Canon PC740 Service Manual - Page 108

Vrios, Vrioi, Vr1oo, Vr102, Vr103

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ENE OPERATIONS AND TIMING 5. Adjusting the Leading Edge Margin (registration on timing) Adjust the leading edge margin whenev- er you have replaced the following: • DC controller PCB Preparing for Adjustment Make sure that the leading edge margin is 0.2 to 5.0 mm when the Test Chart is copied. O.2 to 5.O [mm] Figure 3-710 1) Turn VR104 on the DC controller PCB so that the standard is met. 0 J0400033 1 VRIOI VR1OO :0- 40101 VRIOS VR102 VR103 PJ113 VR104 ,1105 3103 It. =J106 el Figure 3-711 Direction of VR104 and Leading Ed e Margin Direction Margin Clockwise Increases Counterclockwise Decreases Table 3-704 6. Fine-Adjusting the Reproduction Ratio Fine adjust the reproduction ratio whenever you have replaced the following: • DC controller PCB Preparing Obtain a multimeter. 1) Before replacing the DC controller PCB, turn on the power switch, and connect the probes to the CP23 and GND of the printed pattern on the DC controller PCB; then, measure the voltage. + probe CP23 - probe GND CP23 GND 0,D 0 IV°6. O O O 0 O 0000 Figure 3-712 2) After replacing the DC controller PCB, measure the voltage as in step 1); then, turn VR106 so that the reading is the same as before replacement. 3 - 68 COPYRIGHT © 1994 CANONINC. CANON PC72017401750fT/0REV.OAUG.1994 PRINTEDIN JAPAN ompRimtAUJAPON)

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ENE
OPERATIONS
AND
TIMING
5.
Adjusting
the
Leading
Edge
Margin
(registration
on
timing)
Adjust
the
leading
edge
margin
whenev-
er
you
have
replaced
the
following:
•
DC
controller
PCB
Preparing
for
Adjustment
Make
sure
that
the
leading
edge
margin
is
0.2
to
5.0
mm
when
the
Test
Chart
is
copied.
Figure
3-710
O.2
to
5.O
[mm]
1)
Turn
VR104
on
the
DC
controller
PCB
so
that
the
standard
is
met.
0
:0-
J04000
3
3
40101
VRIOS
J1
P
13
3103
I.
J106
t=
e
l
VR104
Figure
3-711
1
VRIOI
VR1OO
VR102
VR103
,1105
Direction
of
VR104
and
Leading
Ed
e
Margin
Direction
Margin
Clockwise
Increases
Counterclockwise
Decreases
Table
3-704
6.
Fine
-Adjusting
the
Reproduction
Ratio
Fine
adjust
the
reproduction
ratio
when-
ever
you
have
replaced
the
following:
•
DC
controller
PCB
Preparing
Obtain
a
multimeter.
1)
Before
replacing
the
DC
controller
PCB,
turn
on
the
power
switch,
and
connect
the
probes
to
the
CP23
and
GND
of
the
printed
pattern
on
the
DC
controller
PCB;
then,
measure
the
voltage.
+
probe
CP23
-
probe
GND
GND
CP23
0
,
D
0
IV°
6.
O
O
O
0
O
0000
Figure
3-712
2)
After
replacing
the
DC
controller
PCB,
measure
the
voltage
as
in
step
1);
then,
turn
VR106
so
that
the
reading
is
the
same
as
before
replacement.
3
-
68
COPYRIGHT
©
1994
CANON
INC.
CANON PC72017401750fT/0
REV.O
AUG.1994
PRINTED
IN
JAPAN
ompRimt
AU
JAPON)