Thursday, January 17, 2013

Casio PAG 40 battery replacement

Please note that this is not a step by step guide on how to replace the batteries but just to show how it can be done if you have the right tools, knowledge and experience. Always remember, when in doubt, it is best to send the watch to your local watch guy or Casio service center. 

I have removed the straps to make it easier to replace the batteries. 


There are 8 screws you need to remove. Remember where they all go...


The back 4 screws removed.


The side 2 screws removed...


The rubber case back removed. 


The stainless steel case back exposed. 


Stainless steel case back removed. Remember to lubricate the gasket before closing up the watch.


We are almost there. Need to remove the white plastic cover. 


Careful not to lose or dislodge these springs. They connect with the piezo-electric speakers on the case back.


The movement exposed...


The white plastic protection cover. 


Don't forget to reset the watch (as per the instruction) before you close up the watch.


Module made in Korea. 


The points to reset your module after the battery change. 


The batteries, 4 off...


Another view. 


The 2 at the sides are held by a hinged plate. The locking tab at the 3:30 o'clock position.


The center 2 batteries is held by a plate that is held in place by a locking tab at the 12 o'clock position and 2 'hinge' tabs at the opposite end. 


The other battery, also held by a hinged plate. Locking tab at the 8:30 o'clock position.


The locking plate of the central batteries. Locking tab at the 6 o'clock position. You can see the slot to insert a pin to unlock the tab in the center of the plastic (white) holding the locking tab in place.


You can just see how the tab is held in place. It is held in place by the resin/ plastic part. 


The same for the batteries at the side. 


To unlock the tab, just insert a pin in the groove and pry the tab. Not much force is needed. In fact, very little force is needed.


Another view.


Yet another view. 


Just 'pull' the pin towards you.


The tab unlocked. 


Another view of the locking tab. 


Now for the middle batteries. 


 Same tool, same way. And the tab unlocks. 


Another view of the locking tab for the central batteries. 


You can remove the locking plate to make it easy to replace the batteries. 


The locking plate removed. 


The locking plate. 


The locking plate back in. Just hook the two 'hinge' tabs and press down on the locking tab and it will lock itself. 



All the batteries in place and locked in place. 


Remember to reset (AC) the module before you close up. Also remember not to rotate or turn the watch over to check as it can cause the springs to fall out. Once everything check out OK, you can close up the watch. 

22 comments:

  1. Just bought one of these watches. Ordered replacement batteries and will change the batteries later this week. Can you please go a little more into detail on how to reset the module? Thanks

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    Replies
    1. Hi dacoroman,

      Welcome to the blog. The reset is as per the picture in the post. Just use your tweezer and touch the points shown and the module will reset.

      Best regards,

      Ivan

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    2. Excellent tutorial ... thank you Ivan.

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    1. Hi Xeric,

      Welcome to the blog. With regards to your question, perhaps you can try and remove and reinstall the batteries. Then reset the module. Follow the manual for the duration of the reset. All the best.

      Regards,

      Ivan

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  3. Hello thank you for you in depth and detailed tutorial. it has really helped me a lot. I've replaced the batteries and reset the module. The clock is fine but the other instruments show ERR when i try to use them. and the compass only points west no matter what. do you have any ideas on this? thank you.

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    Replies
    1. Hi Busterbeam,

      Welcome to the blog. With regards to your question, you can try and reset the module again. It might help. If not, try removing all the batteries and checking that they all have power and start the entire process again.

      All the best.

      Regards,

      Ivan

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  4. Did you notice that your watch is missing a spring next to were your watch band connects. I don't know what it's for but mine has it.

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    Replies
    1. Hi Danny,

      Welcome to the blog. I am not surprise if there is a spring missing in my watch. I am not the original owner of the watch and it was in bad shape when I got it. I suspect that spring could be the one that activates the auto back light (?). I am still looking for a newer version to mine.

      Anyway thanks for the info.

      Best regards,

      Ivan

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  5. where can I get the pathfinder watch pag-40 rubber case back? thank you

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  6. Hi all,
    I have a pag-40 but some days ago a replaced the four batteries, before close it I reset all the batteries and the clock, alarm, compass, wrok good except the barometer and the altimeter, when I press whichever of the bar or alt buttons in the screen appears error and in the numbers display appears OFF. Any idea or suggestion?

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  7. Hello. Can you tell what you use to lubricate the gasket? And what type of batteries going in and what make.

    Thanks

    Pawel

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  8. Battery is
    sony 395 / sr927sw 1.55v

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  9. How many of each batteries does it take

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  13. Hi. Very helpful, but reset is still not clear to me. what , precisely, do I need to touch?

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  14. Oddly I've done three battery replacements and never had to reset once

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