Panasonic KX-MB763RU (serv.man13) Service Manual ▷ View online
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KX-MB763RU
6.12.6. TOP COVER SENSOR
The Switches detect whether the top cover is open or closed.
When the top cover is closed, the switches turn ON, and the input signal of IC300-W25pin becomes a low level.
When the top cover is open, the switches turns OFF, and the input signal of IC300-W25pin becomes a high level.
When the top cover is closed, the switches turn ON, and the input signal of IC300-W25pin becomes a low level.
When the top cover is open, the switches turns OFF, and the input signal of IC300-W25pin becomes a high level.
Switch
Signal (IC300-W25pin)
Open
OFF
High level
Close
ON
Low level
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KX-MB763RU
6.12.7. 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, Hall IC (IC50) turns off, and the input signal of IC300-AE22pin (Main Board) becomes a High level
over 9s. When the Drum unit is set, Hall IC (IC50) turns ON/OFF. If the time of IC300-AE22pin's Low level is under 600ms, there
is enough toner in Drum unit, if not, toner is near empty.
When there is not Drum unit, Hall IC (IC50) turns off, and the input signal of IC300-AE22pin (Main Board) becomes a High level
over 9s. When the Drum unit is set, Hall IC (IC50) turns ON/OFF. If the time of IC300-AE22pin's Low level is under 600ms, there
is enough toner in Drum 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 Hall IC 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 Hall 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>1s
Mixing Paddle does not rotate
(“CHANGE DRUM”)
(“CHANGE DRUM”)
CHANGE DRUM
High level fix or Low level fix
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KX-MB763RU
6.12.7.1. 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 3.3 sec-
onds.
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KX-MB763RU
6.12.7.2. Drum Detection
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