Samsung ML-2851ND/SEE Service Manual page 24

2.2.2.2 Transfer
A transfer roller transfers toner on an OPC drum to the paper.
Life span: Print over 50,000 sheets (In 16~27 )
2.2.2.3 Driver Ass'y
By driving the motor, the system takes power. It consists of a main motor for feeding fuser and duplex
reverse turn.
- Main Motor : DC 24V, Rated RPM : 2170rpm
2.2.2.4 Fuser
It is consisted of a heat lamp, heat roller, pressure roller, thermistor and thermostat. It sticks the toner on a
paper by heat and pressure to complete the printing job.
- Halogen lamp : 750 Watt
1) Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over-heating.
- Non-Cotact type Thermostat
2) Heat roller
The heat roller transfers the heat from the lamp to apply a heat on the paper. The surface of a heat roller is
coated with Teflon, so toner does not stick to the surface.
3) Pressure roller
A pressure roller mounted under a heat roller is made of a silicon resin, and the surface also is coated with
Teflon. When a paper passes between a heat roller and a pressure roller, toner adheres to the surface of a
paper permanently.
4) Items for safety
Protecting device for overheating
- 1st protection device: Hardware cuts off when overheated
- 2nd protection device: Software cuts off when overheated
- 3rd protection device: Thermostat cuts off main power.
Safety device
- A fuser power is cut off when a front cover is opened
- Maintain a temperature of fuser cover's surface under 80(C for user, and attach a caution label at where
customer can see easily when customer open a rear cover.
Service Manual
Product spec and feature
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