Canon PC770 Service Manual - Page 75

Controlling, Blank, Exposure

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OPERATIONS AND TIMINGMUM H. Controlling the Side Blank Exposure 1. Outline The copier is equipped with a side blank exposure lamp at the front and the rear to prevent adhesion of toner to the drum when reduced copies are made. 2. Operation The side blank exposure lamp moves based on the travel distance of the lens as measured by the lens travel detecting shaft for reduced copies for blanking out the nonimage areas. Rear side blank exposure lamp Reflecting plate Lens travel detecting shaft Front side blank exposure lamp A + B (front) Figure 3-324 Reflecting plate A Photosensitive drum Non-image area (REDUCE) A : position of the side blank exposure lamp at time of DIRECT/ENLARGE. B : position of the side blank exposure lamp at time of REDUCE. Figure 3-325 COPYRIGHT © 1994 CANONINC. CANON PC7208401150M0 REIM AUG.1994 PRINTEDIN JAPANoinimt AU JAPONI 3 - 35

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OPERATIONS
AND
TIMING
MUM
H.
Controlling
the
Side
Blank
Exposure
1.
Outline
2.
Operation
The
copier
is
equipped
with
a
side
blank
The
side
blank
exposure
lamp
moves
exposure
lamp
at
the
front
and
the
rear
to
prevent
adhesion
of
toner
to
the
drum
when
reduced
copies
are
made.
Rear
side
blank
exposure
lamp
Lens
travel
detecting
shaft
Reflecting
plate
A
+
B
based
on
the
travel
distance
of
the
lens
as
measured
by
the
lens
travel
detecting
shaft
for
reduced
copies
for
blanking
out
the
non
-
image
areas.
(front)
Figure
3-324
Front
side
blank
exposure
lamp
Reflecting
plate
Photosensitive
drum
A
Non
-image
area
(REDUCE)
A
:
position
of
the
side
blank
exposure
lamp
at
time
of
DIRECT/ENLARGE.
B
:
position
of
the
side
blank
exposure
lamp
at
time
of
REDUCE.
Figure
3-325
COPYRIGHT
©
1994
CANON
INC.
CANON
PC7208401150M0
REIM
AUG. 1994 PRINTED
IN
JAPAN
oinimt
AU
JAPONI
3
-
35