Clarion DPX11500 #2 Repair - 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 17th February 2013, 02:18 PM   #1
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Default Clarion DPX11500 #2 Repair

I was advised to start a new thread for this amp.

I acquired another damaged DPX11500.

First things first, this board is in way better condition than the last... While still not functioning, it became clear that this one was the better choice to concentrate on.

Using a headlight to limit current I tested the amp. It powered up, but when into protect with the protect light blinking rapidly in sets of three.

Research lead me to this possibly being an internal short, I tested the outputs while installed and didn't like the values of one. (much different then the othes) After pulling all the outputs (2SA1294 and 2SC3263) the protect light no longer came on. Tracing back through the circuit i did not find any dead shorts. I haven't tested any ICs. Unfortunately I do not have access to a scope.

With the transistors removed, I had 1.2VDC on the speaker output.

After reinstalling the transistors, (new) I have 1.2VDC (usually falls to .98 or so) on speaker out.

I did a quick audio test, and there is output, however it is distorted; you can tell what is playing but its not usable.

I tested resistors, transistors, and diodes back to some IC's but stopped there. Any idea where I should be focus?
  Reply With Quote
Old 17th February 2013, 02:33 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Which terminals of the defective output transistor were shorted together?
  Reply With Quote
Old 17th February 2013, 05:06 PM   #3
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Sorry, I should have clarified.

Once they were pulled from the board, they all appeared to be ok. I installed new, strictly because I had new ones here. Diode test between pin one and two read 538, as did pins 1 and 3. When I test two and three, i get no reading.

Also, I found out from the previous owner, that when the amp failed it was a sudden failure at turn on, and it pulled the subs all the way in.

I tested the PWM IC, and it appears to be ok. I didn't get any low readings, they were comparable and I mean near identical to the brand new one I installed in a different amp.
  Reply With Quote
Old 19th February 2013, 04:36 PM   #4
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Ok,

I bought a better DMM, since the one I had been using previously. When I do a diode test, or a resistance test, it doesn't seem to hunt anymore for a reading..

I'm still trying to hunt down the source of some DC voltage and distorted output. There were a couple of diodes that were suspect, but after pulling them, they appeared to be ok.

This amp will power on and produce output, rotating any of the pots doesn't make a difference.

I've been advised to replace the gate resistors on the outputs. They appear to test ok, and I'd rather not throw any more parts at the amp without having a solid idea to focus on.

I've been reading the service manual and reviewing diagrams. It is fairly easy to find by googling "DPX11500 service manual"

Any ideas?

Thank you
  Reply With Quote
Old 19th February 2013, 07:39 PM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you have positive and negative regulated voltage on the power supply pins of all of the op-amps?

Do you have both positive and negative rail voltage on the center legs of the output transistors?

What is the DC Voltage on pins 1 and 7 of U2?
  Reply With Quote
Old 19th February 2013, 08:31 PM   #6
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Hi Perry,

I will check. Where should I be grounding to?
  Reply With Quote
Old 19th February 2013, 10:07 PM   #7
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Ok, grounding to the negative terminal block I get:

+25V on each 2A1294 centre pin
-25V on each 2SC3263 centre pin

U2 I get

Pin 1: 9.2VDC
Pin 7: -9.2VDC
  Reply With Quote
Old 19th February 2013, 11:54 PM   #8
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
Sorry, I can I not edit my own posts here?

U2 is an NE5322P
  Reply With Quote
Old 20th February 2013, 03:26 AM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you have audio on R36?
  Reply With Quote
Old 20th February 2013, 03:32 AM   #10
diyAudio Member
 
Join Date: Jan 2013
Location: Chatham
I do not have a scope, will I be able to detect that with my DMM? I have an Extech Dm220.

I get 42mv DC on R36

Last edited by Zeptoplix; 20th February 2013 at 03:41 AM. Reason: Added info
  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
Clarion Dpx11500 repair help Zeptoplix Car Audio 19 15th February 2013 06:58 PM
Clarion DPX11500 Repair Help Zeptoplix Solid State 0 21st January 2013 08:38 PM
Clarion DPX11500, MPS651/751 m4ick Car Audio 3 18th May 2011 10:55 PM
Clarion DPX11500, can't read gate resisitors m4ick Car Audio 2 16th May 2011 01:52 PM
Clarion DPX11500 m4ick Car Audio 1 12th April 2011 03:37 PM


New To Site? Need Help?

All times are GMT. The time now is 10:56 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