Rockford Fosgate 4.6X

[S Merlington]

Someone has been inside this amp at some point ..

The power supply fets that I found in it were IRFZ44N

Gate resistors are 10 ohm

Power supply drivers are mixed I have 1A'S/2A'S and 1G/2G

The problem I'm having is the power supply fets keep blowing ..

Will the IRFZ44'S work in this amp and if so are the 10 ohm gate resistors fine or do I need to switch the value of them and if so to what ?

Also will the 1A/2A'S work in this amp for the power supply drivers?

 

[Perry Babin]

With good FETs in the power supply and no B+ connected, does the gate drive on the leg (not on the board) of every PS FET look good?

Push on the board near the FETs while watching the signal to see if it changes.

 

[S Merlington]

No ..

On 2 of the fets I get a good square wave and 5 volts on the gate leg

On the other 2 fets I have no gate signal and have 13 volts on gate leg and 0 volts on the other 2 legs

 

[Perry Babin]

Are the drivers in the correct locations (PNP with collector grounded)?

Do you have a good drive signal on the bases of the drivers for the two transistors with no drive signal?

 

[S Merlington]

Ok I found the problem ..

There are broken traces under the drivers ..