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Old 4th July 2012, 01:08 AM   #11
m4ick is offline m4ick  United States
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OK, I'm back to where I originally was. I have +-70V and +-15V. I do not have ANY drive signal to ANY outputs.

I confirmed that SW is being driven to ground.

I'm clueless at this point.
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Last edited by m4ick; 4th July 2012 at 01:24 AM.
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Old 4th July 2012, 01:36 AM   #12
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Driving the audio signal into the amp with no outputs, do you have drive signal?
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Old 4th July 2012, 01:45 AM   #13
m4ick is offline m4ick  United States
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No.
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Old 4th July 2012, 01:55 AM   #14
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What's the DC voltage across R175?
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Old 4th July 2012, 02:00 AM   #15
m4ick is offline m4ick  United States
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5.08V
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Old 4th July 2012, 10:06 PM   #16
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That's OK.

Do you see the audio input signal on pin 1 of the driver board?
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Old 4th July 2012, 10:18 PM   #17
m4ick is offline m4ick  United States
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No I do not.

That wouldn't cause the low side outputs to fry would it?
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Old 4th July 2012, 10:36 PM   #18
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No. Is that still a problem? I thought that you found a solder bridge causing that.

Is it still burning the resistor?

Do you have the master/slave switch set to master?
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Old 4th July 2012, 10:40 PM   #19
m4ick is offline m4ick  United States
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Removing the shorted output caused the solder bridge that fried the resistor. Then I replaced q124 and 125 and the resistor. Now no drive signal.

It is set for master.

I assume I need to find out why there is no drive signal first then see what happens when I put the outputs back in.
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Old 4th July 2012, 10:52 PM   #20
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You must have signal on pin 1 before you will have drive signal (outputs out of the circuit). Determine why you have no signal on pin 1 (nearest the op-amp end) of the driver board. There is a generic schematic (just above section 15) to help you follow the signal.
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