Fixing Pressure Roller Cleaning Sequence; Fixing Film Edge Cooling Control; Paper Loop Amount Control Before Fixing - Canon imageRUNNER ADVANCE 4551i Service Manual

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Fixing pressure roller cleaning sequence

To prevent the dirt of the pressure roller causing the dirt of the paper back side.

Starting conditions

When the detected temperature of sub thermistor (front) or (rear) is higher 18 deg C or more than the one of the main thermistor.

After completion of the last rotation, the temperature control is executed so that the fixing heater turns on and the toner on the

pressure roller is melted to transfer it to the fixing film. After transferring the toner to the fixing film, the fixing motor is rotated

slightly to shift the nip area, so that re-transferring the toner to the pressure roller is prevented.

Completion conditions

This sequence is finished when either following condition is satisfied.

• After 5 seconds (maximum 10 sec) from shifting to the pressure roller cleaning sequence.

• When the next job is started during the pressure roller cleaning sequence.

Related Service Mode

• clean the fixing film

COPIER > FUNCTION > CLEANING > FIX-CLN

• Set fixing cln sequence execution temp

COPIER > OPTION > IMG-FIX > FIX-CLN

When making prints with the paper that the width is shorter than A4, to prevent temperature rise of non-feeding area, the fan

attached near the fixing assembly sends air and cools to the front and rear side of the fixing film.

For details of the fixing film edge cooling control,

Related Service Mode

• Setting for down sequence start temperature

COPIER > OPTION > IMG-FIX > EDG-WAIT

To get a proper image by avoiding a shock when the trailing edge of paper comes out of the registration roles, an appropriate

paper loop is formed between transfer roller and fixing roller.

Registration

"Fixing film edge cooling fan (rear)/(front) control" on page 137

Pressure roller

Loop sensor(S6)

Transfer roller

2. Technology