Develop QC 2235 Plus Service Manual page 104

Fusing section
16.3 Operation
16.3.1 Fusing Roller drive control
A. Speed change control
• Drive for the Fusing Unit is provided by the Fusing Drive Motor.
• To prevent poor fusing performance, the speed of the Fusing Drive Motor is changed in
three steps according to the type of paper used and the copy mode.
Paper Type/Copy Mode
Plain paper/Monochrome
Plain paper/ACS or color
Special paper, high gloss paper
B. Speed stabilization
• To prevent double transferred image or brush effect, the difference between the fusing
speed and paper transport speed during image transfer is corrected.
• The fusing speed is made either faster or slower than the system speed.
• The two-step speed control is accomplished using the Fusing Paper Loop Control (sole-
noid) and planetary gears. When the Fusing Paper Loop Control (solenoid) is deener-
gized, the planetary gears rotate, which sets lower speed. When the solenoid is
energized, the planetary gears stop and the higher speed is selected.
Fusing Paper Loop Control
Solenoid (SL1)
QC 2235plus Theory of Operation Ver.1.0 Feb. 2004
Fusing Speed (mm/sec)
165
100
60
Fusing Drive Motor (M2)
Planetary gear
2-74
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