Panasonic DF-1100 Service Manual page 202

Panasonic DF–1100
Paper Feed Units No.1 and 2
Paper Feeder Unit No.2 is optional.
Cassette Paper Detection operation
The NP Actuators attached to the Paper Feed Blocks No.1 and 2 determine if there is paper in the cassette.
The paper in the cassette lifts up the NP Actuator, allowing the light from the LED to actuate the
phototransistor. The output signal level (nPCHK1 or nPCHK2) is shown in the table below.
Paper Feed Block No.1
Paper Feed Block No.2
Paper Feed Unit No. 1 Operation
(1) The printing operation begins when the nPRT (Print Request) output signal level goes Low. The Printer
Motor (650) is initialized.
(2) The Paper Feed Solenoid (608) is energized for a specified period of time and turned ON. This activates
the Paper Feed Roller (611), which rotates one revolution. The paper is separated into individual sheets
by the Paper Separation Arm and transported to the Feed Roller (618).
(3) After one revolution the Paper Feed Roller stops, releasing the paper. The Feed Roller transports the
paper to the drum area.
(4) The actual printing process starts at a specified time after the Timing Actuator (627) is activated and stops
at a specified period of time after the trailing edge clears the Timing Actuator.
6–6
Paper in cassette
L
L
No paper
H
H