JLG 1850SJ Service And Maintenance Manual page 500

SECTION 6 - JLG CONTROL SYSTEM
18. Operate jib lift down until the jib stops. When the jib is
at the mechanical stop the operator must hit ENTER
again. The screen will show:
19. When the system completes this step, the next screen
will show:
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20. Press ENTER. The screen should read:
21. Operate jib lift up until the jib stops. When the jib is at
the mechanical stop, Hit ENTER again. The screen will
show:
3121619