Canon iR6000 Service Manual

COPYRIGHT © 2000 CANON INC. 2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
CHAPTER 4 IMAGE FORMATION SYSTEM
4-11 P
2.2 Determining Primary Current
To measure the dark area potential (VD) for the first time after the power switch is turned
on, the current used during previous measurement is let to flow, and the potential sensor is
used to measure the surface potential of the drum.
The DC controller PCB compares the surface potential of the drum against the target po-
tential; if the measured potential is ±6 V or higher than the target value, the primary current
is corrected, and the potential is measured once again. The potential is measured as many as
eight times, and the primary charging current is corrected as many as eight times.
F04--202-01
WMUPR
WMUP
STBY
200˚C
Potential sensor
Primary charging
Grid bias
Vpc Vpc Vpc Vpc
VD
+6V
-6V
VD
VD
Correction
control
sequence start
Potential
control
sequence start
Previous
potential
VDVD VD VD
VD
Target VD
Target
VD
Fixing assembly temperature 195˚C
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Canon iR6000 Specifications

General

Print Technology	Laser
Copy Resolution	600 x 600 dpi
Scan Resolution	600 x 600 dpi
Functions	Print, Copy, Scan
Print Speed	60 ppm
Duplex Printing	Yes
Network Connectivity	Ethernet
Paper Sizes	A3, A4, B4, B5
Warm-Up Time	30 seconds
Multiple Copies	Up to 999
Magnification	25-400%
Copy Speed	60 ppm (A4)