The Variator cam and (Jackpot control cam.fitted only to club electro's)
The Variator is a timer controlled cam which basically stops the reels from running in a sequence.
Variator or scrambler described on some schematics cam is made in raised steps of unequal size, It these steps that the cam switch rolls over and in turn causes the switch to make and break a circuit.
This circuit is connected to the main game control timer.
The main game control timer has a 3 second revolution so without the variator it would normally take it 3 seconds to complete it's 360 degree in every game cycle.
Once the start button is pressed and the main control timer sets off on it's cycle and the game begins,Just before the reel solenoids lift to let the reels spin the switch running on the variator cam takes control of the circuit to the main control tmer motor.
Because of the make and break action or the variator cam switch, the circuit to the control timer motor is now switched with an on/off action as the variator cam turns.
It's during the reel spin and while the variator has control of the circuit that the control timer motor cycle is increased anywhere between 3&5 seconds.
It is this difference in the rotation time of the main control timer that in turn makes the difference in the release point of the reel solenoids.This is measured in m/sec but enough to stop the reels running in sequence.
The variator returns control of the main control timer to finish it's cycle once all three reels have stopped.........
The Jackpot control cam is designed to reduce the chances of gaining any of the higher jackpot wins.At best it could be called a % control.I always thought it was an illegal device.
Having said that,It was a known feature the Gaming Board were aware of at the time.
Again much like the variator cam,It has a similar stepped cam.The difference was that the jackpot control cam was wired to a set of studs on reel board 2.
The reel drum wipers on reel 2 passing over the wired studs would complete a circuit actually wired to the number 2 reel solenoid.
The jackpot control circuit wired to the studs would correspond exactly in the same position as the highest jackpot symbols position on the reel drum.
The switch on the jackpot control timer would operate with the similar make or break circuit to the wired studs.
If the circuit from the jackpot control switch is active when the jackpot symbol drops onto the win line,The active circuit prevents the reel 2 solenoid from dropping until the symbol has gone past the win line,The wipers have now passed by the wired studs breaking the circuit and allowing the solenoid to drop.
Players can notice this action when the second reel appears to skip.
Because the electro club was normally a four reel machine,the control circuit on reel two would prevent wins from left to right,right to left and all four reels where the top jackpot symbols were concerned.
To assist this action you would always find only one jackpot symbol on reel two.