OKIDATA OF1050, Service Manual

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Page: 145
Service Guide OF1050/2350/2450
Chapter 3 Board Description/Printer Operation
3.21.02. Sensors and switch control
Six types of sensors are used in the printer as listed below. All of their output are processed by the Main
Control (MCNT) board.
Inlet sensor 1
Write sensor (To detect the paper leading edge for printing)
Outlet sensor
Paper end sensor
Toner end sensor
Cover status switch
The functions of various sensors are described in the following table
Sensor Sensor Name Function
PS-3 Inlet sensor 1 This photosensor is
positioned before the
registration roller to detect
whether the paper has
entered into the printer
section.
PS-2 Write sensor Detects the arrival of paper at
designated position on the
paper transport route inside
the printer in order to turn on
the light of the LED head. 0:
Paper exists, 1: Paper does
not exist
PS-1 Outlet sensor Located at the exit of the
printer to supervise the paper
exit operation. 0: Paper
exists, 1: Paper does not
exist
PS-4 Paper sensor Detects the presence of
paper in the paper cassette,
and presence of cassette. 0:
Paper and cassette installed,
1: Paper out, or cassette not
installed
PS-6 Toner sensor Detects the remaining toner
in the toner cartrige.