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  • SX-64 Whine

    From Frank Linhares@39:905/0 to All on Monday, December 09, 2019 21:15:14
    I recently picked up a Commodore SX-64 and am completely in love with it.

    The unit is in amazing condition and the previous owned cared for it with
    lots of TLC.

    I do have one issue that I am hoping other may have run into. When I turn the unit on, it emits a high pitched whine. My nearly 50 year old ears can barely register the whine, but it drives my kids crazy.

    I am wondering if anyone has experienced this before. Could it be a bad
    ground?

    |15frank |08// |15netsurge
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  • From Wilfred van Velzen@39:150/200 to Frank Linhares on Tuesday, December 10, 2019 08:33:40
    Hi Frank,

    On 2019-12-09 21:15:14, you wrote to All:

    I recently picked up a Commodore SX-64 and am completely in love with
    it.

    The unit is in amazing condition and the previous owned cared for it with lots of TLC.

    I do have one issue that I am hoping other may have run into. When I turn the unit on, it emits a high pitched whine. My nearly 50 year old ears can barely register the whine, but it drives my kids crazy.

    I am wondering if anyone has experienced this before.

    Nope. (With any electronic device, but my ears are as old as yours ;))

    Could it be a bad ground?

    The first thing I would do is (visually) check the capacitors. Bad ones are easy to spot. And are the first things to go in old devices (maybe new ones too
    :-()...


    Bye, Wilfred.

    --- FMail-lnx64 2.1.0.18-B20170815
    * Origin: FMail development HQ (39:150/200)
  • From Frank Linhares@39:905/0 to Wilfred van Velzen on Monday, December 16, 2019 22:30:19

    The first thing I would do is (visually) check the capacitors. Bad
    ones are easy to spot. And are the first things to go in old devices

    CRTs are a bit different than your run of the mill PCB, Caps are far and few
    as they tend to use flybacks to generate their power.

    I have replaced more than my fair share of caps on my Amigas and C64s. I
    wish that was the issue.

    It turned out to be a bad ground. The outlet I happened to use had an open ground. The minute I moved the SX over to another outlet whos ground was properly wired, the hum was no more.

    I wish everything was this easy to fix.


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