Sundown SAZ-1500 excessive current draw - 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 29th July 2012, 03:10 PM   #1
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Default Sundown SAZ-1500 excessive current draw

Originally the amp had failed supply and output fets. Supply is operational, output fets replaced, gate resistors verified. On power up amp with draw excessive current and it climbs with B+ voltage increase.

I can get the amp to stay out of protect by lifting D13 and using a current limit resistor. The outputs are IRF640N/IRF9640 pairs, essentially the AQ2200 schematic, same driver board with 4 transistors to drive the fets. The gate signal is roughly 40Khz on either rail. I only see a 5V square wave though, that seems to be my issue.

Thoughts,

Click the image to open in full size.

IRF640N gate signal, gnd is two divisions above center.
Click the image to open in full size.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 29th July 2012, 03:31 PM   #2
timwebb is offline timwebb  United States
diyAudio Member
 
Join Date: Jan 2010
Location: memphis tn
ive have those output drive transistors to fail very easy. ive have plenty that tested good but were defective.
  Reply With Quote
Old 29th July 2012, 05:00 PM   #3
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Note: 1)These amps do not like bringing the supply voltage up slowly, gets caught in some unknown region and causes excessive current.
2) The nomenclature on the board is wrong for the rca inputs, what says "out" is in.
3) Output section resembles AQ2200 and a host of Hifonics etc boards that use DWM1216 card.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 29th July 2012, 05:25 PM   #4
timwebb is offline timwebb  United States
diyAudio Member
 
Join Date: Jan 2010
Location: memphis tn
are the output fets in, in the second picture?
  Reply With Quote
Old 29th July 2012, 05:32 PM   #5
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Lifting D13 allows the amp to function, producing clean audio output. I need to hunt down the source of this protection issue.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 29th July 2012, 08:24 PM   #6
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Anyone recognize this board, maybe have a schematic for another amp that is close.
Click the image to open in full size.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 30th July 2012, 12:35 AM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
How much difference is there between the AQ2200 that you mentioned and this amp?
  Reply With Quote
Old 30th July 2012, 12:40 AM   #8
diyAudio Member
 
Join Date: Oct 2010
This reminds me of a hifonics hercules, but I think that the hercules has a diff driverboard and more outputs, but the rest looks the same. Are those irfp064's in the ps section? Does it run a ka7500 on the ps driverboard?
  Reply With Quote
Old 30th July 2012, 12:45 AM   #9
diyAudio Member
 
Join Date: Oct 2010
I had a sundown 3000d in here last week with protect issues, turned out to be the npn transistor hooked to pin 8 on the driverboard (but it's a bigger driverboard than your 1500).
  Reply With Quote
Old 30th July 2012, 01:06 AM   #10
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
The AQ2200 uses a power supply driver board. I can't find why the protect trips right on power up. I lifted the inductors inline with the current sense for the outputs, still tripped.

Not sure where to start.
__________________
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
Schematic? Sundown SAZ-1500, Elevation Audio DX1500.1, RD 1750.1, Atomic AT-1600.1D ThyDntWntMusic Car Audio 23 13th July 2013 12:20 PM
JL 1000/1 excessive current draw bjrog2 Car Audio 9 26th April 2012 07:57 AM
Need sundown saz-3000d audio driver board info/pic 807tubenut Car Audio 17 11th March 2011 05:47 PM
Sundown SAZ 3000 D mike49504 Car Audio 36 8th November 2010 08:56 PM
Excessive current draw in Fender Deville Rockin' Andy Tubes / Valves 4 20th January 2007 09:41 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