Samsung SCX-82x0 series, Service Manual

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2. Product Description
SAMSUNG ELECTRONICS Service Manual
2-26 2-26
2.4.3 Functions
This section describes the functions of the paper handling components.
Pickup Roller (paper tray and MP tray)
This roller moves up and down and draws out the paper from the bypass tray or drawer and transports it to
the feed roller.
Forward Roller (paper tray and MP tray)
This roller is placed against the Retard roller. It transports the paper from the pickup roller to the
transport roller.
Retard roller (paper tray and MP tray)
This roller is placed against the feed roller. When two sheets of paper or more are transported from the
pickup roller, the load of the torque limiter of the Retard roller is heavier than the frictional force between the
sheets. As a result, the Retard roller is stopped and the lower paper does not advance any further. When
only one sheet is transported from the pickup roller, the Retard roller rotates following the feed
roller.
Transport Roller (paper tray and MP tray)
This roller transports the paper sent from the feed roller to the registration roller.
Registration Roller
Paper transported from the transport roller is pushed against the registration roller which aligns the leading
edge of the paper. Then, the registration rollers rotate to transport the paper to the transfer unit.
MP tray Paper Sensor
This sensor detects whether paper is set in the bypass tray. When it is, MP tray always comes
before drawer feeding.
Empty Sensor (Tray 1 / Tray 2)
This is a transmissive-type sensor and it detects the availability of paper in the drawer by using an actuator.
When there is no paper in the drawer, the actuator blocks the light path of the sensor, and the sensor
determines that there is no paper.
Paper Stock Sensor
This is a transmissive-type sensor which detects the amount of remaining paper in the drawer using an
actuator. When the remaining paper is consumed and approximately 100 sheets remain, the actuator
blocks
the light path for the transmissive-type sensor to detect that there is less paper.
Feed Sensor
This sensor detects if the leading edge or trailing edge of the paper has passed the feed roller. It also
detects jamming such as missfeeding.
Registration Sensor
This sensor detects that the leading edge of the paper has reached the registration roller and that the
trailing edge of the paper has passed the registration roller.