le mieux c'est d'installer 3 switch stern.
A lot of Cirqus Voltaires have problems with the ball lock on the wireramp. There are three microswitches to detect locked balls. Often these are misadjusted, so balls are not registered. If you lock a ball, it will not stay on the ramp but the game releases it back into play. What also often happens is that the balls stick behind the microswitches and don't get released correctly when multiball starts.
There are several ways to solve this problem.
* At least make sure the game is set at an angle which is steep enough.
* Also check the ramp itself is steep enough. There should be a plastic washer in the middle where it's stuck to the playfield. Some games do not have this (it's part of the upgrade kit for this game) or when the game was 'shopped' the ramp was reassembled in an incorrect way.
* Finally the microswitches have to be adjusted very careful.
One solution is to replace the microswitches with another type (Data East/Sega type of microswitch). These microswitches don't have a long metal blade but a type of rollover (short metal blade with a ball on the end).
I careful adjusted the microswitches on my machine. With the ramp out of the game, I put 3 pinballs on it and started adjusting every switch careful. It has to be bend exactly so you hear it 'click' when the pinball rolls over (so it makes contact), but the blade may not stick high enough so it becomes a ball trap. Because only gravity and the weight of the pinball must be enough to let pinballs roll down when they are released. With the ramp out of the game you can lift each end up or down and let the pinballs roll over the microswitch in every direction (up and down). It took me about 15 minutes to adjust, and since then I've never had any problem again.les infos viennent de là, ça marche nickel.
http://www.flippers.be/pinball/bally/cirqusvoltaire/cirqus_voltaire.html