2. Detecting the Level of Toner and Controlling
the Supply
The toner inside the developing assembly is
checked by the black toner sensor (Q85) at inter-
vals of 1 sec; the sensor sends the black toner
supply signal BTS=0 to the DC controller when
the level of toner inside the developing assembly
falls below a specific level while the developing
clutch (CL1) is on during copying operation.
The DC controller PCB generates the hopper
motor drive signal (
) to drive M18, thereby
supplying toner to the developing assembly.
If the black toner sensor (Q85) becomes faulty
for some reason or if the black toner supply signal
BTS=0 is detected for 120 sec or more without a
required amount of toner from the hopper, the
copier will indicate ‘E020’ and stop its operation.
HMD
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-69
Black toner supply
signal (BTS)
Hopper toner level
detection signal (TEP)
INTR
SCFW
SCRV
SCFW
SCRV
LSTR
STBY
*1
*2
Add Toner indicator ON
Add Toner indicator OFF
*1 Supply starts upon detection of black toner supply signal=0.
*2 Supply stops upon detection of black toner supply signal=1.
Copy Start key ON
Hopper motor (M18)
Toner supply
Figure 3-324
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