Kenwood Kac-8104D Problem

bigpun4fubu · 9th November 2011, 10:07 PM

When powered up first it would come on for a sec then blow the 10A safety fuse on my power supply, ( i have this to keep from overloading it , while i use it for testing purposes) all of the mosfets seem to check good, its almost like it is shorting out though, but now i can power it up and the blue light comes on and the red light does not, i was thinking it was a power mosfet but the seem to check good. anyone familiar with this problem?

brandes.cm · 9th November 2011, 10:10 PM

Cycle the power really fast the first 3-4 times to let the caps charge, you might be experiencing a huge in-rush that is taking out the fuse.

Perry Babin · 9th November 2011, 10:18 PM

What type of fuse are you using?

bigpun4fubu · 9th November 2011, 10:36 PM

ato 10 amp

Perry Babin · 9th November 2011, 10:38 PM

The ATO/ATC generally hold but you may need a 15 amp fuse for this amp (brandes was likely correct). A 15 amp fuse is generally safe for all amplifiers as long as all power semiconductors are clamped to the heatsink.

bigpun4fubu · 9th November 2011, 10:39 PM

even with no signal input?

bigpun4fubu · 9th November 2011, 10:44 PM

yeah all semiconductors are clamped during power

bigpun4fubu · 9th November 2011, 10:45 PM

and also a time or 2 it would overload the powersupply and cause it to shut down if it didnt blow the fuse

Perry Babin · 9th November 2011, 11:01 PM

What sort of supply did it shut down?

bigpun4fubu · 9th November 2011, 11:18 PM

its a 20 amp 12v powersupply, i just use it for test purposes , ive had way stronger amps on it and havent had any problem testing them , im just trying to trouble shoot this amp it should power up and stay on with that power supply

9th November 2011, 10:07 PM	#1
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	Kenwood Kac-8104D Problem When powered up first it would come on for a sec then blow the 10A safety fuse on my power supply, ( i have this to keep from overloading it , while i use it for testing purposes) all of the mosfets seem to check good, its almost like it is shorting out though, but now i can power it up and the blue light comes on and the red light does not, i was thinking it was a power mosfet but the seem to check good. anyone familiar with this problem?

9th November 2011, 10:18 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What type of fuse are you using? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th November 2011, 10:38 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The ATO/ATC generally hold but you may need a 15 amp fuse for this amp (brandes was likely correct). A 15 amp fuse is generally safe for all amplifiers as long as all power semiconductors are clamped to the heatsink. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th November 2011, 11:01 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What sort of supply did it shut down? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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9th November 2011, 10:10 PM	#2
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Cycle the power really fast the first 3-4 times to let the caps charge, you might be experiencing a huge in-rush that is taking out the fuse.

9th November 2011, 10:36 PM	#4
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	ato 10 amp

9th November 2011, 10:39 PM	#6
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	even with no signal input?

9th November 2011, 10:44 PM	#7
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	yeah all semiconductors are clamped during power

9th November 2011, 10:45 PM	#8
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	and also a time or 2 it would overload the powersupply and cause it to shut down if it didnt blow the fuse

9th November 2011, 11:18 PM	#10
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	its a 20 amp 12v powersupply, i just use it for test purposes , ive had way stronger amps on it and havent had any problem testing them , im just trying to trouble shoot this amp it should power up and stay on with that power supply

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