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Luxman L100U Have Right channel out. unit will play right channel if I switch/cross preamp jumpers l to r r to l. I can then hear output using balance control on right side. unit had 2 bad 5amp fuses on power supply. I rplaced them and this is where I am at. I need troubleshooting dissection points. I also have a blurry schematic. Thanks, Ray

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  • Master
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Hi and welcome to FixYa,

Based on your post, probable fault would be in the right channel pre-amp section since the right amp would work also/still with the switching of the the pre-amp jumpers, hence none of the amps would be faulty.

The 2 5A fuses could be for the +/- supply while the right channel pre-amp could have a faulty transistor, a limiting resistor, regulator/diode. Perhaps you can post the schematic.

Good luck and thank you for using FixYa.

Posted on Feb 07, 2009

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  • Master
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Hi,
tell me that you change the right amp. fuse.
or change to some low amp's.
Thanks
.

Posted on Feb 07, 2009

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  • Master
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Ensure that you do not have just a faulty speaker, swap speakers connection first.

Posted on Feb 07, 2009

  • Ginko
    Ginko Feb 07, 2009

    If by using balance you can hear the sound on the right channel, and by swapping channels on preamp section you can hear sound then the problem is either preamp or controls.

    Start testing the balance control, that is the most likely cause for the problem.

    If the balance is ok, then the preamp circuit for the right channel has a blown component or a lose contact (broken solder joingt usually), that is the reason why it works when you swap channels.


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