Canon PC920, Service Manual

Page: 114 / 393

CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-20
Figure 4-119
9) Repeat steps 5) through 8) so that the values of both VR102 and VR103 are target values.
Caution:
If you cannot set VR102 and VR103 to the target values at the same time, turn VR103 fully
counterclockwise, and go back to step 5) and make adjustments once again.
10) Make a copy, and check to make sure that it is free of fogging and the density of its characters
is good.
• If it is foggy or the characters are too light, go back to step 1) and start over.
• If no change is noted after re-adjustment, use the density correcting switch (SW101).
Figure 4-120
VR103
SW101
Lighter
Darker
7) Remove the newspaper from the copyboard; in its place, place five blank sheets of copy paper,
and close the copyboard cover.
8) Turn VR103 on the DC controller PCB so that the reading of the indicator is from ‘52’ to ‘5c’.