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-3.
OPERATIONS AND TlMlNG
G. Developing Assembly/ Drum
Cleaner
1.
Outlines
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
assembly
is sen$ed by the black toner level
sensor (TSl).
When the amount
of toner falls below
the required
quantity,
the ADD
TONER
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
assembly
is pressed
against
the drum by a cam that presses
against the developing
assembly
rail. (The
cam
is
operated
by
the
developing
assembly
release lever.)
2.
Remaining
Toner Sensor
The black developing
assembly
has a
piezoelectric
type
sensor
(TSl)
which
senses if the toner remaining
in the hopper
of the developing
assembly
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 makes checks for 30
seconds
during
copying,
if the TONER
EMPTY signal (BTEP) is being outputted.
,If
the, signal is outputted
continuously
for 30
seconds, it is regarded as TONER OUT and
the DC controller
makes the ADD TONER
indicator flash.
The CT unit for this copier
does not
have
a toner
remaining
sensor
or waste
toner sensor.
3.
Torque
Limiter
There
is a torque
limiter
in the drive
train between the main motor and the drum
--
to stop the drum in response to a jam in the
drum cleaner.
Figure 3-29
3 - 30
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1903CUiQNNC
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