this post is not really about troubleshooting - I stick to the problem "faults on Score-Drums may hinder the pin to make it through the Start-up procedure" --- some loud thinking of me - You may think of doing some of the described jumperings.
On top, left of the JPG I show (my words) "simple jumpering" and "de luxe jumpering". The simple jumpering is ONE Jumper-Wire making an wanted connection --- permanent connection. This works fine in many situations --- but maybe the problem is tricky and we want to be part of the logic - helping the pin - at a specific time we do for a short period of time "Connection" --- then we cut the connection. So the "de luxe jumpering": I take TWO long Jumper-Wires - I take the free end of both wires through the open Coin-Door out into the open --- at the time I want connection: I hold one wire on the insulation --- I hold the other wire at the insulation - and I tip together the two blank ends.
A "super de luxe jumpering" is: I mount an door-bell type push-button - and I comfortably just push my doorbell pushbutton.
Different Jumperings - the 1,2,3,4,5,6,7,8:
I may say "I am not interested in the Score-Drums to fully reset - I take what I get - BUT I want the Player-Unit to step to Home-Position, So I establish the permanent jumper "1".
I may say "I am not interested in the Score-Drums to fully reset - I take what I get - BUT I want the Player-Unit to step to Home-Position, So I establish the permanent jumper "2".
Whats the difference in "1" and "2" ? They are almost the same - the difference is: When doing "1" I also jumper the connecting "wire of color brown-white-red" --- doing "2" I use the original wire "wire of color brown-white-red" in the pin --- IF (if, if) I do once the "1" and then the "2" and I get different results: I am told: There is a problem in the pin in that "connecting wire of color brown-white-red".
I may say "I am not interested in the Score-Drums of Player-2 - I am only interested in the Score-Drums of Player-1 (and then later Player-3 and Player-4)" --- so I establish the "3" or the "4".
Whats the difference in "3" and "4" ? It is the same difference as in "1" and "2" - the connecting wire (here of color white-slate).
I may say "I am not interested in the Score-Drums of Player-2 - I am only interested in the Score-Drum of Player-1 (and then later Player-3 and Player-4) --- ONLY Score-Drum 'the 10000's Score-Drum of Player-1". So I establish jumpering "5".
I may say "I do all or some of the jumpering "6" and or "7" " --- I can get informations on the connecting wires in the pin I can get infrmaion of a specific switch I just have jumpered.
A question - when I do the jumpering "8" --- WHAT is the difference to "doing the '4' " ?
Well - maybe in the pin there is a fault in the connecting wire color-black-white-red - connecting to SWITCH on the Z1-Relay --- doing once the "4" and later the "8" and I get different results: This tells me about this connceting wire.
When the pin is early in the Start-up procedure - has not yet reached position-20 (on the Player-Unit): The not-yet pulling Z1- and Z2-Relays therefore have the switches closed --- along my "red wiring" the Score-Drums-Switches (ALL) are bypassed --- the Player-Unit steps and steps and steps caused by the pulsing Score-Motor-Switch-1A. THEN The Player-Unit reaches position-20 (marked brown) - Z1-Relay pulls-in and opens its switch - NOW the Score-Drums of Player-1 and Player-2 must step forward to Zero so ALL their switches close --- current can pass - Add-Player-Unit-Coil fires - the Unit steps a step forward to position-21 and the stuff with Player-3 and Player-4 Score-Drums is taking place. And after that is done: "Z1- and Z2-Switches" are both closed again --- happily / rapidly stepping to Player-Unit-HOME-Position.