Jump to content
VWatchie

ETA Calibre 955.112 Service Walkthrough

Recommended Posts

There’s no shortage of service walkthroughs for this and similar ETA quartz calibres on the Internet, and here on WRT. Nevertheless, I thought it would be good fun and educational to create my own walkthrough, and here it is now!

Only having experience of servicing mechanical and automatic movements, I truly learnt that a quartz movement is not “just a time telling battery device”, but indeed a mechanical movement, except that the power source isn’t a mainspring but a battery and that the escapement is made up of electronics (no escape wheel, pallet, and balance). So, just like a mechanical movement, a quartz movement has a train of wheels, a setting mechanism, a dial train (motion works), and in this case calendar works.

The watch belongs to my father who got it as a gift from my mother at his 40th birthday in 1979 (41 years ago!). He asked me if I could fix the crown which had come loose from the stem. So, I glued the crown back to the stem using Loctite 638. Perhaps not the ideal glue but at least the crown will never come loose again. Anyway, I thought to myself; why not try and give it a complete overhaul!? After all, it had never been serviced and I wanted to learn more about quartz watches and return a perfectly working and clean watch to my much-appreciated dad.

One of the things that surprised me while taking this movement apart was that the parts are very small. Smaller than the parts in an averagely sized mechanical movement and that was a bit of an extra challenge. So, before servicing a quartz movement I think it’s a good idea to gain some experience servicing a few averagely sized mechanical movements first.

Both the disassembly pictures and the assembly pictures basically mimic and complements @Mark's videos How to service a quartz movement. ETA 955 412. Watch repair tutorials” and How to service a quartz movement. Part 2. Assembly. ETA 955.412” which I used for guidance (Thank you!). However, my walkthrough includes lubrication suggestions according to ETA’s technical communication which are intentionally omitted in the videos to save time. For reference I also used the video Quartz Service ETA 955.112, @HSL's quartz movement walkthrough, and @Lawson's walkthrough (Thank you!). All part names I’ve taken from ETA’s technical communication.

So, without further ado.

ETA Calibre 955.112 Disassembly

IMG_3082.thumb.JPG.0353fe2826a2a11bd538de4db7b51671.JPGIMG_3083.thumb.JPG.838730984296277daf8f8c82bac9a953.JPGIMG_3084.thumb.JPG.a70d05341f88aab887bc0d354703f74c.JPGIMG_3087.thumb.JPG.f2fe2ccd728ea6ca705bea74c6852571.JPGIMG_3088A.thumb.JPG.92524ed0453907db5f4c35c09c676974.JPGIMG_3088B.thumb.JPG.9b67a9cf6cad3653218e0b95ffe8d8b5.JPGIMG_3089.thumb.JPG.eb7e8eeef5cad404eec312c049c79bac.JPGIMG_3092.thumb.JPG.f2f1a16a14248f65a4f4909ea25d2884.JPGIMG_3093.thumb.JPG.532244ab0312d9c0b8217766ab3bb41c.JPGIMG_3098.thumb.JPG.db96bb98c8e94e2617565edd0fbb4eba.JPGIMG_3101.thumb.JPG.14a66b8b109cffc7b5c943f95f19d47f.JPGIMG_3103.thumb.JPG.b5eed4c42fb4707f8c9d82313994d707.JPGIMG_3104.thumb.JPG.260e0e2f732ee79f7746778a2b1f46c3.JPGIMG_3105.thumb.JPG.877f7e262f7fb49fc4e4d3e12beea307.JPGIMG_3107.thumb.JPG.a6b6bf5eed4f7764259dd954eda00121.JPGIMG_3108.thumb.JPG.554cbb09c5f5fab8ff047b330a5752c3.JPGIMG_3109.thumb.JPG.40fe2010f61964e36c6cc1dcb5c5623d.JPGIMG_3112.thumb.JPG.c498b672b276f1fe8523a07898c70d40.JPGIMG_3114.thumb.JPG.7cf75268b311c918e42880a3c7d74926.JPGIMG_3115.thumb.JPG.58689e50987c3c4ffd1856f2a19f8e90.JPGIMG_3116.thumb.JPG.424a2b4b46001440d83e521194bc0153.JPGIMG_3117.thumb.JPG.edf2abba32238f010380684e628114e1.JPGIMG_3118.thumb.JPG.bd51a28cbf93ac2e57af27215cc3f359.JPGIMG_3119.thumb.JPG.b26ca85cc20ab13d9580e06663908803.JPGIMG_3124.thumb.JPG.8a2aaae36c8937f76d22a0e1571e4847.JPGIMG_3125.thumb.JPG.ff446534c4be5ad1c780943d454199bb.JPGIMG_3126.thumb.JPG.55a10fb632c03bcfaf42704aec1fee4b.JPGIMG_3127.thumb.JPG.cfefb27af324f26b5d01f8c9c7874b98.JPGIMG_3128.thumb.JPG.1e298939ba029ecf47fd73536a2aee73.JPGIMG_3129.thumb.JPG.be4697da41bb4ae1854ddfd5abed1acd.JPGIMG_3136.thumb.JPG.0a5c4dcc0d8ec74724028b74ddcd79e7.JPGIMG_3138.thumb.JPG.1e235a6e405b1bb60e729df64261a462.JPGIMG_3138B.thumb.jpg.3fea4221c726ec3ce49c9bc149de0e2f.jpgIMG_3138C.thumb.jpg.8d90c6dd672b4875c5d736f840b2eb97.jpgIMG_3139.thumb.JPG.e8633edf05027a56ea72562dd262f76a.JPGIMG_3140.thumb.JPG.b456c1096056e7b72b4db528c1c49490.JPGIMG_3141.thumb.JPG.0f209ef5b82c8c71d46ee1e1d69d64e4.JPGIMG_3142.thumb.JPG.c61ead638f8e2dbaeed47e0268f68025.JPGIMG_3143.thumb.JPG.33390491a37ef51beccc6d2c52a857ba.JPGIMG_3145.thumb.JPG.09e1f1029880bcc41e48123fe44beba8.JPGIMG_3148.thumb.JPG.fde5fd162f4258095663aff0bf8fa512.JPGIMG_3149.thumb.JPG.41967f528922c4fc040d7903c06baceb.JPGIMG_3150.thumb.JPG.57f438e0693ac093de86efa958fa9654.JPGIMG_3151.thumb.JPG.31258cf0bda0f06349d002c88c04358b.JPGIMG_3156.thumb.JPG.5d470cb5e2d67a51e2488236cb4cf957.JPGIMG_3157.thumb.JPG.dc7c6a56a54c0dedad6b794688acb329.JPGIMG_3158.thumb.JPG.d8b642c48c6f327c39b95eb541eb041c.JPGIMG_3160.thumb.JPG.c426f02d758a89ef3107ea93dd41ee35.JPGIMG_3161.thumb.JPG.45fff3e7a59652c49f89bcada4e19557.JPGIMG_3163.thumb.JPG.b0dc58180ded735740f4c5928e4d4c07.JPGIMG_3164.thumb.JPG.c68200dde30be18012f6a044193d5ba4.JPGIMG_3167.thumb.JPG.0c4753b1d8006be3204fbbf1c31e30c2.JPGIMG_3168.thumb.JPG.3ebd1d3d4c0bb4ef26e2474417696125.JPGIMG_3169.thumb.JPG.7abbf193bfc1c17dca9ebe2a5aaff782.JPGIMG_3170.thumb.JPG.89d6b7fc3a35c8b510fb9b3019d8b68f.JPGIMG_3171.thumb.JPG.3c3799728abdf281adaf2181d27a86a0.JPGIMG_3172.thumb.JPG.9d86b9d4f9c0354937ab6f603d189731.JPGIMG_3176.thumb.JPG.d6f03762fed4980689dd3d832bd8ee41.JPGIMG_3178.thumb.JPG.1d8c007bd0f4e915737343e3bb6fb524.JPGIMG_3180.thumb.JPG.660cf6edf10197f4574087bd751f7219.JPGIMG_3182.thumb.JPG.a5043262dac2bccb30edd16a21b8872b.JPGIMG_3185.thumb.JPG.1b68e4e0b298a444cd5f57a42e85f857.JPGIMG_3189.thumb.JPG.0db1a97155b1d1f3e4f588d06ead7dd3.JPGIMG_3190.thumb.JPG.86aa411aa70b50a83cf00af52977d339.JPGIMG_3195.thumb.JPG.22ebef01cc640588694bb3bbdcf9e6ae.JPGIMG_3198.thumb.JPG.f6a6b3817e846ae7c2940aeea683669c.JPGIMG_3199.thumb.JPG.96308be71fade224ef15df56e22edde4.JPGIMG_3201.thumb.JPG.13cc5aa3581fbb40a1ab13ceedafd86a.JPGIMG_3202.thumb.JPG.1c562b9961631f9ac4ffef792a2ffc07.JPGIMG_3203.thumb.JPG.a57aecf894887b8d0e322939a898663b.JPGIMG_3204.thumb.JPG.87012986e176cf5a30bcd4e18342bfa6.JPGIMG_3205.thumb.JPG.c41fdf4b4c1f40d10391ef5e386034f1.JPGIMG_3206.thumb.JPG.6ce92b52f50f58de1da5634d4246aa36.JPGIMG_3207.thumb.JPG.36df3bde5c2fa4639b04982380d041d4.JPGIMG_3208.thumb.JPG.43dc003f2a26af24ecdcd1083a0aea73.JPGIMG_3209.thumb.JPG.72d2c4c640b6424cd91dd22a4b3e672b.JPGIMG_3210.thumb.jpg.2056217eb454ff722369fae2f90f992c.jpg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  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.

Loading...

  • Recently Browsing

    No registered users viewing this page.

  • Topics

  • Posts

    • Thats interesting to know. I really only know them from the adverts they used to put on the back of the TV guides selling overpriced pewter items.   I think if you unscrew the screw a few turns to the right of the winding stem in the photo that would release the stem, but looking at your previous photos the other side looks looks pretty rusted so it might be seized.
    • Which model is it? When was it last serviced?   Accutrons are backwards of mechanical watches, in that you have the power source turning the escape wheel, which then powers the train up through the hands. In a mechanical watch there is an increase in speed and a reduction of torque from each gearing to the next, so there is almost no power on the escape wheel. In an Accutron the tiny power and movement of each vibration of the tuning fork is increased by 7 or 8 fold at each gear set, so that at the hour and minute hands there is tremendous power. The instantaneous date system on a 218 model will shake your wrist! And it would stop or hinder a regular mechanical watch.   The upside is a well adjusted Accutron is very reliable and runs for years and years, the downside is that they will run long after the lubrication had dried and grind the pivots to dust. I suspect the friction between the driving wheel and canon pinion has become weak, and the canon pinion and hour wheel are sticky, so the watch runs but doesn't move the hands. As the seconds pinion is before this intersection it continues to move, and the hand setting works since that is another gearing that drives the canon pinion directly.   As it does run, it should just need a service. But the longer it runs in this state the more potential damage that can be done.
    • About an hour and a half, but I have some helpful stuff like a toolmaker's microscope to get the position of the steady pins, screw, and point where it should sit between two teeth, a CAD program I can import an image of an original jumper, trace,  and then scale a traced drawing to size, and a little CNC machine that cuts out the part. The spring section still starts at around 0.15mm and gets thinned by hand to about 0.04 or 0.05, that's where the fun is.
    • I understand this seems to be a common problem related to the canon. Does anyone have any advice or a link to a manual or diagram that can explain how to fix this?   the watch gums fine and when setting it the hour and minute hands move correctly. 
×
×
  • Create New...