Canon 1730, Service Manual

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Technical Explanation > Fixing System > Controls > Down Sequence Control
Technical Explanation > Fixing System > Controls > Down Sequence Control
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Down Sequence Control
● Down sequence when feeding small-size paper
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 of width-direction length)
Starting conditions:
Down sequence is performed in a stepwise manner. This is a control to reduce
throughput on a step-by-step basis as the detected temperature of the Sub Thermistor
reaches the specified temperature or higher as shown in the table below for
consecutive 400msec during printing.
Stages Normal The 1st stage The 2nd stage The 3rd stage
A temperature to go
for the next stage
235 degrees C 245 degrees C 255 degrees C 260 degrees C
Operation:
Increasing paper interval (to make longer temperature control at a temperature lower
than that of normal print) to reduce fixing temperature in 4 stages at most.
Fixing mode Stages LGL
A4R
LTRR
A5R/B5R
EXE-R/STMTR
Custom
size
Envelope
Plain paper (64 to 90g/m2)
Heavy paper 1 (91to 105g/
m2)
Special Mode N (Medium)
Normal 43/40/30 50/40/30 25 23 ---
1 25 25 20 20 ---
2 20 20 18 18 ---
3 15 15 15 15 ---
Heavy paper 2 (106 to
128g/m2)
Normal 14 21 17 17 ---
1 10 17 14 10 ---
2 8 14 10 8 ---
3 6 6 6 6 ---
Bond paper Normal 13 22 17 17 ---
1 10 15 14 10 ---
2 8 14 10 8 ---
3 6 6 6 6 ---
Transparency Normal --- 17 --- --- ---
1 --- 14 --- --- ---
2 --- 10 --- --- ---
3 --- 6 --- --- ---
Envelope Normal --- --- --- --- 12
1 --- --- --- --- 10
2 --- --- --- --- 8
3 --- --- --- --- 6
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Termination condition:
When the machine detects 175 degrees C or lower for consecutive 400msec after
reaching the 3rd stage, the machine is recovered to move to the 1st stage.
245deg C,400msec
255deg C,400msec
Return
210deg C,400msec
260deg C,400msec
Normal
1st Step
2st Step
3st Step
Related Service Mode
Temperature settings to start down sequence
PRINT > SW > 64
<Setting value>
0: +20 deg C
1: +10 deg C
2: 0 deg C [default: 2]
3: -10 deg C
4: -20 deg C
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