Table 7-41. Sensors and Thermistor in Figure 7-29 and Figure 7-30 (continued) PS703 Reversed Paper Sensor (Duplexer) PS801 Paper Feeder Paper Sensor (Paper Feeder) PS901 Envelope Sensor (Envelope Feeder) PS902 Envelope Multiple Feed Sensor (Envelope Feeder) TH901 Fusing Surface Temperature Sensor 7-104 Troubleshooting