MTX Thunder 8302 - 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 February 2013, 02:44 AM   #11
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you see audio on the base of Q301 or Q201?
  Reply With Quote
Old 24th February 2013, 02:59 AM   #12
diyAudio Member
 
Join Date: Jun 2012
Yes i see audio on both Q301 and Q201..

Amp is producing audio on the output terminals but is very low and distorted
  Reply With Quote
Old 24th February 2013, 03:02 AM   #13
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do the bias pots work like they should?

When properly biased, does the amp produce normal audio?

Is the audio on Q201/301 clean?
  Reply With Quote
Old 24th February 2013, 03:10 AM   #14
diyAudio Member
 
Join Date: Jun 2012
Neither bias pot works ..

If i turn them the current draw does not increase at all
  Reply With Quote
Old 24th February 2013, 03:19 AM   #15
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The base of Q303 goes to the bias pot. From the bias pot, there is a resistor that goes to the negative rail. Find that resistor.
  Reply With Quote
Old 24th February 2013, 03:26 AM   #16
diyAudio Member
 
Join Date: Jun 2012
R349 and 249 are both defective..

They are 47.5 ohm resistors..

Should i check anything else before i put new ones in and power the amp up?
  Reply With Quote
Old 24th February 2013, 03:37 AM   #17
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I don't know how they're being used. I think that they are part of the bias circuit but I'm not sure.
  Reply With Quote
Old 26th February 2013, 07:13 PM   #18
diyAudio Member
 
Join Date: Jun 2012
Replaced R249 and 349

Bias pots still dont work correctly..

Any ideas where to go next?
  Reply With Quote
Old 27th February 2013, 01:39 PM   #19
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Post 15?
  Reply With Quote
Old 3rd March 2013, 01:53 AM   #20
diyAudio Member
 
Join Date: Jun 2012
If the 0.22 ohm resistors are bad would that cause the amp not to Bias and burn up other resistors in the channels ??

Because i was checking them off the board and all 16 of them read 5.75 mega ohms
  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
MTX Thunder 8302 S Merlington Car Audio 1 11th February 2013 10:04 PM
MTX Thunder 8302 issue mbates14 Car Audio 14 5th January 2011 01:42 AM
MTX Thunder 1501D spooney Car Audio 49 16th July 2010 05:55 AM
same amp, new prob MTX 8302 LP filter damage Car Audio 8 8th December 2008 04:30 AM
MTX 8302 problem damage Car Audio 46 27th October 2008 05:53 AM


New To Site? Need Help?

All times are GMT. The time now is 06:17 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