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30 November, 1999
Toner End Detection
The toner end sensor [A] below the toner tank detects toner near-end.
While the main motor rotates, the machine detects toner end by the voltage output
from the toner end sensor. The voltage from the sensor is close to 5V when the
toner tank is full and decreases when the toner is almost used up.
Toner Tank
Toner End
Sensor
Toner near-end condition: When the cpu detects a low output (below a certain
threshold) from the toner end sensor for a few seconds, the cpu starts to blink the
Add Toner indicator (LED). This is the toner near-end condition.
Toner end condition: After toner near-end is detected, the machine can print 100
more sheets, then the cpu disables printing (this is the toner end condition).
The machine clears the toner near-end or toner end condition when the power is
switched off and back on or when the cover is opened and closed, if the output
from the toner end sensor goes back high again.
NOTE: If the toner end sensor is accidentally disconnected, the machine cannot
detect if the cartridge is installed. The machine assumes that there is still
toner, even if the toner tank is empty.
+ 2 4 V
13-1
+ 5 V
13-2
2-9
PRINTING
[A]
H545D516.WMF
FCU
FCIP2
H545D507.WMF
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