Kole Audio Amp

mike49504 · 22nd June 2010, 05:27 PM

I got this amp in for repair . It had no output so i removed the board from the sink and redid some solder connections.

With the board out of the sink it will power up and produce audio.

If i put the board back in the sink and put all clamps back in the amp will power up fine but not produce audio and the rca jacks will spark like the heatsink has voltage.

Something conducting?? Or what might cause this

Perry Babin · 22nd June 2010, 05:36 PM

With it clamped down and no power applied, what is the resistance from the B+ terminal of the amp to the RCA shield?

mike49504 · 22nd June 2010, 05:53 PM

2.032 k ohms and it continues to climb

Perry Babin · 22nd June 2010, 06:00 PM

Try twisting the transformer to see if it changes.

mike49504 · 22nd June 2010, 06:15 PM

Twisted the transformer and got 3.92 k ohms now. Left channel produces clean audio right channel still dead

Perry Babin · 22nd June 2010, 06:23 PM

Does the heatsink have any voltage on it?

Do the RCA shields have any AC or DC voltage on them? Check with your scope as well as your multimeter.

mike49504 · 22nd June 2010, 06:38 PM

Heatsink has 45.2 volts on it. Rca jacks have -0.72 volts on them

Perry Babin · 22nd June 2010, 06:41 PM

Check the resistance from the tabs of the rectifiers and outputs to see if any are shorted to the sink.

968driver · 22nd June 2010, 06:53 PM

Check isolation between power transistors and heathsink.
Some amplifiers used metal anodized isolators, and these can break down.

mike49504 · 22nd June 2010, 07:10 PM

Ok i found one shorted to the sink.

I took the entire board out of the sink again since the right channel still doesnt work.

I see alot of crappy solder joints on this board so i will re solder them and see it i can get this amp up and running.

22nd June 2010, 05:27 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Kole Audio Amp I got this amp in for repair . It had no output so i removed the board from the sink and redid some solder connections. With the board out of the sink it will power up and produce audio. If i put the board back in the sink and put all clamps back in the amp will power up fine but not produce audio and the rca jacks will spark like the heatsink has voltage. Something conducting?? Or what might cause this

22nd June 2010, 05:36 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With it clamped down and no power applied, what is the resistance from the B+ terminal of the amp to the RCA shield? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd June 2010, 06:00 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Try twisting the transformer to see if it changes. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd June 2010, 06:23 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the heatsink have any voltage on it? Do the RCA shields have any AC or DC voltage on them? Check with your scope as well as your multimeter. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd June 2010, 06:41 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check the resistance from the tabs of the rectifiers and outputs to see if any are shorted to the sink. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	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

22nd June 2010, 05:53 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	2.032 k ohms and it continues to climb

22nd June 2010, 06:15 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Twisted the transformer and got 3.92 k ohms now. Left channel produces clean audio right channel still dead

22nd June 2010, 06:38 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Heatsink has 45.2 volts on it. Rca jacks have -0.72 volts on them

22nd June 2010, 06:53 PM	#9
968driver diyAudio Member Join Date: May 2008	Check isolation between power transistors and heathsink. Some amplifiers used metal anodized isolators, and these can break down.

22nd June 2010, 07:10 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok i found one shorted to the sink. I took the entire board out of the sink again since the right channel still doesnt work. I see alot of crappy solder joints on this board so i will re solder them and see it i can get this amp up and running.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Kole XP2-2000 trouble	mbates14	Car Audio	11	21st February 2010 05:34 PM
Kole KX1-5500D in protect mode. Shorted diode?	barros57	Class D	2	13th February 2010 01:41 PM
For Sale Or Trade: Adire Audio Brahma, Rythmik Audio Plate Amp	tmort	Swap Meet	5	27th June 2009 12:29 AM
[UK] 2x Pro Audio C12 - 300MB & 2x Pro Audio PST888 Tweeters for Sale	makksus	Swap Meet	0	3rd November 2008 12:12 PM
Kole Audio Amp Problem...HELP	dozan1	Car Audio	4	14th February 2007 06:51 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read