Panasonic UF-585 Service Manual page 186

Transfer and Separation
As the paper is fed between the OPC Drum and the Bias Transfer Roller (BTR) (604), a positive charge of approximately
+2.5 µA steady current is applied to the backside of the paper by the BTR. The toner particles are attracted away from the drum
towards the surface of the paper. During cleaning, the BTR is charged to approximately -1500 VDC to repel toner on the OPC
Drum and prevent toner from being attracted to the BTR. After transfer has occurred, the paper passes over the Discharge
Plate (612) in the Transfer Guide (601), reducing the difference of potential between the OPC Drum and the paper. The
stiffness of the paper causes the paper to separate from the drum.
Cleaning
After transfer, some toner may remain on the surface of the OPC Drum. A Cleaning Blade scrapes the OPC Drum surface, and
the removed toner is moved into the Toner Waste Box, inside the Toner Cartridge.
Laser Unit
LD PCB
Laser Diode
Laser
A 5 mW Laser Diode, with a wave length of 780 nm (±20 nm), provides a modulated beam controlled by nVIDEO. The beam
power on the drum surface is approximately 0.15 mW, and is controlled by the monitor circuit.
Collimator Lens
This lens converges and focuses the laser beam, converting it to parallel light.
Aperture
This controls the size of the laser beam.
Tetragon Mirror and Motor
The tetragon scanner consists of a 4-sided mirror, directly driven by a tetragon motor, revolving at 7,018 rpm (400 dpi) or
10,762 rpm (600 dpi). Scanning speed for 400 dpi and 600 dpi are controled by motor clock supplied from LPC PCB. Motor
clock for 400 dpi is 702 Hz and 600 dpi is 1,076 Hz. The laser beam is reflected against these mirrors and swept over the
recorded width in the scanning direction. This unit features a stable line scanning speed, a precision mirror reflection angle, a
reflection free surface, and instant start.
Beam Detection
Sensor Bean Detection Lens
Collimator Lens Aperture Cylindrical Lens
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F Lens
Laser Housing
Tetragon Mirror
Tetragon Motor