Canon CLC 1120 Service Manual page 789

CHAPTER 13 TROUBLESHOOTING
Level 3
ADJ-S Use it to fine-adjust the position at which data is
(Note 1) collected for shading correction from the standard
white plate.
· Unit: number of steps from the stepping motor
· Scratches or dirt on the standard plate can cause
vertical white lines on copies. To correct the
problem, shift the point of measurement using this
item.
ADJ-J Use it to adjust the period of acceleration for the
(Note 1) original scanner motor.
Note: Execute this mode upon replacement of a PCB or initialization of the RAM. The settings will be
returned to standard settings, requiring you to enter the appropriate settings. Be sure to record
any new settings on the service label.
Adjusting the Image Read Start Position
Be sure to check the present point of attraction before starting the work.
1) Turn off the original detection mechanism before starting service mode.
2) Bring up the ADJ-XY screen, and press the Copy Start key.
· Appropriate copying mode will automatically be set, and a copy is made with a shift of
about 50 mm as shown.
3) If any part of the image is missing, decrease the setting of ADJ-X, ADJ-Y.
4) If an area outside the image is copied, increase the setting of ADJ-X, ADJ-Y.
13-262
COPYRIGHT © 1999 CANON INC.
Description
(front)
Point of measurement
Standard white plate
Figure 13-715
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Remarks
0 to 45
(0 to 4.8 mm)
Unit: about 0.107 mm
0 to +190
Unit: about 0.1 msec