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Thread: Repairing Miniscribe 8450 xt

  1. #1

    Default Repairing Miniscribe 8450 xt

    I have this disk Miniscribe 8450 xt. It is from an Amstrad 1640. It is disk on a card. It appears dead. The spindle motor never turns.
    The motor is not blocked. I am able to turn it.

    The one thing I noticed is that all film capacitors give voltage except for one near the power input. All 22/16V capacitors give 12 volts except for this one. Same for the 6V capacitors , they give 5V.
    disk.png
    The one in question is in the red rectangle. Power comes from top left corner of the card.
    I do not have a 22/16V. Can I just try with 10/50V to just see if this is the problem? Maybe I can put it for a second and see if the motor will move? Is there other way to test while not having the proper capacitor?
    Last edited by tonata; November 21st, 2020 at 02:35 PM.

  2. #2
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    Yes, you can try one out; it will do no harm. But when you say "no voltage", have you tried measuring resistance across the capacitor without power attached?

  3. #3

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    The 22/16V is still soldered. I have not removed it yet.
    I have set my multimeter to 20k in the resistance section and it gives 0.98 as a reading.
    So you are saying replacing temporally a 22/16V with 10/50V is OK?

  4. #4
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    Yes, just be sure to observe polarity.

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