Jbl Amp Not Working - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 7th April 2005, 04:22 AM   #1
bowdown is offline bowdown  Australia
diyAudio Member
 
Join Date: Feb 2004
Location: Perth
Default Jbl Amp Not Working

Hi there i was wandering if someone can help me with a problem i have with a JBL DA1002 car amp.

The amp does not turn on, but the "on" light glows really dull on and then off then on again, just keeps doing that. I have checked for broken tracks and also checked all output and powersupply fets. I also replaced a tl494c ic and still the same. Please help with any suggestions.

Regards

Bowdown
  Reply With Quote
Old 8th April 2005, 12:44 AM   #2
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Bowdown,
Well that tells me the amp is trying to start but protection is shutting it down. Try to power the amp stages up partially with an external bipolar supply and troubleshoot from there. You may find high current draw or DC offset.

-Chris
  Reply With Quote
Old 8th April 2005, 12:58 AM   #3
Banned
 
Join Date: Mar 2005
Location: Australia
basicly the power supply has sense lines on the amplifier side, any variations
in these could have caused the shutdown,then go back and troubleshoot the
power supply,simply changing the ps control chip doesnt mean the power supply
has been looked at properly, smps are harder to fix than linear ones due to
their complexity
  Reply With Quote
Old 8th April 2005, 01:23 AM   #4
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Ahhh, but zat is why I suggested powering the amp section by itself. If you know that's working you don't have to chase through protection.

-Chris
  Reply With Quote
Old 8th April 2005, 01:29 AM   #5
Banned
 
Join Date: Mar 2005
Location: Australia
have no problem with that
  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
Amp non working covik Solid State 0 12th November 2006 09:12 PM
WTB Krell KSA Mk2- working or non working Jozua Swap Meet 0 20th March 2006 12:14 PM
sub amp not working felzi Chip Amps 0 28th July 2005 06:29 AM
p3a not working, help! benmanf Solid State 9 27th May 2005 02:02 PM


New To Site? Need Help?

All times are GMT. The time now is 05:49 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