Techno Stuff
How They Work - Timer Unit
Motor Shutdown or Tilt
surf club
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game over
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On games without a R-button, the timer unit steps
up in a kinda random fashion via the yellow
circuit. CU cam #1A closes briefly every revolution
of the control unit motor. The drag arm switch is mounted
on the front of the drag arms, so it closes whenever
one of the drag arm cam lobes pushes an arm away from the
control unit shaft. The timing between switch
#1A closing and the drag arms moving changes due to the
way the drag arms work, so you get a pulse through
once in a while. Eventually the timer unit will
reach step 38, and a switch will get closed by a pin
on the timer unit step-up ratchet. The ratchet is rotating
clockwise, so the pin has to travel all the way around
to close the switch.
On games with an R-button, the timer unit shuts off
the motors just a few steps after the fifth
ball is shot. The timer unit is still advanced
the same way by using drag arm and CU cam #1A switches.
This can lead to a serious problem if the motors
stop during payout (serious as in burned coils and
fires). More infomation on this is posted on the
common problems page.
surf club
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tilt me at step 39
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how they work |
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