Figure 5-15 Printer Sensors, Solenoids, Clutches, Motors, and Fans Paper Size Switches (Trays 2 and 3) The paper guides in Trays 2 and 3 operate four levers at the back of the trays that activate the size sensing switches (SW1601 through SW1604) mounted in the printer chassis. Paper sizes are compared to switch conditions in table 5-2. Table 5-2. Paper Size Switches Paper Size SW1601 SW1602 SW1603 SW1604 Ledger (portrait) OFF OFF OFF OFF 204 Chapter 5 Functional Overview C4265-90907