Repair and Disassembly
From G-Shock Wiki
Removing the Bezel and Band
Use the proper tools:
- Phillips screwdriver - Most sets of small precision screwdrivers will include one that will work on Casio G-Shock screws. This one is from a $6 Husky screwdriver set available at Home Depot stores - Link
Here's a photo of a good one for G-Shock screws: 
- Spring bar removal tool - You can use a slotted flat-head screwdriver or a specialty tool found easily on eBay - eBay Search
Be very careful
- It's very easy to scratch the watch case, crack the resin parts, or bend a spring bar if you're not careful.
- You should consider practicing on cheap or beat up watches first before doing any work on an expensive model.
- Keep a firm grasp on the watch and any tools used during process.
Removing the band
- Use the spring bar removal tool to compress the spring bar toward the center of the band.
- Slowly swing the band outwards away from the watch case (careful that the spring bar or tool do;t make any scratches)
Removing the bezel
- Most G-Shocks have four small phillips screws that need to be removed before pulling off the bezel (hex screws on the top of Frogman models are purely cosmetic).
- Carefully unscrew the screws and set them aside (be careful that the soft metal is not damaged by the tool).
- Use your thumbs to pull the bezel up and over one pair of buttons.
- Once one side it clear the other side should easily slide off.
Re-Installing the band
Putting the spring bars back on can be tricky, especially if the springs are stiff. I will compress them a few times between my fingers to loosen them up if necessary. Then you basically put one end in the corresponding hole and hold the band against the module with one hand. And with the other hand compress the spring bar and slide it into the second hole. I use a small metal rod to guide the second end in. It takes some practice to get good at it.
It can be really easy to scratch the case with the spring bar or a tool if you're not very careful. I would practice on a beater watch first. Also, my technique varies by the model. Some are easier than others.
G-Shock watches are known for being tough, but many users might feel irritated that such a sturdy watch comes with such a weak band (not the metal version, but the PVC plastic one), that often cracks and breaks after several months of everyday wear. MaraTac makes a watchband called the Zulu, which made of is ballistic nylon and is suitable for secure extended wear under rough conditions (even diving). To install the MaraTac Zulu watchband, you must first obtain an adapter for the G-Shock, and the appropriate size band (22 to 24mm width only). The procedure for attaching the adapter is the same as for re-installing the regular PVC band. With the new watchband, you should get much more use out of your favorite G-Shock. See Bands and Strap Adapters for more information.
Re-Installing the bezel
Putting the bezel back on is easy enough if it's not in bad shape. I just put it over the two longest buttons first and slip it down over the other side's buttons carefully.
Removing the Buckle
Swapping the buckle is easy, as it's just a springbar holding the buckle on, and the 'lugs' of the buckle should be drilled thru, so you can just push a pin/tool in to compress the springbar and pop it out, thus removing the buckle. -Topher1556
Removing the Buttons
Swapping the buttons should be no problem, but be careful. There are very small circle clips (I call them 'Jesus' clips, because if you don't hold them tight when removing them, they fly off...and usually you'll say something like "Jesus...", as they are GONE ). The small clips snap onto the button shaft and hold the buttons in. To get to this point, you have to remove the module. -Topher1556
Removing the Module
Remove the module, use some good needle-nose pliers to remove the circle clips (maybe even locking needle-nose pliers to make sure you've securely got the clips), and the buttons should slide out of the case.
If you're working on an atomic/solar module, you need to be very careful with the antenna for the atomic receiver, as it's quite thin, and the cable is very short. Just don't be rough with it, and you should be alright. -Topher1556
Lubricate the gasket whenever opening the case back
- Run some silicon grease (aka dielectric grease - auto supply shop) along the rubber gasket before sealing the watch back up. This will prolong the life of the gasket and keep it nice and water-proof.
Removing Scratches from the band and bezel
Removing marks from a G-9000 Mudman bezel
Rubbing out marks on the softer resin band with a pair of old jeans works, but that doesn't do much for marks on the bezel.
The best method is to use 1500 grit emery cloth (sandpaper for metals) or higher. The higher the number the finer the emery cloth.
Take a small piece and very lightly scuff the gloss area (by hand, no dremel tools) on the impact site to tone down the gloss. Then rub your thumb over the area to slightly burnish the area. Finally use a soft Staedtler white eraser (drafting eraser - available everywhere), and gently tap the area for a final burnish.
The glossy impact areas will now be matte and not as noticeable as before. It won't return to a "like new" state, but it will be far less noticeable than the high gloss impact marks.
- by Ghobbit
Changing a G-Shock Battery
- Sjors' G-Shock Battery Change Tutorial - http://www.youtube.com/watch?v=ogCz2vjUKVg
DW-5600E Disassembly
Full Tutorials
- How to convert a plain DW-5600 LCD to a negative display - Full disassembly instructions included in this excellent photo filled tutorial.
Warnings of Caution
- What Not To Do!!! - Complete guide on what you should not do when taking apart a DW-5600E G-Shock.
Projects Which Require Disassembly
- Improve the Accuracy of your G-Shock - Open up and adjust the time-keeping ability of your G-Shock
DW-5600 Caseback Variations
- Casiophile's great article with lots of photos on all the different types of screwbacks found on vintage G-Shocks - http://www.gmtplusnine.com/2008/01/22/dw-5600-caseback-variations/
