Change In Fixing Performance By User Mode (Special Mode) - Canon imageRUNNER 1750 Series Service Manual

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Technical Explanation > Fixing System > Controls > Change in fixing performance by user mode (Special Mode)
● Down sequence when switching paper size
Purpose:
When feeding a sheet with a wider width than a preceding sheet during continuous
printing, temperature at the non paper-feed area of the preceding sheet increases,
and it can cause fixing offset and wrinkles when feeding the succeeding sheet. This
down sequence controls temperature increase at the non paper feed area.
Starting conditions:
When the paper is switched to a wider paper than the preceding sheet during printing,
the detected temperature of the Sub Thermistor is higher than 210 deg C (*1).
Operation:
This is a control to stop pickup of the succeeding sheet and power distribution to the
Fixing Heater to reduce fixing temperature.
Termination condition:
When detected temperature of the Sub Thermistor is 170 deg C or lower (*1).
*1. The temperature differs according to the user mode settings (Special Mode S).
2 Technical Explanation > Fixing System > Controls > Change in fixing performance by user mode (Special Mode)
Non-feed area
Film
Non-feed area
F-2-82

■ Change in fixing performance by user mode (Special Mode)

Changing the control temperature or throughput affects fixing performance in some modes
of special mode settings in user mode. The following describes the mode which affects fixing
performance.
User mode Overview Setting value
Special Mode N This is a mode to set Off
temperature control
(to avoid curl/jam
when any of plain
at a high humidity
Auto
paper, recycled paper,
environment)
(to increase fixing
color paper or 3-hole
performance)
paper is selected on
(Default)
the Control Panel. To
Manual (Medium)
reduce productivity
(to increase fixing
to increase fixing
performance)
performance.
Manual (High)
(to increase fixing
performance)
Special Mode P This is a mode to set Off
temperature control (Default)
(to avoid curl
when any of plain
of thin paper/
Medium
paper, recycled paper,
recycled paper)
(to increase fixing
color paper or 3-hole
performance)
paper is selected on
High
the Control Panel. To
(to increase fixing
reduce productivity
performance)
to increase fixing
performance.
Special Mode G To reduce productivity Off
to increase fixing (Default)
(to increase fixing
performance.
performance of
On
(to increase fixing
heavy paper)
performance)
Special Mode S
To reduce wait time Off
for pickup permission (default)
(to ease
temperature when
deceleration
the paper size is
of print speed
On
changed to prioritize
at temperature
(Priority on
productivity over fixing
productivity)
rising at the edge) performance.
*1 Special Mode N (Medium): -20 deg C of normal control temperature (at pickup from
cassette, when fixing temperature at the start of Startup control is 100 deg C or higher)
*2 Special Mode N (High): -35 deg C of normal control temperature (at pickup from cassette,
when fixing temperature at the start of Startup control is 100 deg C or higher)
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Control temperature/throughput
Normal temperature control
(temperature control for plain paper
mode)
This is a mode to switch between the
normal temperature control and N1
mode (*1) according to the environment
(temperature/humidity).
Special Mode N (Medium) mode
temperature control
Special Mode N (High) mode (*2)
temperature control
Normal temperature control
(temperature control for plain paper
mode)
Thin paper mode temperature control
S-thin paper mode temperature control
Normal control
To reduce throughput by 4 or 5 sheets
This is a control to set the pickup
permission temperature at 210 deg C
and pickup recovery temperature at 170
deg C.
This is a control to set the pickup
permission temperature at 190 deg C
and pickup recovery temperature at 230
deg C.
T-2-38
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