COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-169
3. OPERATION AND TIMING
7. Operation of the Transfer Belt Lifter
A mechanism is needed to prevent adhesion of toner on the photosensitive drum to the transfer belt
when the density of Bk toner is measured (See chapter 3. E. Developing Assembly, 4-e. Measuring the
Toner by the SALT Sensor). To prevent adhesion, the drive of the pick-up motor (M10) is transmitted to the
cam through the transfer belt lifter clutch (CL17), thereby lowering (moving away) the transfer belt by the
transfer lifter arm.
When the density of Bk toner has been measured, the transfer belt is moved up back to the point of
transfer.
The lifter movement is monitored with reference to the light-blocking plate (mounted to the cam shaft)
detected by the transfer belt lifter sensor 1 (PS12) and the transfer belt lifter sensor 2 (PS13). (See Table 3-
610.)
If the transfer belt lifter does not reach a specific point over a specific period of time after the transfer belt
lifter clutch has turned on, ‘E074’ will be indicated on the control panel.
Figure 3-638
Photosensitive
drum (Bk)
Photosensitive
drum (C)
Photosensitive
drum (M)
Photosensitive
drum (Y)
Drive roller
Transfer belt
lifter clutch
Transfer lifter arm
Transfer belt
PS12
PS13
CL17
M10
Arm fulcrum
Lifter fulcrum
Light-blocking
plate
Cam
Transfer belt
lifter sensor 1
(PS12)
Transfer belt
lifter sensor 2
(PS13)
Pick-up motor
Cam shaft
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