Help Rockford 1100a2 - 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 20th May 2010, 03:44 PM   #1
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
Default Help Rockford 1100a2

hi im new in this forum and i need a lil help on a RF 1100a2.. i replaced some IRF9640, IRF640, 0.1 ohm resistor and the LM337 regulator and the amp was playing fine with a lil noise... yestarday i disarm the amp again to check the source of the noise but when i turn on the amp with the current protection on the ground i see some current flowing and the Q5,Q6,Q13 and Q12 transistor are getting hot quickly..

i hope some one could help me on thise one..

PD. i dont have any osc. here just in my job and i will be free for a week
  Reply With Quote
Old 20th May 2010, 04:27 PM   #2
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
recheck....
Q5,Q6,Q12 and Q13 are not shorted and i got 5volts on gates

i don't have any voltage on the Rectifiers U7 and U5.

Last edited by stoke; 20th May 2010 at 04:41 PM.
  Reply With Quote
Old 20th May 2010, 09:29 PM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What is the DC voltage with one probe on the center leg of U7 and the other probe on the center leg of U5?
  Reply With Quote
Old 20th May 2010, 11:03 PM   #4
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
neg probe on U5 and Pos on U7 center legs i got -7 volts
  Reply With Quote
Old 21st May 2010, 12:37 AM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you have 5v on the gates of ALL of the power supply FETs? Check each one.
  Reply With Quote
Old 21st May 2010, 12:09 PM   #6
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
yes
  Reply With Quote
Old 21st May 2010, 07:39 PM   #7
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
Quote:
Originally Posted by stoke View Post
yes
i have 5 volts on all of then
  Reply With Quote
Old 21st May 2010, 08:29 PM   #8
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
That would tend to indicate that the FETs are all OK.

You stated that you had the current protection on ground. Do you mean you had a current limiter connected to the ground terminal of the amp?
  Reply With Quote
Old 22nd May 2010, 01:48 PM   #9
stoke is offline stoke  ominican Republic
diyAudio Member
 
stoke's Avatar
 
Join Date: Mar 2010
yes is a lil trick i learn to stop blowing things when you're testing
  Reply With Quote
Old 22nd May 2010, 07:59 PM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Having the current limiter on ground can cause problems, particularly when you connect a signal source to the amp. Connect it inline with the B+ line instead.

What is the DC voltage measured directly across the B+ and ground terminals on the amp when you have only 7v DC across the two rectifiers?
  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 P300-1 brandes.cm Car Audio 1 19th February 2010 02:56 PM
ROCKFORD a SERIES mjh7096 Car Audio 4 17th January 2010 05:40 AM
help with fosgate 1100a2 amp ben04srt Car Audio 31 23rd March 2009 07:56 PM
Help me with Rockford 500bd valterdaw Car Audio 7 19th May 2007 08:43 PM
Rockfords fosgate 1100a2 output kelving Car Audio 1 12th November 2004 02:54 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 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