First of all let me say that this is very simple to do, takes about 20 minutes to do. I don’t know how other meters might be, as I’ve only ever seen this one, a Gottlieb year 1972. Maybe someone can let us know…
In any case, I’m sure they are all based on the same principal; basic odometer mechanics.
By the way, they are not made by Gottlieb but bought from ENM Company- see at enmco.com.
The basic principal fig:0 : The first “digit” has a sprocket in the center of the reel. Each time the coil is activated the arm comes down, which pushes down the big white plastic part, and that makes the first digit turn one tenth of a turn = one number.
From the second digit , to the sixth they are constantly connected to a black sprocket below, and If you look at the first digit, between the 4 and 5 you can see a little “indent” .
When the first reel turns, that “indent” comes in contact the black sprocket between the first and second digits, it turns the black sprocket 1 tenth, which in turn, turns the second digit 1 number.
That’s how you go from 000009 to 000010, and so on…
Taking apart is always easy. In the photo, fig, I show only one screwdriver, but that did not work. I had to use 2 in order to remove the circlip.
I used a paper clamp throughout cause I wasn’t sure what was going to happen. Luckily for me it was the perfect size, but you really only need it for reassembly. At one stage all the reels were separated. Unfortunately, I forgot to take a photo of all the reels to show you the difference, sorry !
Once you’ve removed the circlip, you can take out the axel, fig:2 and remove the wheels to see where the problem is.
fig:3 This is what the plastic part that goes up and down when the coil is activated looks like on the inside ,
In my case the problem was a piece broken on the big plastic fig:4.
I fixed it using a ball of foil paper! fig:5. I don’t know for how long, but it work fine.
Place all the reels on the axel to align them, and add the clamp fig:6. (If you look on the left side in the red circle, which is the first reel, you can see the sprocket).
You can now remove the axel fig:7.
fig:8 : These are the parts to reassemble.
Now take the clamp with the reels, add the spring and the washer, place them back in the unit, making sure the little black spockets are in the right positions, and add the axel. All that is left is to add the circlip.
Just put the cover back on and place back in the machine.