Panasonic KX-MB1900RUB / KX-MB1900RUW Service Manual ▷ View online
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KX-MB1900RUB/KX-MB1900RUW
6.10.3. Exit Sensor
This sensor detects whether the recording paper exits or not.
When there is a recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes low level.
When there is no recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes high level.
When there is a recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes low level.
When there is no recording paper at the position of the sensor, the input signal of IC300-AD20pin becomes high level.
6.10.4. Home Sensor
This sensor detects whether the carriage is at its home position or not.
When the carriage is at its home position, a shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC300-V23pin becomes high level.
When the carriage is not at its home position, a shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC300-V23pin becomes low level.
When the carriage is at its home position, a shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC300-V23pin becomes high level.
When the carriage is not at its home position, a shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC300-V23pin becomes low level.
Signal (IC300-AD20pin)
A paper exists
Low level
No papers
High level
Photo-transistor
Signal (IC300-V23pin)
A carriage is at home
OFF
High level
A carriage is not at home
ON
Low level
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KX-MB1900RUB/KX-MB1900RUW
6.10.5. Registration & Manual Paper Sensor
This sensor detects whether the recording paper is at the sensor position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-AF20pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-AF20pin becomes high level.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-AF20pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-AF20pin becomes high level.
6.10.6. Print Timing Sensor
This sensor detects whether the recording paper is at the printing position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-W26pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-W26pin becomes high level.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on, and input signal of IC300-W26pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off, and input signal of IC300-W26pin becomes high level.
Photo-transistor
Signal (IC300-AF20pin)
Paper exists
ON
Low level
No paper
OFF
High level
Photo-transistor
Signal (IC300-W26pin)
Paper exists
ON
Low level
No paper
OFF
High level
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KX-MB1900RUB/KX-MB1900RUW
6.10.7. 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-MB1900RUB/KX-MB1900RUW
6.10.8. Toner Sensor.... “Toner Empty”, “Toner Low”, “Change 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.
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.
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
(“CHANGE DRUM”)
(“CHANGE DRUM”)
CHANGE DRUM
High level fix or Low level fix
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