Oki OL1200 Service Manual page 24

The photosensor mounted on this power/sensor board supervises the paper running state during printing.
Figure 2-3 shows the sensor layout diagram.
Sensor
Inlet sensor 1
Inlet sensor 2
Paper sensor
Outlet sensor
Paper end sensor
Function
Detects the leading part of
the paper and gives the
supervision timing for
switching from hopping
operation to feeding
operation. Supervises the
paper running state and the
paper size according to the
paper reach time and running
time.
Detects the form width.
Detects the leading part of
the paper. Supervises the
paper running state.
Supervises the paper feed
and size according to the
time of arrival to the sensor
and the time of passage of
paper.
Detect the end of the paper.
Sensing state
ON: Paper exists.
OFF: No paper exists.
ON: A4 or larger
OFF: Smaller than A4
ON: Paper exists.
OFF: No paper exists.
ON: Paper exists.
OFF: No paper exists.
ON: Paper exists.
OFF: No paper exists.