Hey, I have an old Rockford 400x4, big 4 channel, when you touch the front and or rear rca's going into the amp, I get a bad crackling through the speakers.... any ideas on what the problem is, and where/how much I am looking at around Vancouver to get it fixed? Thanks.

 

Amp sounded like it was motorboating a bit, too. Making some weird noises. Anyone?

 

Bad transistors. or maybe a bad ground.

Those are a bitch to repair.
RF glued down the devices to the heat sink.
Its hard to get them off...

[ March 28, 2004, 10:05 AM: Message edited by: Seahag ]

 

Thanks for the help guys! Seahag, by bad ground do you mean my ground in the vehicle, or do you mean an internal ground on the amp? Kilowatt, so check continuity from the inner part of the RCA, and touch it to the cicuit board where it appears to make contact? Thanks again......

 

oops. bad ground in the circutry

I have an amp that sounds like a fire thu the speakers. It puffs and snaps.. Kinda like when you start a camp fire.
Haven`t quite figured out what to do with it.

 

Gotcha. Tried the continuity test while wiggling the barrel, doesn't seem to have a short between the barrel and the board. I am going to hook it up again and play around with it. Would using RCA's with the middle wire (Remote) and grounding it at one end help maybe, if there is a bad internal ground?

 

It may not be the problem.

usually the "amp" section of the amp
has to ground to the chassi ground.
There are resistors that hook up between
these to sections. if they go bad, you get noise.

I was just speculating. 99% of the time its a
mosfet transistor.

 

OK cool. Thanks. Probably going to be over the $100 mark to fix, I would guess.... [img]graemlins/cry.gif[/img]

 

yea.. thats if you can find someone.
Its not worth opening up a shop.
I`d take it off your hands.. but I dont want to fix that bitch.

Theres a shop in missisauga that does RF repairs.
they charge I think $180 flat.

Sell it on ebay.