. . . an indepth look at the 120
selections 1725 Stepper . . .
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All selections made on a wallbox,
will be send as pulses to the jukebox. Therefore a special device
has to be mounted inside the jukebox, to translate the pulses into
proper selections again. This device now is called a stepper
or receiver:
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It's placed inside the jukebox, next to the power distribution.
(as you wil see there, both pins and plugs will fall into the
power distribution -  )
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The plug and connector  ,
lying at the bottom of the jukebox have to be disconnected:
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And has to be put into positions 
and  ,
and the cable coming from the wallbox has to be plugged in on 
:
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How the stepper operates
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As explained at the wallbox
page, first the selected page is being transmitted, and
secondly the selected button.
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The incoming pulses will be counted by the
timing relays
and the transfer relays  .
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The no. of the page will be recorded on ,
the group stepper, and the selected button on ,
the unit stepper.
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When resetting the wallbox, the selection on the stepper is
registered on the selector unit assembly.
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Please select the
following operation cycle (permanent lit button)
or feel free to go to one of the other items:
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