just to make sure, you're getting ALL the features affected by the coils between schem A27 and A33, and you're checking for 50V on wire 14-8 on a cycle when a feature enabled (trip relay tripped and/or the magic line/super card unit stepped)?
the way it should work is you leave the meter connected on wires 70 and 14-8 and cycle the machine - typically by manually closing the start relay since the meter is probably back there. You should see 50V at the end of the cycle most of the time to begin with, then less frequently as scores increase.
if you don't see 50V on a cycle that something happened with a feature coil, take a look at how the slip ring wipers are connecting on the spotting wiper hub. For example, wire 14-8 should connect to the spotting wiper running around the third ring of rivets from the outside.
unfortunately, the slip ring wiring is not in the manual. It's on a piece of paper on the game, but the resolution/focus point of my picture below isn't good enough to read it.
the only thing I can think of is the slip ring wipers are in the wrong grooves. If it's not that, then some rewiring must have been done someplace.
for the scores reaching max, the odds may be very small. Check:
- manually step up the unit and make sure it will physically reach the top stop. Sometimes the operators wound the return spring too tight so it can't.
- look for misadjusted open-at-top switch on side of score unit and make sure it's not opening on the penultimate step
if it's neither of those, you need to prove the circuit can work.
1] reset game
2] manually step the score unit to step 7 (48/100/192 level)
3] jumper wire 30 to wire 65-3 on the spotting unit (or turn the mixer 3 rotor backwards until you see 50V between wires 80-3 and 70).
4] turn the spotting wipers backwards to a position where the wiper finger on the outer ring is sitting on a 91-3 rivet (manual page 27)
5] manually lift up the CU 7 switch stack (yeah, remove backglass and flip down the panel for access).
the score unit should step to the top step.
if you want to just bypass all the feature proportioning for testing, you can jumper wire 65-4 to 80-3 on mixer 3 and reset the reflex unit wipers all the way....then score advance is only determined by where the spotting wipers stop.
where is wire 65-4 and 80-3 on mixer 3? well, there's not many wires so hopefully you can tell the colors. If not, it's probably the same as gay time....attached below. This is one reason we want to make the diagrams for the mixers. The other reason is calculating the odds so you know if 100+ cycles and not getting something is reasonable
confusing tmi explanation below:
first, look at the score unit and note at step 7, the score unit single step wiper 45-6 is connected to rivet 91-3. 91-3 is coming from the spotting disc, so on the spotting disc diagram find that rivet(s). There's 4 of them on the outer ring, and possibly two more if the B rivets are jumpered to 91-3 on the wire lugs.
ignoring score-extra-step, that gives you a chance for score advance to top step of 4/50 (or 6/50 with B rivets connected) from the spotting disc part of the circuit.
that just leaves whether the spotting wiper is eventually connected to wire 30. You need a circuit path thru all that stuff around schem I20. The more features enabled, the less likely there's a complete circuit. And you're at the mercy of the mixer 3 rotor position....affect unknown since we don't have a blueprint for that assembly (yeah, nag, nag again :-)), but if it's like gay time, it's somewhere around 6/24 to 10/24, depending on enabled features.
worst case, multiply 4/50 * 6/24 and you get 24/1200 = 2% ... not counting the reflex unit and mixer 1. If the reflex unit is not reset enough to bypass mixer 1, and if mixer 1 was about the same as gay time diagram in post 7 above (wire 75-10 on variety = wire 75-5 on gay time), then mixer 1 cuts the odds in half again.
so for worst case, statistically it would take 100 cycles on average to get the odds to jump from step 7 to the top step.
if it costs you 100 coins/credits to get the scores from 48/100/192 to 64/200/300, that's a terrible return on investment. 'course, if the reflex is hooking up more circuits or there's not many features enabled, it should take maybe 30-40 coins/credits to get the score jump....still a profit generator for the operator if you only get 3-in-line.