Please be specific on your runaway hopper....
1 coin played, 2, 3, 4......5?
Have you tried bars pays? Jackpot pays?
Does it runaway when there are no pays?
What do the payboard wiper fingers show after these pays?
Do any of your X-units work during payouts? (with 2, 3, 4, 5 coins you should hear them working)
Damn, I just got improved internet connection and I don't have to sit all day waiting for pages, and lose my posts, too.
All pay signals go from coin out roller switch, up to odds unit, then to selected X0-unit (or not), and then back down to hopper payboard step up solenoid. Any break gives runaway, so always check all coins in...1 thru 5.