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Trying to See if I Can Fix This Desk Clock

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Boris_yo:
Hello. The clock's not showing any activity with fresh alkaline batteries. After opening the back cover the cogs don't move. They are supposed to?The coil on top has a wire loose. Don't know if it's supposed to be that way.

(Click to enlarge)


I don't have any expertise with fixing clocks but I like tinkering with stuff. I wonder which part of the clock failed and whether I can fix it before throwing it away. Thanks.

Alex Eisenhut:
Looks like a bunch of gears not meshing.

Boris_yo:

--- Quote from: Alex Eisenhut on October 29, 2022, 02:45:53 pm ---Looks like a bunch of gears not meshing.

--- End quote ---

I removed the red cog and the white cog, leaving only the central one. It doesn't move regardless. I thought it's the one responsible for moving the pointers.

mariush:
My guess is the coil is an electro-magnet which is turned on every second and moves a metal piece a short distance which in turn rotates a wheel, which then turns the other wheels.
If the wire is broken/ loose it's no longer an electromagnet. See what happens when you touch that loose wire to the pad from where it broke off

amyk:
https://en.wikipedia.org/wiki/Lavet-type_stepping_motor

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