FWIW Clay's EM guide is very useful.

It sounds like a similar problem that I had in my Wizard! It basically wouldn't start. After tracing reels to relays, Multimetering for power, I relized that I wasn't getting power for one of the main relays (reset?) I traced that wire back to the coin doir, and when I touched the wire at the coin mech, it fell off
I touched it together, and press start - BAM - everything is working again. There was multiple wires on that mech, so it must have killed the daisy chain.

I then remembered reading that Clay was against these coin mech's and was suggesting a mod to override them, especially in home use environment. I didn't go back and find the spot, it was easier to solder it back at this point.

Disclosure: I'm no EM tech, just sharing my experience.

What do you mean"rotates 170 degrees", why?
So the screen motor is not getting back to zero position?.
When the screen motor gets a start signal, it keeps going by it own hold sw located on

the cam next to the motor. If

Bloody auto correct. Using my phone tonight

Hi Danny, home from work, its 1am sunday.
Remember that we spend a lot of time fixing symptoms and not the problem.
With this in mind, we should make the known problem right first, the Score Motor.
looking at the schematic, I have had a thought. The SCR Motor is started by a number of other RE's. once started the SCR Motor hold SW (1E) keeps it running till it is back at zero poison. while making the rotation, it trips the all RE's that started the SCR Motor. in your case, at 170 degrees, one of the the RE's associated with cam 10, gets tripped and the SCR Motor stops, because the hold SW (1E) is not holding. And SW 1E is a make/break SW, while it is "made" it holds the SCR motor on, and the "Broken" side stops the credit button from working. I would look at SW 1E.

While the SCR Motor is not at zero poistion,the credit button will not work.

Help.jpg

In case you are wandering why i thinking it is a SW on cam 10 that kept the SCR Motor running till 170 Degrees. On the schematic it has the cams drawn. In your case there are 8 (zero to 7) position in 180 degrees, from zero to zero on the SCR Motor. this makes each position 22.5 degrees apart. Your SCR Motor is stopping short of Zero (170 degrees)- (180/8)*7= 157 degrees, Close.

Lesson 3 - reading schematics > Done

PS- The black spot is NOT on to off, but a change of state. Notice how cam 11 has its spots in between the positions, that's covered in lesson 11

Help.jpg

Just went back to you other post, you are already on to this.

http://pinside.com/pinball/forum/topic/kicking-myself-cleaning-switches-has-led-to-no-start

I had a problem once where the score motor was sticking when starting a game, all I had to do was give it a little nudge and off she went. I think that fix is in clay's guide also. Actually Norm & Shaggy's Tops video, the EM one has helped me out a lot!! They're hilarious too!! Proceeds go to Tim & Salvation Army.