Jump to content

Movement 798.002


Recommended Posts

Anybody in the group know I can download a tech sheet on this movement?  In the process of disassembling this movement.......it runs but it’s losing time.............. l am learning by  taking apart cleaning and oiling and putting back tOgether certain movements.......

Link to comment
Share on other sites

Hi with the takeover of the ebauches , and various other swiss watch companies By the SWATCH group the information on ETA watches is now getting harder to obtain unless you are a purchaser of their products.  The ETA tech data Base is now enclosed within that realm. Trade Only

Link to comment
Share on other sites

The 978.001 is practicaly the same as the 978.002 and is an obselete movement.
I dont have the tech sheet for this but as it came in many shapes one could use a third party manual like this.
http://watchreserve.com/bulova-281010

Certina 133 is the same movement to
IMG_20200406_165435.thumb.jpg.2fe45979a16fa33e9a78fff8c97b2fa2.jpgo.

Or why not just replace it with this one.

https://www.esslinger.com/harley-ronda-2-hand-quartz-watch-movement-hq751e-hq978-o-a-3-7mm-to-replace-eta-978-002-and-eta-578-004/

The only downside is the dial is not always compatible with the Ronda movement.

Edited by HSL
Link to comment
Share on other sites

Took a look at this mystery, it seems no tech sheets are availible for this one so the close match and recommended replacement seemed to be the 976.001, but there are quite obvious differences in these two movements so they are not 100% the same but really close. Found some specimens in the bin to show the differences.

Scrap1.thumb.png.45fbd3f9a977bd8724c6dc5bf71e4707.png
 

Scrap2.thumb.png.066769757cb5a7b07f5fd31dc0ad600e.png

As expected the 978.002 only shovs the mechanical outlines at ETA.
https://shopb2b.eta.ch/978-002.html

But for the 976.001 they have the whole techsheet shaboom.
https://shopb2b.eta.ch/976-001.html#description
https://shopb2b.eta.ch/976-001.html#technical-documents
So you probably have to go with the 976-001 for this one.

 

 

Link to comment
Share on other sites

22 hours ago, HSL said:

Took a look at this mystery, it seems no tech sheets are availible for this one so the close match and recommended replacement seemed to be the 976.001, but there are quite obvious differences in these two movements so they are not 100% the same but really close. Found some specimens in the bin to show the differences.

Scrap1.thumb.png.45fbd3f9a977bd8724c6dc5bf71e4707.png
 

Scrap2.thumb.png.066769757cb5a7b07f5fd31dc0ad600e.png

As expected the 978.002 only shovs the mechanical outlines at ETA.
https://shopb2b.eta.ch/978-002.html

But for the 976.001 they have the whole techsheet shaboom.
https://shopb2b.eta.ch/976-001.html#description
https://shopb2b.eta.ch/976-001.html#technical-documents
So you probably have to go with the 976-001 for this one.

 

 

I found a ETA movement out of  Canada that sells the 978.001 movement for 78$... Thanks for the advice

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • It looks like the canon pinion function is part of this great wheel. The pinion nearest the clip runs the minute wheel on the dual side. The pinion nearest the wheel is driven by a small wheel from under the setting lever cover plate that engages in hand setting position.    So when assembled the crown was driving the whole great train. Does this mean the pinions are too tight? Should I attempt to disassemble this great wheel and lubricants?
    • Picking up this side-tracked post again as I just removed a balance staff of a 1920's Omega (35,5L-T1) I was impressed by the way @Delgetti had his setup when he had to change out a balance-staff (https://www.watchrepairtalk.com/topic/28854-new-balance-staff-not-riveting-to-balance/page/2/#comment-244054 Not only that, but also the idea of removing the seat first before punching the staff out from the seat-side, avoiding the whole discussion of the rivet yes/no enlarging the hole. I didn't have the fancy clamps & tools Delgetti has, so I used my screw-head polishing tool. Initially I used #1500 grit diamond paste on the steel wheel, which kinda worked, but very slow. I changed to #800 grit diamond paste, which worked better, but still slow. Then I glued #240 sanding paper to the steel disk; That worked and the disk was hand-driven. Once close to the balance wheel, I took the sanding paper off and continued with #800 diamond paste. One can only do this when the balance wheel sits true on the staff and has no "wobble". I went on grinding until I saw some diamond paste on the rim of the balance wheel. This was as far as I could grind and it seemed that there wasn't much left of the seat. Carefully, with my staking set, I knocked the staff from the seat-side out. Turns out that the thickness of the seat left, now a small ring, was only 0.1mm. The balance wheel hole is in perfect shape and no damage done to the wheel at all. Of course, if the wheel has a "wobble" or isn't seated true on the balance staff, you can't get as close and there will be more left of the seat. In my case, it worked perfect 🙂 I'm very happy how this method worked out ! 😊  
    • As is tradition, one step forward, two steps back. Got the board populated and soldered into place without any issues.   But no hum. So I started testing the coils with an ohmmeter. I got 5.84k ohms across D1 (from red to red in the picture below), which is as expected. But I'm getting an open circuit for the other drive coil and feedback coil, D2 and F1 (from green to each of the two yellows).   Since the movement was working with my breadboard setup, it implies I somehow broke the connection between the coils and the solder lugs. They're all the way at the bottom of the lugs, but maybe the heat migrated down and broke the connections? I guess it's possible it happened while cleaning the flux off, but I used a soft artist's brush and isopropyl alcohol. I did a lot of high magnification examination, and I don't see any issues, but let me know if you see anything I missed or if you can think of anything else I should check.
    • 1947 NOS Ambassador 'C'. Actually, the case came without the movement so the movement isn't NOS, but she sure is pretty.
    • Hi attached is the AS 20XX. Service sheet although there is no 2063 mentioned it may be of some use to you AS_AS 2060,1,2,6,4,6.pdf
×
×
  • Create New...