HP 750c Service Manual - Page 110
Pinch-arm assembly, Bushing, Spring
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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. Pinch-arm assembly Bushing Spring Pinch-arm assembly 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. 6-58 Removal and Replacement C4705-90000