Possibly. The schematic will tell the exact switches on the Player unit.
I'll need to see a high quality scan of the schematic from e.g. Staples ($2) or Kinkos ($6)

Check out Clay's advice: http://www.pinrepair.com/em/index2.htm#reels

Hi mrbanjo
in post-1 You write "2nd-player-10s-Score-Drum does 90% not step forward to its Zero-Position when starting a new game". See the JPG - on the lower part is what HowardR is mentioning --- a problem in the switch "P4A" --- and/or the wiring.

The upper part of the JPG shows "green" the stepping through the players / balls when playing.
"Brown" is the last ball stuff. "Blue" is when starting a new game - resetting the Score-Drums - the Player-Unit is involved. First the Player-Unit is stepped some steps (depending on the previous game) - stepped to "NOW is the time to reset (means stepping forward) Player-ONEs Score-Drums" --- then a step on the Player-Unit - to "NOW is the time to reset (means stepping forward) Player-TWOs Score-Drums" - then one or more steps (Player-Unit) to reach "Player-Unit-HOME-Position - so Player-1 then can play Ball-1. See (blue): Each Score-Drum has TWO switches on position-Zero --- one switch opens when reaching Zero-Position - the other switch closes when reaching Zero-Position. IF (if, if) "encircled blue - faulty always closed" fault - two situations are possible (I talk only on 10s and 100s Score-Drums of Player-2): The 100s happens to be on 100, 200, 300 and the 10s happens to be on 60, 70, 80 --- and both Score-Drums will be resetted. If its "the 100s happens to be on 600, 700, 800 and the 10s happens to be on 10, 20, 30 --- fault - when the 100s are stepped and reach Zero-Position: The reset stops - the Player-Unit steps forward to its Player-Unit-Home-Position - the 10s are not fully resetted.
The Player-Unit is allowed to step WHEN ALL of Player-Two Score-Drums have reached their Zero-Position - when they CLOSE their Zero-Position-Switch (on every drum) --- and when the switch on the 10s Drum is faulty always closed: The brain of the pin believes "All resetted - I (the brain) am allowed to step on the Player-Unit.

Before You dig in into cleaning / adjusting - do this test: Set the 100s Score-Drum of Player-2 to 200 points - and set the 10s Score-Drum of Player-2 to 60 points - then start a new game --- AAA: The 10s Score-Drum steps and reaches its Zero-Position --- BBB: The 10s Score-Drum may step but does not reach its Zero-Position.
The written (theory) above is true - but when You have the BBB: The fault in Your pin is not there ...
Greetings Rolf

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