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In Reply to: 72-73 are easier, supposedly. 74 not so much... posted by Chris R '74 tii on January 14, 2001 at 23:59:51:
With the clock out of the dash, take the rear cover off by undioing the small screws that hold it on. You should now see the mechanism, and if you look carefully you can find where the circuit has broken. There is a point in the circuit where two small metal discs are, or should be, attached to each other (this was probably intended as a safety circuit-breaker).
The discs can come apart and break the circuit that energized the electromagnet to bring the arm up from the bottom of its cycle. You can check to see if this is the problem by attaching the clock to a 12 vold DC source and using a small screwdriver to push the discs together. The arm should fly up to the top and the clock will start ticking again. The repair is simply to solder the two discs back together."
I plan to swap in the guts from a newer VDO quartz clock of the same size -- actualy swap out the tii clock face -- but I have no idea whether it's feasible. Anybody done this?