Typically, the left coin slot in a two slot coin door was either 1 coin 1 play (a US Dime) or 2nd chute adjustment (shares the same adjustment selected by 2nd chute). A 3 slot door might have been designed for nickels, dimes and Quarters (US market). The left slot would be for nickels usually requiring 2 for a credit which might be done by the use of a stepper unit (like a score reel without the plastic reel attached).

However, in the case of these 1 coin 1 play, it always meant that the game merely energized the coin relay thereby instantly starting a game. There was no available adjustment to put only 1 credit on the replay reel.

So, there might be a jones plug down there that has a single pin and only two possible positions - 1 coin 1 play, or 2nd chute adjustment. And, you would install the quarter hardware on the left side of the door and block the other slots. This is how Tim does most of the games at the PHOF in Vegas. If he still does it, he then used the right hand slot for the Susan B Anthony dollar coin for a bonus value (like 5 plays for $1).

When you insert a coin in Chute one, the SRC Motor runs?
Check the wiring from Chute one, make sure it is not piggy backed to the other chute.

move the pin on the 2nd coin chute adjustment to the 1 position. that should change from 2 replays per coin to starting or resetting the game only, or adding 1 credit only.

ok try this. unsolder and disconnect the w-r (white-red) from the 3rd coin chute relay coil, using a alligator jumper , connect jumper from the white-red wire to the coin relay coil grey wire. this should make the right coin slot reset machine. block off the left coin slot.

I just pulled out the supplemental coin chute drawing from a Space Time packet.

Coin door types 1, 2 and 3 (all are 3 chute doors) all have the first coin chute hard wired to the COIN relay (instant start). The coin switch wire, beside the common yellow is White/Blue.

Type #4 is a 3 chute door with an adjustment for 1st coin chute for 2 coins 1 play or 1 coin 1 play (Nickel/Dime/Quarter).

The final door Type #5 is a 2 coin chute door WITHOUT any adjustment for the 1st coin chute. Unlike the other doors, the Left coin chute is wired using all three lugs of the coin switch (like the far right chute in every door) and can only be 1 coin 2 plays. While they refer to only LEFT and RIGHT coin chutes, the schematic ONLY has a 3rd coin chute adjustment (2 through 6 plays). In this case, the left coin switch has wire colors: Yellow( Common), Red/White (Normally Closed) and White/Red (normally open). Right chute is wired: Red/White (Common), White (Normally closed), White/Red (Normally Open).

When my camera battery is charged, I will snap a photo of it.

Here is the photo.
BallyCoin.JPG

silver_spinner do you still have this game? Can you send me a photo of the inside of the coin door?