Hi Wickerman2 +
one thing is the mystery (Reset-Relay) - another thing is You want to PLAY. Here: http://www.pinrepair.com/em/index.htm I read a lot (excellent as http://www.pinwiki.com/wiki/index.php?title=EM_Repair ) -> http://www.pinrepair.com/em/index3.htm#free -> down to "Add-A-Ball and Novelty Game Free Play" - they suggest to mount a Door-Bell-type of switch or a simple Leaf-Switch so pushing the "Coin Return Button" does temporary close this switch.
The Reset-Relay has a Self-Hold-Switch - usually the bottom-most switch. A short wire runs from one side of the coil to that bottom-most switch. The wires soldered-on onto that switch are color-51*** and color-24***. The Return-side-Lug on the transformer has two wires "color-30***" soldered-on (I believe 30 equals YELLOW).
Want to try (?): Clip-on a Jumper-Wire at "Coil on Reset-Relay, side wire-color-51, side-with-the-short-wire-running-to-bottom-most-switch-on-the-relay" - take the Jumper-Wire NEAR Transformer-Lug-30 - press the Credit-Button -> Balls roll into trough -> NOW touch with the Jumper-Wire at Transformer-Lug-30 -> the Reset-Relay should pull-in and the Score-Reel reset will be done.
Instead of "Jumper-Wire": Mount a permanent wiring with an Switch in the wiring and mount the switch somewhere (nice: at the "Coin Return Button").
I am interested in the "mystery" - actually TWO mysteries: AAA: Is there a "Switch on Reset-Relay" to let the Score-Motor run (not drawn in the schema, but pins I know have that switch) --- BBB: How comes "Zero-Position-Switches on Score-Reels NOT beeing in Zero-Position (therefore CLOSED) do NOT keep the Reset-Relay pulling after You pressed "Credit-Button" --- BUT when You afterwards MANUALLY actuate the Reset-Relay - miraculously these Zero-Pos-Switches NOW DO KEEP the Reset-Relay pulling ...
Should the "Switch on Clock-Relay" be closed after pushing the Credit-Button ?
To AAA: A strange thing: An "Normally-Open-Switch on Game-Over-Relay" and an "Normally-Closed-Switch on Tilt-Relay" do let the Score-Motor run - very strange. I had a look at schema-6VAC-Side (the lights) - again, very strange: Switches on these relays let the "Game-Over-Light" and the "Tilt-Light" shine (?)
Wickerman2, want to investigate on these two relays - and report (?)
I would like to know WHAT relays sit in the "Relay-Bank".
How many positions has the "Clock-Unit" ? I see drawn 12 positions - but I read in the schema: "Clock-Unit: 23 Roll-Over-Position", "Clock-Unit: 48th position actuates the Set-Up-Relay" (?)
Does the pin "kind of reset" the Clock-Unit at start-up - is it an "endlessly stepping forward unit" or has it two coils (one for reset) ?
When does the Set-Up-Relay actuate ?
HOW MANY SWITCHES ARE MOUNTED ON THE RESET-RELAY ? -> I then could look all over the schema to find the switches to learn about these switches ...
Has the Reset-Relay a Normally-Open-Switch with Wire-color-30, with wire-color-74 soldered-on ? (((to let the Score-Motor run)))
color-51*** and color-24*** etc.: want to show some more snippets of the schema ? - so I could complete the "putting together the snippets" ? Greetings Rolf