Hi Everyone,
New member here and a little history on my EM. I have a 1977 Sonic Butterfly that’s been in the family since it came out, It was at our cottage and I brought it home to restore and keep in my man cave. I’ve cleaned as best I can the leaf switches with the business card trick, cleaned all the stepper units and put some conductive grease on them and massive cleanup of the playing field. I managed to fix quite a few things in the process but I have these 2 lingering problems.
#1 When 100 points get activated, the 100 point relay activates but the coil only releases when it’s “game over”. If the ball drains and a new ball comes into play, the coil still stays activated. I’ve been fiddling with the machine for about a week and only 4 times has the counter worked so I’m thinking it’s dirt somewhere, I’ve cleaned the 100 point relay and the ball index relay, not sure if it’s actually those or if I should look somewhere else?
#2 The Bonus step up/down unit isn’t activating when going into the kick out hole to increase the bonus numbers on the playfield. I’m trying to follow the schematics (found here https://www.ipdb.org/machine.cgi?id=410), ball goes in hole, activates hole relay (E-16) and then activated hole eject coil but doesn’t activate the bonus stepper unit. The stepper unit does work as it does the up/down reset when a new ball comes into play and if I manually step up the coil the lights advance and the points do get counted. If I look at the schematic (D-30) it shows Y-R wire from the hole relay to the stepper unit, when I do a conductive test with my multimeter it does work but it’s odd because it’s at the 5th place on the stepper?
Any help would be greatly appreciated! Also if you can dumb it down since this is my first attempt at repairing an EM
stepper (resized).jpg