Kenwood KAC 8101D - 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 May 2010, 08:18 PM   #1
diyAudio Member
 
Join Date: Sep 2006
Default Kenwood KAC 8101D

I have this amp in for repair. When i opened the amp up and started checking stuff out I found the following .

10 ohm resistors connected to leg 1 of the outputs were Defective.

Q53 (C3940) to be defective
Q22 (A1123) to be defective.
Q63,Q64 A1266 to be defective.

Also D53 is a diode looks like a zener it has 153 on it nothing else Do you know what diode this is??
I put a 1n4148 in its spot to test the amp.

The problem im having now is the gain has to be fully counter clockwise and the amp will produce sound but very quiet.

If i start turning the gain up the amp makes the speaker flutter like crazy like im getting 100 volts to it. I put my test leads on the output and when the amp does this i dont have any Dc on the outputs.

Wondering what might cause this?
  Reply With Quote
Old 14th May 2010, 08:55 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
D53 is a 15v Zener diode. Using the 1N4148 likely allowed high voltage to reach the op-amps and may have caused significant damage. You'll need to replace it with the correct part and troubleshoot from there.

The noise sounds like the amp or signal source has an open shield ground.
  Reply With Quote
Old 14th May 2010, 08:58 PM   #3
diyAudio Member
 
Join Date: Sep 2006
What part number will work for the diode?
  Reply With Quote
Old 14th May 2010, 09:16 PM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If it was the size of a 1N4148, a 1N5245 would be the sub.

Looking at the schematic again, this appears to be for the driver supply voltage so the op-amp wouldn't have likely been damaged.
  Reply With Quote
Old 14th May 2010, 09:26 PM   #5
diyAudio Member
 
Join Date: Sep 2006
How do i check for an open shield ground on this amp?
  Reply With Quote
Old 14th May 2010, 11:26 PM   #6
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
On this amp, the only shield ground connection likely to fail would be at the RCA jacks. Confirm that you have continuity between the shield (of both the left and right jacks) and the circuit board where the shield terminal on the jack is soldered to the board. Move the jack around while checking continuity in case the connection is intermittent. Don't have any RCAs plugged into the jacks.
  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
kenwood kac-715 purocolt Car Audio 6 16th May 2014 11:23 PM
Kenwood KAC-628 mike49504 Car Audio 14 12th May 2010 11:17 PM
Kenwood KAC-X4R matdotcom2000 Car Audio 0 20th December 2007 03:36 PM
Kenwood KAC-X301T and KAC-X201T:Do they share the same board? spooney Car Audio 1 25th October 2007 02:08 AM
kenwood kac 7202 mike49504 Car Audio 4 17th October 2006 10:43 PM


New To Site? Need Help?

All times are GMT. The time now is 10:04 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