Planet Audio RXD1400

[mike49504]

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 ?

[Perry Babin]

If you installed both high-side and low-side FETs, it likely has a defective drive circuit.

[Dr Zeus]

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.

[mike49504]

It uses the FB31N20d's For the outputs But the amp has no driverboard and no fan..

[Perry Babin]

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.