Table of Contents
Advertisement
1. Outline
The paddle
inside the drum cleaning
unit and also the developing
cylinder are
rotated by the main motor.
The amount of toner in the developing
unit is sensed
by the toner sensor (06).
When the amount of toner falls below the
required quantity, the TONER OUT indicator
on the control panel will flash.
When the toner in the CT unit is used up,
the entire CT unit should be replaced.
The toner
collected
by the cleaning
blade is stored in the drum cleaning unit.
The developing
unit is pressed against
the drum by a cam that presses against the
developing
unit rail. (The cam is operated
by the developing
unit release lever.)
2. Remaining
toner sensor
The black developing
unit has a piezo-
electric type sensor (Q6) which senses if the
toner remaining in the hopper of the devel-
oping unit is above or below the required
level.
When the amount of toner in the hopper
is sufficient, the sensor output is "1". When
it is below the specified level, the output is
"0".
_
The DC controller checks for 5 seconds
after copying is completed
if 'the TONER
OUT signal is being outputted. If the signal
is outputted continuously for 5 seconds, it
is regarded
as "TONER OUT-First time". If
another TONER OUT signal is received in
the same way after the next copying opera-
tion is completed, it is regarded as "TONER
OUT-Second
time", and the DC controller
makes the TONER OUT indicator flash.
The CT unit for this copier does not have
a remaining
toner sensor or waste toner
sens,or.
3. Torque Limiter
There is a torque limiter in the drive train
between the main motor and the drum so
the drum can stop if it is jammed.
unit
Black
dewloping
unit
TONER
OUT
sienal
ITEP)
Figure 3-24
3 - 22
COPYlNGHT
0
IN00 CANON INC.
CANON NP4015/1215S
REV.0 OCT. 1988 PRINTElI
II APRN
IlMt'fIlMf
AU JAPOWI
Advertisement
Table of Contents
