Canon NP6218, Service Handbook

Page: 12 / 94

Figure 2-9
Caution:
After the adjustments (both a and b), turn on and off the power switch or change
the reproduction ratio so that the blank exposure assembly performs home
positioning.
6. Adjusting the Scanning Lamp Intensity
Turn VR301 on the DC controller as follows whenever you have replaced the
scanning lamp, intensity sensor, or DC controller.
1) Set Test Sheet NA3 on the copyboard, and close the copyboard cover.
2) Adjust the copy density (AE off) to electrical central position (service mode 1/0 mode
[2] No. 212 Value = 153~159).
❋
Without this adjustment, exposure value becomes invalid.
3) Turn VR301 on the DC controller so that the image is optimum.
• If the image is too light, turn the VR slightly clockwise.
• If the image is too dark, turn the VR slightly counterclockwise.
Reference:
1. The term optimum image refers to a copy whose gray scale No. 8 corresponds to
gray scale No. 4 through 7 of the Test Sheet without fogging.
2. An excessive turn on the VR could put out the lamp. If that is the case, turn it
clockwise until it stops, and turn off and then on the power for re-adjustment.
Caution:
Be sure to execute AE adjustment after these adjustments.
CHAPTER 2 STANDARDS AND ADJUSTMENTS
2-6
Shutter
The entire shutters are
shifted.