KENWOOD KAC 7252 CAR AMP - 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 14th April 2013, 07:55 AM   #1
diyAudio Member
 
Join Date: Nov 2012
Default KENWOOD KAC 7252 CAR AMP

Hello Everyone,

My Car amp on powering on the red light glows for a sec or two and then goes into protect, can some one be kind enough to guide me throught the repair of this amp.

Thanks in Advance
  Reply With Quote
Old 14th April 2013, 06:08 PM   #2
diyAudio Member
 
Join Date: Sep 2011
Location: Texas
First, I recommend opening the amplifier to see if you notice any fried components. When resistors blow, they can leave a black mark. The good news here is that the problem might be rather simple given that it is going into protect mode.

The repair might be more costly than a new amplifier though if you have lost some output transistors.

You might want to wait to see if Perry replies. He's far more knowledgeable when it comes to car amplifiers than I am.
__________________
2X Com-tech 400, Improved Headphone Amplifier
  Reply With Quote
Old 15th April 2013, 07:42 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
There are 8 large transistors clamped to the heatsink on this amp. Measure the resistance between the 3 legs of each of the individual transistors. Do you read anything near 0 ohms between the legs of any of the transistors? Try all probe/transistor leg combinations for each transistor.
  Reply With Quote
Old 15th April 2013, 10:51 AM   #4
diyAudio Member
 
Join Date: Nov 2012
Thanks for the reply, I checked the resistance between the legs of all the output transistors there is some kind of resisstance between the legs. I have managed to download the schematic of this model.

Please advice what should i be doing next.

Thanks
  Reply With Quote
Old 15th April 2013, 11:08 AM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You need to be more specific. 'Some kind of resistance' isn't helpful.
  Reply With Quote
Old 15th April 2013, 11:50 AM   #6
diyAudio Member
 
Join Date: Nov 2012
Hi Perry, the resistance is above 1.5 -1.75 in between(between any two legs)
  Reply With Quote
Old 17th April 2013, 12:10 AM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
1.5-1.75 what?

It's unlikely that you have a meter that can read down to 0.00 ohms. It's more likely that you have an non-autoranging meter and had it set to a high range. If so, set it to the lowest range and re-check them.
  Reply With Quote
Old 17th April 2013, 10:00 AM   #8
diyAudio Member
 
Join Date: Nov 2012
Hi Perry,

Thanks for your support and guidance.
Manged to fix it, it had few leaky diodes, dry joints and a bad collector transistor.

it sound Awesome!!!

Once again Thanks
  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
Finished Car Amplifier schematic + PCB based on Kenwood KAC-716 Risto80 Car Audio 157 26th November 2012 09:00 AM
kenwood kac-921 car amp steven344 Solid State 0 26th November 2008 06:40 PM
kenwood kac-7252 schematic Hi Speed Car Audio 0 10th May 2007 07:59 PM
Kenwood KAC-628 car amp wahee Solid State 0 21st September 2004 09:02 AM


New To Site? Need Help?

All times are GMT. The time now is 07:48 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