Jl audio 500/1 help - 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 25th November 2012, 04:49 PM   #11
diyAudio Member
 
Join Date: Nov 2012
Hey guys on the jl 500/1 rev 10 what's the value for c640? I have nothing there no power or continuity or even resistance.
  Reply With Quote
Old 25th November 2012, 04:52 PM   #12
diyAudio Member
 
Join Date: Nov 2012
I also noticed when the amp is powered the 4 LEDs in te middle of the board are only half lit and they flicker.
  Reply With Quote
Old 25th November 2012, 05:31 PM   #13
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
On a rev3 board that I have here, there is no connection to one terminal of C640. It appears that it was supposed to ground the heatsink but was not used.

The LEDs don't light up under normal operation.
  Reply With Quote
Old 25th November 2012, 06:02 PM   #14
diyAudio Member
 
Join Date: Nov 2012
What makes the LEDs lite?
  Reply With Quote
Old 25th November 2012, 06:11 PM   #15
diyAudio Member
 
Join Date: Nov 2012
Also the driver transistors are those the surface mount? And have 3 legs on one side and one on the other?
  Reply With Quote
Old 25th November 2012, 06:16 PM   #16
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I think they only light up when something isn't right with the amp. They're not indicators, as far as I know, they were likely chosen as diodes with a specific forward voltage to serve as some sort of internal limiter. That's just a guess. I've repaired hundreds of these amps and have never had to be concerned with them.

The power supply drivers are SMD. The drivers for the outputs are a combination of through-hole transistors and one 8-pin SMD driver IC.
  Reply With Quote
Old 25th November 2012, 06:21 PM   #17
diyAudio Member
 
Join Date: Nov 2012
Ok so the 4 power supply drivers on the board close to the neg rail I have power (12v)on the two in the middle but only a couple mV on the outter two is that normal?
  Reply With Quote
Old 25th November 2012, 06:29 PM   #18
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If you have 80v on the speaker terminals, the power supply is functioning normally. The drivers that you need to check are for the output transistors, not the power supply transistors.

Did you replace output transistors or power supply transistors?

What were the part numbers on the original parts and the parts that you used as replacements?
  Reply With Quote
Old 25th November 2012, 06:34 PM   #19
diyAudio Member
 
Join Date: Nov 2012
I replaced all if the components on that clamp onto the heat sink . (4) irf540n and (8) irfz44n and (1) sf1606g then I replaced all the smd gate resistors with 47 ohm
  Reply With Quote
Old 25th November 2012, 06:38 PM   #20
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What is the DC voltage on the positive speaker terminal?

On the negative speaker terminal?

Black probe on amp ground terminal.
  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 S Merlington Car Audio 4 7th September 2012 05:57 AM
JL AUDIO 500.1 mike49504 Car Audio 5 15th April 2012 06:48 AM
JL Audio 500/1 mike49504 Car Audio 59 27th January 2012 04:07 PM
JL Audio 500/1 mike49504 Car Audio 55 23rd September 2011 06:26 AM
jl audio 500/1 megael9 Car Audio 12 29th May 2010 12:01 AM


New To Site? Need Help?

All times are GMT. The time now is 12:45 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