Xerox Phaser 3450 Service Manual page 140

11.2.2.6 Printing Section
The toner on the surface of a paper, which passed the transfer section is at a low electric state. Therefore, it can easily
spread. At this point, high temperature of 180°C and pressure of 4.5 Kg are applied to permanently stick the toner to the
paper. The resulted image remains permanently. The heat roller transfers the heat from the internal heat lamp to the
surface to apply the heat to the paper that passes the surface. The melted toner due to the heat does not stay on the
surface of the Teflon coated heat roller. The pressure roller located on the bottom of the heat roller is made from Silicon
Resin and it's surface is also coated with Teflon. The thermistor of the printing section senses the temperature of the heat
roller and feedback the information to maintain 185°C during printing mode and 175°C at standby mode. The thermostat
used as secondary safety feature prevents overheat by turning off the main power when the heat lamp is overheated.
11.2.2.7 Exit
The paper that completed the electric photo process exits the printer through the Exit Sensor. The detected signal is then
sent to the engine to inform the location of the paper. When the actuator and senor mal functions, Paper Jam 2 error will
be displayed.
Thermistor
Spring
Heat Lamp
Heat Roller
Paper
Toner
Pressure
Roller
CIRCUIT DESCRIPTION
Service Manual
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