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Old 27th December 2012, 07:32 PM   #11
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Does it at any time produce pulses on the gates or drains of the power supply FETs?
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Old 30th December 2012, 09:33 AM   #12
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The drains remain at supply voltage, the gates have about 0.356 vdc on them.

I didnt notice any pulsing.
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Old 30th December 2012, 09:46 AM   #13
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Post the DC voltage on all pins of IC602.
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Old 3rd January 2013, 04:00 AM   #14
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Im sorry Perry I dont find an IC602 on the board?

Is it on the bottom side of the board?

I see an IC206 but its on the output side of the board and I have the 6 pin wire unplugged still?
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Old 3rd January 2013, 04:07 AM   #15
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Yes. It's on the bottom of the board. It's one of the 494s.
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Old 3rd January 2013, 04:17 AM   #16
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Will it be safe to power the amp out of the sink disconnected from the output board upside down?
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Old 3rd January 2013, 04:29 AM   #17
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I see 2 494's one says IC601 and one says IC605.

Shall I take readings from both?

Do I use the battery terminal or direct battery terminal or both when powering this amp?

When I power the amp its like it starts to power up drawing a few amps of current then drops to nothing on the meter of my supply.
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Old 3rd January 2013, 04:50 AM   #18
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You can use either terminal.

The IC602 is printed mirror image, if you look closely.
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Old 3rd January 2013, 04:53 AM   #19
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IC601

1: 0.967
2: 0.963
3: 3.850
4: 0.221
5: 1.668
6: 1.670
7: 0.004
8: 14.53
9: 0.410
10: 0.427
11: 14.53
12: 14.53
13: 5.05
14: 5.05
15: 5.05
16: 0.004

IC605

1: 0.954
2: 0.952
3: 3.873
4: 0.220
5: 1.674
6: 3.762
7: 0.004
8: 14.53
9: 0.433
10: 0.428
11: 14.53
12: 14.53
13: 5.05
14: 5.05
15: 5.05
16: 0.003
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Old 3rd January 2013, 05:01 AM   #20
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Reduce the supply voltage to about 13.5v. Does that help?
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