Canon Color imageRUNNER C4580, Service Manual

Page: 255 / 851

Chapter 9
9-14
9.3.5 After Replacing the Drum Unit (D-UNIT)
When a new drum unit (D-UNIT) has been installed,
Characteristics
- when a drum unit is fitted and the machine's front cover is closed, the developing cylinder starts to rotate.*1
- so that the developing cylinder may be coated evenly with developer, the cylinder is rotated for 30 sec at the
beginning
*1Whether it is a new drum unit is judged by the accumulated print number of memory tag in the drum unit. If
not a new D-UNIT is set, this sequence is not executed.
- if the drum unit is not new, this sequence is not executed; the sequence used at power-on (1) or (2) is executed
- about 150 sec after the drum unit has been fitted, image stabilization control is executed in the following order
discharge current level control
ATVC control
ATR control
SALT-Dmax control
image position correctionSALT-Dhalf control
F-9-10
CNTR WMUPR PSTBY
1
1 : iR C5180 iR C4580/2880 (230V): 0sec
2 : iR C5180.
Drum/ITB
motor (M1)
Exposure (Y)
Charging (DC)
bias (Y)
Development
motor (Y)
Developing (DC)
bias (Y)
Developing (AC)
bias (Y)
Upstream auxiliary (DC)
bias (Y)
Upstream auxiliary (AC)
bias (Y)
Downstream auxiliary (DC)
bias (Y)
Primary transfer
bias (Y)
Secondary
transfer bias
Charging (AC)
bias (Y)
New drum unit fitted,
and front cover closed
Cleaning by second-
ary transfer roller
Scraping off toner
by auxiliary brush
Scraping off toner
by auxiliary brush
Image stabilization
control (for details, see
appropriate sections)
Approx. 10sec Approx. 120sec Approx. 120sec
Approx. 30sec
Y Drum Unit Initialization Sequence