Canon NP6412 Service Manual page 475

CHAPTER 2 STANDARDS AND ADJUSTMENTS
6) Change the setting using the +/- key until gray scale No. 9 is barely visible by way of adjusting
the intensity of the scanning lamp.
• The setting may be between 0 and 99.
• For each '1', the lamp supply voltage will change about 0.15 V (for 120V model) or about
0.30 V (for 220/240V model).
• A higher setting will decrease the intensity of the lamp, thereby making copies darker.
• A lower setting will increase the intensity of the lamp, thereby making copies lighter.
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