Canon PC720 Service Manual - Page 106

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MNOPERATIONS AND TIMING 1) Short the two jumper wires (JP3, JP4) on the DC control PCB with a screwdriver. JP4 0 O JP3 U Figure 3-703 2) While shorting the terminals, turn on the power switch. • The scanning lamp will turn on, and the main motor (M1) will start to rotate. 3) Stop shorting the two jumper wires (JP3, JP4). 4) Turn VR103 on the DC controller PCB fully clockwise. 0 JP400.103 VA101 VR106 :0 VR104 0 11105 RIO J102 J117 .003 .1105 I±1 4 .1 11 0 VR 03 Figure 3-704 5) Place a newspaper on the copyboard, and close the copyboard cover. 6) Adjust VR102 so that the indication in the display is b2 through bc. o - .10100.1P3 VRIGI VR105 VA101 .108 t 18 VR102 V13103 ..1102 .1117 J105 1 1 J108 0 " VR 02 Figure 3-705 7) Remove the newspaper from the copyboard, and place a stack of five sheets of copy paper on the copyboard glass in its place; then, close the copyboard glass. 8) Adjust VR103 on the DC controller PCB so that the indication on the control panel is 53 through 5d. 0 1' 0 j1°' 113"2 .10400.103 VR104 1/B105 J402 J117 J1O3 J104 Figure 3-706 VA101 .106 J105 I .1109 0 VR 03 3-66 COPYRIGHT @ 1994 CANON INC. CANON PC72017401750/770 REVD AUG.1994 PRINTED IN JAPAN ompRimt AU JAPON)

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MN
OPERATIONS
AND
TIMING
1)
Short
the
two
jumper
wires
(JP3,
JP4)
o
on
the
DC
control
PCB
with
a
screwdriv-
er.
JP4
JP3
0
O
U
Figure
3-703
2)
While
shorting
the
terminals,
turn
on
the
power
switch.
•
The
scanning
lamp
will
turn
on,
and
the
main
motor
(M1)
will
start
to
rotate.
3)
Stop
shorting
the
two
jumper
wires
(JP3,
JP4).
4)
Turn
VR103
on
the
DC
controller
PCB
fully
clockwise.
0
:0
JP400.103
VR104
0
1
1105
J102
J117
.003
VA101
VR106
RIO
.1105
I±1
4
.1
11
VR
03
Figure
3-704
0
5)
Place
a
newspaper
on
the
copyboard,
and
close
the
copyboard
cover.
6)
Adjust
VR102
so
that
the
indication
in
the
display
is
b2
through
bc.
-
..1102
.1117
.10100.1P3
VRIGI
VR105
VA101
.108
t
18
VR102
V13103
J105
VR
02
Figure
3-705
J108
1
1
0
"
7)
Remove
the
newspaper
from
the
copy
-
board,
and
place
a
stack
of
five
sheets
of
copy
paper
on
the
copyboard
glass
in
its
place;
then,
close
the
copyboard
glass.
8)
Adjust
VR103
on
the
DC
controller
PCB
so
that
the
indication
on
the
control
panel
is
53
through
5d.
0
'
10 j1°'
1
13"2
.10400.103
VR104
1/B105
J402
J117
J1O3
J104
Figure
3-706
VA101
.106
J105
I
.1109
VR
03
0
3-66
COPYRIGHT
@
1994
CANON
INC.
CANON
PC72017401750/770
REVD
AUG.1994
PRINTED
IN
JAPAN
ompRimt
AU
JAPON)