Panasonic KX-FL423RU Service Manual ▷ View online
45
KX-FL423RU-B / KX-FL423RU-W
6.12.7. Paper Exit Sensor..... "PAPER JAMMED"
The sensor detects whether the recording paper exit out or not.
When there is no recording paper at the position of the sensor, the shelter plate closes the sensor light, the photo-transistor fot tarus
OFF, and the input signal of IC101-C8pin becomes high level.
When the recording paper reach the exit sensor, the shelter plate let the sensor light passing through, the photo-transistor ON, and
the input signal of IC101-C8pin becomes a low level.
[Exit Sensor]
When there is no recording paper at the position of the sensor, the shelter plate closes the sensor light, the photo-transistor fot tarus
OFF, and the input signal of IC101-C8pin becomes high level.
When the recording paper reach the exit sensor, the shelter plate let the sensor light passing through, the photo-transistor ON, and
the input signal of IC101-C8pin becomes a low level.
[Exit Sensor]
Photo-transistor
Signal (IC101-C8 pin)
No Paper
OFF
High level
Paper Exist
ON
Low level
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KX-FL423RU-B / KX-FL423RU-W
6.12.8. Toner Sensor.... "TONER EMPTY", "TONER LOW", "CHANGE DRUM"
The Sensor detects whether or not the Drum unit and the toner are present.
When there is not Drum unit, Magnetic Field Sensor IC (IC512) turns off, and the input signal of IC101-A11 pin (Digital P.C.B)
becomes a High level over 9s. When the Developer unit is set, Magnetic Field Sensor IC (IC512) turns ON/OFF. If the time of
IC101-A11 pin's Low level is under 600ms, there is enough toner in Developer unit, if not, toner is near empty.
When there is not Drum unit, Magnetic Field Sensor IC (IC512) turns off, and the input signal of IC101-A11 pin (Digital P.C.B)
becomes a High level over 9s. When the Developer unit is set, Magnetic Field Sensor IC (IC512) turns ON/OFF. If the time of
IC101-A11 pin's Low level is under 600ms, there is enough toner in Developer unit, 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 steel becomes short when toner is left and long with no toner.
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 steel becomes short when toner is left and long with no toner.
State
Display
Signal (IC101-A11pin)
Toner Set (full)
-
Low level = about 0.5s
Near Empty Toner
TONER LOW
Low level>1.0s
Mixing Paddle does not rotate
(“CHANGE DRUM”)
(“CHANGE DRUM”)
CHANGE DRUM
High level fix or Low level fix
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KX-FL423RU-B / KX-FL423RU-W
6.12.8.1. Toner Detection Flow
CAUTION:
1. Toner low can be judged by continuous 5-times TONER LOW signal at only printing.
(It is not executed at.)
2. Toner full can be judged by continuous 3-times TONER FULL signal at initialization.
(It is not executed at printing.)
3. In the ordinal operation, “CHECK DRUM” is displayed when TONER EMPTY sensor does not generate a signal for 3.1 sec-
onds.
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KX-FL423RU-B / KX-FL423RU-W
6.12.8.2. Drum Detection Flow
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