Panasonic Facsimile UF-590, Service Manual

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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 8,898
rpm (400 dpi) or 13,347 rpm (600 dpi). Scanning speed for 400 dpi and 600 dpi are controlled by motor
clock supplied from SC PCB. Motor clock for 400 dpi is 890 Hz and 600 dpi is 1,335 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 (BD) Lens and Beam Detection (BD) Sensor
The BD Lens receives the reflected light from the Polygon Mirror and redirects it into the BD Sensor,
which converts the laser beam into electrical signals and sets the start timing for the scanning line.
f- θ Lens
This amorphous plastic, molded lens is designed to provide parallel laser light across the surface of the
drum, providing a constant scanning speed.
Fusing and Paper Exit
Fuser Unit (701)
The Fuser Unit, consisting of the Fuser Lamp, Fuser Roller, Pressure Roller, Thermistor, and
Thermostat, bonds the toner into the paper using heat and pressure.
Fuser Lamp (732)
Located in the Fuser Roller is a Halogen lamp that serves as the heat source for the Fuser Roller.
Fuser Unit (701)
Exit Roller (719)
Paper Exit Actuator (730)
Pressure Roller (706)
Fuser Lamp (732)
Fuser Roller (709)
Thermostat (725)
Thermal Fuse (726)
Thermistor Assembly (728)