Table 1-2 Electrical components Component type Abbreviation Name Switch SW1 Power switch SW2 24V interlock switch SW3 5V interlock switch 1 SW4 5V interlock switch 2 SW5 Primary transfer disengagement switch SW6 Toner collection unit switch SW7 Cassette media end guide position switch SW8 Cassette media width guide position switch Solenoid SL1 Cassette pickup solenoid SL2 Tray 1 pickup solenoid SL3 Duplex reverse solenoid 1 (duplex models only) SL5 Primary transfer disengagement solenoid Fan FM1 Power supply fan SL7 Duplex reverse solenoid 2 (duplex models only) FM2 Fuser fan Photointerrupter (sensor) PS1 Cassette paper-presence sensor PS2 Tray 1 paper-presence sensor PS3 Last-paper sensor PS4 Cassette paper-stack surface sensor PS5 Top-of-page (TOP) sensor PS6 Fuser delivery sensor PS7 Loop sensor 1 PS8 Loop sensor 2 PS9 Fuser pressure-release sensor PS10 Output bin full sensor PS11 Developing disengagement sensor PS12 Black drum home-position sensor PS13 YMC drum home-position sensor PS14 Front door sensor PS15 Right door sensor ENWW Engine-control system 9