Fuses Marty, FUSES!
2 of the EM games in my collection I picked up from people as 'not working' and it was a fuse. Given that the thing hasnt seen a game in 10 years, I would say a really good clean of the contacts and coil-sleeves will work wonders. The thing with EM games is they need to be kept 'warm', i.e. they need to be on reasonably frequently and played, to keep things working.
Sandro.