Do you have the schematic. Post it here or better on IPDB so we can help you.

There should be a reset relay in the head of the game that pulses when the game is started and keeps pulsing from a cam on the score motor until all the score reels are zero'ed out. Pull the game away from the wall and remove the cover off the back. Start a game, get some scores going on that reel and then have someone restart the game while you are standing back there. When it's resetting, and the reels are moving back to zero, look for a relay that's pulsing, clicking and sparking a bit when the reels reset. Pull that relay out, clean and adjust the switches. There may be two relays back there. One for players 1 and 3 and another for players 2 and 4, so there may be two you may want to look at.

I recently had the same problem w 1 of my games..I cleaned all the eos and checked gaps..still didn't work. I took apart the reel last nite and cleaned the cam and all parts..assembled it and played a few games and happy to report that it reset normally..

there is definitely a switch out of adjustment on the 100 point score reel. I would read about what the reel should do when it is in the 0 position. There is a switch that opens when going between 9 and 0 that is probably not opening. I would take that reel out and manually cycle through the numbers and watch the switches especially when going from 9 to 0. Also take out a working reel and compare the functions of the switches of both reels.

I vote rip the reel apart and rebuild.

-Jeff

Hi Pierre
please explain the "sometimes" --- when the 100 point reel happens to be in Zero-Position; Of course no need for stepping. When the reel happens to be in Position-5, -6, -7, -8, -9: Is it stepped always to Position-Zero - or (only) sometimes ? Greetings Rolf