Electric WW Bulova Accutron Quart 2431.10 repair

Discussion in 'Watch Repair' started by Monte87, Jun 22, 2020.

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  1. Monte87

    Monte87 Registered User

    Mar 7, 2020
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    working on a Bulova Accutron Quartz 2431.10 movement.

    Trying to find info on this movement - but haven't had much luck.

    Watch won't run with a proper battery installed unless I jump the (-) battery connector to the trace on the board that is physically apart from the connector...

    Should that trace make contact with the connector or is something else wrong?

    - thank you for any light you can shed on this!

    IMG_5972.png
     
  2. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    #2 roughbarked, Jun 22, 2020
    Last edited: Jun 22, 2020
    Where's the battery contact screw?
    Does the contact connect to the circuit?

    Your photo doesn't quite show.
     
  3. Monte87

    Monte87 Registered User

    Mar 7, 2020
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    I didn't have the screw inserted when I took the picture - sorry.

    What you can't see in this pic, is the gold trace on the circuit board under the battery contact and screw. But that trace doesn't have continuity to the long thin trace shown in the picture...
    The battery contact clamp has a prong that sticks down into the hole between the two points I indicated on the picture.
    I think those two points need to make contact but I can't find a picture or example from a working movement...
     
  4. Chris Radek

    Chris Radek Registered User
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    Apr 13, 2014
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    Yes of course they should be connected, because a trace doesn't go clear across a circuit board in order to go nowhere. Especially when it points right to an obvious pad that also isn't connected to anything. Especially when connecting the two makes it work. You did a good investigation, trust yourself!

    Some joker mangled it when changing the battery. You can just solder a little jumper and fix it.

    Here's a picture out of a July 1979 technical letter for the 243 which I'm not sure is exactly what you have, but it looks close, and there's a nice long connected trace there:


    upload_2020-6-23_13-7-3.png
     
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  5. roughbarked

    roughbarked Registered User

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    Yes for soldering a jumper.
     
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  6. whizzer

    whizzer Registered User

    Mar 18, 2008
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    If you are not comfortable soldering circuits you might try silver conductive glue. I've used for a similar problem.
     
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  7. Monte87

    Monte87 Registered User

    Mar 7, 2020
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    Thank you. It all makes sense now...

    The prong that sticks down from the battery clamp must have lined up with a hole on the board to properly orient the clamp. Someone attempting to change the battery must have only loosened the screw - and then forced the clamp to rotate out of the way of the battery... And that must have torn right through the trace and the board!

    I will solder a jumper or try silver conductive glue. Many thanks!
     
  8. Samantha

    Samantha Registered User

    Jun 28, 2009
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    That was a common problem with inexperienced people changing the battery in a 243. They wouldn't loosen the screw enough and the tab on the cell strap would cut that trace. Those were good movements, similar to the 245 series, but not interchangeable. Please post if you do or do not have success in repairing the circuit. It's not in your picture, but there should also be a magnetic shield that covers the movement.
    Samantha
     
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  9. Monte87

    Monte87 Registered User

    Mar 7, 2020
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    I soldered a tiny wire across the gap in the trace... The watch was running so I installed the protective film and then the magnetic shield. I left the watch running on my bench overnight but this morning it had stopped.
    The battery was drained but a new one didn't make the watch run.

    What is the proper cell for this movement by the way?
     
  10. Chris Radek

    Chris Radek Registered User
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    It's a Bulova 247, which is a modern day 384.


    upload_2020-6-26_12-29-4.png
     
  11. roughbarked

    roughbarked Registered User

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    Anyway it only has Bulova written on it. It isn't an Accutron but it is a Citizen. Yes I know that Citizen own Bulova and they are only putting the name on it because of the American market.
     
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  12. Samantha

    Samantha Registered User

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    A good cleaning may take care of it. Those were good movements and didn't usually have many issues (the most common issue that I would see with them was that trace being cut.
    Samantha
     
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  13. Monte87

    Monte87 Registered User

    Mar 7, 2020
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    Thanks - I will give it a good cleaning and post how it goes!
    I will be on vacation for a bit so I may have to finish this repair in a few week...
     

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