Paper-size sensor assemblies There are two paper-size sensor assemblies: the quantity switch assembly and the paper-size switch assembly. Removing the quantity switch assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 1 2 2 2 3 2 Figure 161. Paper quantity switch assembly 3 Release two cable stays. 4 Remove one screw (callout 2) and the metal retaining spring (callout 3) that hold the assembly in place. 5 Remove the assembly. Notes about reinstalling: Seat the retaining spring (callout 3) onto the locating pins that are on the chassis. EN 2,000-sheet input unit 311