Removing The Pinch Arm Lift Mechanism - HP DesignJet 250C Service Manual

Removing the Pinch Arm Lift
Mechanism
1 Remove the drive roller ' page 6 41.
2 Little by little, unscrew the cam journal
screw on the right side, at the same time
continually pushing the screw in towards
the center of the plotter, until you feel
that you have pushed the cam journal
nut out of the journal.
3 Pull the journal out of the bar cam.
6 44 Removal and Replacement
4 Grasp the cam journal on the left side of
the plotter.
5 Reach around to the front of the plotter
and push the top of the bar cam slightly
towards the rear of the plotter,
simultaneously pulling the cam journal to
the left, so that the cam can begin to slide
out of the left sideplate.
6 Slide the bar cam to the left until it clears
the pinch arm assembly you want to
replace.
7 Remove the pinch arm assembly and
spring from the chassis.
Take care that the spring does not fall.
Pinch arm
C A U T I O N
Reassembling: See following procedure
Bushing
Spring
C4699 90000