I have a watch I would like to fix my self. It's made by TAWATEC, who is no longer in business. It's very similar to a Luminox and used TGS for lume. I will provide information to the best of my ability.
Here is a link to some information about it. Here are a few pictures of the watch.
I have had the watch since May of 2011. I had the battery replaced in Feb 2015 by a local shop. Less than a year later, I noticed that after taking a shower there was condensation under the crystal. I pulled the crown and left it sit to air out. After about a week I pushed the crown back in and the watch no longer worked. I wondered what caused it to leak. I then remembered I had to change the date on the watch a few days before condensation had got inside the watch. When I was trying to set the date I noticed that it was difficult to pull the crown out and it was more difficult to turn than usual. My guess was that the gasket/O-ring that is on the stem/crown was messed up and had ripped and water had entered that way. I left the watch sit for a year and used another watch as my daily driver. I'm hoping to get this one up and running again. So I recently decided to see if I could fix the watch myself.
Here is what I have done and have figured out so far...
I was able to remove the case back by removing the 4 Phillips screws. Visually inspecting the O-ring that seals the case back, everything looks good. The movement is a Ronda 515. The plastic ring that holds the movement inside the case says Ronda 515 # 6. I was able to remove the crown and stem. Looking towards the inside of the crown there was remnants of the O-ring. After clearing the remnants and putting the crown back in, the crown moves freely. I also found remnants if rubber on the front of the dial. After inspecting the battery, it looks to have leaked its electrolyte What I would like to do first is replace the O-Ring that's on the crown and put a new battery in it. If I then determine that the movement is damaged, I can replace it later.
What do I need to do to figure out what size of O-ring I need for the crown? I can take pictures of the crown/stem if needed. I also have analog calipers to use that are in inches.
Thanks for your time!
It's my first post here, please excuse if I post to the wrong sub-forum.
I own a small collection of quartz and automatic watches and at least do most of the usual service myself.
A friend of mine gave me an old watch she likes and asked me if I can change the battery. She told me it's around 25 years old and cheap but she likes the dial. It was a present by a french bank she worked for.
All my watches are either press or screw down backs and I have never seen a watch like this. It seems that the only possible way to open the watch is the small plastic notch on the back. I tried to open it with quite some force but it didn't open.
Do I overlook something, is there a special way to open it?
I also got the original case. A note in it says in french that the battery is interchangeable.
Already thanks for all your help!
I agree with what you are saying completely. I plan to only keep the case and back and replace everything else. I would have loved to put a mechanical movement in the watch but I think it’s too small (33.9mm x 7.1mm).
My plan is to have the case and back replated and have the back blanked of its manufacturers engraving so as I can have a blank canvas to have something engraved on it myself. I was hoping to get advice on what movements could be used and buy the parts ready for a watchmaker to assemble as like you said, I don’t want to ruin the watch.
I’ve already started sourcing/ordering parts which was a little silly without any advice so I’ll post what I have ordered below (if rules permit me to do so?).
I have one of these in for service, cant figure out why the hour hand does not go round when time is set.
The hour hand sets OK although sometimes it clicks every hour and other times it runs smooth.
The minutes and seconds function fine even when setting the time.
Maybe a problem with the magnetic wheel on the date set?
I looked under the microscope and it looks like the 2 part magnetic wheel on the date side is only rotating on the bottom half and not transferring the force to the top half to the hour wheel.
Any ideas on how to remedy it and get her going again??
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Thats incredibly bad news. I was sure that this would not happen with the genuine article. I didn't order from Cousins and it will probably be a hassle for me to complain.
And the official answer from Bergeon is the worst. When you are a customer who has paid good money for a product that is defective, you do not want to hear "Well, we acknowledge that there is an issue with your product that renders your purchase useless, but other people have not complained, so you should be fine"
Hey guys! Great information here. Teaching myself some basic watch maintenance. Really just starting out. Bought this with a view to "learn by doing". It wasn't winding when I started. Had an amazing time taking it apart and examining the parts. The hairspring seemed bent so I had a go at shaping it and damaged it even worse. The study came off and was lost, then part of the spring knotted ... Argh. I'm murdering this watch I know! I'm having a really tough time finding a compatible replacement. The parts chart says that the balance is "different from basic calibre 100" and to "refer to catalogue GF 239". I can't find any document by that name. If I could get some help it would be appreciated!
Yes I bought them from Cousins. This is what Bergeon replied to them: It's probably the friction of the white lid material coating flaking off. Yes I can see that it could happen but frankly I don’t think it’s a big issue. After a few operations you can clean it and it’s done. We are selling a huge amount of these oil cup and never had any complains. So they know about the issue but have no intentions to do anything about it. Cousins didn’t like the outcome and have gone back to them again. So I’m still waiting.