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Old 10th January 2010, 09:23 PM   #11
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With your meter set to AC volts, what is the voltage in the first and second legs of the power supply FETs (they all should be approximately the same).
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Old 10th January 2010, 09:35 PM   #12
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looks like they are all 10volts ac on the first leg and 28volts on the second leg
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Old 10th January 2010, 09:41 PM   #13
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Disconnect the amp from the power source and remove the clamps from the rectifiers. See if any have broken legs. You'll have to pull them away from the heatsink. If they're stuck, push down on the circuit board in front of the rectifiers to see if they'll release from the insulator. Don't try to pry them off of the sink. It's likely to damage the insulator, the rectifier or the heatsink.
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Old 10th January 2010, 10:09 PM   #14
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from what I can see they look fine
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Old 10th January 2010, 10:17 PM   #15
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Did you use the same reference point (black meter probe) when you measured the rail voltage and when you measured the 12v supply voltages?
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Old 10th January 2010, 10:20 PM   #16
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Yea, I used the ground terminal
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Old 10th January 2010, 10:25 PM   #17
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Clamp everything down again (<-- VERY important) and power up the amp.

Measure both the AC and DC voltage on all 3 legs of any one of the 4 rectifiers.

AC voltage
Leg 1:
Leg 2:
Leg 3:


DC voltage
Leg 1:
Leg 2:
Leg 3:
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Old 10th January 2010, 10:47 PM   #18
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So on D731 and D732 the only combo that I got anything on was the center legs. I measured 36v ac

On D631 and D632 I measured 101v ac on the center legs and 36v ac on the outer legs. Nothing DC
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Old 10th January 2010, 11:07 PM   #19
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With the black probe on the outer leg of D731 and the center leg of D632, what's the DC voltage?

With no power applied, measure the resistance from the center leg of all 4 diodes to the heatsink. Do you read anything less than 1000 ohms? If so, what's the resistance?

What about the outer legs to the heatsinK?

You may want to set the meter to DC volts and make sure that there is nothing more than a few volts between the center legs of the rectifiers and the heatsink before measuring the resistance. Touch the probe that's on the heatsink to a place where a screw has cut threads. The coating on the heatsink may not conduct well/consistently.
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Old 10th January 2010, 11:25 PM   #20
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With the black probe on the outer leg of D731 and the center leg of D632, what's the DC voltage?
In this test where would I put red probe? Center of d632? If so didnt measure any voltage, if red probe is on +12 it measures 12-13v

With no power applied, measure the resistance from the center leg of all 4 diodes to the heatsink. Do you read anything less than 1000 ohms? If so, what's the resistance?
All measured as an open circuit

What about the outer legs to the heatsinK?
Same as above

You may want to set the meter to DC volts and make sure that there is nothing more than a few volts between the center legs of the rectifiers and the heatsink before measuring the resistance. Touch the probe that's on the heatsink to a place where a screw has cut threads. The coating on the heatsink may not conduct well/consistently.
All under 1 volt
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