Canon GP200 Service Manual page 299

3 Copy Density Auto Correction
• There are three types of copy density auto
correction: execute the three types as a
single set. (You must have executed 'shad-
ing auto correction' before executing this
mode.)
q PD density auto correction
w 200PWM density auto correction
e 600PWM density auto correction
• This mode is executed to correct the fol-
lowing:
q Laser characteristics
w Developing bias
• Execute this mode for the following:
• When replacing the laser unit
• When replacing the copier power supply
PCB
• When image faults occur
• When replacing the image processor PCB
Operation
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 3-1009
2) Insert the door switch tool into the door switch
actuator.
3) Press the service switch with a hex key.
• '$' will appear in the upper left corner of the
LCD.
COPYRIGHT © 1996 CANON INC.
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4) Press the * key twice.
5) Press 'FUCNTION' on the Menu screen (84*)
6) Press the Page key
7) Execute 'shading auto correction'. (See the
8) At the end of 'shading auto correction', press
9) With the feeder or the copyboard cover open,
10) Check to make sure that '$' is indicated in the
2
11) Press 'FUNCTION' (*4*) to highlight; then,
12) Press the Page key
1
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING
• 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 3-1010
to highlight; then, press the OK key.
screen.
descriptions for 'shading auto correction'.)
the Reset key once.
make two solid black copies.
upper left corner of the LCD, and press the *
key once.
• The Service Mode Menu screen will
appear. (If '$' is not indicated, press the
service switch, and press the * key twice.)
press the OK key.
Density Auto Correction screen (4th screen).
*4* FUNCTION 04
PD PRINT (START)
WHITE MEASURE (OK)
DENSITY SANPLING (OK)
DATA SET (OK)
A= B= D=
00 00 00 00 00 00 00
00 00 00 00 00 00 00
MUTI 0
>CASETTE1 A4
CASETTE2 A4
+
Figure 3-1011
CANCEL
–
OK
to bring up the 3rd
to bring up the PD
CANCEL
–
OK
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