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Theory of Operation Ver1.0 Sep.2006
13.3 Operation
13.3.1
Toner conveyance control
A. Toner supply control to the toner hopper
•
When toner level in the toner hopper becomes about 50g, the bottle motor (M53) and the toner bottle
clutch /Y (MC14), /M (MC15), /C (MC16) and /K (M52) are turned on. Then the toner bottle rotates to supply
new toner.
B. Toner supply control to the developing unit
(1) When the power is turned on
•
Each of the TCR sensors /Y (TCRS/Y), /M (TCRS/M), /C (TCRS/C) and /K (TCRS/K) detects the toner den-
sity in each developing unit after the specified time passed from when the sub power switch (SW2) turns
on.
•
When the detected density is below the reference toner density that is stored in the CPU on the printer con-
trol board (PRCB), the toner supply motors /Y (M49), /M (M50), /C (M51) and /K (M52) are turned on to
supply toner up to the specified density.
(2) While in printing
•
While in the print operation, each of the TCRS /Y, /M, /C and /K monitors the toner density.
•
When output voltage of the TCRS /Y, /M, /C and /K is below the reference value, the toner supply motors
are turned on to supply toner up to the specified density.
13.3.2
Remaining toner detection control
A. Remaining toner detection control
•
Toner levels in each toner hopper are detected by the piezoelectric sensors /Y (PZS/Y), /M (PZS/M), /C
(PZS/C) and /K (PZS/K).
B. Detection timing
•
During printing (always on)
C. No-toner display on the operation panel
•
When the value output from the piezoelectric sensor still indicates the "no-toner" status even after the toner
is supplied to the toner hopper, it is judged that the toner bottle has run out of toner and the message
"Please replace toner bottle" is displayed on the touch panel.
13.3.3
Stop control for print operation with no toner
•
After the message "Please replace toner bottle" is displayed on the touch panel, the consumption of the
remaining toner (about 50g) in the toner hopper is detected by the driving time of the toner supply motors /
Y (M49), /M (M50), /C (M51) and /K (M52).
•
When it is detected that the remaining toner has been consumed, the print operation is stopped by the set-
tings of DIPSW1-2 and 1-3.
•
When toner density in the developing unit becomes below the reference value while in the printing stop
operation described above, print operation is immediately stopped after exiting the paper in progress.
13. TONER SUPPLY SECTION
61
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