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Old 18th January 2012, 01:12 PM   #1
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Default Planet Audio RXD1400

I got this amp in with all of the power supply fets blown and 3 outputs that were bad..


I replaced the power supply fets and removed all outputs.. Tested for DC on the speaker terminals with all outputs removed i get 0.01 volts ..

So i started putting 2 outputs in at a time.. With 2 outputs in the amp i still get 0.01 volts ...

So i put 2 more outputs in the amp and now i get 40 volts of rail on the output terminals measured directly across the speaker terminals..


Do i need to put all of the outputs in it to see if the DC goes away or do i have another problem ?
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Old 18th January 2012, 11:20 PM   #2
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If you installed both high-side and low-side FETs, it likely has a defective drive circuit.
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Old 20th January 2012, 12:35 PM   #3
Dr Zeus is offline Dr Zeus  United States
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Is this a type-2 Class-D? IRF30n20d outputs? Check the MPSAxx BJTs on th driver board. make sure the fan is working right also.
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Old 20th January 2012, 12:47 PM   #4
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It uses the FB31N20d's For the outputs But the amp has no driverboard and no fan..
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Old 20th January 2012, 04:35 PM   #5
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The driver board is in the black box near the output filter inductors. It's not repairable and, the last time I checked, not available from the manufacturer.
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