JL AUDIO 250/1 - Page 2 - 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 27th September 2012, 10:38 PM   #11
diyAudio Member
 
Join Date: Jun 2012
Setting the signal sensing switch to off doesnt make a difference..

If i remove 2 outputs -- Q404 and Q407 the amp will not draw excessive current..


With the 2 outputs still in the amp If i hook just power and gound up the amp will still draw about 1 amp of current..
  Reply With Quote
Old 28th September 2012, 12:20 AM   #12
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
When you make/break the remote connection, does the power supply produce pulses and then stop producing pulses?

Do you get rail voltage when the amp is drawing 1 amp?
  Reply With Quote
Old 28th September 2012, 01:46 AM   #13
diyAudio Member
 
Join Date: Jun 2012
When you make/break the remote connection, does the power supply produce pulses and then stop producing pulses?

Yes



Do you get rail voltage when the amp is drawing 1 amp?

Yes i get 60 amps of rail voltage on the outputs with just power and ground hooked up
  Reply With Quote
Old 28th September 2012, 02:14 AM   #14
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Confirm that all gate drive signals are identical then post a scope cap of the drive signal at the gate leg of one power supply FET.
  Reply With Quote
Old 28th September 2012, 03:00 AM   #15
diyAudio Member
 
Join Date: Jun 2012
Still waiting for my phone to upload the pic to my email ..

The gate signal dont look good
  Reply With Quote
Old 28th September 2012, 03:11 AM   #16
diyAudio Member
 
Join Date: Jun 2012
Heres the pic of the gate signal hope the pic is big enough

Scope set to 2 us .5 volts/div
Attached Images
File Type: jpg IMG_9275.jpg (91.3 KB, 42 views)
  Reply With Quote
Old 28th September 2012, 03:18 AM   #17
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Without the scope settings, it's difficult to tell. Please read the 'Best Initial Settings:' sections on the oscilloscope page of the site.

Try this, set the DC supply voltage lower. You want the drive to go to the full duty cycle. Does the current draw increase?
  Reply With Quote
Old 28th September 2012, 04:48 AM   #18
diyAudio Member
 
Join Date: Jun 2012
Is there anything i can stick in the B+ wire to drop the voltage since I cannot adjuust the voltage on the power supply?
  Reply With Quote
Old 28th September 2012, 05:32 AM   #19
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
A resistor but it's not a good choice because the voltage drop will depend on the current draw.

What are you using for a power supply?
  Reply With Quote
Old 28th September 2012, 04:58 PM   #20
diyAudio Member
 
Join Date: Jun 2012
I lowerd the voltage going to the amp and it doesnt draw excessive current..


With the voltage lowerd here what i get on all of the gate legs for the power supply fets..

Scope setting are 2volts div 10 us
Attached Images
File Type: jpg JL Audio.jpg (163.8 KB, 34 views)
  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 250/1 repair KSpainhour Car Audio 9 24th August 2011 03:01 AM
Help repairing JL Audio 250/1 Jimmy D. Car Audio 9 14th August 2011 10:03 PM
Jl audio 250/1 mike49504 Car Audio 10 21st May 2010 02:51 AM
JL Audio 250/1 HF no output RJCRAFTS Car Audio 3 7th June 2008 05:43 AM
JL AUDIO 250/1 idle current Pioneer621 Car Audio 2 24th April 2008 11:31 PM


New To Site? Need Help?

All times are GMT. The time now is 06:58 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