Panasonic KX-MB2230RU / KX-MB2270RU / KX-MB2510RU / KX-MB2540RU Service Manual ▷ View online
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KX-MB2230RU/ KX-MB2270RU/ KX-MB2510RU/ KX-MB2540RU
6.18.3. 24V Power Supply Descriptions
1. The switch circuit which turns off a +24V power supply at the time of Sleep mode.
6.18.4. 2.5V Power Supply Descriptions
1. IC803 is low dropout three-terminal regulator for SPT.
6.18.5. Main Unit Power Supply Condition
* Low Voltage Power Supply board (SMPS Board) output
Condition
Ready/Copy
Power save
Sleep
Power Supply
P24V(*1)
24V
24V
12V-20V
+24VA
24V
24V
0V
+24VB
24V
24V
0V
LVIN(*2)
12V
12V
6.5V-7.5V
+5VD
5V
5V
5V
S5V
5V
5V
0V
+3.3V
3.3V
3.3V
3.3V
S3.3V
3.3V
3.3V
0V
2.5VT
2.5V
2.5V
2.5V
+1.2V
1.2V
1.2V
1.2V
C811
P24VA
S3.3V
Q806
+24VA
C833
P24VB
Q812
+24VB
S3.3V
C834
Q813
3
1
4
256
Q807
3
1
4
256
C815
R825
R821
R826
R822
C822
C832
+24V
+2.5VT
R843
+5VD
C836
R844
IC803
3
VIN
2
VOUT1
1
ADJ
4
VOUT2
R823
C835
+2.5V(SPT)
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KX-MB2230RU/ KX-MB2270RU/ KX-MB2510RU/ KX-MB2540RU
6.18.6. Main Unit Power Supply Sequence
6.18.7. Wave Form
[3.3V DCDC]
Ready Mode
Sleep Mode
[1.2V DCDC]
Ready Mode
Sleep Mode
[5V DCDC]
Ready Mode
Sleep Mode
12V
12V
7.5V
7.5V
7.5V
12V
12V
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KX-MB2230RU/ KX-MB2270RU/ KX-MB2510RU/ KX-MB2540RU
6.19. Power Supply Board Section
The power supply board circuit generates 24Vdc and 12Vdc at normal mode.
It also supplies AC voltage to the halogen heat lamp in the fuser unit.
The power supply board uses the switching regulator method, and it has a power save function.
It also supplies AC voltage to the halogen heat lamp in the fuser unit.
The power supply board uses the switching regulator method, and it has a power save function.
[Input Circuit]
The input current goes into the input rectifier circuit through the filter circuit.
The filter circuit decreases the noise voltage and the noise electric field strength.
The filter circuit decreases the noise voltage and the noise electric field strength.
[Rectifier Circuit]
The input circuit is rectified by D10 and charge C5 to make DC voltage.
Then it supplies power to the converter circuit.
Then it supplies power to the converter circuit.
[Kick-on Voltage Circuit]
Bias is applied to the Q1 gate via this circuit when the AC power is turned on and Q1 begins operating.
[Control Circuit and Error Detecting Circuit 1]
The control circuit detects the voltage that increased in an error detect circuit 1 and controls it to become the predetermined out-
put voltage.
This is shown as follows.
When the output voltage of the 24V circuit or 12V circuit increases, the current of the photo coupler PC1 increases, the pulse
width of the output control IC becomes narrower and the ON period of Q1 becomes shorter.
put voltage.
This is shown as follows.
When the output voltage of the 24V circuit or 12V circuit increases, the current of the photo coupler PC1 increases, the pulse
width of the output control IC becomes narrower and the ON period of Q1 becomes shorter.
[Power Saving Function]
Output voltage is changed by PWRDWN signal.
[Over Current Protection (O.C.P)]
The highest drain current of Q1 is limited by a over current circuit. The 24V or 12V output is limited by this circuit.
[Over Voltage Protection (O.V.P)/ Error Detecting Circuit 2]
If the 24V or 12V output increases because the error detecting circuit 1 or control circuit is broken, control circuit will recognize
this signal and output becomes 0V.
this signal and output becomes 0V.
Dummy load method (to quickly check the power supply output).
Refer to Low Voltage Power Supply Board (SMPS Board)Section (P.246).
Condition
PWRDWN
24Vout
12Vout
Normal
Open
24V
12V
Power Save
Low (0V)
12-20V
7V
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KX-MB2230RU/ KX-MB2270RU/ KX-MB2510RU/ KX-MB2540RU
6.20. Mechanical Operation
6.20.1. Print Process
This Laser Printer creates an image on paper using a technique called laser electrophotography. The printer uses the electro-
graphic process known as Discharged Area Development, or “write black”. In this process, a digitally modulated laser scans lat-
erally across a rotating OPC (Organic Photo Conductive) drum that has been positively charged. Wherever the OPC drum is
exposed by laser beam, the image is written and toner is transferred.
graphic process known as Discharged Area Development, or “write black”. In this process, a digitally modulated laser scans lat-
erally across a rotating OPC (Organic Photo Conductive) drum that has been positively charged. Wherever the OPC drum is
exposed by laser beam, the image is written and toner is transferred.
To generate a image, the OPC drum suitably rotate to the image length. During each successive pass, the laser exposes the
portions of OPC drum that correspond to component of the image. Toner is attracted to the laser-exposed portions of the OPC
drum.
The paper advances to the fuser, where heat and pressure permanently bond the toner to the paper. From the fuser, the paper
is driven to the output tray.
portions of OPC drum that correspond to component of the image. Toner is attracted to the laser-exposed portions of the OPC
drum.
The paper advances to the fuser, where heat and pressure permanently bond the toner to the paper. From the fuser, the paper
is driven to the output tray.
Exit Roller
Fuser Roller
Transfer Roller
OPC
Registration Roller
Pick Up Roller
Separation Roller
Feed Roller
ADU feed Roller
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