Jump to content

Junghans Dato-Chron stops running - every evening...


Recommended Posts

Hello at all,

 

my Junghans Dato-Chron stops ticking every night at 10 p.m. First assumption: the date change comes into gears and needs to much energy the battery or gearwork cannot provide.

 

Question: Is this more likely due to a weak battery (a fresh battery is in the watch, although not the original "mallory wh3" - what is the closest match in modern batteries? I took a LR43 = V12GA = AG12 - 301 = 386 = SR1142 = SR43 battery with 1,5 V which generally should work well. Or is this mostly due to a dirty movement and a service is the only way to keep the watch running (even at night)?

 

 

Thanks for suggestions!

Link to comment
Share on other sites

4 hours ago, rappeleur said:


Question: Is this more likely due to a weak battery (a fresh battery is in the watch, although not the original "mallory wh3" - what is the closest match in modern batteries? I took a LR43 = V12GA = AG12 - 301 = 386 = SR1142 = SR43 battery with 1,5 V which generally should work well.

Just try a different brand from what is in there now.
You can try to feel the force needed to date change by advancing the time manually. 

Link to comment
Share on other sites

yes, there is a tiny little increase of force needed when proceeding beyond 10 pm :)

I will try another brand of battery for this is the most easiest way to exclude one of the two reasons...  The above mentioned type is ok?

Edited by rappeleur
Link to comment
Share on other sites

  • 1 month later...


  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • yes I noticed the new site and I miss the old site. It's the unfortunate problem of the Internet here today gone tomorrow sometimes some of the stuff gets backed up and sometimes well it does not then the problem with the early Seiko's were there were not necessarily designed for distribution across the planet and as such there is no customer support for them. So trying to find early stuff like technical information or sometimes even parts list for older Seiko is is problematic. But I did find you a you tube video. A quick look he seems to take a heck of a lot of time to actually get to the service single I did not watch all that but it does look like he did disassemble or started to say there's a tiny bit here  
    • RichardHarris123: Hello and welcome from Leeds, England.  I have family all over Australia, went as £10 poms Thanks Richard. Hope you’re able to visit your family here and that they’ve all done well 🙂 My relatives arrived from England in the 1790s transported on the ‘Second & Third Fleets’—a story of timber sailing ships, of convicts and doing well in this huge Country of Australia. When I visited the UK in the 1980s, I was too young to comprehend the depth and breadth of its history…  Best wishes, Mike William Chapman, my 4th great Grandad’s charges, at age 23 read at the Old Bailey; sentenced to 7 years of transportation to Sydney.
    • The whole process and the progress are closely observed, it's hand-driven and very controlled. I can't see the "danger", unless you are watching the TV while doing it. As you could have read, and in this quote "wheel" is the balance-wheel.
    • Have you got the pallet fork installed in the movement when you see the train move when using the setting works? As nevenbekriev said, without the pallet fork to lock the train, the behaviour you are describing is normal. If this is happening with the pallet fork installed, you have a problem in the gear train, it should be immobile when the pallet fork is locking the escape wheel.  The fit of the circlip above the pinions on that wheel is crooked in your pictures, it should sit flat up against the upper pinion as in Marc’s picture.  Hope that helps, Mark
    • Hi I got a Jaeger LeCoultre K911 movement, where one of the stems was broken. Part no. Should be 401.  Im based in Europe and tried Cousins but its discontinued. They except to get stem in stock for cal. K916 but will that work? Or Is there a way out to join the ends?
×
×
  • Create New...