Fixing film edge cooling fan (rear)/(front) control

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Fixing film edge cooling fan (rear)/(front) control
Purpose
These fans are used to prevent the sections where paper is not fed from heating excessively when narrow paper (narrower than the A4 size (297 mm)) is fed.
These fans are used for the following purpose when paper wider than the A4 width (297 mm) is fed.
Cool paper that has passed through the fixing unit.
Cool paper to prevent the adhesion of paper interval on the delivery tray.
Overview
[A]: When paper narrower than the A4 width (297 mm) is fed, the air outlet of the paper edge cooling fan (rear)/(front) opens to blow air to both ends of the fixing film, thus cooling the sections where paper is not fed.
[B]: When paper wider than the A4 width (297 mm) is fed, the air outlet of the fixing film edge cooling fan (rear)/(front) closes to cool paper that has passed through the fixing unit and paper on the delivery tray.
Control sequence
1) The shutter motor (M8) is energized and the shutter HP sensor (S10) detects the edge cooling shutter.
2) Aperture width of the edge cooling shutter is depending on the paper size. The edge cooling shutter starts to move when the registration clutch turns ON.

Opening width of the shutter | Paper size
0mm (closed) | A3, A4 (in respective mode other than N1/N3) A3, A4 (in N1/N3 mode and the surface temperature of the pressure roller is 95 degrees C or more.)
18mm | LDR, LTR, A-LTR
23mm | K8, K16
24mm | EXEC, G-LTR, K-LGL
29mm | B4, B5
30mm | A3, A4 (in N1/N3 mode and the surface temperature of the pressure roller is less than 95 deg C.)*1
50mm | LTR-R, LGL, A-LTR-R, OFFICIO, A-OFFICIO, B-OFFICIO, E-OFFICIO, M-OFFICIO, FOOLSCAP, F4A
53mm | A4-R, FOLIO
58mm (opend) | Other than the above-mentioned sizes

*1: The width of the edge cooling shutter aperture can be adjusted by service mode; SERVICE MODE > COPIER > ADJUST > FIXING > ADJ-FNSH (Open width adj of paper edge cooling fan shutter; in N1/N3 mode, A3/A4).
Adjusting value; "0"-"6": Aperture width changes in 0mm – 24mm by 4mm steps.
Adjusting value; "7"-"14": Aperture width changes in 30mm – 58mm by 4mm steps.
3) When Fixing film edge cooling fans (rear/front) (FM1/FM2) and the main body cooling fan (FM6) are ON, their power (full speed, half speed and stop) and width of the edge cooling shutter aperture are controlled by the subthermistor (TH1/TH2).