i try to repair a William Space Shuttle (System 9)
bad display :i change caps and resistor on power supply : +100 and -100v Ok, the display works
No EPROM : I burn the 2 epprom : Test sound and voice ok, lamp test and solenoid test ok (except right flip)
All solenoid fire on power up : I replace the NE555 : Fix it
One solenoid was burning : change the 2 related transistor : Fix it (he fire on startup, but i read it's happen on williams)
also change the batterie : Didn't show the game id anymore on startup; but show the number of credits and 00 on player one instead.
I press Sound test switch on cpu : sound and voice ok
i press Test switch on cpu : all lights flash one after one (look like test all), and still 0 on cpu digit (test ok ?)
i can run test (lights, sound and coils) via the door switch
MY PROBLEM :
I can add credit through the coin switch (it make sound and add credit on the display), but when i press the Add player/start game bouton, all coils fire a second together, and nothing happen. (no game start )
Any idea ?
Thank you for your help (and sorry for my poor english)