HP 750 - Manual (Page 110)

6 Hold the cam journal on the left side of the plotter with your left hand.
7 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 bar cam can
begin to slide out of the left sideplate.
Reassembling: Position the bar cam between the left and right sideplates, or the lift
mechanism will not work.
8 While pressing the rightĆmost pinchĆarm assembly towards the rear of the plotter against its
spring tension, slide the bar cam left until it clears that pinchĆarm assembly.
9 Remove the pinchĆarm assembly and spring from the chassis.
Take care that the spring does not fall.
10 Repeat the steps 8 and 9 until all of the pinchĆarm assemblies have been removed or until
you have removed the pinchĆarm assembly that is to be replaced.
Pinch-arm assembly
Bushing
Spring
Pinch-arm assembly
6-58 Removal and Replacement C4705-90000