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Old 3rd January 2011, 08:27 AM   #31
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I removed the C1027 and the square wave still doesnt remain constant
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Old 3rd January 2011, 08:32 AM   #32
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The voltages on the A1381 are pulsing also
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Old 3rd January 2011, 08:36 AM   #33
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Remove the A1381.
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Old 3rd January 2011, 08:45 AM   #34
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The square wave is still pulsing with the A1381 and C1027 removed .

Also the voltages on the rectifiers is pulsing
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Old 3rd January 2011, 08:49 AM   #35
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Is the power supply remaining on? Look at the square wave on the drain/tab of the power supply FETs.
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Old 3rd January 2011, 09:14 AM   #36
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In the first pic is leg 1 of the fet 2nd pic is middle leg of fet and the 3rd leg just deflects. Square waves remain constant
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Old 3rd January 2011, 09:55 AM   #37
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OK. That seems to eliminate the protection components on the main board.

On the audio driver board, on the center row of pins, one end pin has 15v. Sso you know that you have the right pin, confirm that it has 15v. On the other end of that row, do you see a pulsing output?
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Old 3rd January 2011, 10:06 AM   #38
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Every pin on the middle row of pins is pulsing voltages
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Old 3rd January 2011, 10:08 AM   #39
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Do you have both positive and negative rail voltage?

Do you have the proper output voltage on all of the regulators? Place the black probe on the 'ground' pin of each regulator when measuring the voltage. The 78xx ground is the center leg. The 79xx ground is the first leg.
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Old 3rd January 2011, 10:15 AM   #40
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7815
1:13.9
3:12.5

7915

2:-.04
3:.-.04
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