Canon PC720 Service Manual - Page 73

Operations, Timing, Copyright, Canon, Rev.o, Aug.1994, Printed, Japan, Japon

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. .1OPERATIONS AND TIMING 4. AE Adjustment (VR102, VR103) Make the following adjustments whenev- er you have replaced the scanning lamp or the intensity/AE sensor PCB: Preparing for Adjustment • Obtain a newspaper whose print is as even as possible; avoid one with photos or with large headings. • Make sure you have adjusted the intensity of the scanning lamp. 1) Short the two jumper wires (JP3, JP4) on the DC controller PCB. P4 0 O JP3 741 O 5) Place a newspaper on the copyboard, and close the copyboard cover. 6) Turn VR102 so that the reading in the display is between b2 and bc. 0 12 JR109.122 VR101 VR101 fJ 212102 VR102 J. .1117 J102 .1104 .1105 .J109 0 VR102 Figure 3-321 7) Remove the newspaper from the copyboard, and place a stack of five sheets of copy paper on the copyboard glass instead; then, close the copyboard cover. 8) Turn VR103 on the DC controller PCB so that the reading in the display of the control panel is between 53 and 5d. 0 :0, 01 .12,100.123 V12151 122105 VR101 VR106 Figure 3-319 2) With the terminals shorted, turn on the power switch. • The scanning lamp should turn on, and the main motor (M1) should rotate. 3) Stop shorting the two terminals of the connector J116. 4) Turn VR103 on the DC controller PCB fully clockwise. 0 J112 1/1310.1 126105 VR101 VR106 /5 VRIO V21 0 44)1 J. J112 .1102 .1101 J105 0 VR103 Figure 3-320 J. .1112 .1102 J. 0 VR 03 Figure 3-322 COPYRIGHT 1994 CANON INC. CANON PC7201740f15V770 REV.O AUG.1994 PRINTED IN JAPAN ompromt AU JAPON) 3 - 33

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.
.1OPERATIONS
AND
TIMING
4.
AE
Adjustment
(VR102,
VR103)
Make
the
following
adjustments
whenev-
er
you
have
replaced
the
scanning
lamp
or
the
intensity/AE
sensor
PCB:
Preparing
for
Adjustment
•
Obtain
a
newspaper
whose
print
is
as
even
as
possible;
avoid
one
with
pho-
tos
or
with
large
headings.
•
Make
sure
you
have
adjusted
the
intensity
of
the
scanning
lamp.
1)
Short
the
two
jumper
wires
(JP3,
JP4)
on
the
DC
controller
PCB.
P4
0
O
JP3
7
41
O
Figure
3-319
2)
With
the
terminals
shorted,
turn
on
the
power
switch.
•
The
scanning
lamp
should
turn
on,
and
the
main
motor
(M1)
should
rotate.
3)
Stop
shorting
the
two
terminals
of
the
connector
J116.
4)
Turn
VR103
on
the
DC
controller
PCB
fully
clockwise.
0
J112
1/1310.1
12
6105
J.
J112
.1102
.1
101
Figure
3-320
VR101
VR106
/
5
VRIO
V21
0
44)
1
J105
0
VR103
5)
Place
a
newspaper
on
the
copyboard,
and
close
the
copyboard
cover.
6)
Turn
VR102
so
that
the
reading
in
the
display
is
between
b2
and
bc.
0
12
JR109.122
VR101
J.
.1117
J102
.1104
.1105
VR102
Figure
3-321
VR101
fJ
212102
VR102
.J109
0
7)
Remove
the
newspaper
from
the
copy
-
board,
and
place
a
stack
of
five
sheets
of
copy
paper
on
the
copyboard
glass
instead;
then,
close
the
copyboard
cover.
8)
Turn
VR103
on
the
DC
controller
PCB
so
that
the
reading
in
the
display
of
the
control
panel
is
between
53
and
5d.
0
:0
,
01
.12
,
100.123
V12151
1
22105
J.
.1112
.1102
J.
Figure
3-322
VR101
VR106
VR
03
0
COPYRIGHT
1994
CANON
INC.
CANON
PC7201740f15V770
REV.O
AUG.1994
PRINTED
IN
JAPAN
ompromt
AU
JAPON)
3
-
33