Figure 10-209Caution:After the adjustments (both a and b), turn on and off the power switch or changethe reproduction ratio so that the blank exposure assembly performs homepositioning.6. Adjusting the Scanning Lamp IntensityTurn VR301 on the DC controller as follows whenever you have replaced thescanning 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).k 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 togray 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 itclockwise until it stops, and turn off and then on the power for re-adjustment.Caution:Be sure to execute AE adjustment after these adjustments.10-10CHAPTER 10 TROUBLESHOOTINGCOPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)ShutterThe entire shutters areshifted.
