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q When the Level of Toner Is Adequate
The presence of toner around the toner level sensor causes the AC bias generated
by the sensor to be larger than the reference signal.
The condition causes the output from the comparator circuit to go ‘1’ and the toner
out signal (TEP*) to go ‘0’.
w When the Level of toner Is Inadequate
The toner around the toner level sensor decreases in amount, causing the AC bias
generated by the sensor to lower.
Since the reference signal, on the other hand, remains unchanged, the output
voltage remains high.
The difference in the potential causes the output of the comparator circuit to go ‘0’,
causing the toner out signal (TEP*) to go ‘1’.
The condition causes the microprocessor (Q301) in the DC controller cirucit to make
checks only during copying operating (AC bias ON); if it detects the toner out signal=0,
each lasting 0.25 sec or more, for a total time equivalent of three copies, the Cartridge
indicator is flashed on the display of the control panel.
e Torque Limiter
If an excessive load is imposed on the photosensitive drum because of excessive
amounts of waste toner or some other reason while the drum is rotating, the torque
limiter cuts off the drive from the main motor to stop the rotating of the drum.
Figure 4-203
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
4-24
STBY
Copy Start key
ON
Main motor (M1)
Toner level detection timing
Toner out signal (TEP*)
AC bias
Power switch
ON
Cartridge indicator
flashing timing
A4, AE3 copies, continuous mode
Cartridge indicator (tlashing)
1st (3 sec)
2nd (1 sec)
3rd (0.5 sec)
Copy STBY Copy STBY Copy