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Kramer

Kramer

By Kramer
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Kramer New Member

Kramer

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Hello from California.  I have an old corum quartz watch that has begun to run very fast , new battery , still fast. Do you think that is repairable?  it's marked corum 247498  and also 956412. I found a 956412 movement that also has numbers dt3/dt6   and    2h/3h . what are the last few numbers referring to ? date3 or 6? mine is at 6  and 2h,3h? thanks anyone, Kramer

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ecodec WRT Addict

ecodec

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Hi Kramer, I do not know the watch but if it runs that fast Check the frequency the oscillator is running at, 32.768 Khz is the magic figure. You will need a GOOD frequency counter. Look at it at the crystal or the input to the chip.   The timing capacitor may have come adrift etc, from the crystal to the +ve rail. To slow the frequency down you can make up a "gimmick" capacitor and solder it from the crystal  to the +ve rail. Hope this helps.  Regards, Mike.

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AndyHull Distinguished Member

AndyHull

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Another thing worth checking. Clean the battery contacts on the circuit board. Oxidation of the contacts can vastly increase their resistance which will have a similar effect to a flat battery, as it will reduce the voltage and current available to the circuit. This can cause issues with the oscillator frequency.

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