if I understand the issue correctly, you haven't gotten to where Z1 and Z2 matters yet. Even if your wipers are mispositioned, the player unit should be stepping if AX is tripped, P5B or S switch is closed, the score motor is running and score motor 1A switch is generating pulses.
dmarston is saying the issue is an AX relay switch (because you stepped the player unit manually to position 20 and Z1 did nothing).
To test, you have two options:
1] jumper from the power rail (red highlight on schem below) to the YEL-BLK wire on the most convenient place to get to it (yellow highlight on schem below).
2] use a voltmeter with one probe on the black power rail (most coils have one lug attached to this - purple highlight), other probe on YEL-BLK and see if you have around 25VAC. If not, the AX relay switch isn't working.
3] just check/clean the AX switch with the YEL-BLK and RED-WH wires on it.
tmi:
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the schem chunk below is much bigger than needed. For a coil to fire, you need a path from the power rail on the right (red highight) to the right side of the coil symbol.
if using a jumper, you can attach one end to the power rail anywhere it's convenient to access ... it's all the same wire daisy chaining around.
attaching one end of the jumper to the power rail is not the only way to use a jumper, but when doing it that way you are proving you have a good path from where you put the other end of the jumper all the way to the coil IF the coil powers.
ta_issue (resized).png