58
UF-5500 / 4500
6.12.9. Toner Sensor.... “Out of Toner”, “Toner Low”, “Replace Drum”
The Sensor detects whether or not the Drum cartridge and the toner are present.
When there is not Drum cartridge, Magnetic Field Sensor IC (IC51) turns off, and the input signal of IC300-AE22pin (Main
Board) becomes a High level over 9s. When the Drum cartridge is set, Magnetic Field Sensor IC (IC51) turns ON/OFF. If the
time of IC300-AE22pin's Low level is under 600ms, there is enough toner in Drum cartridge, if not, toner is near empty.
Toner Sensor
The rest of toner is detected by the move speed of the magnet put on the pendulum of Mixing Paddle. The pendulum is pushed
up by the Mixing Paddle, then it falls down by its own weight. The rotation speed of paddle is set slower than the one of pendu-
lum which falls down by its own weight. When the toner is still left, the pendulum falls and stops on the toner, then pushed by the
paddle, it starts to rotate. When no toner is left, the pendulum falls to the bottom. Consequently the contact time between the
magnet and Magnetic Field sensor IC becomes short when toner is left and long with no toner.
State
Display
Signal (IC300-AE22pin)
Toner Set (full)
-
level = about 0.3s
Near Empty Toner
TONER LOW
Low level>540ms
Mixing Paddle does not rotate
(“REPLACE DRUM”)
REPLACE DRUM
High level fix or Low level fix
8
Output
Toner Board
Main Board
IC51
Sensor
(Magnetic Field
Sensor IC)
CN64
CN508
8
R527
+3.3V
R523
+3.3V
C516
AE22
IC300
3
1.Toner Full
2. Toner Low
3. In case the Mixing Paddle does not rotate
Pendulum
Turning free
Mixing Paddle
Constant revolution
Toner
Magnetic Field
Sensor IC
Magnet
Sensor
Sensor Signal
ON (0V)
OFF (3.3V)
0.3sec
2.4 sec
>540msec
ON (0V)
OFF (3.3V)
ON (0V)
OFF (3.3V)
2.4 sec
Toner Board
ON (0V)
OFF (3.3V)
3.1
3.2
Magnetic Field
Sensor IC
Magnetic Field
Sensor IC
Summary of Contents for UF-4500
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