Brother MFC-9420CN Service Manual page 65

16. ADF Front Sensor
3. Fuser Exit Sensor PU
15. ADF Rear Sensor
11. Temperature Sensor for Fusing Unit
ADF Sensor
12. Output Tray Full Sensor PU
8. OPC Marker Sensor PU
9. Toner Sensor PU
5. OHP Sensor PU
4. Tray Empty Sensor PU
2. Registration Sensor PU
10. Waste Toner Sensor PU
7. Transfer Unit Sensor PU
6. Toner Density Sensor PU
14. Room Temp. Thermistor Sensor PU
1. Paper Size Sensor PU
13. Toner Key Sensor PU
Fig. 3-32
3 - 3 1 Confidential