Powerbass xa3000/DLM4000 driver - 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 24th June 2012, 05:48 PM   #11
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
The current spikes before it trips. If I let it idle with a small input signal the current slowly climbs, then it spikes and goes into protect.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 24th June 2012, 06:24 PM   #12
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Does one group of FETs get hot when this happens?

Is it possibly shutting down because the voltage at the B+ terminals drops as the current increases?
  Reply With Quote
Old 24th June 2012, 06:49 PM   #13
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
No outputs get hot, the supply doesn't dip.

I don't see the square wave any more on the outputs.

I'm thinking a gnd issue, maybe.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 24th June 2012, 06:51 PM   #14
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
This has dual TL494 ic's, apparently one for each supply.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 24th June 2012, 07:01 PM   #15
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
The "SPT" line is going high during protect, not sure what that stands for.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 24th June 2012, 07:04 PM   #16
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
One is for the rail supply and the other for the low voltage supply. The two larger transformers have only a single secondary winding. They work together to act as one transformer.

If the outputs aren't getting hot, the problem is likely in the power supply but I don't know of anything that would cause the amp to go into protect due to a problem in the power supply.

The transformers in these amps have a problem shorting where the terminal windings rub on the other windings. Move the secondary terminal windings to see if it makes a difference.
  Reply With Quote
Old 24th June 2012, 11:34 PM   #17
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
If I measure resistance from signal gnd to rectifier gnd, reads 0.2 ohms. Read from speaker neg to rectifier gnd, reads .25 ohms. The only time I see a high frequency square wave is when I reference rectifier gnd. It measures ~25Khz, is my scope playing tricks?

I lifted the diode that was causing the protect.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 25th June 2012, 12:13 AM   #18
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
So the high side fets have a square wave on the gate, really faint. The low side I see no activity and the fets stay cool. The current will spike every 10 seconds like its trying to output.

I replaced the IR2110 on the driver board and put the diode back in place. It no longer goes into protect.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 25th June 2012, 12:35 AM   #19
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Rectifier ground = secondary ground?

What's the resistance between the secondary ground and the primary ground (no RCAs plugged in)?
  Reply With Quote
Old 25th June 2012, 12:43 AM   #20
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
985 ohms
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  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
Powerbass ASA1500.1Dx brandes.cm Car Audio 19 11th May 2012 03:48 AM
DLM4000 class D driver board pergo Car Audio 20 6th March 2012 08:35 AM
Powerbass ASA1500.1Dx Dr Zeus Car Audio 11 26th November 2011 11:43 AM
PowerBass ASA-600.4 audiobahnkid592 Car Audio 3 19th May 2010 09:12 PM
Powerbass thunderlaxton32 Car Audio 1 27th September 2007 01:26 PM


New To Site? Need Help?

All times are GMT. The time now is 08:05 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