Lexmark Optra C710, Service Manual

Page: 33 / 369

General Information
1-9
5016-001
Sheet Bypass Paper Feed Unit
Operation of the sheet bypass paper feed unit (multipurpose tray)
When the sheet bypass tray is closed and printing is started,
revolution of the developer/paper feed motor is transmitted to the
clutch gear and timing clutch gear of the sheet bypass paper feed
assembly.
When the bypass paper feed clutch activates, the sheet bypass
paper transfer roll is lowered and touches the paper in the tray.
When the paper transfer roll touches the paper in the paper tray, the
paper is fed into the printer by the actions of the paper transfer roll
and paper feed roll.
As paper is fed to the timing roller by the sheet bypass paper feed
roll, the paper pass sensor detects paper is present. This sensor is
located just prior to the timing roller. After the paper is detected, and
passes through the sensor, the sheet bypass clutch turns off, and
the sheet bypass paper feed and sheet bypass paper transfer roller
stop rotating. At the same time, the paper transfer roller is lifted up
by the return spring so that the paper will touch the timing roll and
wait.
Note: If the transparency paper sensor located in front of the timing
roller detects a transparency, the printer slows to the half speed
mode.
At the same time the image is transferred from the organic photo
conductor (OPC) to the transfer belt, the timing clutch turns on and
the timing roll begins rotating. Paper is then fed into the image
transfer area, registering the image on the sheet of paper.
Double feed prevention
The double feed prevention pad contacts the sheet bypass
paper feed roller at a specific pressure. Whenever multiple sheets of
paper are fed, the bottom sheet is stopped by friction of the double
feed prevention pad, which aids in preventing double feeding. Only
the top sheet of paper is fed by the paper feed roller.
The paper pass sensor checks paper fed from the sheet bypass
paper feed assembly. If the sensor does not detect paper during a
specific time, a paper jam error displays.