User manual PowerBox Professional

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The undercarriage should now retract. If not, hold button I pressed in until
the valve is triggered, and the undercarriage retracts. Press the SET button to
move on to the next stage of the procedure.
Connect the nosewheel door servo to output 1. Press the SET button to close
the nosewheel door; repeat the procedure in the next setup screen to open
the door.
The succeeding steps are used to set up the second front wheel door and the
rear wheel doors; the procedure is identical to that described for the nose-
wheel door. The servo for the right-hand wheel door is connected to output 2,
that for the left-hand wheel door to output 3.