rockford fosgate p4004 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th January 2010, 05:20 PM   #1
diyAudio Member
 
Join Date: Sep 2006
Default rockford fosgate p4004

Im working on this amp and 2 of the outputs are toasted they are FQA28N15
Wondering if i can cross this to a different part no or do i need the orginal?
  Reply With Quote
Old 15th January 2010, 11:38 PM   #2
diyAudio Member
 
Join Date: Mar 2007
I have no idea if somebody makes anything else compatible. Perry should know, I can tell you that the part is rated at 28 amps and 150 volts. It is an N channel device. The other half of the channel uses 36P15s. 36 amps, positive channel, 150 volts.
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 16th January 2010, 01:32 AM   #3
Dimon74 is offline Dimon74  United States
diyAudio Member
 
Join Date: Feb 2008
If you can find, use FQA46N15 .They are working perfect in these Punch series
  Reply With Quote
Old 16th January 2010, 03:52 AM   #4
diyAudio Member
 
Join Date: Jan 2010
Goto Mouser.com and you will find them for $1.95Ea. Also, I would not use any substitutes, especially when the original parts are available and easily obtained. This will insure that all channels are operating identically. I have never had much sucess using any substitutes, NTE, ECG, etc. Therefore I discontinued even attempting to do so many years ago. Also, if I remeber correctly, these transistors are soldered to the intermediate heatsink board. This is tricky to remove and reinstall them, but it can be done. If all else becomes too difficult, note the location numbers of at least one of the transistors and purchase the pair as a whole assembly from Rockfords parts dept. at 800-366-2349. Hope this helps......V
  Reply With Quote
Old 18th January 2010, 06:27 PM   #5
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Just a helpful hint when removing these from the mesha strip, watch the surface mount transistor and 3 pin header on the board. It will float off the pads when you are heating up the fet.
I have been using those black binder clips for heat sinks, used to hold papers together. I clip a couple of those on the mesha strip to keep heat away from everything else. Those also work great for the older model mesha as well, clip the other fets next to the one you are heating.

cory
  Reply With Quote
Old 18th January 2010, 07:46 PM   #6
diyAudio Member
 
Join Date: Jan 2009
Location: Iowa
I have repaired 2 of those, and as Professor V said, just go with the originals. All 4 channels will be identical. I have however used substitute rectifiers on the board. To remove the MEHSA strip on that amp, I found a small hotplate to work great. Much easier on that amp than the amps with ALL of the transistors on the same MEHSA strip.
  Reply With Quote
Old 18th January 2010, 08:39 PM   #7
diyAudio Member
 
Join Date: Sep 2006
Ive repaired plently of theese amp among others. Ive found that replacing the fets and outputs on theese amps no problem and pretty easy to do. I went with the orginals every time i repaired them. Just thought this time i might be able to sub the part out to something else to get this kid who owns the amp off my back since he calls me 100 times a day and i have to order the parts and have 100 amps in front of his to fix

Last edited by mike49504; 18th January 2010 at 08:40 PM. Reason: mis spelled
  Reply With Quote
Old 27th January 2010, 04:27 PM   #8
diyAudio Member
 
Join Date: Sep 2006
Ok i put new outputs in the channel that was shorted with the same part numbers. Also replaced the a56 and a06 in that channel. with the new outputs in the amp it draws excessive current. Wondering where i go from here? I also checked the emmitter resistors they test fine also
  Reply With Quote
Old 27th January 2010, 08:02 PM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Did you turn the bias pot fully counter-clockwise to eliminate biasing as the problem??
  Reply With Quote
Old 28th January 2010, 12:45 AM   #10
diyAudio Member
 
Join Date: Sep 2006
Yes turned it fully counter clockwise. As soon as i try to power it up the outputs in that channel get hot almost instantly
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
rockford fosgate p4004 mike49504 Car Audio 3 7th December 2009 09:30 PM
Rockford Fosgate T20001bd Triden312 Class D 3 22nd November 2009 10:54 PM
Rockford P4004 Terminal blocks brandes.cm Car Audio 6 15th November 2009 04:35 AM
About rockford fosgate 1500bd RICKY01AGUAS Car Audio 19 28th June 2009 12:28 AM


New To Site? Need Help?

All times are GMT. The time now is 06:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2