FP sounds like the reel just doesn't step fast enough. Have you gone through and cleaned it? Springs nice and tight? Losing a point could be either that the next score comes in while the reel is still energized from the previous one (EOS too close), or that the pulse for the score is too short and the EOS isn't keeping the real energized long enough.

TA sounds like it's taking long enough to go from 9->0 that the next 1000s pulse comes in and manages to step the 10k a second time. 9->0 is always the hardest step as it has to move all those 9s+0s switches. Again, need to make sure it's nice and free, and springs strong. Can also help to lessen the tension of all the 9+0s switches (as long as they still close correctly). You definitely want the 9th position switch to open as soon as possible once the reel starts moving to minimize the time that another pulse can get through to the 10k

Most games' score reels have an end-of-stroke switch that makes sure input pulses last long enough. Are those working?

The problem could be in either the score reel, or in the circuit that's driving it. To help isolate the problem you could jumper the coil on the misbehaving score reel with the coil on another score reel that is working properly so that both will get the same pulses. One coil terminal is probably common between all the score reel coils. Just connect the non-common terminal of the misbehaving coil to the non-common terminal of a good one. Maybe pick a score reel that's not next to the misbehaving one to avoid complications when carrying over from 9 to 0. Then make the game do whatever it needs to do to demonstrate the problem. If both score reels demonstrate the problem, the problem is upstream in the driving circuit. If one score reel works properly and the other doesn't, the problem is in the score reel.

/Mark

A lot of similar issues on my Out of Sight went away the more I played it. Same thing, cleaned,adjusted and the high number sticking. Now it works great (after several hundred plays).
Good to clean the individual Relay contacts too!.

Switch dogs on motor set correctly?

Testing good means nothing here, you know they work fine normally. It's a timing issue, as it only occurs when lots of stuff is happening, so just because the switch does open and shut doesn't mean it's opening and shutting fast enough and at the right times.

Also, at some point you're going to just have to accept losing points here and there. It's an EM, losing points is practically built into the rules (can't score 500 while score motor is running, etc). I'd be much more concerned with gaining extra 10ks than losing 100s

Missing the "carry" from 90 to 100 is different from losing points from the motor running. And losing 100 points on a 4 digit score game is significant. The circuit for carries is very simple - only 2 switches.

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