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Realistic 31-2020A stereo graphic equalizer help

Discussion in 'Electronic Repair' started by K. Hastings, Oct 3, 2003.

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  1. K. Hastings

    K. Hastings Guest

    Our Realistic 31-2020A stereo graphic equalizer needs a new power
    transformer - before I start replacing it cautiosly, can someone tell me the
    winding voltages of the secondaries? If common part, I may be able to
    restore this otherwise-fine unit.

    Thanks, in advance (& I'll tell you when I get it fixed...)

    Kevin
     
  2. Sofie

    Sofie Guest

    K. Hastings:
    It may just be a simple matter of an "open" thermal cut-off embedded in or
    very near the primary winding of the transformer. Even if you have to
    half-way destroy the transformer to get to it, if you can power it up then
    you would be able to measure the secondaries and then obtain a near-correct
    replacement that would provide a "safe" repair.
     
  3. David

    David Guest

    Have you contacted Radio Shack yet for the part number and price?
    David
     
  4. K. Hastings

    K. Hastings Guest

    Thanks Sophie, David - Haven't ben able to get at any thrmal cut-out thus
    far, and RS says they will not identify the transformer, but the service
    manual might. Unfortunately these days, the manual + transformer are worth
    more than the unit. I'll watch for a more detailled reply before starting to
    experiment.

    Thanks-you anyways, Sophie, David
     
  5. Asimov

    Asimov Guest

    "K. Hastings" bravely wrote to "All" (04 Oct 03 18:02:12)
    --- on the heady topic of "Re: Realistic 31-2020A stereo graphic equalizer
    help"

    I have a manual for a 31-2018A but it doesn't list any voltages at all
    nor the AC power rating. However, from the 35V rating of the supply
    filter capacitors I'd guess its transformer is a center tapped/44Vac or
    22Vac/22Vac. I also have a manual for a 31-1989 and it specs the power
    AC power consumption at 10Watts. However its transformer is used single
    ended instead of center tapped. BTW the thermal fuse would likely be
    jammed inbetween the primary winding and the steel core. But if you
    can't locate the thermal fuse, which is inline with the primary winding,
    you might try a 22Vct22V at 10VA line transformer. This is only an
    educated guess but if your supply is dual ended with 35 volts caps then
    it is likely a good guess.


    KH> Reply-To: "K. Hastings" <>
    KH> From: "K. Hastings" <>

    KH> Thanks Sophie, David - Haven't ben able to get at any thrmal cut-out
    KH> thus far, and RS says they will not identify the transformer, but the
    KH> service manual might. Unfortunately these days, the manual +
    KH> transformer are worth more than the unit. I'll watch for a more
    KH> detailled reply before starting to experiment.

    KH> Thanks-you anyways, Sophie, David


    .... Power is obtained by current meeting resistance
     
  6. David

    David Guest

    How much is an exact replacement transformer from R/S?
     
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