Jensen XA4100 1 channel not working

PCDEC · 11th June 2004, 05:55 AM

It's a 4 ch bridgeable amp. Channel B, C, and D work fine and C/D bridged work fine but channel A doesn't work and A/B bridged don't either. I don't see any burnt/destroyed components on the board or any broken or loose soldier connections.

I have no experence repairing amps but I have done a little electronics repair. What component(s) are most likely bad to cause this problem?

pape · 11th June 2004, 05:55 PM

I would think the FET's on channel A are a good possibility.
It should be easy to figure out since it is one channel. Test the components from one good channel to channel A and find out what is different. You should be able to test the FETs on the board and compare to a good channel.

PCDEC · 12th June 2004, 06:45 AM

There are 2 per channel I believe. How exactly do I test them? I have a digital multimeter and that's it.

pape · 14th June 2004, 12:01 PM

http://www.bcae1.com/ampfail.htm

read that. Although you can't really use his readings as what they should be, since they will only test that way off the board. do the same type of measurements on a good channel and check those results against the messed up one.

zagisrule! · 17th June 2004, 04:13 AM

Might be a burnt trace too...

-Matt

Paradise_Ice · 18th June 2004, 01:09 PM

some dead duck FETs, its most common, and its easy to repair, just a desoldering pump and a new Fet of equal value, your on your way!

11th June 2004, 05:55 AM	#1
PCDEC diyAudio Member Join Date: Jun 2004 Location: usa	Jensen XA4100 1 channel not working It's a 4 ch bridgeable amp. Channel B, C, and D work fine and C/D bridged work fine but channel A doesn't work and A/B bridged don't either. I don't see any burnt/destroyed components on the board or any broken or loose soldier connections. I have no experence repairing amps but I have done a little electronics repair. What component(s) are most likely bad to cause this problem?

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11th June 2004, 05:55 PM	#2
pape diyAudio Member Join Date: May 2004 Location: usa	I would think the FET's on channel A are a good possibility. It should be easy to figure out since it is one channel. Test the components from one good channel to channel A and find out what is different. You should be able to test the FETs on the board and compare to a good channel.

12th June 2004, 06:45 AM	#3
PCDEC diyAudio Member Join Date: Jun 2004 Location: usa	There are 2 per channel I believe. How exactly do I test them? I have a digital multimeter and that's it.

14th June 2004, 12:01 PM	#4
pape diyAudio Member Join Date: May 2004 Location: usa	http://www.bcae1.com/ampfail.htm read that. Although you can't really use his readings as what they should be, since they will only test that way off the board. do the same type of measurements on a good channel and check those results against the messed up one.

17th June 2004, 04:13 AM	#5
zagisrule! diyAudio Member Join Date: Apr 2004 Location: Edgewood, NM	Might be a burnt trace too... -Matt

18th June 2004, 01:09 PM	#6
Paradise_Ice diyAudio Member Join Date: Jun 2004 Location: cosmological consciousness	some dead duck FETs, its most common, and its easy to repair, just a desoldering pump and a new Fet of equal value, your on your way!