Help needed, reward for solution! - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 20th March 2012, 10:07 PM   #1
diyAudio Member
 
Join Date: Feb 2012
Default Help needed, reward for solution!

Hello everyone. I recently made the mistake of my wiring my amp in reverse polarity Yes, I am idiot. The fuses on amp blew, replaced fuses and they blew again.. Amp is an MB quart onyx 1500

I am offering $20 PayPal for who ever can come up with the solution. I already pulled the cover off and nothing appears burned. I do have a multimeter. So where do I go I from here.. Like I said, $20 for whoever can determine what's wrong. Let's get this fixed!
  Reply With Quote
Old 20th March 2012, 10:41 PM   #2
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
You will have fried the chip and possibly some electrolytics too.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 20th March 2012, 10:44 PM   #3
diyAudio Member
 
Join Date: Feb 2012
So basically no hope? I read something about a reverse polarity diode.. Where would that be?
  Reply With Quote
Old 21st March 2012, 12:06 AM   #4
diyAudio Member
 
Join Date: Feb 2012
I am reading the manual. There is no reverse polarity protection, only output protection. It uses a PWM power supply and you have probably fried it to say the least. I understand that you crossed + and - at the power input correct?

Your amp is mosfet based class D and offers no input protection, only output to speaker. I would remove the 12V power. Pull the fuses, wait 2-5 minutes to bleed down and use a multimeter to measure resistance of the amps + and - terminals after the fuses. It is probably a short circuit (your blowing fuses) and check both polarities red to + and black to -, and then switch them. There is no doubt there is probably a short present, you have 2x70A fuses. The fuses are there to prevent a fire, and maybe save the amp at those power levels.

Either way you are cracking the case and doing trouble shooting and surgery. start at the front end and look with the eyes and then with the meter.

Last edited by NissanSR20Man; 21st March 2012 at 12:11 AM.
  Reply With Quote
Old 21st March 2012, 01:39 AM   #5
diyAudio Member
 
Join Date: Feb 2012
Thanks for the reply! Yes crossed at the + and negative on amplifier. I have removed the case and do not see any visible damage.. I put the positive lead of the multimeter to the postive and negative to negative and show no resistance. Not even getting any kind of reading

Quote:
Originally Posted by NissanSR20Man View Post
I am reading the manual. There is no reverse polarity protection, only output protection. It uses a PWM power supply and you have probably fried it to say the least. I understand that you crossed + and - at the power input correct?

Your amp is mosfet based class D and offers no input protection, only output to speaker. I would remove the 12V power. Pull the fuses, wait 2-5 minutes to bleed down and use a multimeter to measure resistance of the amps + and - terminals after the fuses. It is probably a short circuit (your blowing fuses) and check both polarities red to + and black to -, and then switch them. There is no doubt there is probably a short present, you have 2x70A fuses. The fuses are there to prevent a fire, and maybe save the amp at those power levels.

Either way you are cracking the case and doing trouble shooting and surgery. start at the front end and look with the eyes and then with the meter.
  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
transmitting wireless audio to remote speaker-reward beochie Digital Source 0 2nd February 2012 06:40 PM
Solution Needed,,,Quickly! Remote Leads for Both Amps Not Working! 19EDR Car Audio 1 4th April 2011 07:09 AM
Bose IC & pinouts $REWARD$ packer Parts 14 2nd July 2007 07:49 PM
Best Solution ?? cybtech Multi-Way 5 6th July 2004 10:26 AM
AD1853 DAC board for review - reward tiroth Digital Source 1 1st January 2003 03:41 AM


New To Site? Need Help?

All times are GMT. The time now is 11:50 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