High Capacity Feeder Control Components - Lexmark W820 Service Manual

High Capacity Feeder Control Components

The HCF Control is made up of one several major components.
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Service Manual
HCF PWB
The HCF PWB controls all HCF functions, executes commands sent from the MCU
PWB, and sends information back to the MCU PWB. All HCF components are
connected directly to the HCF PWB.
L/H Interlock Switch
Monitors the Left Cover position.
Feed Motor
Provides most of the mechanical drive for the HCF.
Lift Motor 3
Raises the paper tray in Feeder 3.
Lift Motor 4
Raises the paper tray in Feeder 4.
Lift Motor 5
Raises the paper tray in Feeder 5.
Feed Clutch 3
Transmits Feed Motor drive to Tray 3 Feed Rolls.
Feed Clutch 4
Transmits Feed Motor drive to Tray 4 Feed Rolls.
Feed Clutch 5
Transmits Feed Motor drive to Tray 5 Feed Rolls.
Tray 3 Take Away Sensor
Monitors paper travel arriving at the Take Away Rolls in Feeder 3.
Tray 4 Take Away Sensor
Monitors paper travel arriving at the Take Away Rolls in Feeder 4.
Size Sensors 3, 4, and 5
Monitors the size of the paper loaded in a Feeder. The Actuator Assembly located at
the rear of the Paper Tray has series of cams that face the Size Sensor PWB.
Pushing the Paper Guide against the paper stack slides the Actuator Assembly
along a track. When the Tray is inserted into the Feeder, the cams on the Actuator
press the switches on the Size Sensor PWB in a pattern unique to the position of the
Paper Guide. The MCU PWB interprets this pattern as a specific paper size.
No Paper Sensors 3, 4, and 5
Monitors the paper level in a Feeder. When the Lift Motor raises the Bottom Plate,
the Plate raises the paper stack, the stack pushes the No Paper Actuator up and
away from the No Paper Sensor. The Sensor sends a paper present signal to the
MCU PWB. When the last sheet of paper is fed out of the Paper Tray, the No Paper
Actuator drops through a cutout in the Bottom Plate. The Actuator then blocks the
Sensor, and the Sensor sends a no paper signal to the MCU PWB.
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