Canon imageRUNNER ADVANCE C350 series Service Manual page 134

2
Technical Explanation > Fixing System > Controls > Down Sequence Control
■ Down Sequence Control
● Down sequence when feeding small-size paper
Fixing Film
Pressure Roller
(TH02)
(TH01)
(TP01)
(H01)
Small Size
Paper
Non-feed area
Fixing Film
Non-feed area
2 Technical Explanation > Fixing System > Controls > Down Sequence Control
TSR_GND
THERM_SR
SHORT1
TM_GND
THERM_M
DC Controller PCB
SHORT2
(UN04)
TSF_GND
THERM_SF
(TH03)
NEUTRAL
Low-voltage
Power Supply Unit
HOT
(UN01)
Small Size
Paper
F-2-120
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 that
has smaller than A4R/LTR of width-direction length)
Startup conditions:
When the temperature detected by the Sub Thermistor (Rear) (TH02) or the Sub
Thermistor (Front) (TH03) is at the specified temperature or higher for at least 1 second,
the down sequence starts.
Down sequence is performed in a stepwise manner. If the Sub Thermistor detection
temperature exceeds the designated temperature during printing, the down sequence
increases by one level and the number of prints (ppm) decreases each time this condition
continues for a period of 1 second.
Operation:
Increasing paper interval (to make longer temperature control at a temperature lower than
that of normal print) to reduce fixing temperature in 6 stages at most.
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