JL audio E1400D - 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 24th June 2010, 05:43 AM   #1
diyAudio Member
 
Join Date: Sep 2006
Default JL audio E1400D

I recieved this amp in for repair and the outputs where shorted i replaced all of then Irf540's I put new Irf540N's back in it. I also replaced the 47 and 10 ohm resistors.

Amp powers up But its not producing NEG rail voltage .


Any thoughts on what to check?
  Reply With Quote
Old 24th June 2010, 05:48 AM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Most of the JL class D amps have no negative rail voltage.
  Reply With Quote
Old 24th June 2010, 05:50 AM   #3
diyAudio Member
 
Join Date: Sep 2006
So on the Irf540's 2 of them have 70 volts on the middle legs the other 2 no voltage present on them. Is that normal or is there a problem somewhere?
  Reply With Quote
Old 24th June 2010, 05:53 AM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
One group of parallel outputs should have rail on the center leg. The other group of parallel outputs should have their 3rd leg connected to ground. The 3rd leg of the first group and the center leg of the second group should be at 1/2 of rail.
  Reply With Quote
Old 24th June 2010, 06:01 AM   #5
diyAudio Member
 
Join Date: Sep 2006
Ok with black probe on ground terminal 1 group of outputs 70 volts of rail on middle legs.

Next group of outputs red probe on B+ terminal i have 13.8 volts on 3rd legs


What do i need to check next since i have no output ?

Also dont know if this helps or not but only have the green LED's are lit on the board
  Reply With Quote
Old 24th June 2010, 07:42 AM   #6
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you have 0v DC on all of the speaker terminals (black probe on ground terminal)?

Is the protect LED lit?
  Reply With Quote
Old 24th June 2010, 02:02 PM   #7
diyAudio Member
 
Join Date: Sep 2006
No Dc on any output terminals. Proctection light is not lit.

I noticed the regulators 317 and 337 are getting hot very quicly though
  Reply With Quote
Old 24th June 2010, 02:17 PM   #8
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you see a square wave on any pin of either of the ICs marked HC132 on the driver board?
  Reply With Quote
Old 24th June 2010, 02:32 PM   #9
diyAudio Member
 
Join Date: Sep 2006
any other way to check it? I need a new scope mine was sitting on the shelf and came crashing down and hit the floor now it doesnt work right
  Reply With Quote
Old 24th June 2010, 02:34 PM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I don't know enough about this amp to check it any other way.
  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
jl audio 500/1 megael9 Car Audio 12 28th May 2010 11:01 PM
Jl audio 1000/1 mike49504 Car Audio 1 22nd May 2010 08:21 PM
jl audio nicandjade Swap Meet 0 2nd September 2006 10:35 AM
JL Audio vs Polk Audio xfsrg Car Audio 2 17th October 2004 06:09 AM


New To Site? Need Help?

All times are GMT. The time now is 06:02 PM.


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