Rockford Fosgate Power 650

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RockfordFIx

Member
2012-12-03 11:56 am
Yes I did purchase the burnt one off ebay. Unfortunately, the board has a bad burn spot where three resistors caught fire and the traces will be hard to make out without a pic. This will be a challenge though. The seller did not pack amp well and the fan mount and fanblade are broke. The two xover pots have came a part but I can fix them. Someone solder in 15amp automotive blade fuses.
 
I dont currently have one apart. They are a pain to disassemble to take pics. If I have time this week I will try and get some photos for you.

I was going to bid, but it just looked like to much work, more than I wanted to do....LOL

You can buy a square fan from radio shack, hold it up to the grill where the original mounted and drill small pilot holes into the square fan. Then screw the original screws into the pilot holes with some loctite or equivalent on the threads.

Your done with the fan.
 

RockfordFIx

Member
2012-12-03 11:56 am
here are the pics of the board and fan. sorry for the delay..
 

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RockfordFIx

Member
2012-12-03 11:56 am
Perry,

what is your process for repairing circuit boards that are burnt or have a hole burnt through it?

Do you try and epoxy it and re-drill the pre-existing holes for the resistors and diodes. Do run jumper wires where the traces are gone. Or can you buy copper traces that can be placed in the epoxy before it dries? Just wondering if you had to got to that extreme before.
 
I guess it depends on the owner. I have used epoxy type material to fill the holes after removing all of the carbonized material. I've also just run jumpers over the holes (again, after removing all of the carbonized material).

You can't really use normal epoxy if you're ever going to heat it. Well... you can but the mercaptan makes it extremely unpleasant. JB Weld works much better but dries slowly. You won't be able to do anything with it for about 15-20 hours.

If you want the top of the board to have a smooth surface (where it's filled), apply packing tape over the hole and fill the hole from the other side. Sometimes, you have to apply it all around the edges before taping and filling from the other side to ensure that you get a good bond to the perimeter of the hole.
 

RockfordFIx

Member
2012-12-03 11:56 am
Perry or sean,

Do either of you have pics of the bottom..this amp is definitely labor intensive. Looks like the person who worked on htis used silcone chaulk instead of heatsink grease.
 

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RockfordFIx

Member
2012-12-03 11:56 am
perry or sean,

Is it okay to use irf540 for the n ch's and 9540 for the p ch's? Can i also use IRF3205 for the powersupply mosfets? i cleaned the board and removed a lot of the components to gain access to the burned areas. i reflowed the surface of the burned traces. i have a good idea for the top of the board but a little concerned about a few areas. Sean if you have a pic of the bottom of the board that would be awesome. going to orders some resistors today and some d41 and d40's. i will post a pic of the cleaned board later this after
 

RockfordFIx

Member
2012-12-03 11:56 am
perry or sean,

Is it okay to use irf540 for the n ch's and 9540 for the p ch's? Can i also use IRF3205 for the powersupply mosfets? i cleaned the board and removed a lot of the components to gain access to the burned areas. i reflowed the surface of the burned traces. i have a good idea for the top of the board but a little concerned about a few areas. Sean if you have a pic of the bottom of the board that would be awesome. going to orders some resistors today and some d41 and d40's. i will post a pic of the cleaned board later this after
 
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