Canon PC921 - Page 52

CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-38
2. Adjusting the Intensity of the Scanning Lamp
Adjust the intensity of the scanning lamp if you have replaced any of the following:
• DC controller PCB
• Composite power supply PCB (See p.2-37.)
• Scanning lamp
Caution:
If you have performed this adjustment, you must always perform AE adjustment.
Making Adjustments
1) Set a cartridge in the machine.
2) Set the density correction switch (SW101) to its middle index.
Figure 2-63
3) Turn off the AE mechanism, and set the copy density adjusting lever on the control panel to its
middle index.
4) Place the Test Sheet on the copyboard, and make a copy.
5) Turn VR107 on the DC controller PCB gradually until gray scale No. 9 is barely visible.
Figure 2-64
Table 2-7
VR107 and Copy Density
Direction of VR107
Clockwise
Counterclockwise
Copy density
Lighter
Darker
SW101
VR107
J102
J101
J107
J101J131
VR103VR102
J103
J130
J114
J104
J105
J109
J106
J102
VR104VR105VR106
VR107