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Thread: First successful open heart surgery

  1. #1
    Moderator G-Shock/Digital Sedi's Avatar
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    First successful open heart surgery

    Yesterday I adjusted a Casio for the 1st time - never had the guts before and it also wasn't necessary as all of them run well within specs but I received a PRG-100 that was over one second slow a day. First I thought about selling it but I like the watch so much and it was on my wish-list forever so I gave it a go.
    When I opened it I didn't even know if it has a trimmer screw but lucky for me it has one. First you have to remove the strap however - the plastic back-protector is attached to the backplate (looks like it's simply snapped on).




    Strap removal is fairly easy as it has those metal pieces that hold the springbars - I used a paperclip to push in the springbars.
    You can also see that it's a "sample" watch with the engraved "S" on the backplate.


    The trimmer screw is to the bottom-left of the battery.



    I took my most precise Casio (AE-1000 which runs at about 1-2 sec + / month) and started adjusting - I gave the screw a little turn counterclockwise to speed it up - then used the stopwatch of the AE-1000 and started it once the PRG-100 reached the full minute so that they were perfectly in sync - then watched it for an hour or two - the whole process took about a half day with repeated turning of the trimmer screw and then checking against the stopwatch. Once it seemed to be in sync with the AE-1000 for a longer time I closed it back up and synced it with my GW-6900. After one day it still shows almost no deviation from atomic time - operation successful and I can finally enjoy this great watch!
    Some thoughts on the process:
    - I had to turn quite a bit before I noticed any change for the better - in the end it was almost 1/4 turn
    - I ordered some JIS-type screwdrivers as I slightly messed up the backplate screws - which is bound to happen with Philipps-type drivers as they're just the wrong type - sure won't happen next time with the new screwdrivers
    - It was all worth it as I hate a digital watch that runs slow and I didn't want the watch to be "spoiled" for me as I really like this model - a review of the PRG-100 will follow soon.

    cheers, Sedi
    Last edited by Sedi; Dec 5, 2014 at 12:16 AM.

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  3. #2
    Moderator G-Shock/Digital Sedi's Avatar
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    Finally the right tool for the job:




    So I opened it one more time as it was still running a little slow (yet much less so than before the operation) - the screwdrivers work great - no comparison to a Phillipps. I should have gotten some of those long ago.

    cheers, Sedi

  4. #3
    Member cpl's Avatar
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    Wow! Did not know you can adjust a digital watch.

  5. #4
    Moderator G-Shock/Digital Sedi's Avatar
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    Not all of them have a trimmer screw however but if they do it's pretty straightforward. From what I know the newer Casio models don't have one anymore.

    cheers, Sedi

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  7. #5
    Missing manual. BlackNomad's Avatar
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    Quote Originally Posted by Sedi View Post


    The trimmer screw is to the bottom-left of the battery.
    Thanks for the post, Sedi! I can't see "S" on the back plate, but I see "AC" at 10 o'clock - does it have an Air conditioner?

    "Happiness is not a state to arrive at, but a manner of travelling." Margaret Lee Runbeck.

  8. #6
    Moderator G-Shock/Digital Sedi's Avatar
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    Yes, if it gets too hot the fan turns on but one should be careful if said "s..." hits it.

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  10. #7
    Moderator G-Shock/Digital Sedi's Avatar
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    Seriously though - the "AC" is the contact for the reset procedure - after changing the battery you need to shorten the battery with the AC-contact - some say it stands for "all clear" but I'm not sure on that. The "S" for sample can be seen on the 1st 3 pics - it's on the backplate of the watch right across the Protrek logo.

    cheers, Sedi

  11. #8
    Happily unadjusted 😜 popoki nui's Avatar
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    Quote Originally Posted by Sedi View Post
    Seriously though - the "AC" is the contact for the reset procedure - after changing the battery you need to shorten the battery with the AC-contact - some say it stands for "all clear" but I'm not sure on that.
    I'm certain; it does indeed stand for "All Clear". And as you know, that is what happens when you touch the battery + to that connection: it basically reboots the watch, clearing all the previous settings.

    ~Sherry.
    Eterna | Tudor | Seiko | Casio | G-Shock | Orient | Swatch | Mondaine | Zodiac (pre-Fossil) | Rolex | Wenger | Hamilton Pulsar Time Computer | Omega | Timex | Bucherer | Citizen



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