Cleaning The Primary Charging Wire; Outline; Operation Of The Primary Charging Wire Cleaning Wire - Canon NP6045 Service Manual

G. Cleaning the Primary Charging Wire

1. Outline

The copier is equipped with an automatic cleaning mechanism for cleaning the
charging wire of the primary charging assembly, and cleaning is executed when the
following conditions are met:
• The temperature of the fixing roller is 100°C or less at power-on.
• Charging wire cleaning is executed in user mode. (p. 1-16)
• Last rotation (LSTR) has ended after making about 2000 copies.
If cleaning has been executed under the above two conditions, cleaning is executed
after making 2000 copies thereafter.

2. Operation of the Primary Charging Wire Cleaning Wire

When the power switch is ON and the surface temperature of the fixing roller is
100°C or less, the primary charging wire cleaning motor (M12) rotates clockwise to move
the cleaner forward for about 20 sec. The drive motor rotates counterclockwise to move
the cleaner in reverse for about 16 sec. (The copier is not equipped with a cleaner
position detection mechanism.)
The RAM on the DC controller PCB keeps count of how many times the charging
wire has been cleaned. Cleaning is executed each time 2000 copies have been made;
in the case of continuous copying, cleaning is executed when as many copies as
specified have been made.
Primary charging assembly
DC controller PCB
COPYRIGHT © 1997 CANON INC.
Feeding screw
Wire
Wire cleaner
(PCLM)Primary charging wire cleaning motor drive signal
J103B-3, 4
Figure 4-121
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Primary charging wire cleaning motor (M12)
4-23