Controlling The Fixing Roller Temperature; Overview - Canon iR C6800 Series Service Manual

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9.3.2 Controlling the Fixing Roller Temperature

Each of the heat rollers of the fixing assembly is controlled based on the output of the main thermistor mounted in

contact with the center of the roller. The sub thermistor mounted in contact with the edge of the roller is used to detect

overheating at the edge of the roller, which can occur when small size paper (e.g., A4R) is move past continuously.

The mechanisms used to control these individual heat rollers are as follows:

DC controller PCB

MAIN_HEAT_ON

PRESS_HEAT_ON

PRESS_TR_ERR

AC driver PCB

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