Canon imageRUNNER 2520 Series, Service Manual, Page: 84 / 402

User mode Summary Setting value Temperature control/produc-
tivity
Special Mode P (To
prevent a curl of thin
paper/ recycle paper) The fixing mode is changed when either of
the plain/ recycled/ color/ 3-hole paper is
selected in the control panel. The produc-
tivity is reduced and fixing grade is im-
proved. Off (Default) Normal temperature control
(Plain paper mode)
Medium (Fixing grade is im-
proved) Thin paper mode temperature
control
High (Fixing grade is improved) S-thin paper mode temperature
control
Special Mode G (To
increase the fixing
grade for heavy pa-
per) The productivity is reduced and fixing grade
is improved. Off (Default) Normal control
On (Fixing grade is improved) The productivity is reduced by 4
sheets or 5 sheets.
Special Mode G (To
increase the produc-
tivity during down se-
quence) The down sequence time is reduced when
switching the paper size. The fixing grade
is reduced and productivity is improved.
(*3) Off (Default) Temperature difference between
the main and sub thermistors to
start the paper feeding: 20 deg C
On (Productivity is improved) Temperature difference between
the main and sub thermistors to
start the paper feeding: 30 deg C
Special Mode F (To
reduce the wait time
during rotation/ colla-
tion adjustment
mode) The down sequence time is reduced in the
collation adjustment mode. The fixing
grade is reduced and productivity is im-
proved. Image Priority (Default) Temperature difference between
the main and sub thermistors to
start the paper feeding: 20 deg C
Speed Priority 1 (Productivity is
improved) Temperature difference between
the main and sub thermistors to
start the paper feeding: 40 deg C
Speed Priority 2 (Productivity is
improved more) Temperature difference between
the main and sub thermistors to
start the paper feeding: 60 deg C
*1. N1 mode: "Normal temperature control" -24 deg C (when the cassette feeding, and the fixing temperature is 100 deg C or
more at the start of warm-up control.)
*2. N3 mode: "Normal temperature control" -48 deg C (when the cassette feeding, and the fixing temperature is 100 deg C or
more at the start of warm-up control.)
*3. The setting of rotation/collation mode is given priority to over this setting.
■ Paper loop amount control before fixing
Purpose:
• 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.
Pressure roller
Fixing film
Drum
Loop sensor(S6)
Transfer roller
Registration
roller
Sensor: OFF
Sensor: ON
Starting conditions:
• This control is performed at every paper feeding.
Operation:
2. Technical Explanation
74