After repair the problem i had with scoring the jackpot, following problem occurs.
Playing 3 ball games for one player no problem
Playing 3 ball game for two players , after playing first ball of player two it moves to player three and later on two player four, while the lites in backbox still showing two player game
Playing 3 ball game for three players no problem
Playing 3 ball game for four players no problem

Howard,
But problem is only when playing two players game, all,other one three and four player games works fine

Playing a two playersgame, when second player loose the first ball it does not return to first player, but it switch over to third player and can complete a four players game. Still in backbox it lites two players

Howard,
Ok understand
Ive problems in finding the two points between the red arrows, but wil,give it a try

Howard , thanks
Check wire R-Y-I just the connection between cabinet and backbox and found bad solder almost broken.
Renewed solder and machine runs again without problem
Albert.