Resetting New Asian 7750

[Rolexman]

Hi Zig,

The new Asian 7750 in my Breitling for Bentley GT runs perfect but when I push the reset button (after pushing the 'start/ stop' off course) the second hand of the chronograph and the minute counter jump to +- 10 o'clock and when I release the 'reset' button they jump to zero (this happens very fast in less than a second). The hands don't slip as they always reset to the correct position pointing perfectly upwards.

So the chronograph feature works perfect and resetting to zero is also no problem. I was just wondering if something is wrong with the movement because of it's strange behaviour.

Maybe it's normal or a flaw in the design??

Thanks

UPDATE: My BCE has the same problem, see last post.

Edited May 10, 2007 by Rolexman

[jeff g]

I know that it is a common problem on many 7750's.

I believe there is a 'Fix' for it. (other than having to have the movement removed).

But if there is such a fix I don't know what it is.

[RWG Technical]

When you press the bottom pusher to reset the movement, it does two things, 1. it presses against the chrono Cam and moves it to the reset position, and 2. it pushes against the 12 hour reset lever and resets the 12 hour counter to "12".

When the button is pushed, the Chrono Cam should go to the reset position immediatly, and the hammer should position the seconds and minute counters to "12". It works like a switch. The 12 hour wheel is not a switch, and if you press slowly you can actually move the 12 hour slowly to "12".

It sounds like the Chrono Cam is not resetting instantly, but it's jamming up, until you release the button when both hands go to "12".

Not sure why it's doing this, could be a number of reasons... I don't remember seeing this before so I am not sure what the fix would be.

As long as the hands reset to "12" after the button is released, it should be fine...

RG

[Rolexman]

Thanks Zig... I don't exactly know what the chrono cam is but it sounds to me like it's time for an overhaul. This should/ could solve the problem I think.

[Rolexman]

Well ... I just received my graphite Evolution and it does the exact god damn thing as my GT. The chrono cam is jamming up! The chronograph minute and second hand don't instantly jump to zero when I press the reset button (only after I release the reset button).

Bummer!!

[kingkitesurf]

Funny I just received my Scuderia Ferrari 008 with Asian 7750. Does the same resetting thing. I don't care it looks good to me because I have e gen Valjoux 7750 IWC from 81 that has also the same thing. It overpulls when resetting and then goes back to 0 when released. Feels very solid to me.