Jump to content

Braun 4 821 alarm clock with no alarm :(


rappeleur

Recommended Posts

Hello,

 

I know, this is not the usual watch/clock type you are working and discussing on here, but: I have a wonderful old Braun 4821 alarm clock with a complete stutterfree second hand (a dream to watch). The only thing: the alarm doesn’t go off. It clicks - and: silence. Battery is new. The "movement" has the numbers 4 809.

I also know that these models weren’t made to ever be repaired and it is no big problem that the alarm is silent, as the time is shown properly. But I wanted to know if one of you out there might have a clue if I can just clean a contact or something else?

 

Thanks in advance!

 

20180202_143132.jpg

20180202_143305.jpg

Link to comment
Share on other sites

This is not my field when it comes to clocks. I used to restore mechanical clocks.

The only thing I can suggest is try to get to the movement and clean the contacts. This type of clock movement are just throw away when they pack up. Sorry I cannot be more helpful.  

 

Link to comment
Share on other sites

  • 2 years later...

I never understood why alarms sound so terrible. Every one of you heard this sound and it's just awful. I also never liked to put a bug on the phone because it is very easy to turn it off. That is why I love using bluetooth wake-up calls. This is really very convenient. I found the  best models of bluetooth alarm clocks on the Internet on the Internet and decided to download them. As a result, I started to wake up much faster and my son became more stable. So the bluetooth alarm clock helped me normalize my sleep pattern. By the way, here you can find a detailed overview of each model!

Link to comment
Share on other sites

  • 2 years later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Oh nice. I have a similar wedge style stump for my staking tool, so I'll give that a shot. Thanks!
    • Thank you all for the replies!  Very informative! True enough, the Gamsol took some time to evaporate and does leave a residue. So not all naphtha are created equal!  Need to find alternatives then. i was able to try Hexane recommended by Alex and it seems great.  I wonder what the cons are?
    • Yeah, I saw that in the tech sheet but I don't see how it can be adequately cleaned with the friction pinion still in place. I've accidentally pulled the arbor right out of the wheel once when I used a presto tool to try and remove it. Mark shows how he does it with the Platax tool. Those are a little too pricey for me so I got one of these from Aliexpress and I just push down on the arbor with the end of my brass tweezers. That usually gets it most of the way out and then I just grab the wheel with one hand the and the friction pinion with the other and gently rotate them until it pops off. Probably not the best way but it's seemed to work for me so far.    
    • Thanks, Jon Sounds like a plan. Obviously I'll have the face on so do you think gripping with the holder will create any problems, but I will check in the morning to see how feasible it is but I assume it only needs to be lightly held. As for holding the movement instead of the holder won't be possible in this scenario as one hand will be puling on the stem while the other pushes the spring down. That was my initial concern is how the hell can I do this with only one pair of hands. All the other times I've had to remove the stem hasn't been a problem, apart from the force required to release the stem from the setting lever, but now I need to fit the face and hands its sent me into panic mode. If it had the screw type release things would be a lot simpler but that's life 😀   Another thing I will need to consider is once the dial and hands are fitted and the movement is sitting in the case I will need to turn it over to put the case screws in. I saw a vid on Wristwatch revival where he lightly fitted the crystal and bezel so he could turn it over, is this the only option or is there another method?      
    • Hi Jon, do You think that relation spring torque - amplitude is linear? I would rather guess that the amplitude should be proportional to the square of the torque. I had once idea to check it, but still haven't.
×
×
  • Create New...