Jensen XA4100 1 channel not working - diyAudio
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Old 11th June 2004, 05:55 AM   #1
PCDEC is offline PCDEC  United States
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Default 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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Old 11th June 2004, 05:55 PM   #2
pape is offline pape  United States
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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.
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Old 12th June 2004, 06:45 AM   #3
PCDEC is offline PCDEC  United States
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There are 2 per channel I believe. How exactly do I test them? I have a digital multimeter and that's it.
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Old 14th June 2004, 12:01 PM   #4
pape is offline pape  United States
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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.
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Old 17th June 2004, 04:13 AM   #5
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Might be a burnt trace too...











-Matt
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Old 18th June 2004, 01:09 PM   #6
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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!
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