Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

crossfire 600.1
crossfire 600.1
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 August 2019, 05:36 PM   #1
Bills amps is offline Bills amps  United States
diyAudio Member
 
Join Date: Mar 2014
Default crossfire 600.1

I have a amp that is protecting on any speaker load, 4, 2, but will not protect on a 1ohm dummy load. input current is low on all speaker loads. typically under 6amps. But on dummy load i can max out my bench supply at 10amps. Input signal is tone at 60hz and scoping the speaker output is always perfect sign wave, no clipping. I first thought that it was overcurrent or DC offset on the power supply. Pos rail is 58v and neg rail is -58. i also bypassed the over current shunts just to see if that was the case, nope. So i tested again to see which pin on the 494 was going high and it was pin 1. So i am open to what circuit is on pin one
Attached Images
File Type: jpg 20190824_122939.jpg (910.9 KB, 64 views)
File Type: jpg 20190824_122947.jpg (796.0 KB, 62 views)
File Type: jpg 20190824_122956.jpg (1.03 MB, 60 views)
  Reply With Quote
Old 24th August 2019, 05:42 PM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The shunts have such a low value, it's difficult to short them and make a difference.

I can't tell which driver board you have for audio. Can you post a photo from a better angle?

Pin 1 is driven from 2 op-amps/comparators and take signal from various circuits.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 24th August 2019, 09:38 PM   #3
twilliar is offline twilliar  United States
diyAudio Member
 
Join Date: Aug 2019
Location: Washington
The audio driver board is your generic type 3 board where you jump 2 and 3 on the 21844 for shutdown in Perry's tutorial.
Those are the same boards (power and audio) as the Maxxsonics PZX class D amps if you have dealt with them. They can be picky.
Is that 6 amps at idle?
Is your dummy load wire wound?
  Reply With Quote
Old 25th August 2019, 01:29 AM   #4
Bills amps is offline Bills amps  United States
diyAudio Member
 
Join Date: Mar 2014
The idle amps is 1.2amp. es the dummy load is wire wound just like a speaker would be but without the motor. I need the driver board to operate so i can put the amp under load.
  Reply With Quote
Old 25th August 2019, 03:17 AM   #5
twilliar is offline twilliar  United States
diyAudio Member
 
Join Date: Aug 2019
Location: Washington
That's odd that speakers will trip it but not a wire wound load. Not to sound too far out but you are sure that the speaker voice coils are not shorted to the motor?
  Reply With Quote
Old 25th August 2019, 02:54 PM   #6
Bills amps is offline Bills amps  United States
diyAudio Member
 
Join Date: Mar 2014
Quote:
Originally Posted by twilliar View Post
That's odd that speakers will trip it but not a wire wound load. Not to sound too far out but you are sure that the speaker voice coils are not shorted to the motor?
yes sir. changed woofers. just because of different ohm load. one was dual 4 and the other was dual 2. was thinking that was over current so we went to dual 4 which was 2 ohm final.
  Reply With Quote
Old 1st September 2019, 06:34 PM   #7
Bills amps is offline Bills amps  United States
diyAudio Member
 
Join Date: Mar 2014
Here are the cards. Not sure i have ever seen a power supply driver card like this one. And the copper heat sink on the audio drive card is a thumbs up in my book. I know those chips get hot
Attached Images
File Type: jpg 20190901_112200.jpg (960.0 KB, 39 views)
File Type: jpg 20190901_112246.jpg (996.1 KB, 37 views)
File Type: jpg 20190901_104801.jpg (988.3 KB, 25 views)
File Type: jpg 20190901_112231.jpg (963.2 KB, 22 views)
  Reply With Quote
Old 1st September 2019, 06:47 PM   #8
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The over-current protection threshold is typically set by a low value resistor (possibly R5). It's generally in series with a 10k resistor (maybe 5.1k here). If the threshold is too low, that could cause it to go into protect early but it should do it on all types of loads. Reactive loads like speakers could cause an irregular type of pulse compared to a dummy load.

The 10k?/270 divider generally drives a 100k resistor and a non-inverting input on the comparator. On that comparator input, there is typically a capacitor that connects to pin 4 of the comparator. That capacitor may be out of tolerance.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 1st September 2019, 08:03 PM   #9
Bills amps is offline Bills amps  United States
diyAudio Member
 
Join Date: Mar 2014
on which board Perry?
  Reply With Quote
Old 1st September 2019, 08:18 PM   #10
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The audio board.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote

Reply


crossfire 600.1Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with Crossfire XS-4K twinimage Car Audio 1 14th May 2019 10:52 PM
Crossfire TEK 150.2 S Merlington Car Audio 10 7th January 2014 12:35 PM
Crossfire 360 Help Tom Da Tech Car Audio 0 18th March 2012 03:35 AM
Crossfire C3 704 MarKart Solid State 0 24th January 2012 04:43 PM
Crossfire amp help please cfa-602 joesch1999 Car Audio 111 26th April 2011 02:56 AM


New To Site? Need Help?

All times are GMT. The time now is 06:02 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki