Jump to content

Recommended Posts

Posted

Hi folks

I have a cheapie rolex homage with chrono functions. The movement inside is probably an a7750 (opened once a few years ago and can't remember exactly).

Recently, I tested the chrono function and the chrono started but would not stop, ie, when I press down on the stop chrono button, no click sound is heard and it does nothing to stop the chronometer. Same thing when I tried on the reset chrono button, no click sound neither.

Can anyone kindly advise what can be done by myself (a newbie) or any quick fix please.

Thanks a lot. :)

Posted

Hi folks

I have a cheapie rolex homage with chrono functions. The movement inside is probably an a7750 (opened once a few years ago and can't remember exactly).

Recently, I tested the chrono function and the chrono started but would not stop, ie, when I press down on the stop chrono button, no click sound is heard and it does nothing to stop the chronometer. Same thing when I tried on the reset chrono button, no click sound neither.

Can anyone kindly advise what can be done by myself (a newbie) or any quick fix please.

Thanks a lot. :)

Any advice please?

Thanks

Posted

Its probably a Chinese copy of a 7750, terrible movement but good to learn on.

Yes. Very highly likely an Asian clone of 7750.

I am thinking of opening it up and check the chrono button. If anyone has any advice on what to look out for, it would help and I would be much appreciative please.

Thanks in advance

Posted

Anyhow, how about anything on the chrono issue I have please? Any help?

One can't know without looking. To set expectation rights, chrono is all about levers and springs and is considered advanced watchmaking, plus spare parts for Asians movements are practically impossible to get. Of course you could be lucky and able to sort it out easily.

  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Well, my fundamental stance is that I want to go in and out without leaving any trace other than a shining, perfectly running movement. So, no scratchings on the inside of the case back lid, no marred screws, no debris, no fingerprints, and so on. That is, my goal is to make it impossible for the FBI to track me down. As a professional, I suppose you might want to keep track of returning watches, but as @JohnR725 mentioned, we can keep detailed computer records without marking the watch at all. That may not be true for every watch, but luxury and COSC-certified movements do have unique numbers. John also says it’s best to leave no sign you were ever there, and I couldn't agree more. Now, suppose the Sea-Dweller I'm working on is one day scrapped, and you want to sell the case-back separately (perhaps the case was destroyed in a plane crash). Then the scribbles on the inside no longer reflect the current movement inside the case. Also, the engraving will likely halve the market value of the case back. It had been "sleeping" for about a week and a half. Yes, the "debris/old lubricant" theory is my hypothesis as well! It will be interesting to see what I find once I have time to start disassembling the movement.
    • I've repaired a few of these, having some success with stripping and cleaning the mechanism.  They are so cheap though, its hardly worth the effort in many cases.
    • Get well soon Old Hippy, torn muscles.,  not good
    • Id love to see how he has the output shaft mounted to this setup, as I have the same rotary stage and stepper in my build.
    • If you see at least one thread protruding, or even a half, then you may have a chance using this "tool", but don't squeeze hard. Lot's of patience, and if you notice any signs of loctite or other adhesives, then apply several drops of acetone on top of broken stem. Use heat (hair dryer) also. You should be able gradually turn it counterclockwise, just like i did on this broken Timex stem, which was glued with something like nail hardener. Then you can use an extender to save your broken stem. https://m.media-amazon.com/images/I/513DVvkfW5L.__AC_SX300_SY300_QL70_ML2_.jpg   You can also try cutting a small grove / slot on top of the broken stem to use 0.7mm flat screwdriver.   Depending on the Crown material and Stem material, you can try dissolving the stem. 
×
×
  • Create New...