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.
Figure 3-1009
2) Insert the door switch tool into the door switch
actuator.
3) Press the service switch with a hex key.
• ‘$’ will appear in the upper left corner of the
LCD.
4) Press the * key twice.
• The Service Mode Menu screen will
appear.
Figure 3-1010
5) Press ‘FUCNTION’ on the Menu screen (84*)
to highlight; then, press the OK key.
6) Press the Page key
to bring up the 3rd
screen.
7) Execute ‘shading auto correction’. (See the
descriptions for ‘shading auto correction’.)
8) At the end of ‘shading auto correction’, press
the Reset key once.
9) With the feeder or the copyboard cover open,
make two solid black copies.
10) Check to make sure that ‘$’ is indicated in the
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.)
11) Press ‘FUNCTION’ (*4*) to highlight; then,
press the OK key.
12) Press the Page key
to bring up the PD
Density Auto Correction screen (4th screen).
Figure 3-1011
CANCEL
+
OK
–
*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
1 DISPLAY
2 I/O DISPLAY
3 ADJUST
4 FUNCTION
5 OPTION
6 COUNTER
7 ACC
8 FAX
CANCEL
+
OK
<SERVICE MODE>
* *
* *
* *
* *
* *
* *
* *
* *
–
1
2
Separation static eliminator cleaning brush
3–245
COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING