Canon PC740 Service Manual - Page 107

PC720/7401750M0

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OPERATIONS AND TIMING= 9) Make a copy, and make sure that it is free of fogging yet its text is dark enough. • If the copy is foggy or the text density is too light, repeat starting with step 1). • If no change is noted in the results after re-adjustment, make further adjustments using the density correction switch (SW101). 4. Adjusting the Leading Edge NonImage Width Adjust the leading edge non-image width whenever you have replaced the following: • DC controller PCB Preparing for Adjustment Make sure the leading edge non-image width is 2.0 ±1.0 mm when the Test Chart is copied. 0 SW101 Figure 3-707 2.0± 1.0 [aim] Figure 3-708 1) Turn VR105 on the DC controller PCB so that the standard is met. O Jpal]Ova V2104 V2205 E 221101 22002 18 V0102 V0103 J105 I 12 VR105 Figure 3-709 .009 O " Direction of VR105 and Leading Edge Non-Image Width . Direction Width Clockwise Increases Counterclockwise Decreases Table 3-703 COPYRIGHT © 1994 CANON INC. CANON PC720/7401750M0 RED AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 - 67

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OPERATIONS
AND
TIMING=
9)
Make
a
copy,
and
make
sure
that
it
is
free
of
fogging
yet
its
text
is
dark
enough.
•
If
the
copy
is
foggy
or
the
text
density
is
too
light,
repeat
starting
with
step
1).
•
If
no
change
is
noted
in
the
results
after
re
-adjustment,
make
further
adjustments
using
the
density
correc-
tion
switch
(SW101).
0
Figure
3-707
SW101
4.
Adjusting
the
Leading
Edge
Non
-
Image
Width
Adjust
the
leading
edge
non
-image
width
whenever
you
have
replaced
the
following:
•
DC
controller
PCB
Preparing
for
Adjustment
Make
sure
the
leading
edge
non
-image
width
is
2.0
±1.0
mm
when
the
Test
Chart
is
copied.
Figure
3-708
2.0±
1.0
[aim]
1)
Turn
VR105
on
the
DC
controller
PCB
so
that
the
standard
is
met.
O
Jpal]Ova
V2104
V2205
I
12
VR105
Figure
3-709
221101
22002
E
18
V0102
V0103
J105
.009
O
"
Direction
of
VR105
and
Leading
Edge
Non
-Image
Width
.
Direction
Width
Clockwise
Increases
Counterclockwise
Decreases
Table
3-703
COPYRIGHT
©
1994
CANON
INC.
CANON
PC720/7401750M0
RED
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)
3
-
67