Canon PC720 Service Manual - Page 105

AE/intensity

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OPERATIONS AND TIMINGINN 2. Adjusting the Intensity of the Scanning Lamp Adjust the intensity of the scanning lamp whenever you have replaced any of the following parts: • DC controller PCB • composite power supply PCB • AE/intensity sensor PCB • scanning lamp Preparing for Adjustment 1) Set the black cartridge in the copier. 2) Set the density correction switch (SW101) to the center notch. 0 SW101 Figure 3-701 3) Turn off the AE mechanism, and set the copy density adjusting lever to the center notch. 4) Place the Test Chart (NB-3, NA-2, NA-3) on the copyboard, and make copies. 5) Turn VR101 on the DC controller PCB fully counterclockwise. 6) Turn VR101 on the DC controller PCB so that gray scale No. 9 is barely visible. Direction of VR1O1 and Copy Density Direction Density Clockwise Darker Counterclockwise Lighter Table 3-702 O Of .11, 100JP3 V8104 VP105 V111101 V1111% 18 V14102 VF110.3 J102 J1 1] u J103 J10C .1109 VR O1 Figure 3-702 3. AE Adjustment Execute AE adjustment whenever you have replaced any of the following parts: • DC controller PCB • Composite power supply PCB • AE/intensity sensor PCB • scanning lamp Preparing for Adjustment • Obtain a newspaper with even density; avoid one with photos and large titles. • Obtain five sheets of copy paper. • Make sure that the intensity of the scanning lamp has been properly adjusted. Caution; • Check gray scale No. 10 if you are using NB-3. • If you have turned VR101 fully clockwise, turn it fully counterclockwise before making adjustments once again. COPYRIGHT © 1994 CANON INC. CANON PC7201740R50M0 REV.O AUG.1994 PRINTED IN JAPAN ompagit AU JAPON) 3 - 65

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OPERATIONS
AND
TIMING
INN
2.
Adjusting
the
Intensity
of
the
Scanning
Lamp
Adjust
the
intensity
of
the
scanning
lamp
whenever
you
have
replaced
any
of
the
fol-
lowing
parts:
•
DC
controller
PCB
•
composite
power
supply
PCB
•
AE/intensity
sensor
PCB
•
scanning
lamp
Preparing
for
Adjustment
1)
Set
the
black
cartridge
in
the
copier.
2)
Set
the
density
correction
switch
(SW101)
to
the
center
notch.
0
SW101
Figure
3-701
3)
Turn
off
the
AE
mechanism,
and
set
the
copy
density
adjusting
lever
to
the
cen-
ter
notch.
4)
Place
the
Test
Chart
(NB
-3,
NA
-2,
NA
-3)
on
the
copyboard,
and
make
copies.
5)
Turn
VR101
on
the
DC
controller
PCB
fully
counterclockwise.
6)
Turn
VR101
on
the
DC
controller
PCB
so
that
gray
scale
No.
9
is
barely
visible.
Caution;
•
Check
gray
scale
No.
10
if
you
are
using
NB
-3.
•
If
you
have
turned
VR101
fully
clock-
wise,
turn
it
fully
counterclockwise
before
making
adjustments
once
again.
Direction
of
VR1O1
and
Copy
Density
Direction
Density
Clockwise
Darker
Counterclockwise
Lighter
Table
3-702
O
Of
.11
,
100JP3
V8104
VP105
J102
J1
1]
J103
J10C
VR
O1
Figure
3-702
V1
1
1101
V1
1
11%
18
V14102
VF110.3
.1109
3.
AE
Adjustment
Execute
AE
adjustment
whenever
you
have
replaced
any
of
the
following
parts:
•
DC
controller
PCB
•
Composite
power
supply
PCB
•
AE/intensity
sensor
PCB
•
scanning
lamp
Preparing
for
Adjustment
•
Obtain
a
newspaper
with
even
density;
avoid
one
with
photos
and
large
titles.
•
Obtain
five
sheets
of
copy
paper.
•
Make
sure
that
the
intensity
of
the
scanning
lamp
has
been
properly
adjusted.
COPYRIGHT
©
1994
CANON
INC.
CANON
PC7201740R50M0
REV.O
AUG.1994
PRINTED
IN
JAPAN
ompagit
AU
JAPON)
3
-
65