Idle Rotation Of The Photosensitive Drum And The Developing Cylinder - Canon NP6251 Service Manual

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CHAPTER 4 IMAGE FORMATION SYSTEM

2. Idle Rotation of the Photosensitive Drum and the Developing Cylinder

In a high humidity environment, the photosensitive drum and the developing cylinder

tend to absorb moisture, leading to a lowered copy density and distorted images (as

when 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 is

75°C or less, the photosensitive drum and the developing cylinder are rotated idly during

the wait-up period.

Idle rotation is controlled in ether of three modes according to the vapor ratio

detected by an environment sensor as shown in Table 4-107.

vapor 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.

7 g/kg or less

7 to 12 g/kg

12 g/kg or more

The 100V machines are shipped with the drum heater switch (SW3) set to ON (idle

rotation mode ON).

Idle rotation

Fixing roller 100°C through warm-up

Power-on through fixing warm-up

CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

2 to 2.5 min

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