Rockford Fosgate P75.2

[chipper]

I want to replace the outputs on my Punch 75.2 only one channel is working but the other side had shorted output mosfets but i removed them from the mesha board. Can i use IRF540N and the IRF9540N?

[Perry Babin]

The IRF540N doesn't work properly in many of the Rockford amps. I recommend the IRF540A. I don't know about the 9540N.

[chipper]

I can use this one, right?

Digi-Key - IRF540ZPBF-ND (Manufacturer - IRF540ZPBF)

And this one too?

Digi-Key - IRF9540NPBF-ND (Manufacturer - IRF9540NPBF)

[Perry Babin]

I can't explain why the N version won't work so I won't say that anything will work that I haven't used.

Arrow has both parts (IRF540A and IRF9540PBF).

[chipper]

How do you post up pictures?

[Perry Babin]

Click the 'go advanced' button below the 'quick reply' field. Then select 'manage attachments' on the new page.

[chipper]

Thanks for the info. Anyways heres the Punch 75.2 that kinda exploded on the output side. Any idea what caused this? It blew out on the P-channel side i used some fets from another dead amp for testing and i pushed it with a 4 ohm subwofer bridged with gains umm i'd say 75 percent and was bumping good but it exploded all of a sudden it blew??. I ordered some new IRF540s and IRF9540 i baught 8 total new fets just in case something were to happen.


EDIT: the burned up holes for the legs of the fets on the P-channel side fet it burned up by itself, how? i don't know?? And when installing new ones could i hard wire the leg of the fet to???? Thanks

[Perry Babin]

The connection likely became intermittent and began arcing. That would have caused the connection to heat up and burn.

You'll have to cut away the burned board, it's likely conductive.

You can hardwire the connections to the drain and source legs. You'll have to clean it up to see exactly where each one connects. The source connects to the resistor. The drain connects to the rail.

[chipper]

Hmmm thats what i fugured, I was using a fairly large tip solder iron when i stuck in those fets. Would it be ideal to replace all four transistors? Or can i use the other two in there still.

[Perry Babin]

There are only two in that channel. If the other channel is working, there's no reason to replace the outputs.