Seiko SUS 6M26-8050 "Dancing Hands"

Thread: Seiko SUS 6M26-8050 "Dancing Hands"

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  1. #1
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    Seiko SUS 6M26-8050 "Dancing Hands"

    Hello,

    I have a Seiko 6m26A watch in which no one stepper motor works.
    When I set the stopwatch function, after pressing the start and reset pushers, a beep sounds.
    It even rings the alarm signal at the time stored in the processor.
    Unfortunately, regardless of the function selected, the right beeps are heard, but all the hands and date are dead.
    Inside the case everything seemed to be complete.
    I unscrewed it and washed the connection and electronics boards.
    I did a hard reset (after changing the battery) and soft reset (clock reset using pushers).
    Nothing but beeps.
    Maybe someone can tell where to look for a fault in this system?

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    Raf.

  2. #2
    JAA
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    Re: Seiko SUS 6M26-8050 "Dancing Hands"

    Need clarifications:

    what did you mean by "no one" step motor works?

    are you working with the service manual?

    https://www.thewatchsite.com/files/S...uals/6M26A.pdf

    Easiest is to try a different battery. It takes more voltage to turn the hands than run the electronics. If you have a meter, check the voltage.

    The way to fix it is to rule out one possibility at a time.

  3. #3
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    Re: Seiko SUS 6M26-8050 "Dancing Hands"

    Thank you for the quick reply. I really appreciate it.

    What I have done so far in the case of 6m26a:
    1. I dismantled the mechanism and washed with isopropanol:
    • "printed circuit board" (part 26 in the image 6m26_pic1.jpg)
    • "Circuit block" (part 27 in the image 6m26_pic1.jpg)

    2. I replaced the battery with a new one and checked the voltage (I even tested it with two different batteries).
    4. I reset the circuit board (image 6m26_pic2)
    5. I reset the watch (set MODE INDICATOR to “CHRONO" -> Pull out the CROWN -> Press and hold A and B buttons at the same time for 2 seconds -> beep sounds when the buttons are released)

    Nothing but beeps, - hands do not move.

    image "6m26_pic1"
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    image "6m26_pic2"
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  5. #4
    JAA
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    Re: Seiko SUS 6M26-8050 "Dancing Hands"

    Since none of the hands move, I would suspect not all 4 step motor coils failed at the same time. The only common part might be the upconverter coil that you can test it with an ohm meter.

    If that checks out, my only additional suggestion is that you ask the question where someone knowledgeable about this movement is more likely to see it. You can try: watchrepairtalk.com

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