Down Sequence Control - Canon imageRUNNER ADVANCE C255 Series Service Manual

Down Sequence Control

■ Down sequence when feeding small-size paper
Fixing Film
(TH02)
Purpose
To prevent fixing offset and deterioration of the Fixing Film by controlling temperature increase at a non paper feed area at
continuous printing of small-size paper (paper shorter than A4R/LTR in width-direction length)
Execution condition/timing
When the detected temperature of the Sub Thermistor (Rear) (TH02) or Sub Thermistor (Front) (TH03) is the designated
temperature or higher for 1 sec or longer, down sequence is entered.
Down sequence is performed in a stepwise manner. If the Sub Thermistor detection temperature reaches the designated
temperature or higher during printing, the down sequence increases by one level and the print speed (ppm) decreases each time
this condition continues for a period of 1 second.
Control ends at job completion.
Control description
Increasing paper interval (to make longer temperature control at a temperature lower than that of normal print) to reduce fixing
temperature in up to 6 stages.
Paper size Speed (mm/s) / (ppm)
A4 ? to ? LTR 200 / 35
135 / 25
Pressure Roller
(TH01)
(TP01)
Small Size
Paper
Non-feed area
Fixing Film
Non-feed area
Thin (60 to 63 g/m2)
Plain 1 (64 to 75 g/m2)
Plain 2 (76 to 90 g/m2)
Recycled 1 (64 to 75 g/m2)
Recycled 2 (76 to 90 g/m2)
Thin (60 to 63 g/m2)
Plain 1 (64 to 75 g/m2)
Plain 2 (76 to 90 g/m2)
Plain 3 (91 to 105 g/m2)
Recycled 1 (64 to 75 g/m2)
TSR_GND
THERM_SR
SHORT1
TM_GND
THERM_M
SHORT2
TSF_GND
THERM_SF
(H01)
(TH03)
NEUTRAL
HOT
Small Size
Paper
Paper type
84
2. Technology
DC Controller PCB
(UN04)
Low-voltage
Power Supply Unit
(UN01)
Print speed (ppm: pages per minute)
1 to 35
1 to 35
1 to 35
1 to 35
1 to 35
1 to 25
1 to 25
1 to 25
1 to 25
1 to 25