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Old 10th December 2012, 06:02 AM   #21
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The voltage on the terminals connected to the rail caps alternate but, under normal operating conditions, they alternate at approximately 80,000Hz.

Although it's possible that one of the transformers was damaged, it's unlikely. You can check continuity between pins to see if one of the windings is open. A more likely fault is a defective driver transistor or an out of tolerance resistor in the drive circuit.
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Old 17th December 2012, 12:32 PM   #22
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Perry,

I have replaced most of the components of both drive circuits. Keep in mind that I have not installed the irfp260n fets yet. I removed the bank that was not getting power. If I diode check the bank that was operating properly I get. The two outer holes on circuit board I get ~.568 and reversed .625 . On the bank that is not powering up I get .928 and reversed it acts as it is charging up kinda quick until I read OL.
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Old 17th December 2012, 06:11 PM   #23
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There are 4 drive circuits (one for each of the 4 banks of output transistors). Are you sure that you're reading across similar drive circuits (the drive circuits are in two different configurations)?
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Old 20th December 2012, 04:13 PM   #24
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Perry,

i have replaced all of the ES2D diodes and AO6 and A56 transistors for the drive circuits. I also replaced the 100, 200, 10, and 0/jumper resistors for the drive circuits. still no luck, i hope was hoping to find a open resistor or shorted transistor somewhere. I am still reading 0.942v on diode check across the two outer holes for one direction and then reversing the leads to quickly watch the reading increase until it reads OL. I have printer here at work large enough to print out a 2ftx3ft schematic so i can notate the readings. could there be a short or fault outside the driver circuit in parallel giving the false readings i am getting?
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Old 20th December 2012, 04:22 PM   #25
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Of the 4 drive circuits, how many are reading this way?
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Old 20th December 2012, 07:57 PM   #26
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2 drive circuits or (10 FETS soldering positions)
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Old 20th December 2012, 07:58 PM   #27
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If identical drive circuits are giving the same types of readings and one of them was never damaged by blown FETs, I'd assume that the circuit was OK.

Do you have all output FETs out of the circuit right now?
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Old 20th December 2012, 09:01 PM   #28
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All of the FETS are removed from the PCB board. shouldn't all the output positions read for the 4 banks read identical? or do you think since they are constantly switching on/of that 2 banks will read differently?

Originally, i replaced the blown FETS and the unit would power and play sound but would distort when cranked up. So measured power to the FETS and discovered ~110 on 2 banks and about ~8-10 on the remaining banks.
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Old 20th December 2012, 09:07 PM   #29
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The drive circuits are not identical. There are two of each type.
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Old 20th December 2012, 09:22 PM   #30
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okay maybe i chasing my tail.... i will install the FETS with the MESHA boards and go from there.. let you know how it goes...
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