Operation; Controlling The Slide Shutters - Canon NP6330 Service Manual

2. Operation

• Opening/Closing Shutter
The opening/closing shutter is located in the optical path for full blanking, and is
opened/closed by a blank shutter solenoid (SL5). A margin is created by opening the
opening/closing shutter operated by SL5 in relation to the leading and trailing edges of
copy paper.
• Slide Shutter
The two slide shutters are located in the optical path for size blanking, and are
positioned by the blank shutter motor (M8).
The blanking shutters serve to create left and right margins by blacking (whiting) out
non-image widths (as in reduced copying).
Total blank optical path
Open/Close shutter
Slide shutter
Pre-exposure
optical path

3. Controlling the Slide Shutters

The front and rear slide shutters are operated simultaneously by the work of the
blank shutter motor (M8).
When the power is on, M8 first rotates the slide shutters to home position; then, M8
starts to rotate to slide the shutters to a specific position in response to the drive pulses
sent from the DC controller according to the reproduction ratio, paper size, and copying
mode.
COPYRIGHT © 1997 CANON INC.
Size blank optical path
Drum cleaner
assembly
Figure 4-112
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Size blanking
reflecting plate
Total blanking
reflecting plate
Photosensitive drum
Image exposure
optical path
4-15