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Service Guide ML520/521
Chapter 2 Principles of Operation
Cut Sheet/Continuous Sheet Switching Mechanism
Top Feed (for cut sheet paper)
When cut sheet paper is used during normal operation or by the Cut Sheet Feeder (CSF) option, place the
change lever in the Top Feed position.
As the platen turns, the platen gear causes the idle gear to rotate.
At this time, the rear and front pressure rollers are pressed securely to the platen to feed the cut sheet.
The cut sheet detection lever enables the cut sheet detection switch (which is located on the main control
board). This places the printer in the cut sheet mode.
When cut sheet paper is placed between the platen and the paper chute, the printer automatically feeds
the sheet to the print start position.
Rear/Bottom Feed (for continuous feed paper)
When the continuous feed paper is used, either with the rear tractor, optional bottom tractor or optional
pull tractor, place the change lever in the Rear/Bottom Feed position.
When the change lever is placed in this position, the reset spring pushes the change gear. In this position,
the idle gear is engaged with the bottom tractor unit drive gear and the tractor gear. As the platen turns,
power is transferred from the platen gear, to the idle gear, to the change gear, and then to the push tractor
shaft.
CAUTION:
The cut sheet / continuous sensor lever must be positioned below the BASW sensor. The lever should
contact the sensor only when the change lever is in the top feed (middle) setting.
If the lever is not correctly positioned, the ALARM lamp will light and the unit will not automatically load
paper or receive data.