Canon iR8500 Service Manual page 719

SERVICE MODE
COPIER>FUNCTION
SHDG-POS
Use it to enter data for changing the position of measurement on the stan-
dard white plate used for shading correction.
Range of
adjustment 216 to 296 (a multiple of 8 causes a shift of about 0.189 mm)
SH-PS-ST
Use it to execute optimum position auto adjustment for the standard white
plate for shading correction.
<Using the Mode>
1) Clean the back of the copyboard glass.
2) Open the ADF (copyboard cover).
3) Select <SH-PS-ST> to highlight, and press the OK key.
4) The machine executes automatic adjustment (about 10 sec).
5) When done, the machine stops automatically indicating the result (OK/
• If 'NG' is indicated, perform the following, and execute the mode once
again:
a. Is the ADF (copyboard cover) open?
b. Is the copyboard glass mounted correctly?
c. Is the standard white plate (attached to the copyboard glass) normal?
d. Does the scanning lamp go ON?
6) The items under COPIER>ADJUST>ADJ-XY and ADJ-S are updated.
S-76
• If dirt is found on the copyboard glass, execute this mode to avoid
the area when reading the standard white plate.
• You must execute the following if you have changed the setting:
COPIER>FUNCTION>CCD>SH-PS-ST.
Vertical
size plate
Standard white plate
Higher setting
• You must execute COPIER>FUNCTION>CCD>CCD-ADJ before
executing this move.
• Execute this mode if you have replaced the copyboard glass (stan-
dard white plate) or a white line is noted in halftone areas.
NG).
Record the new settings on the service label.
COPYRIGHT© 2001 CANON INC.
Shading
position
Copyboard glass
Lower setting
F00-204-05
2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001