have to inject a higher frequency signal into the 2113 but I've never had to do it on this board.

It's also possible that the circuit producing the high-side drive circuit supply voltage isn't working but that's not likely.

It's possible that there are leaky or weak drivers. To test them in the circuit, you'd have to find a way to break the connection to the output gate resistors so that they wouldn't not be driven. Then test as you did previously. Loading them with a 470-1k ohm resistor would make it more obvious if one was defective.
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Old 10th December 2012, 02:31 AM   #42
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Just to bring closure to this thread.

RA1 was open, a 2.2ohm resistor in the feedback loop. The amp would idle fine with no signal, once applied the amp would produce audio for a split second and current would spike. It would continue this cycle until the audio signal was removed.
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Old 11th April 2013, 01:19 AM   #43
highele is offline highele  ominican Republic
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Dear friend
i need to quotation
DML4000 50PSC

THANKS
David
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