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Repairng Proprietary FDS Floppy Drive. Quick Disk drive

Discussion in 'Electronic Repair' started by Michael Kennedy, Oct 7, 2005.

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  1. I need some tips on how to get a floppy drive working. It is in a nintedo
    disk system it is similar to Quick Disk drives of 20 years ago. Someone else
    already tried replacing the drive belt and it still didn't work. There is
    also a speed adjustment. Does anyone have a service manual for one of these
    floppys. I think the read head (single sided) may be out of alignment. I
    know you can use a scope with a service manual to adjust a normal floppy
    drive. Any ideas?

    - Mike
  2. Franc Zabkar

    Franc Zabkar Guest

    I think it will be difficult, if not impractical, to attempt a head
    alignment without an alignment diskette. As for adjusting the speed,
    if you know the target RPM, and if it is a multiple of your mains
    frequency, then it should be a simple matter to design a paper strobe
    disc that you could attach to the drive motor and watch under a
    fluorescent light.

    -- Franc Zabkar

    Please remove one 'i' from my address when replying by email.
  3. James Sweet

    James Sweet Guest

    Neon glow lamp works much better.
  4. Sounds like a good idea, but I don't know where to start with the paper disk
    idea. Sounds like what they used to have on the bottom of IBM 5.25 floppy
    drives in the early 80's. Befor I was born but I have worked on about every
    kind of pc from an 8086 up to today's stuff.

    - Mike
  5. Franc Zabkar

    Franc Zabkar Guest

    Let's say the FDD spins at 300 RPM. That's 5 revs/sec. Assume mains
    frequency is 60Hz. Make a paper disc with 24 sectors alternating black
    and white. Assume that at time zero the strobe flash illuminates a
    black sector. The next flash arrives 1/60 sec later, at which time the
    motor will have rotated through 1/12 (=5/60) rev. This means that the
    same image will now be under the strobe, making it appear stationary.
    -- Franc Zabkar

    Please remove one 'i' from my address when replying by email.
  6. Asimov

    Asimov Guest

    "James Sweet" bravely wrote to "All" (08 Oct 05 02:36:26)
    --- on the heady topic of "Re: Repairng Proprietary FDS Floppy Drive. Quick
    Disk drive"

    JS> From: "James Sweet" <>
    JS> Xref: core-easynews

    JS> Neon glow lamp works much better.

    A small panel light (#47 etc) with a rectifier diode in series is fine
    too. Just take into account that the flicker rate will be 60Hz with
    this but it will be 120Hz with the neon. I guess one could always put
    a rectifier in series with the neon.


    .... Electrical Engineers do it with more frequency and less resistance.
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