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Operations Lower Feeder Unit Theory of Operation
2-8
II Composition/Operation
3.1.9 Paper size detection control
• The Lower Feeder Paper Size Switch (S1 PF) detects the length size (FD) of the paper.
1. The Size Detection Board turns as the Trailing Edge Guide Plate is moved.
2. When the tray is slid into the machine, the Size Detection Board pushes the actuator of
the Lower Feeder Paper Size Switch (S1 PF) installed to the machine frame, thus turn-
ing ON the switch.
3. The combination of ON/OFF positions of the sub-switches of the Lower Feeder Paper
Size Switch (S1 PF) determines the specific paper size that can be either one of the
seven different sizes.
4. If the tray is not slid into position, all of the sub-switches are OFF and the message
“DRAWER OPEN TRAY X” appears.
Lower Feeder Paper Size Switch
Paper size
SW1 SW2 SW3
OFF ON ON Legal (8.5” × 14”)
ON ON ON Government Legal Letter Plus
ON ON OFF A4
ON OFF OFF Letter (8.5” × 11”)
OFF OFF ON B5
ON OFF ON Executive
OFF OFF OFF Lower Feeder Unit not installed
4138to2122c0
Lower Feeder Paper Size Switch (S1 PF)
Size Detection Board
Actuator
Trailing Edge Guide Plate
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