"I assume that's on a chunk of cams on the score motor." ... assumed wrong!

the switch is on the animation motor cams.

since the thing is buzzing, the coil power is stuck on.

score motor not running is a problem, especially if it's stopped out of an "index" position as switches may be held closed that should just briefly pulse closed.

the score motor "carry-over" or "run" switch is cam 1, switch A ... see red circle in pic below ... maybe.

I probably shoulda asked if the score motor ever runs at least 120 degrees.

if you can shove the cams counter-clockwise with your finger, the motor turns on and the cams spin at least 120 degrees, ignore all the following.

I'm making the following assumptions:

- cam 1 is the metal cam, cam 2 is the plastic cam.
- switch A is the stack of switches I put the circle on. Is there a diagram of the score motor in the game or do you have a manual? Based on the labels ont he unit, the A label is highly likely to belong to the stack with the red circled switch.
- the circled switch looks like it has a green wire and probably grey wire, which is what the schem says. However, so does the bottom switch on the horizontal stack, so this could all be wrong.

if the circled switch is stack A, you can just push that switch with your finger since it's not 120V, but you can also push it with something non-conductive like a wood meat skewer if you aren't comfortable touching live circuits.

you can also just clean the switch and with the power off, turn the score motor cams and make sure the switch closes with good overtravel.

see http://www.pinrepair.com/em/index2.htm#clean ... lots of good info on that site/page about EM machines that apply to your game also.

tmi below
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notice the metal cam has notches ... the idea is something kicks the motor on, and once the A stack has climbed out of a notch, the carry-over/run switch will keep the motor powered until the A stack falls back in a notch. The notches are index position(s).

the motor should never stop out of an index position.

bullseye cam 1 switch A (resized).jpg

Is the switch circled in purple below closed?

if yes, wire colors green and (whatever the color is on the schem for the 0-9 unit step-up coil ... looks like maroon-orange) on the blades?

if yes, if you turn the cams with your hand with power off, does the switch being closed make sense? i.e. when the stack goes up the cam lobe, the switch is extra-closed.
bullseye cam 1 switch B (resized).jpg

can't really tell from the angle what cams the switches are on ...

sigh ... ok, I blew it.

the switch powering the 0-9 unit is in a square box, which means it is on the animation motor unit.

either the switch is stuck closed or the animation motor cams are stopped not at an index position.

look for the switches with the green wires on a blades and match them to the locations circled on the schem below. Can't tell from your pics how the switch stacks are labeled. Cam 1 is usually the one closest to the motor, but no gaurantees.

check_sws (resized).jpg

second pic is arcing in what I would guess is the score motor carry-over switch. If that is right, the score motor should not turn off if that switch stack is out of a cam notch. Clean/check the arcing switch. Some arcing is normal when the switch opens, but the switch contacts shouldn't be burned away too much.

a-1 arcing (resized).jpg

deal with unpowering the 0-9 unit step-up coil first, then if the reels aren't resetting make sure the score motor is turning. Reel reset pulses come from score reset relay switches, and the score reset relay is toggled on/off by a score motor switch when the start relay is powered.

the score motor cam switch stacks labels are at the screw/stack end of the switch blades, so the horizontal stack in the arcing pic above is stack A. Switch A should be the one closest to the stack mounting bar ... e.g. the arcing one.

the switch powering the 0-9 unit step up coil is on the animation motor cams (different than the score motor, animation cam unit shown in last picture in the post #1) - specifically "section B, cam 2, switch A" per the schem and the pic of the piece of paper posted.

either the switch is stuck closed or the cams aren't indexed (stuck or motor not powered when it should be).

the sections are the groups of switches arranged around the cams. They should be labeled.

if you push the cams clockwise (looking at the cams), when section A cam 2 switch A closes the animation motor should turn on and run the cams until that switch stack falls into a notch again.

if you can't figure out which stack is section A, B, etc. post more pics from various angles that include the wires on the switches so people can see the colors.