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Discussion Starter #1
Bought this nice looking, almost mint, BM-500W from eBay.
The ad said that it was not working, but one of the pictures showed the opened case without batteries, on that same pic I saw that all the springs were still present.
So I thought that mounting a set of new batteries and an AC resetwould bring the watch back to life, but unfortunately it didn't...
There are no visible signs of batteryleaks.

Here the pics from the eBay ad
s-l1600.jpg

s-l1600 (1).jpg

s-l1600 (2).jpg

s-l1600 (3).jpg

s-l1600 (4).jpg

s-l1600 (5).jpg

I would really like to restore this watch as it is in superb cosmetic condition. I already have bought a brand new, watch specific, original Casio replacement strap.

Why won't it wake up? :(
 

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Discussion Starter #2
Took apart the module this evening.
By doing that it became clear that the watch had suffered from leaking batteries. Also the flat cable that connects the sensor to the motherboard broke off.

Might sell it again for parts. Ideal for someone who has a good working module, but a worn case.
 

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That stinks, just had the same issue with a, G-350. Now I need a module for a mint band and bezel.

Never hurts to try.

Sent from Capt Kirk's Communicator
 

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What a shame. That thing is a beauty.
 

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Bought this nice looking, almost mint, BM-500W from eBay.
The ad said that it was not working, but one of the pictures showed the opened case without batteries, on that same pic I saw that all the springs were still present.
So I thought that mounting a set of new batteries and an AC resetwould bring the watch back to life, but unfortunately it didn't...
There are no visible signs of batteryleaks.

Here the pics from the eBay ad
View attachment 13567785

View attachment 13567787

View attachment 13567789

View attachment 13567791

View attachment 13567793

View attachment 13567795

I would really like to restore this watch as it is in superb cosmetic condition. I already have bought a brand new, watch specific, original Casio replacement strap.

Why won't it wake up? :(
Kosio, I may sound crazy in this but the upper conductor appears rusted? Have you noticed it? 20181018_173807.jpeg

Sent from my SM-G955U using Tapatalk
 

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Discussion Starter #7
So ever since I started this thread, I saved a query in eBay so that I would be notified whenever another BM-500 would be presented.
Many passed but for incredibly steep prices.
Until the other day, the watch I was looking for and that I needed to finish above project showed up on eBay.
There were some bidders, but the bidding didn't go that great, so I ended up with a working BM-500 for only 22,5 euro!
The band is very rigid and there are quite some scratches on the crystal and the display has faded, but all that does not matter, the module works!
So I will take the case and the lcd from the first watch and put in the module and sensor from the second watch and to finish it off I will put on that brand new BM-500 strap that I bought a while ago.

Here are some of the sellers pics:
s-l1600.jpg
s-l1600 (1).jpg
 

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Great news, as mentioned with my G-350, I found a mint condition one at a great price... And had to pounce.

So good tidings all around!


Sent from Capt Kirk's Communicator
 

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Discussion Starter #9
So yesterday history was made by the merge of the 2 BM-500's.

Behold, the ingredients:
IMG_20190712_095309 (Middel).jpg
A new strap, the good looking one and the working one. Together they will form the ultimate BM-500 ;-) b-)

I started with dismantling the working watch:
IMG_20190712_100541 (Middel).jpg
The parts I will be using from this picture: module (white thing on the left that says 'Do not turn') and sensor (the little thing on the right with the orange flatcable connected to it).

As the red part of the LCD of the working one had faded over the years, I decided to take the module apart as well:
IMG_20190712_101320 (Middel).jpg
Top left: battery holder, the green thing: main PCB, next to it: the LCD, bottom: display holder

What I noticed during the dismantling of the working one:
- it has had a rough life (seen the dirt, rust and scratches)
- both sensor springs are missing
- back cover seel has dried out
- sensor O-ring has dried out as well and very stiff

Some pictures to illustrate above:
IMG_20190712_100606 (Middel).jpg

IMG_20190712_114028 (Middel).jpg


Then I basically did the same thing for the looker.
The parts I was going to use from that one:
- housing
- back cover seel
- sensor O-ring
- sensor springs
- LCD

As soon as I put the module back together with the 'new' LCD, I tested it by putting batteries back in. My disappointment was huge when the module didn't come to life!! I tried an AC, friggled a bit with it, but no luck... must have been damaged as well during the battery leakage... So took the LCD out again and put the 'old' one back in. Testing... and it worked... Bit of a bummer, but hey, the case was still very nice!

I then continued by putting the watch back together. Mounted the module in the housing, connected the old sensor (after having it cleaned) to the main PCB, greased the seel and O-ring before placing those back, made sure that all the springs were in their proper place, closed the lid and put on the new strap.

All by all very happy with the result:
IMG_20190712_113418 (Middel).jpg

IMG_20190712_114239 (Middel).jpg


BUT... then I realised that during the mounting of the LCD, the black connectors between LCD and PCB had fallen out and that I had put them back in.... So I could not help thinking that something must have gone wrong there... so I decided in the middle of the night to take the watch apart once more to test the new LCD again.

Guess what... IT WORKS!!!

IMG_20190713_094836 (Middel).jpg

IMG_20190713_094916 (Middel).jpg

IMG_20190713_094931 (Middel).jpg

IMG_20190713_095752 (Middel).jpg


The fairest of them all... :)
 

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Great job, well done on the restoration and well worth the broken sleep :-!
 

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Hi, jealous of the photos ;-) I had two little springs appear when I was trying to replace the batteries on my BM-500W. They look kind of the same as the vertical spring that is still intact in the hole near "Japan." Anybody know where they go? Thank you in advance for your help.
 

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Discussion Starter #15
Hi, jealous of the photos ;-) I had two little springs appear when I was trying to replace the batteries on my BM-500W. They look kind of the same as the vertical spring that is still intact in the hole near "Japan." Anybody know where they go? Thank you in advance for your help.
Those are probably the springs that ground the sensor to your wrist. So they go in the 2 holes in the sensor area, on top of the screws that hold the sensor cover plate.
 

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Only just seen this, wow what an awesome casio. Great work, love the pics and write up. Congrats!!!! :)
 

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I’m currently doing the same thing as Kosio, I have the bm-500w thats in perfect cosmetic condition but so far I haven’t been able to find a donor watch with workin module. :-(

As with a lot of bm-500w’s the module in my good looking one was destroyed by battery leakage, so much so that one of the actual pads that the quartz crystal attaches to was completely eaten away, so it wasn’t even connected anymore.

Hopefully I’ll find a donor soon.
 

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Discussion Starter #20
I’m currently doing the same thing as Kosio, I have the bm-500w thats in perfect cosmetic condition but so far I haven’t been able to find a donor watch with workin module. :-(

As with a lot of bm-500w’s the module in my good looking one was destroyed by battery leakage, so much so that one of the actual pads that the quartz crystal attaches to was completely eaten away, so it wasn’t even connected anymore.

Hopefully I’ll find a donor soon.
Came across this one : https://www.ebay-kleinanzeigen.de/s-anzeige/casio-digital-uhr-bm-500w/1288078795-156-7879

A possible donor candidate?
 
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