Attempt at restoring 7548-700a - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 04-24-2017, 02:03 PM   #1 (permalink)
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Default Attempt at restoring 7548-700a

I originally mentioned this in my original post but thought id create a new one for this attempt at bringing a poorly 7548-700a back to life.

It arrived in rather poor state, movement completely dead and battery leakage evident on both dial and chapter ring sadly. Thought id see whether i could resurrect this somewhat lost cause. First pic you can see some of the corrosion that has permeated the whole movement and through to the dial and chapter ring unfortunately:



In dismantling i discovered that the date wheel was frozen in place due to the corrosion, i managed to free this off but the teeth were shot - i think someone had tried to forcibly turn the crown and it just stripped quite a few teeth off:

Deposits on the movement:


After cleaning up the movement as best i could (blue crystal deposits and white gunk) and re-assembling it was still a no go - coil or circuit likely at fault im guessing. I managed to source a working 7546 movement and a 4pm date wheel from a kind member (thanks again to melt ) and set about transferring the required parts. Date wheel fitted ok - so far so good. Then i swapped out both circuit and coil - and we have signs of life! brilliant, so i put it all back together again.

At this point i thought i was home and dry. But alas she wasn't keeping very good time, obviously my clean up job wasn't sufficient (i didn't strip it completely as this is currently beyond my skills). So, back to the 7546 - i decided to swap everything back to this and go with that until such time as i can further strip and clean the 7548 and get that back up and running.

As can be seen, far from perfect, but a massive improvement on the wreck that came to me, dont seem to be many of these around so i thought it was worth saving. I put a new crystal in but some new hands would be good (ill see about some aftermarket ones whilst i look at refinishing and luming these perhaps).

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Old 04-24-2017, 02:23 PM   #2 (permalink)
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Did you not take the bridge off and clean the train wheels then? It's really not that difficult. Just take plenty of pictures in stages so you can refer back to them on rebuild.

Quite an interesting looking movement that. I've rebuilt loads of plastic Seiko Quartz movements so if they're doable, this should be.

Let us know how it goes, good luck.
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Old 04-24-2017, 03:01 PM   #3 (permalink)
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Hi, i did actually remove the bridge, but chickened out of removing the various train wheels, tried to gently clean in-situ (probably frowned upon). I now believe i can do it, although the train bridge was a nightmare to get back on correctly, although again i think i figured out how i might do it faster next time.
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Old 04-24-2017, 03:56 PM   #4 (permalink)
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Yeah, go for it then. The tricky bit will be getting the bridge back and you managed that so no big deal.

Have you got any magnification? Even if you just get a cheap magnifying visor glasses it will help no end.
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Old 04-24-2017, 04:29 PM   #5 (permalink)
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Great stuff Tim and keep at it. Definitely try and clean the hands, I have a method that should work well and I'll be back to post some decent info soon instead of rants, just bit busy at the moment.

Anyway well done so far.
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Old 04-25-2017, 04:27 AM   #6 (permalink)
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Thanks Guy, look forward to hearing about your method. I had wondered about removing the lume (do i need to be careful doing this - did lume contain radioactive elements?)

Does anyone know what colour the bezel and hands should be on the 700a. Seems to be conflicting info available.

TigerUK's table appears to indicate silver for both with silver lume border on the dial. This appears to make it identical to the 700H. (would appear to tally with my own 700a.) But i have seen other info/pics showing the 700a with gold hands/bezel insert
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Old 04-25-2017, 05:01 AM   #7 (permalink)
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[QUOTE=uncleluck;2178601

Have you got any magnification? Even if you just get a cheap magnifying visor glasses it will help no end.[/QUOTE]

Just an eye glass. I'll invest in a visor of some sort.
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Old 05-02-2017, 07:20 AM   #8 (permalink)
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So, i stripped down the 7548 again and cleaned the train wheels. However, i wasn't happy with condition of a couple of them so replaced
with some from the 7546.

During re-assembly i discovered the day wheel wasn't advancing correctly - tracked it down to a bent tooth on the plastic wheel (i should have realised this as the original day wheel was totalled so logically the plastic wheel would have suffered damage). So i dismantled it again and swapped over the plastic wheel from the 7546. (ive now lost track of how many times ive had this apart!)

The good news, its all working OK and keeping good time by looks of things. I think due to all the time ive spent on it im now quite fond of this one, despite its obvious cosmetic flaws (may go hunting for a replacement chapter ring/dial at some point).

Edit - one reflection i should have called this fixing rather than restoring possibly. Oh well. Hopefully the good folk round these parts will cut me some slack

Last edited by Qubit; 05-02-2017 at 07:53 AM.
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Old 05-02-2017, 08:18 AM   #9 (permalink)
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Fixing or restoring is all semantics. What's important is you enjoyed yourself, gained personal satisfaction and learnt along the way. Well done.


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Old 05-02-2017, 08:50 AM   #10 (permalink)
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Yeh agree with Tristan. Sounds like you've done a good job. It's nice to have a watch on the wrist that has had your own work done to it.
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Old 05-05-2017, 08:18 AM   #11 (permalink)
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Thanks for the feedback folks. I might have tracked down a NOS dial and chapter ring so it may yet have a cosmetic overhaul as well......

Its gained a second in 4 days which im happy with. Dont fancy messing with the trimmer.
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Old 06-08-2017, 04:54 AM   #12 (permalink)
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Quick update, found a new dial and chapter ring. Fitted some better hands and bezel insert too. Happy with the outcome and Ive moved it on to my UncleSeiko beads of rice to finish it off.

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Old 06-08-2017, 06:11 AM   #13 (permalink)
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I think you have ended up with a presentable and worthy watch. One thing I have learned from projects such as yours is when you acquire a grotty non runner it pays to bite the bullet ant strip it down to individual components and thoroughly inspect every element for dirt, wear and damage before cleaning, replacing any dodgy parts and reassembling. This will save multiple rebuilds and back tracking. Then you know it is in tip top condition for the foreseeable future.

I found the 754x's are a joy to work on compared to many of its contemporaries and are an excellent introduction to quartz tinkering. Even so decent magnification is necessary to get all the gear train staffs lined up in the gear train bridge but it is good practice. I always find the stepper armature the worst bit and use a loupe and fine needle to do the prodding.....er, aligning.
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Old 06-08-2017, 07:12 AM   #14 (permalink)
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Well that turned out pretty nicely in the end Tim. Good job finding the dial I bet that cost a fair amount but worth it. Excellent!
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Old 06-08-2017, 07:22 AM   #15 (permalink)
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Quote:
Originally Posted by pollyc View Post
I think you have ended up with a presentable and worthy watch. One thing I have learned from projects such as yours is when you acquire a grotty non runner it pays to bite the bullet ant strip it down to individual components and thoroughly inspect every element for dirt, wear and damage before cleaning, replacing any dodgy parts and reassembling. This will save multiple rebuilds and back tracking. Then you know it is in tip top condition for the foreseeable future.

I found the 754x's are a joy to work on compared to many of its contemporaries and are an excellent introduction to quartz tinkering. Even so decent magnification is necessary to get all the gear train staffs lined up in the gear train bridge but it is good practice. I always find the stepper armature the worst bit and use a loupe and fine needle to do the prodding.....er, aligning.
Hi Polly,

thanks for the kind words. Ive definitely learnt a lot, but am well aware there's far far more i dont know. Certainly next time i get a non-runner i would strip it down straight away. Although certainly not easy i have enjoyed working on this and it seems easier than I imagine something like a 6309 would be (although i understand the calendar side is basically the same - oh yes i also replaced the date wheel with a much better one so now its pretty much spot on).

As for the stepper motor, that's certainly the one that gives me the most trouble so far! One time it went in really quickly - but normally i end up giving myself a crick in the neck nudging back and forth for ages!

Just waiting for a spencer klein crystal for the other 7548 now...... (and maybe a pepsi version to go with them - i can see how this could get expensive......)
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Old 06-08-2017, 07:33 AM   #16 (permalink)
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Quote:
Originally Posted by GuyJ View Post
Well that turned out pretty nicely in the end Tim. Good job finding the dial I bet that cost a fair amount but worth it. Excellent!
Thanks Guy - yep the dial and chapter ring came as a NOS pair which I was very lucky to find (sadly not cheap you're right, not too far off what i picked up the watch for! But worth it especially as it is the correct one for the watch.)

Think the next watch i do will be a more sympathetic job. I like this watch but also do like those that have earnt their scuffs and grazes.
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Old 06-08-2017, 08:48 AM   #17 (permalink)
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I think it looks great. Takes on a whole new appeal when it's been salvaged and restored.
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