Panasonic KX-MB1500UCW / KX-MB1520UCB Service Manual ▷ View online
53
KX-MB1500UCW/KX-MB1520UCB
6.12.3. Exit sensor
This sensor detects whether a 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.
6.12.4. Interlock switch
The switches detect whether the front cover is open or close.
When the front cover is close, the both switches turn ON, and the input signal of IC300-W25pin becomes Low level.
When the front cover is open, the both switches turn OFF, and the input signal of IC300-W25pin becomes High level.
When the front cover is close, the both switches turn ON, and the input signal of IC300-W25pin becomes Low level.
When the front cover is open, the both switches turn OFF, and the input signal of IC300-W25pin becomes High level.
Signal (IC300-AD20pin)
A paper exists
High level
No papers
Low level
Switch
Signal (IC300-W25pin)
Open
OFF
High level
Close
ON
Low level
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KX-MB1500UCW/KX-MB1520UCB
6.12.5. Toner Sensor
This sensor detects whether toner is present.
If the time of IC300-AE22pin's Low level is under 0.4s, there is enough toner in Drum cartridge, if not, toner is near empty.
If the time of IC300-AE22pin's Low level is under 0.4s, 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-AE22)
Toner full
-
Low level<0.4s
Near Empty Toner
TONER LOW
Low level>0.4s
Mixing Paddle does not rotate
CHANGE DRUM
High or Low level fix>2.7s (=2 rotations)
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KX-MB1500UCW/KX-MB1520UCB
6.12.6. Drum Life sensor circuit
1. General
This circuit detects whether the drum cartridge is brand-new or secondhand.
And if Drum cartridge is detected as brand-new, after predetermined printing, Fuse, which is installed inside of the Drum car-
tridge is cut.
After cutting the fuse, the Drum cartridge is judged as secondhand, and Drum life counting starts.
This circuit consists of Fuse cut block and Drum type detection block.
And if Drum cartridge is detected as brand-new, after predetermined printing, Fuse, which is installed inside of the Drum car-
tridge is cut.
After cutting the fuse, the Drum cartridge is judged as secondhand, and Drum life counting starts.
This circuit consists of Fuse cut block and Drum type detection block.
2. Circuit diagram
3. Circuit Explanation of Fuse cut block
When IC300_pinT24 is "H", both Q600 and Q602 are turned on. Then current flows F99 through R600/R601. Consequently
Fuse is cut within 1 second.
R600/R601 is supplied to restrict the fuse cut current to protect Q600.
Fuse is cut within 1 second.
R600/R601 is supplied to restrict the fuse cut current to protect Q600.
4. Circuit Explanation of Drum type detection block
This block detects whether Drum cartridge is brand-new or secondhand.
And also detect if the contact of the terminal is normal or not (contact error).
(1) In case of Brand-new Drum
Since Fuse is not open, resistance between the fuse is approx. 4 ohm.
So the voltage level of point A in the above circuit diagram is less than 1V.
As the result, both Q604 and Q605 and Q636 are turned on.
(2) In case of secondhand Drum
Since Fuse is open, resistance between the fuse is determined by the resistance of R99 (220ohm).
Since the resistance of R664 is 10Kohm, the voltage level of point A in the above circuit diagram is approx.3.5V.
Consequently Q606 is turned on and Q604 is turned off.
(3) In case of contact error of the terminal
Since both F99 and R99 are open condition, resistance between the fuse is infinite.
So the voltage level of point A in the above circuit diagram is approx. 5V.
Then both Q604 and Q605 are turned off.
According to the above transistor condition, the logic level of IC300_pinV24 and V25 are changed as below table.
Thus by checking these 2 signal levels, drum cartridge condition can be detected.
And also detect if the contact of the terminal is normal or not (contact error).
(1) In case of Brand-new Drum
Since Fuse is not open, resistance between the fuse is approx. 4 ohm.
So the voltage level of point A in the above circuit diagram is less than 1V.
As the result, both Q604 and Q605 and Q636 are turned on.
(2) In case of secondhand Drum
Since Fuse is open, resistance between the fuse is determined by the resistance of R99 (220ohm).
Since the resistance of R664 is 10Kohm, the voltage level of point A in the above circuit diagram is approx.3.5V.
Consequently Q606 is turned on and Q604 is turned off.
(3) In case of contact error of the terminal
Since both F99 and R99 are open condition, resistance between the fuse is infinite.
So the voltage level of point A in the above circuit diagram is approx. 5V.
Then both Q604 and Q605 are turned off.
According to the above transistor condition, the logic level of IC300_pinV24 and V25 are changed as below table.
Thus by checking these 2 signal levels, drum cartridge condition can be detected.
OPC_CNTCT
(IC300_pinV24)
DRUM_LIFE
(IC300_pinV25)
DRUM status
L
L
contact error
H
L
Secondhand
L
H
(Not used)
H
H
Brand-new
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KX-MB1500UCW/KX-MB1520UCB
6.13. Operation Board Section
The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC1) on Operation board and IC300 on Main board.
The key matrix table is shown below.
(IC1) on Operation board and IC300 on Main board.
The key matrix table is shown below.
1. Key Matrix
a. Hard Scan
2. LED
• AUTO ANSWER LED ON/OFF port---XLED12 (IC1-15pin) (KX-MB1520 ONLY)
• FAX MODE LED ON/OFF port---XLED11 (IC1-16pin) (KX-MB1520 ONLY)
• COPY MODE LED ON/OFF port---XLED9 (IC1-6pin)
• SCAN MODE LED ON/OFF port---XLED10 (IC1-9pin)
• FAX MODE LED ON/OFF port---XLED11 (IC1-16pin) (KX-MB1520 ONLY)
• COPY MODE LED ON/OFF port---XLED9 (IC1-6pin)
• SCAN MODE LED ON/OFF port---XLED10 (IC1-9pin)
KIN0
KIN1
KIN2
KIN3
KIN4
KIN5
KIN6
KIN7
KSL0 2
1
MENU
3
↑
AUTO
ANSWER (KX-
MB1520 ONLY)
ANSWER (KX-
MB1520 ONLY)
QUALITY
LAYOUT
KSL1 5
4
←
6
SET
KSL2 8
7
↓
9
START
KSL3 0
STOP
#
→
SP-PHONE
(KX-MB1520
ONLY)
(KX-MB1520
ONLY)
MUTE (KX-
MB1520 ONLY)
MB1520 ONLY)
KSL4
MODE
SIZE
ZOOM
CN2
CN511
IC300
ASIC
LCD MODULE
CN1
8x5
KEYS
MATRIX
(Hard)
KEYS
MATRIX
(Hard)
LED
MAIN BOARD
OPERATION BOARD
GATE ARRAY IC
IC1
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