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G. Controlling
the Blank Exposure
System
1.
Outline
The .copier performs blank exposure in two
ways as described
below to prevent excessive
adhesion of toner on the drum.
.
Blank Shutter
2.
a.
Except when the document
is exposed,
the
light of the pre-conditioning
exposure
lamp is
reflected
against
the
blank
shutter
and
led
onto the drum.
.
.
Blank Exposure (front/rear)
When
the document
is exposed
for
RE-
DUCTION,
the light of two fuse lamps (front
and rear of blank exposure
lamp) is led onto
the drum.
Mechanism
Blank Shutter
Document
Not Exposed
/
Blank shutter solenoid is OFF,
Blank shutter is opened,
Preconditioning
exposure
lamp
not
.
blocked.
Document
Exposed
Blank shutter solenoid is ON,
Blank shutter is closed,
Pre-conditioning
exposure
blocked.
lamp
Document
not exposed
Preconditioning-
exposure
lamp
Photosensitive
drum
Blank
exposure
shutter
solenoid
(BKSL)
OFF
Figure 3-24
Document
exposed
Preconditionin
expowre
lamp
Figure 3-25
3-20
COPVAI6HT
019AB
CANON INC.
CANON HP-IOIO
REV.0 DEC. 198E PAINTEA
IN JAPAN IIMPRIME
AU JAPONI
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