Canon GP200 Service Manual page 298
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3. OPERATIONS AND TIMING
2
Shading Auto Correction
• There are two types of shading auto cor-
rection: for servicing and for factory/R&D.
(3rd screen in *4*)
• In shading auto correction, various data
items are measured, and the results are
stored in RAM on the image processor
PCB. (The stored data will be used as tar-
get value for shading correction executed
before copying operation.)
• Use this mode for the following:
• When replacing the image processor PCB
• After executing 'RAM INIT' in service mode
(*4*)
• Before executing 'copy auto density correc-
tion' in service mode (*4*)
• After replacing the composite power supply
PCB
• After replacing the laser unit
• After replacing the CCD unit
• After replacing the analog processor PCB
Work
1) Open the front door, and insert the handle of
the separation static eliminator cleaning brush
into the fixing assembly releasing opening.
Separation static eliminator cleaning brush
Figure 3-1006
3–244
COPYRIGHT © 1996 CANON INC.
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2
1
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
2) Insert the door switch actuator into the door
switch assembly.
3) Push the service switch with a hex key.
• '$' will be indicated in the upper left corner
of the LCD.
4) Press the * key twice.
• The Service Mode Menu screen will
appear.
<SERVICE MODE>
1
DISPLAY
* *
2
I/O DISPLAY
* *
3
ADJUST
* *
4
FUNCTION
* *
5
OPTION
* *
6
COUNTER
* *
7
ACC
* *
8
FAX
* *
+
Figure 3-1007
5) Press 'FUCNTION' (*4*) on the Menu screen
to highlight; then, press the OK key.
6) Press the Page key
Shading screen (3rd screen).
*3* FUNCTION 03
AUTO SHEADING START (OK)
Now [
WB
H WP
H LAMP H
GDA1
H GD2
CDA4
H ADDA5
D-ODD
H D-EVN
+
Figure 3-1008
7) Press 'AUTO SHADING' on the LCD to high-
light; then, press the OK key.
• 'shading auto correction' will be executed.
8) In a while, 'Now [END]' will appear on the
screen to indicate the end of shading correc-
tion.
CANCEL
–
OK
to bring up the
CANCEL
]
H CDA3 H
H
H
–
OK
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