Photo sensors and switches NOTE: The illustration in this section also shows the product motor, photo sensors, and solenoid. The power switch is not shown. Figure 1-25 Photo sensors, motor, and solenoid PS702 SL2 PS701 M1 PS751 SL1 Table 1-8 Photo sensors, motor, and solenoid 32 Chapter 1 Theory of operation ENWW Item Description M1 Main motor SL1 Pickup solenoid