After Replacing The Drum Unit (D-Unit) - Canon imagerunner C5180 Service Manual

Chapter 9

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
New drum unit fitted,
and front cover closed
Approx. 30sec
1
Drum/ITB
motor (M1)
Exposure (Y)
Charging (DC)
bias (Y)
Charging (AC)
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
1 :
2 : iR C5180.
9-14
Y Drum Unit Initialization Sequence
WMUPR
Approx. 120sec
iR C5180 iR C4580/2880 (230V): 0sec
F-9-10
CNTR
Approx. 120sec
Approx. 10sec
Image stabilization
control (for details, see
appropriate sections)
Scraping off toner
by auxiliary brush
Scraping off toner
by auxiliary brush
Cleaning by second-
ary transfer roller
PSTBY