Canon NP6412 Service Manual page 476

CHAPTER 2 STANDARDS AND ADJUSTMENTS
3. AE Adjustment
Perform this adjustment if you have replaced any of the following:
• DC controller PCB
• Composite power supply PCB (See p.2-37)
• AE sensor PCB
• Scanning lamp
Making Adjustments
Preparatory Work
• Obtain a newspaper which is more or less even in density. (Avoid ones with photos or large
text characters.)
• Obtain five sheets of white sheets of paper
• Make sure that the intensity of the scanning lamp has been adjusted when you have replaced
the scanning lamp.
• Set the density correction dial (VR107) to the middle setting.
1) Select '40' in service mode.
• The display will indicate '40'.
2) Press the Copy Start key.
• The scanner will move forward, and the scanning lamp will turn on.
3) Turn VR103 on the DC controller PCB fully clockwise.
2-40
VR103
AE GAIN
J130
AE
VR102
REF
J103
J104
Figure 2-62