Fuser - Samsung SCX-472 series Service Manual

2. Product specification and description

2.2.4.4. Fuser

This unit consists of Heat Roller, a Thermostat, and Thermistor, etc. It fuses the toner that was transferred by the transfer
roller onto the paper, by applying heat and pressure to complete fusing process.
1) Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over- heating.
• Thermostat Type : Non- Contact type Thermostat
Control Temperature : 170℃ ± 5 ℃
•
2) Thermistor
It is a temperature detecting sensor.
Temperature Resistance : 7KΩ (180 ℃ )
•
3) 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.
4) 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 and is permanently fused.
5) Halogen Lamp
• Voltage : 120 V (115 ± 5 %) / 220 V : 230 ± 5 %
• Capacity : 850 Watt ± 25 W
6) 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 ℃ for user, and attach a caution label at where customer
•
can see easily when customer open a rear cover.
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