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Theory of Operation
4-2-5 Fixing
Toner image on the surface of the paper is in a low state electronically, s o i t c a n b e s c a t t e red easily. By heating
the paper to a high temperature(180°C) and applying pressure(4Kg), the Toner becomes permanently fixed to
the paper, and this fixed image will remain forever. The Heat Roller transfers the heat of Lamp within the
Roller to the paper. T h e e ff e c t o f Tef lo n-coating is to p revent the melted toner from staying on it. The lower
R o l l e r i s t h e P ressure Roller, and is made of silicon re s i n . I t s s u r f a c e i s a l s o Teflon-coated. The thermistor senses
the temperature of the surface of the heat ro l l e r, and feeds back the information to maintain 180°C while
printing, and 135° C during standby. The thermostat prevents the overheat as disconnecting the main power if
the Heat lamp was overheated.
4-2-6 Exit
Printed paper passes through the Exit Sensor after the electrophotography process is completed. The paper also
contacts an Actuator during printing out. This signal is transferred to the Engine Board and indicates paper
position. The Actuator and Exit Sensor must report the correct position information, or a Paper Jam erro r w i l l
be indicated.
Samsung Electronics
4-5
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