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2.
Detection
of Black Toner
The amount
of toner inside the developing
assembly
is monitored
by the toner
level sensor
(al);
and the message
ADD TONER will be displayed
on the control
panel when
the toner
falls below
the
'-\
>
specified
amount.
,,
a.
ADD TONER Message
The message
is displayed
if the toner
out signal
(TEP) is present
two
seconds
or more while
in
stand-by
and the condition
repeats
four times in a row for each stand-by.
The count
will be cleared,
however,
if the power
is turned
OFF or TEP = 0 does not last for two
seconds
for each stand-by.
When
the ADD TONER message
flashes,
input from the keys on the control
panel will not be ac-
cepted;
turn the power
OFF and ON again to reset the condition.
Note:
The toner
sensor
uses a piezoelectric
oscillator,
which
oscillates
at several
kHz in the absence
of toner,
causing
the sensor
output
to go '0'. In the presence
of toner,
the weight
of the toner
stops the oscillation
of the piezoelectric
oscillator,
and the
sensor
output
goes
'I'.
Figure 3-29
Figure 3-30
TEP = 0 Lasts Two Seconds
or More
During STBV
Four Times
in Succession
I
'TEP
=
'0,. 2 set or less.
Figure 3-31
TEP = 0 Lasted
During STBY
Less Than Two Seconds
COPVRIGHT
019GO CANON INC.
CANON HP-1010 REV.0 DEC. 1988 PAINTED IN JAPAN IIMPAIME AU JAPOM
3-23
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