Okidata Microline 520 Service Handbook
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Brand: OKIDATA
Category: Printer
Type: Service handbook
Model: OKIDATA Microline 520 , OKIDATA Microline 521
Pages: 321
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.
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Microline 520/521 Service Handbook 2 - 31 Principles of Operation
P/N 59257803