Callout  | Item  | Callout  | Item  | 
|---|---|---|---|
[A]  | Bypass Paper Size Sensor  | [C]  | Bypass Feed Paper End Sensor  | 
[B]  | Bypass Feed Roller  | [D]  | Bypass Feed Friction Pad  | 
The bypass paper size sensor [A] is not at the side of the tray but at the side of the bypass paper feed unit.
The bypass paper size sensor is a photointerrupter, which detects when B5 paper or wider is placed in the tray.
The bypass feed paper end sensor is activated if there is no paper on the tray.