2. Idle Rotation of the Photosensitive Drum and the Developing CylinderIn a high humidity environment, the photosensitive drum and the developing cylindertend to absorb moisture, leading to a lowered copy density and distorted images (aswhen the machine is turned on for the first time in the morning).To prevent such a problem, if the surface temperature of the upper fixing roller is75°C or less, the photosensitive drum and the developing cylinder are rotated idly dur-ing the wait-up period.Idle rotation is controlled in ether of three modes according to the vapor ratio detect-ed by an environment sensor as shown in Table 4-107.Reference:The termvapor ratio refers to the amount of vapor (g) contained in 1 kg of air.The control modes shown in Table 4-107 may be adjusted in service mode.Table 4-107Reference:The 100V machines are shipped with the drum heater switch (SW3) set to ON (idlerotation mode ON).CHAPTER 4 IMAGE FORMATION SYSTEM4-24 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)Vapor ratio7 g/kg or less7 to 12 g/kg12 g/kg or moreRemarksNone2 to 2.5 minUp to 6 minIdle rotationNoneFixing roller 100°C through warm-upPower-on through fixing warm-up
