Error Code (E020) Related To Control Of Toner Concentration - Canon CLC 1120 Service Manual

CHAPTER 6 IMAGE FORMATION SYSTEM

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)
6-40
COPYRIGHT © 1999 CANON INC.
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.
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Detail code
00FF Hopper motor error
01FF The M hopper is not
supplying toner.
02FF The C hopper is not supplying
toner.
03FF The Y hopper is not supplying
toner.
04FF The Bk hopper is not
supplying toner.
Items of detection