Panasonic UF-890 Service Manual page 220

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 (746), 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.
Paper Feed Unit No. 2 (Optional) Operation
The First Paper Feed Unit always takes priority. The Second Paper Feed Unit becomes operational only
when the first cassette runs out of paper and the NP Sensor is deactivated, causing the nPCHK1 output
signal level to go High. (See Note)
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 (744) is energized for a specified period of time and turned ON. This
activates the Paper Feed Roller (746), which rotates one revolution. The paper is separated into
individual sheets by the Paper Separation Arm and transported to the Intermediate Roller (706).
3. After one revolution the Paper Feed Roller stops, releasing the paper. The Intermediate Roller and the
Feed Roller (618) 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 a specified period of time after the trailing edge clears the Timing Actuator.
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