Canon imageRUNNER ADVANCE C2030 Service Manual page 84

2
Process/Operation > Image Formation System > Controls > Drum Unit (Developing/Drum)
● Drum Unit Life Detection
Life of the Drum Unit (Photosensitive Drum) is detected.
Detection timing
• At power-on
• At every print
• At recovery from sleep mode
Detection description
1) Count value for the Drum life is calculated by rotation time of the Photosensitive
Drum + time that the primary charging AC bias is applied as well as the time that the
developing AC bias is applied.
2) The count value calculated in step 1) is added to the Drum count value that has been
stored in the memory tag of the Drum Unit.
NOTE:
The life (displayed in %) can be checked by the following service mode:
COPIER > COUNTER > LF > X-DRM-LF
(Enter Y/M/C/K for X above)
2 Process/Operation > Image Formation System > Controls > Drum Unit (Developing/Drum)
● Drum Phase Control
Overview
There can be uneven rotation speed of the Drum because the shapes of the Drive Gears
(that rotate the Drum) slightly differ with each other. This control adjusts relative position of
the Drum Drive Gears between YMC and Bk as well as controls uneven rotation between the
YMK Motors and the Bk Motor to avoid color displacement.
Drum Phase Detection
Using the Drum HP Sensor, this is to detect absolute positional relation of the Y, M, C and
Bk Drum Drive Gears by detection of the slit equipped with the Drum Drive Gear of the Host
Machine. There are 2 detection positions for Drum phase: 1 position for Y, M and C and 1
position for Bk.
The following shows an outline drawing of the unit relating to phase detection.
Drum HP sensor
HP Flag 2
Drum Drive Gear
There are ribs with the Drum Drive Gear, which also have 2 slits of the HP Flags facing each
other (opposed by 180 degree): HP Flag 1 (4mm width) and HP Flag 2 (2mm width). The
Drum phase detection area determines which HP Flag (the flag at slit 1 or the flag at slit 2)
has passed by the time when the slit passes through the Drum HP Sensor. Because the
phase has been aligned at the time of assembly, even just the 2 slits can make the phase
aligned with high accuracy.
2-50
HP Flag 1
Drum Motor
F-2-70
2-50