Just found this thread. I have an Aztec. Maybe I can help you out.

I have included a picture here. I am going to start very basic just to cover the obvious. If you can take a picture of your 100's reel and post it here that may help tremendously.

Unless you have a specific reason to suspect someone has tampered with the wiring I would rule that out at this point. These EM machines have hundreds of switches and they all must work together to operate properly.

With the fact the reel is "bouncing all over the place" during reset makes me think you may have a broken/weak spring.

1. Check that the reel does not move freely by hand. It should lock on a number and not be able to move freely. (if one of the levers is not latching properly the number reel will move to some extent)
2. Check the springs and that they are there and attached. the Green spring (I colored it green for identification) is the one I am mostly concerned about.
3. The Blue spring pulls the solenoid plunger back into the home position (out of the coil).
4. if the red latch is not latching on the reel you will get the symptoms you are describing.

Hope this helps.

And a picture paints a thousand words. include one if you can
Latchwcolors (resized).jpg

Lots of good info here. Hopefully should be able to clear up your issues.

Is the game new to you? Did these problems just start happening?

This issue is a bit more involved. This may have to do with switch alignment as mentioned. The 1000's point and 100's point relays are wired to common Make-or-Break (M/B) switches. One M/B switch is on the "A Relay" that is pulsed by the spinner. The other M/B switches (2 of them) are pulsed by the Center, Right and Left Jet Bumpers. If these switch blades are not properly aligned then you could get both 1000's and 100's reel to pulse at the same time.

Since you referred to the spinner causing the problem that is the M/B switch I am going to focus on. See picture below. Make sure your switches look like the area I have highlighted.

If both leaf switch contacts are touching that is your problem If the switch looks normal, like the example below, we need to do some more investigation.
A_MB_SW (resized).jpg

Possible issues is the mechanism is gummed up. The springs appear to be good.

If you move the plastic arm on the top of your first picture does it move freely?

Check the switch positions against your other 100's score reel mechanisms for players 2-4.

There are 3 different switch configurations, 0, 1-8, & 9 position.

Position 0 (or Zero Switch) - opens all circuits and prevents the coil from actuating via the score motor and No. 1 reset relay

Position 1-8 - 2 switches are closed and 1 is open

Position 9 - All switches are closed

Here are pics of correct positions.

This is the "0" position
0 (resized).JPG

This is the "1-8" Position
1-8 (resized).JPG

This is the "9" position
9 (resized).JPG

Moving the plastic score reel itself is a little involved. It is a little tricky taking it off without having to remove several parts. Remove the C-clip then the plastic arms need to be moved out of the way and the reel slid off the post.

That is quite a bit of work. Making sure the wires are marked and re-soldered good. Not easy soldering in place. If you could do it on a bench that would be better. You could end up with a bigger mess on your hands. I would not suggest that route. Visually looking at the parts will tell a lot.

Some basic mechanical checks can be performed and eliminate a lot of teardown and time.

Any Luck on your Aztec issues?

I have been cleaning up my Aztec Score Reels. Lots of cleaning and parts tumbling.

Here is my current situation.
IMG_1111 (resized).JPG