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Studer A80VU MKII auto locate "LOC" switch repair w/pictures and one 15-second video

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  • Studer A80VU MKII auto locate "LOC" switch repair w/pictures and one 15-second video

    The auto locate to zero "LOC" switch that is part of the tape counter assembly started acting up intermittently on my Studer A80VU MKII.

    I started a search for the Studer part number but came up empty in my initial try except one or two out of the country.

    I then pulled the part numbers off the broken OEM switch (SAIA Miltac XCC3) and searched for it. There was one seller with approximately 120+ general purpose versions of used SAIA XCC3 switches in a bundle. I did not want a used switch for a replacement if I could avoid it.

    So, I started looking at the OEM switch makeup and SPDT electrical and mechanical function.

    Click image for larger version  Name:	Dre_SAIA-XCC3-AN.jpeg Views:	0 Size:	68.2 KB ID:	152757


    If you look at the OEM switch (in picture above), you will notice a notch at the end corner near the button. Well this is for a lever that Studer didn't use on the A80VU MKII. They use a much more robust beveled shaft on a plunger to press the switch. (There is a video at the end of the message that shows the plunger in action with the replacement switch.)

    I found something that physically looked like and matched the electrical function of the OEM switch but black in color.

    The Switch I found is a KW12-3 micro switch. It has the lever on it. I removed the lever. (See pictures below this).

    Click image for larger version  Name:	Dre_KW12-3-a-AN.jpg Views:	0 Size:	60.1 KB ID:	152758

    Click image for larger version  Name:	Dre_KW12-3-b-AN.jpg Views:	0 Size:	58.7 KB ID:	152759

    I opened the A80VU MKII again when the replacement switch arrived and removed the OEM switch from its location but left the leads soldered. I wanted to test the new switch before unsoldering the OEM one.

    Click image for larger version  Name:	Dre_KW12-3_SAIA-AN.jpg Views:	0 Size:	57.6 KB ID:	152760

    The install went perfectly (mechanically and electrically) and the new switch fit like a glove in the same location where the LOC button plunger operates.

    I then unsoldered the wires from the OEM switch and soldered them to the new switch.

    Click image for larger version  Name:	Dre_KW12-3-installed.jpg Views:	0 Size:	209.7 KB ID:	152761


    It works perfectly every time now.

    Direct Link:
    Studer A80VU MKII after "LOC" switch repair. - YouTube

    Embedded Link:


    Dre
    **************************************************
    Every day is a good day to play analog.
    - 12" 33-1/3 RPM or 45 RPM vinyl
    - 10.5" 15ips or 30ips tape
    **************************************************
    Every day is a good day for live music.
    **************************************************

  • #2
    Very clever work there.
    JLH

    Comment


    • #3
      Very nice,

      Its great when you find something that works and not a kludge especially on something like a high end Studer.
      Phono: Aesthetix Io Eclipse with 2 Power Supplies and Volume controls
      Brinkmann Balance & RonT Tube Power supply with Kuzma 4-point ,FR64S, Brinkmann 12.1 , .Koetsu Jade Platinum,Koetsu Rosewood Signature Platinum, Lyra Atlas Lamda, Lyra Etna SL Goldfinger Statement, KLAUDIO RCM, HRSM3X
      Amps: Custom Direct Drive, Wyetech Topaz, Futterman H3 Quad II,Citation II, Marantz 8b, 5 ,2. Bedini 25/25
      Pre-Amps:Marantz 7, Marantz Model 1 Consolette Pair
      Speakers: Beveridge Model 3 Direct Drive amps, REL S/2 x 2, Quad ESL pair
      Otari 5050BXII, DeHavilland 222

      Comment


      • #4
        Originally posted by jonathanhorwich View Post
        Very clever work there.
        Thanks

        Originally posted by kcin View Post
        Very nice,

        Its great when you find something that works and not a kludge especially on something like a high end Studer.
        Agree
        **************************************************
        Every day is a good day to play analog.
        - 12" 33-1/3 RPM or 45 RPM vinyl
        - 10.5" 15ips or 30ips tape
        **************************************************
        Every day is a good day for live music.
        **************************************************

        Comment

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