The fixing temperature control detects the surface temperature of the fixing heater. It controls the drive signals of the fixing heater and maintains its temperature at

the targeted temperature.

Engine controller PCB

AC input

IC201

CPU

The temperature control of the fixing heater is performed by the following four modes.

1) Initial temperature control

This control initializes the temperature of the fixing heater at the normal targeted temperature after the print command is input to the engine controller.

2) Normal temperature control

This control maintains the temperature of the fixing heater at the normally targeted temperature during print operation.

The target temperature may be any of 7 settings, used according to the selected fixing mode. Any of these modes is selected according to the settings of the driver

and such parameters as paper size and the number of printouts.

The following shows the relationship between the paper type setting and the fixing mode in relation to the fixing target temperature:

2-24

FU101

Q101

SSR101

+3.3V

FSRD

Fixing heater drive circuit

RLYD

FSRTH

Fixing control circuit