Drive; Fuser; Thermostat; Heat Roller - Ricoh G186 Service Manual

Life span: Over 150,000 printed sheets (16 to 27°C)

6.2.3 DRIVE

The drive system consists of the main motor for feeding fuser and duplex reverse turn, and
the development motor for the toner cartridge.
Main Motor: DC 24V, 1604 rpm
Development Motor: DC 24V, 1424 rpm

6.2.4 FUSER

The fuser consists of the heat lamp, heat roller, pressure roller, thermistor and thermostat.
It bonds the toner to the paper with heat and pressure to complete the printing job.
E-coil Heater: 1,300 W ± 50W

Thermostat

When heat lamp overheats, thermostat cuts off the main power to prevent overheating.
Non-Contact type Thermostat

Heat roller

The heat roller transfers heat from the e-coil to apply heat on the paper. The surface of the
heat roller is coated with Teflon, so toner does not stick to the surface.

Pressure roller

The pressure roller mounted under the heat roller is made of silicon resin, and the surface
is also coated with Teflon. When a sheet of paper passes between the heat roller and
pressure roller, toner adheres to the surface of the paper permanently.

Items for safety

Protecting devices from 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
Fuser power is cut when the front cover is opened
Exercise caution when servicing parts near the fusing unit. Allow the fuser cover
surface to cool to under 80°C to avoid burns.

6.2.5 LSU (LASER SCANNER UNIT)

The LSU is the core part of this laser beam printer which switches from the video data
received to the controller to the electrostatic latent image on the OPC drum by controlling
SM 6-5
System Layout
G186