Canon PC740 Service Manual - Page 143

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MECHANICAL SYSTEMMI 3. Removing the Blanking Unit 1) Select enlargement mode (141%). • Turn on the power switch, and select 141%. • Press the Copy Start key. • When the lens has moved farthest left, turn off the power. Turn off the power, and disconnect the power plug. 2) Remove the multifeeder assembly. 3) Remove the cartridge. 4) Remove the top cover. 5) Remove the DC controller PCB. 6) Remove the two screws C) from the rear of the composite power supply PCB (:). T U 0 0 7) Open the copier's top unit, and remove the four screws C); then, remove the blanking unit C). 0 Figure 4-404 0 0 0 O Figure 4-403 Caution: When installing the blanking unit, make sure that the blanking unit PCB is farthest to both ends and the copier's lens is at the farthest left. Lamp PCB Figure 4-405 COPYRIGHT 1994 CANON INC. CANON PC72017401750M0 REV.0 AUG.1994 PRINTED IN JAPAN iimPRimt AU JAPONI 4 - 27

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MECHANICAL
SYSTEM
MI
3.
Removing
the
Blanking
Unit
7)
Open
the
copier's
top
unit,
and
remove
1)
Select
enlargement
mode
(141%).
•
Turn
on
the
power
switch,
and
select
the
four
screws
C);
then,
remove
the
blanking
unit
C).
141%.
•
Press
the
Copy
Start
key.
•
When
the
lens
has
moved
farthest
left,
turn
off
the
power.
Turn
off
the
power,
and
disconnect
the
power
plug.
2)
Remove
the
multifeeder
assembly.
3)
Remove
the
cartridge.
4)
Remove
the
top
cover.
5)
Remove
the
DC
controller
PCB.
0
6)
Remove
the
two
screws
C)
from
the
rear
of
the
composite
power
supply
PCB
(:).
T
U
0 0
Figure
4-404
0
0
O
0
Figure
4-403
Caution:
When
installing
the
blanking
unit,
make
sure
that
the
blanking
unit
PCB
is
far-
thest
to
both
ends
and
the
copier's
lens
is
at
the
farthest
left.
Lamp
PCB
Figure
4-405
COPYRIGHT
1994
CANON
INC.
CANON
PC72017401750M0
REV.0
AUG.1994
PRINTED
IN
JAPAN
iimPRimt
AU
JAPONI
4
-
27