CHAPTER 6 IMAGE FORMATION SYSTEM
6-40
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6. Error Code (E020) Related to Control of Toner Concentration
‘E020’ is used to indicate a fault associated with the concentration of toner. ATR control uses
different methods for Bk and M/C/Y, and the following two types of control are performed for
each:
1.
Controlling the concentration of toner to the initial setting at time of installation and
replacement of developer.
2.
Controlling the concentration of toner inside the developing assembly to a constant level
during copying sequence.
ATR is explained below in terms of ATR associated with the black toner concentration sensor
and the color (M/C/Y) toner concentration sensor and in terms of when ‘E020’ and its detailed code
are indicated.
a.
Flow of toner supply control in the hopper assembly and its related detail code
b.
Flow of initial setting control using the black toner concentration sensor and its related
detail code (at time of replacement of developer)
c.
Flow of initial setting control using the color toner concentration sensor and its related
detail code (at time of replacement of developer)
d.
Flow of control using the black toner concentration sensor at power-on and its related
detail code
e.
Flow of control using the black toner concentration sensor during copying operation and
its related detail code
f.
Flow of control using the color toner concentration sensor during copying operation and
its related detail code
a. Flow of Toner Supply Control in the Hopper Assembly and Its Related Detail
Code
Initial settings
1. During copying
operation
2. During copying
operation (during
toner supply)
Flow of operation
During copying operation,
the toner supply clutch is off.
During copying operation,
the toner supply clutch is on
and the hopper is supplying
the developing assembly
with toner.
Detail code
00FF
01FF
02FF
03FF
04FF
Items of detection
Hopper motor error
The M hopper is not
supplying toner.
The C hopper is not supplying
toner.
The Y hopper is not supplying
toner.
The Bk hopper is not
supplying toner.
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