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Old 4th January 2011, 06:49 PM   #61
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Location: Louisiana
The 7815 appears to be installed backwards. If so, it's likely been damaged.
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Old 4th January 2011, 07:04 PM   #62
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Replaced it

Leg1:21.38

Leg3: 14.97

7805

Leg1:14.95

Leg3:5.02
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Old 4th January 2011, 07:08 PM   #63
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Location: Louisiana
That looks better.
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Old 4th January 2011, 07:10 PM   #64
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So the problem is likely on the Output driver board? On the middle row of pins at 1 end the pin connects to an ic (U4) and at the other end the pin connects to a diode

Last edited by mike49504; 4th January 2011 at 07:13 PM.
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Old 4th January 2011, 07:20 PM   #65
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There was a problem with the regulator. There may be no other problem.
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Old 4th January 2011, 09:19 PM   #66
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Powerd up the amp and now it has 93 volts of dc on the outputs any ideas?
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Old 4th January 2011, 09:29 PM   #67
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Ok took care of the Dc on the outputs issue. Amp power up and plays audio but it has distorted audio and and hear a squeal through the test speaker. Any ideas?
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Old 4th January 2011, 09:48 PM   #68
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Ok found a problem In the power supply section Resistor R166 is very badly burnt anyone know the value of this?
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Old 4th January 2011, 10:38 PM   #69
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1K

It connects between the secondary ground and the heatsink (when the board is screwed down). There shouldn't be any voltage (AC or DC) on either end of it.
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Old 4th January 2011, 11:21 PM   #70
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Ok reinstalled A1381 and C1027 amp powers up and
produces audio but has squealing through test sub Any ideas?
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