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Eta 251.626 Service Walkthrough - The High-End Quartz Chronograph

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ETA 251.626 Service Walkthrough

 

The 251.626 is often found in mid to high-end quartz chronographs on the market today.


 

post-246-0-21774900-1433954377_thumb.jpg

 

It is a fairly complex quartz movement that has 5 motors, 2 with Red Coils, and 3 with Green Coils.

 

post-246-0-14247600-1433954380_thumb.jpg

 

To begin the service we start by removing the 3 Indicator Maintaining Small Plates, and Date Indicator.

A 1.4mm screwdriver is all the is needed for every screw on the movement.

 

post-246-0-09554900-1433954383_thumb.jpg

 

Here's a reference photo of the 3 screws for the Indicator Maintaining Small Plates.

 

post-246-0-36034400-1433954384_thumb.jpg

 

There are no more components to remove from the dial side of the movement.

 

post-246-0-80004400-1433954386_thumb.jpg

 

Once the movement is turned over, remove the 2 screws that hold the Magnetic Screen.

Once the Magnetic Screen is removed all the coils are very exposed, so work around these coils with great care.

 

post-246-0-13135500-1433954389_thumb.jpg

 

Here's a reference photo of the 2 screws for the Magnetic Screen.

 

post-246-0-29249400-1433954390_thumb.jpg

 

Next unscrew the 6 screws holding the Additional Printed Circuit and gently lift it off the movement.

Store the Additional Printed Circuit away separately and safe from the rest of the parts.

 

post-246-0-42061700-1433954393_thumb.jpg

 

Here's a reference photo of the 6 screws for the Additional Printed Circuit.

 

post-246-0-22637900-1433954396_thumb.jpg

 

Next we tackle the 2 trains with the red coils.

Right Side - Minute Counter

Left Side - Hour Counter

 

post-246-0-57264900-1433954399_thumb.jpg

 

The right and left trains contain different size wheels and should be kept separate for ease of assembly.

We shall start with the right side.

Remove the Minute Counter Bridge

 

post-246-0-00752700-1433954417_thumb.jpg

 

Next remove the Gear Train and the Rotor.

 

post-246-0-42856200-1433954420_thumb.jpg

 

Next remove the Coil and Stator.

Store the Coil away separately and safe from the rest of the parts.

 

post-246-0-55128100-1433954422_thumb.jpg

 

Here's a reference photo of the components and their corosponding screws.

Note the 4 spokes on the Minute Counting Wheel.

 

post-246-0-13643400-1433954424_thumb.jpg

 

Remove the Hour Counter Bridge.

 

post-246-0-11602700-1433954427_thumb.jpg

 

Remove the Gear Train and the Rotor.

 

post-246-0-85882700-1433954430_thumb.jpg

 

Remove the Coil and Stator.

Store the Coil away separately and safe from the rest of the parts.

 

post-246-0-24189500-1433954433_thumb.jpg

 


Here's a reference photo of the components.

Note the 3 spokes on the Hour Counting Wheel.

 

post-246-0-22417400-1433954436_thumb.jpg


 

Store these 2 trains in separate sections in your parts tray, and when cleaning store them in sparate parts containers.

 

post-246-0-19966200-1433954438_thumb.jpg

 

Next remove the Chronograph Bridge

 

post-246-0-46726000-1433954442_thumb.jpg

 

Now remove the Chronograph Wheel

 

post-246-0-59133900-1433954460_thumb.jpg

 

Unscrew the Green Coils and remove them.

Store the Coils away separately and safe from the rest of the parts.

 

post-246-0-88505800-1433954463_thumb.jpg

 

Here's a reference photo of the components and their corresponding screws.

 

post-246-0-98828700-1433954465_thumb.jpg

 

Remove the Train Wheel Bridge.

 

post-246-0-07090400-1433954469_thumb.jpg

 

Remove the Wheels of the Train.

 

post-246-0-66960800-1433954471_thumb.jpg

 

This is quite a complex train of wheels.

So to assist you I've cleaned up the rather cluttered schematic supplied by ETA and colour coded each wheel and it's location on the Main Plate.

 

post-246-0-14950200-1433954475_thumb.jpg

 

Here's a reference photo of the top of the wheels, also colour coded to assist you.

 

post-246-0-82163000-1433954477_thumb.jpg

 

And also the underneath of the wheels, also colour coded to assist you.

 

post-246-0-19681100-1433954480_thumb.jpg

 

Remove the Rotors and Stators.

 

post-246-0-49106400-1433954482_thumb.jpg

 

Unscrew the 3 screws that hold the Upper Plate and remove it.

 

post-246-0-72413100-1433954484_thumb.jpg

 

Here's a reference photo of the Upper Plate, Connector, and the corosponding screws.

 

post-246-0-20291200-1433954503_thumb.jpg

 

This now exposes the Electronic Module.

 

post-246-0-09830100-1433954507_thumb.jpg

 

Remove the Stop Lever/Switch

 

post-246-0-67983800-1433954509_thumb.jpg

 

Remove the Cannon Pinion with Driver.

 

post-246-0-16410600-1433954512_thumb.jpg

 

Then remove the Electronic Module.

 

post-246-0-43750900-1433954514_thumb.jpg

 

Pull out the Stem and Sliding Pinion.

Now store the Electronic Module away separately and safe from the rest of the parts.

 

post-246-0-20788400-1433954517_thumb.jpg

 

Remove the Minute Wheel, the Hour Wheel, and Contact Intermediate Wheel.

 

post-246-0-79851500-1433954519_thumb.jpg

 

Before we can remove the Date Indicator Driving Wheel, we need to pull back the Date Jumper.

Gently lift the tab (Yellow Arrow) until it's at plate level and pull it backwards.

This will pull the arm of the Date Jumper back and allow you to remove the wheel.

 

post-246-0-90690800-1433954523_thumb.jpg

post-246-0-98883400-1433954526_thumb.jpg

 

Here's a reference photo of the wheels.

 

post-246-0-95711000-1433954529_thumb.jpg

 

Lastly we need to remove the keyless work.

Unscrew the Setting Lever Spring and then remove the Setting Lever, Yoke, Driving Wheel, Internediate Setting Wheel No.1, and the Setting Wheel

 

post-246-0-99477000-1433954545_thumb.jpg

 

Here's a reference photo of the Keyless Work.

 

post-246-0-67346700-1433954548_thumb.jpg

 

The movement is now completely disassembled.

 

post-246-0-97646300-1433954550_thumb.jpg

 

I hope you've enjoyed this disassembly walkthrough and found it's given you the information and confidence to tackle this tricky but rewarding quartz movement.

I will post the assembly procedures tomorrow, Lord willing :)

 

post-246-0-32007600-1433954553_thumb.jpg

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Lawson, when do you find time to sleep?

I know how long it takes me to put together a walk through and mine have only a fraction of the detail that yours do.

This is yet another excellent publication, many thanks for time and effort that you must put into them.

Your photography and presentation are absolutely of the highest.

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ETA 251.626 Service Walkthrough

Part 2

 

Assembly

 

We begin the assembly with the keyless work.

 

post-246-0-43133600-1433997578_thumb.jpg

 

Fit together the Setting Lever and Setting Lever Jumper.

 

post-246-0-20198200-1433997581_thumb.jpg

 

Then install the Driving Wheel, Intermediate Setting Wheel No.1, and the Setting Wheel

 

post-246-0-86640100-1433997583_thumb.jpg

 

Install the Yoke

 

post-246-0-52776400-1433997586_thumb.jpg

 

Then slide the saddle at the end of the Setting Lever Jumper Arm into the groove in the Intermediate Setting Wheel No.1.

You will have to then lift the Intermediate Setting Wheel No.1 slightly to position the Setting Lever Assembly as shown below.

 

post-246-0-75059400-1433997588_thumb.jpg

 

Then locate the Setting Lever and Jumper onto their respective posts and slots.

Once screwed down engage the position arm of the jumper onto it's post on the Setting Lever.

 

post-246-0-07645900-1433997591_thumb.jpg

 

Next install the Date Indicator Driving Wheel.

Remember that you need to slide back the Date Jumper

 

post-246-0-43849900-1433997594_thumb.jpg

 

Once the Date Jumper is back in position check that the spring arm is once again down in it's correct position.

 

post-246-0-96436400-1433997596_thumb.jpg

 

Install the Contact Intermediate Wheel, the Hour Wheel and then the Minute Wheel.

 

post-246-0-47150000-1433997599_thumb.jpg

 

Replace the Electronic Module, then fit the Sliding Pinion and the Stem.

 

post-246-0-77889800-1433997601_thumb.jpg

 

Install the Cannon Pinion with Driver.

 

post-246-0-53360700-1433997621_thumb.jpg

 

Replace the Stop Lever/Switch.

 

post-246-0-18071500-1433997625_thumb.jpg

 

Then gently place the Upper Plate back on the movement, making sure the Yoke and Setting Lever are positioned correctly, and that you do not disturb any of the other components underneath.

 

post-246-0-89920800-1433997627_thumb.jpg

 

Refit the bank of Stators and Rotors which have the Green Coils.

 

post-246-0-49098400-1433997630_thumb.jpg

 

Now we come to the trickiest part of this service: installing the Main Gear Train.

 

post-246-0-79567800-1433997947_thumb.jpg

 

To assist in the order in which to install the wheels I will give the part numbers, and colour code the text, to match that of the diagram above.

Start with the Third Wheel [210].

 

post-246-0-92505100-1433997632_thumb.jpg

 

Then the Additional Intermediate Wheel [204]

 

post-246-0-33655900-1433999408_thumb.jpg

 

Then the Second Wheel [224]

 

post-246-0-24413700-1433997637_thumb.jpg

 

Then the Intermediate Wheel [203]

 

post-246-0-82581800-1433997639_thumb.jpg

 

Then the Driving Wheel for Second Counter [8059]

 

post-246-0-03672500-1433997642_thumb.jpg

 

Then the Driving Wheel for Chronograph Wheel 60s [8060]

 

post-246-0-62638900-1433997644_thumb.jpg

 

And lastly replace the Counting Wheel for Seconds or Minutes [8027]

 

post-246-0-58565800-1433997666_thumb.jpg

 

Once the train is in place, take some time to tweak the wheels so that are standing up as straight as possible.

 

Remember that you have 10 pivots to align with their respective jewels, so taking some time to position the wheels and rotors now can save you a LOT of frustration fitting the Train Wheel Bridge.

I would go so far as to take a little break, have a drink, relax your muscles and mind before proceeding to the next step.

 

Fit the Train Wheel Bridge and align all the pivots to their jewels, and check the free running of all wheels before tightening down only the 2 rear screws.

 

post-246-0-99966200-1433997669_thumb.jpg

 

Install the Chronograph Wheel.

 

post-246-0-55950800-1433997672_thumb.jpg

 

Next fit the Chronograph Bridge and align the 2 pivot points to their jewels.

This has to be done without the ability to manipulate the wheels directly, so make sure you inspect the jewels with high magnification to be sure the pivots are in their holes.

And again, check the free running of the train.

 

post-246-0-03270800-1433997675_thumb.jpg

 

Replace the Connector

 

post-246-0-33547500-1433997677_thumb.jpg

 


Next we will install the small trains for the Counting Wheel, 1/10s and Hour Counters. 

These are the ones with the Red Coils driving them.

Remember that the wheels are specific for each train and should have always been separated ... DO NOT MIX THEM UP.

We shall begin with the right side.


 

Install the right side Stator and Rotor for the 1/10s Counter.

 

post-246-0-79666700-1433997679_thumb.jpg

 

Next replace the Driving Wheel for Counting 1/10s [8059/1]

 

post-246-0-70192300-1433997682_thumb.jpg

 

Then replace the Counting Wheel, 1/10s [8027/1]

Note this has 4 spokes to the wheel.

 

post-246-0-52406200-1433997686_thumb.jpg

 

Fit the Counting Wheel Bridge, making sure to align the pivots and test the free running before tightening.

 

post-246-0-10900500-1433997689_thumb.jpg

 

We repeat the process for the left side Hour/Minute Counting Train.

Install the right side Stator and Rotor for the Hour/Minute Counter.

 

post-246-0-41837300-1433997692_thumb.jpg

 

Replace the Hour/Minute Counter Driving Wheel [8630/1]

 

post-246-0-43733000-1433997806_thumb.jpg

 

Then replace the Hour/Minute Counting Wheel [8600/1]

Note this has 3 spokes to the wheel.

 

post-246-0-15927300-1433997810_thumb.jpg

 

Fit the Hour/Minute Wheel Bridge, making sure to align the pivots and test the free running before tightening.

 

post-246-0-26151100-1433997813_thumb.jpg

 

Fit the Red Coil to the right side Counting Wheel Assembly and screw down.

 

post-246-0-67566100-1433997815_thumb.jpg

 

Fit the Red Coil to the left side Counting Wheel Assembly and screw down.

 

post-246-0-96435900-1433997818_thumb.jpg

 

At this stage also screw down the 3 Green Coils.

 

post-246-0-17476500-1433997821_thumb.jpg

 

Refit the Additional Printed Circuit.

 

post-246-0-82019300-1433997823_thumb.jpg

 

Replace the Magnetic Screen.

 

post-246-0-68435600-1433997826_thumb.jpg

 

Secure the Battery Clamp.

 

post-246-0-19994900-1433997829_thumb.jpg

 

Then turn over the movement to the dial side.

 

post-246-0-75281300-1433997831_thumb.jpg

 

Fit the Date Indicator.

 

post-246-0-35097700-1433997939_thumb.jpg

 

And secure the Date Indicator with the 3 Indicator Maintaining Small Plates.

 

post-246-0-17748800-1433997943_thumb.jpg

 

Then fit the dial and hands and test all the functions of the movement.

 


 

The service is complete.

 

post-246-0-11005500-1433997946_thumb.jpg

 

As always, I hope this walkthrough was informative and instructive, and gives you the confidence to complete this service on your ETA 251.626

 

 

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Brilliant guide with great pictures and instructions. It might encourage me to have ago at solving a problem that seems to have defeated everyone I have asked so far. Perhaps some of you knowledgeable people can advise what is the problem cause.

My Tissot PR200 had it's  ETA 251.262 movement replaced and all seemed to work ok on initial checking but I did not have time to check all functions carefully.

It sat undisturbed for a couple of weeks and then I checked it more carefully.  I noticed then that the Minute register did not reset correctly after a timing event.

I readjusted it to the zero position as per setup instructions. After another timing  event and then zeroing the minute register it did not reset to Zero but to the 5 minute mark.  After further re-zeroing and timing events it did the same thing consistently. 

I checked it some days later and the problem was slightly different in that after re-zeroing and timing event resets the Minute register did not reset correctly and seemed to overshoot the zero reset point by a variable amount of between 3 and 12 seconds.

All the other functions seem ok.

Any ideas most welcome as I have no clue as to what produce these symptoms.  Many thanks

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Hi, I have this movement from a TH watch I was interested in, but the 1/10 and hour hands does not move, no matter the adjustments and chronograph functions.

Does anyone know if service parts are still available , and if this is a major failure of the movement and should be avoided? Thank you in advance. Rollee

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5 minutes ago, Rollee said:

Does anyone know if service parts are still available , and if this is a major failure of the movement and should be avoided? Thank you in advance. Rollee

Yes parts are available, but for a complete mov't cost of about USD 100 you will find that most watch repairers will not want to spend time in attempting repair.

BTW, please do no not hook into existing project topics just because you have a same watch. We have a dedicated section for repair questions. 

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14 hours ago, Rollee said:

Hi, I have this movement from a TH watch I was interested in, but the 1/10 and hour hands does not move, no matter the adjustments and chronograph functions.

Does anyone know if service parts are still available , and if this is a major failure of the movement and should be avoided? Thank you in advance. Rollee

Dear Rollee,

I am the creator of this thread, and you are more than welcome to post comments and ask questions regarding this movement any time you want my friend.

Yes sir, you can purchase parts from places like CousinsUK, and it's a fun and challenging movement to work on.  The best part is that no matter what, you can always get a replacement movement if all else fails :)

My hope is that this walkthrough helps you, and gives you the confidence to try and fix it yourself.

In Christ Jesus my Lord
Lawson

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    • Hello Trev. You came to the right place. Beginners to pros and everything in between. Welcome! Sent from my iPad using Tapatalk
    • Hello all,  I am new to this forum and still quite inexperienced when it comes to diagnosing faults. I was hoping someone could point me in the right direction for tracking down the cause of low amplitude. Some Background: I recently acquired a 12s ‘Delmark’ branded pocket watch was not running. It had a broken mainspring, and as I couldn’t find any model number or useful information on the watch I replaced the broken spring with the closest available silver alloy equivalent. After manually cleaning and reassembling the movement I found it to have very poor amplitude around 110 degrease. I disassembled the movement and inspected the balance, staffs, jewels and train gears and didn’t find any obvious problem. With just the balance installed and given a slight perturbation it smoothly oscillates for several seconds without any sign of excess friction.  I have also installed each of the train wheels individually and looked at the end play with my 10x loupe but wasn’t really able to distinguish excessive play (although I have no real experience here). There also doesn’t seem to be excessive lockup in the escapement, and the banking pins are nonadjustable. Also, the balance cock rests directly between the banking pins when the mainspring is let down.   It seems like there must be a glaring problem I am missing. Does anyone have any thoughts? Best regards EF7DDFED-5E61-4C34-8949-8A0692E977A4.heic
    • Hello all, This was my father's Gotham watch that my mother gave to him in 1942. It's an automatic, and although he stopped wearing it in the early 60's (he passed in 2000), it still runs with decent amplitude. I'd like to disassemble, clean, lube, and adjust it, but I don't know how to remove the stem to get at the movement. In the "Gotham 3" photo you can see the movement coming slightly out of the case, but I have not figured out how to release the stem to remove the movement completely. Any ideas? Thanks Dan  
    • Wow, just wow. Sent from my iPhone using Tapatalk Pro
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