Hifonics BXI608 repair - 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 18th March 2010, 02:34 AM   #11
diyAudio Member
 
Join Date: Jul 2009
Yes, they are all blown, I'm guessing the gate resistors are blown also, so I'm gonna order those.
  Reply With Quote
Old 18th March 2010, 02:41 AM   #12
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It's rare for more than 1 output to fail on each side but even if that's the case, you'll have to replace all of them because they're in parallel groups.

Before you order parts, you should check the drive signal for the FETs. Do you have a scope yet?

Can you post a photo of the inside of the amp?
  Reply With Quote
Old 22nd March 2010, 02:17 AM   #13
diyAudio Member
 
Join Date: Jul 2009
I do have access to a scope, and will check the signal tomorrow. I just took a pic of the guts and Ill post it following this.
  Reply With Quote
Old 22nd March 2010, 02:53 AM   #14
diyAudio Member
 
Join Date: Jul 2009
Click the image to open in full size.
  Reply With Quote
Old 24th March 2010, 07:14 PM   #15
diyAudio Member
 
Join Date: Jul 2009
I havent gotten a chance to check the signal yet Perry, as I have pulled a few of the FETs out. Is there any way of checking the FETs for a short or open with them in the circuit?
  Reply With Quote
Old 24th March 2010, 07:52 PM   #16
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Checking them in the circuit isn't definitive unless they're shorted or leaking badly. If they're in parallel with FETs that failed, they'll have to be replaced.
  Reply With Quote
Old 31st March 2010, 10:44 PM   #17
diyAudio Member
 
Join Date: Jul 2009
which are the drivers for this amp?
  Reply With Quote
Old 31st March 2010, 10:58 PM   #18
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Can you re-post the photo of the inside of the amp (or email it to me babin_perry@yahoo.com)?
  Reply With Quote
Old 1st April 2010, 02:12 PM   #19
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If I'm not mistaken, the transistors in the yellow rectangle are the drivers. Check the signal on the first leg of each driver transistor. The right (falling) edge of the drive waveform should be perfectly vertical down to within ~1v of ground. Compare it to the waveform on pins 9 and 10 of the TL494/TL594/ka7500 driver IC. In the attached photo, the top waveform shows a good drive signal. The bottom waveform shows a bad drive signal produced due to a defective driver transistor.

Also check the gate resistors for each of the power supply FETs.
Attached Images
File Type: jpg hifonx.jpg (83.8 KB, 42 views)
File Type: jpg psP1010089b.jpg (70.9 KB, 37 views)
  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
Hifonics BXI608 repair greg_gorrell Class D 0 17th March 2010 05:02 AM
Hifonics Eros Perry Babin Car Audio 8 28th December 2009 06:08 AM
Hifonics BX1000D Dobermann Car Audio 2 26th September 2008 04:27 PM
Hifonics Problem swordfish689 Car Audio 5 2nd April 2007 03:49 PM
Hifonics Cupid Lasse- Car Audio 3 5th February 2004 10:28 PM


New To Site? Need Help?

All times are GMT. The time now is 01:46 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