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Re: Vintage Pioneer SX-838 receiver loses one channel after warmup

Discussion in 'Electronic Repair' started by [email protected], May 25, 2009.

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  1. Guest

    I can think of a number of possible causes, but it should be possible
    to run down the problem without any sophisticated test equipment.
    Yes, a signal generator and scope would make it a trivial problem.
    The schematic / service manual seems to be available free here: (registration

    I'd suggest setting the volume at a moderate level and measuring the
    AC signal level at various points in the signal path, comparing the
    levels at right and left channels. Use a mono source. You might get
    exceptionally lucky and discover the signal pops back in when you
    probe a particular point.

  2. GregS

    GregS Guest

    I was quickly reading through the posts and I don't see Bang on IT.
    Thats a method I always use.

    Yesterday I was drilling some holes in the bathroom wall with an inpact drill,
    and I did have some reserve being some AC and other stuff
    in the wall, but off to the side. I was sweating and I go arounfd to the other side
    and find in horror the thermostat screen blanked out. I start
    sweating even more knowing the AC is off. I banged on it and installed
    new batteries. I was afraid the wires might be shorting and some
    thermostats get some power from the line. I finally ended up
    banging on it again, this time in the proper method
    aparently and it came back on. I don't know if I can trust this
    thing now. I think it reset to a default temp last night cause I set
    it to 69 F and found it 78 this morning. I got a back up thermostat
    to install.

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