Re: Help - 1960's vintage quartz clock in need of repair

From: Hannahblot (blot_at_blotski.com)
Date: 11/24/04 

Date: Wed, 24 Nov 2004 10:41:41 +0000 (UTC)

On Wed, 24 Nov 2004 03:12:12 GMT, jpero@sympatico.ca (Jason D.) wrote:

>On Tue, 23 Nov 2004 11:36:47 +0000 (UTC), Hannahblot
><blot@blotski.com> wrote:
>
>>Hi, I wonder if anyone might be able to help me figure out the most
>>likely reason an old 1960's battery clock has stopped working.
>>
>>The clock has an unusual battery powered movement so i can't just swap
>>it out for a more modern one. It's such a nice old retro design I
>>don't want to bin it either.
>>
>>I have a link to a .jpg of the clock's circuit board below.
>>
>>My first guess is that it is the capacitor but I am unsure how I would
>>go about testing this (I have a multimeter) or any of the other
>>components.
>>
>>Runs off a single D cell battery, battery and contacts are fine.
>>
>>http://home.btconnect.com/metaluna/clock/clockcirc.jpg
>>
>>
>>Thanks
>>
>>Hannahblot
>
>I'm very famillar with this design, no quartz, it uses the magnetic
>impulses in both directions and hair spring (thin, fine coiled spring
>with slot in the finger for the hairspring for setting clock (slowing
>balance wheel down or speed it up to correct timing error). Coil has
>two windings, trigger and impulse.
>
>Couple caps is to give nice proper impulse to the magnets in the
>balance wheel. Resistor limits the current or to bias the transistor
>off. The triggering energy is done from one trigger winding that was
>generated by the magnets when passing through that coil. This biases
>the transistor on for a pulse to impulse winding to repel (or attact?)
>magnets (balance wheel had moved sufficent by then trigger-impulse
>happened). Happens on both directions.
>
>I use to collect those type of movements when I was younger when they
>were plentiful back then (1980's). Unfontunely don't have them. Try
>the older clock/watch shops, they may have a bunch of those in all
>kinds.
>
>The red one is poly cap, reliable. The blue one is electrolytic and
>tend to dry out. Change this one, watch the polarity. Black one with
>3 legs is transistor. I think generic NPN transistor should do.
>
>That coil, be very careful and gentle. Windings is made of very fine
>gauge.
>
>Cheers,
>
>Wizard

Thanks for the advice Wizard.

Hannahblot

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