Panasonic DP-MB545 / DP-MB537 / DP-MB536 / DA-FAP109 / DA-FAP110 Service Manual ▷ View online
109
DP-MB545/537/536 series
6.21. Power Supply Board Section
The power supply board circuit generates 24Vdc and 7Vdc at normal mode.
It also supplies AC voltage to the two halogen heat lamps in the fuser unit.
The power supply board has two converter circuit, and it uses the switching regulator method, also it has a power save function.
It also supplies AC voltage to the two halogen heat lamps in the fuser unit.
The power supply board has two converter circuit, and it uses the switching regulator method, also 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]
<24V Converter>
The input circuit is rectified by RC1 and charge C201/C202 make DC voltage. Then it supplies power to the converter circuit.
<7V Converter>
The input circuit is rectified by RC401 and charge C401 to make DC voltage. Then it supplies power to the converter circuits.
The input circuit is rectified by RC1 and charge C201/C202 make DC voltage. Then it supplies power to the converter circuit.
<7V Converter>
The input circuit is rectified by RC401 and charge C401 to make DC voltage. Then it supplies power to the converter circuits.
[Kick-on Voltage Circuit]
<24V Converter>
Bias is applied to the Q201 gate via this circuit when the AC power is turned on and Q201 begins operating.
<7V Converter>
Bias is applied to the Q401 gate via this circuit when the AC power is turned on and Q401 begins operating.
Bias is applied to the Q201 gate via this circuit when the AC power is turned on and Q201 begins operating.
<7V Converter>
Bias is applied to the Q401 gate via this circuit when the AC power is turned on and Q401 begins operating.
[Control Circuit and Error Detecting Circuit]
The control circuit detects the voltage that increased in an error detect circuit and controls it to become the predetermined out-
put voltage.
This is shown as follows.
<24V Converter>
When the output voltage of the 24V circuit increases, the current of the photo coupler PH201 increases, the pulse width of the
output control IC201 becomes narrower and the ON period of Q201 becomes shorter.
<7V Converter>
When the output voltage of the 7V circuit increases, the current of the photo coupler PH401 increases, the pulse width of the
output control IC401 becomes narrower and the ON period of Q401 becomes shorter.
put voltage.
This is shown as follows.
<24V Converter>
When the output voltage of the 24V circuit increases, the current of the photo coupler PH201 increases, the pulse width of the
output control IC201 becomes narrower and the ON period of Q201 becomes shorter.
<7V Converter>
When the output voltage of the 7V circuit increases, the current of the photo coupler PH401 increases, the pulse width of the
output control IC401 becomes narrower and the ON period of Q401 becomes shorter.
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DP-MB545/537/536 series
[Power Saving Function]
Output voltage is changed by PWRDWN signal.
[Over Current Protection (O.C.P)]
<24V Converter>
The highest drain current of Q201 is limited by a over current circuit. The 24V output is limited by this circuit.
<7V Converter>
The highest drain current of Q401 is limited by a over current circuit. The 7V output is limited by this circuit.
The highest drain current of Q201 is limited by a over current circuit. The 24V output is limited by this circuit.
<7V Converter>
The highest drain current of Q401 is limited by a over current circuit. The 7V output is limited by this circuit.
[Over Voltage Protection (O.V.P)]
If the 24V or 7V output increases because the error detecting circuit or control circuit is broken, output becomes 0V by control
IC’s function.
IC’s function.
[Zero Cross Output Circuit]
The circuit outputs 0V point of the AC power line.
Dummy load method (to quickly check the power supply output).
See the Low Voltage Power Supply Board (SMPS Board) Section.
Condition
PWRDWN
24Vout
7Vout
Normal
Open
21.6-26.4V
6.5-7.5V
Power Save
Low (0V)
10.0-15.0V
6.5-7.0V
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DP-MB545/537/536 series
6.22. Mechanical Operation
6.22.1. Print Process
This Laser Printer creates an image on paper using a technique called laser electrophotography.
The printer uses the electrographic process known as Discharged Area Development, or “write black”.
In this process, a digitally modulated laser scans laterally 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.
The printer uses the electrographic process known as Discharged Area Development, or “write black”.
In this process, a digitally modulated laser scans laterally 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.
Lower
Input
Tray
Input
Tray
ADU Sensor
Pressure Roller
POUT Sensor
Toner Sensor
Heat Roller
LSU
OPC
ADU Feed Roller
Toner
Resist Roller
PTOP Sensor
Paper Width Sensor
Resist Sensor
Pick Sensor
Pick Up Roller
Paper Sensor
Separation Roller
Feed Roller
MPT Feed Roller
MPT Pick Sensor
MPT Pick Up Roller
MPT Paper Sensor
MPT Separation Roller
Exit/Switchback Roller
Pick Sensor
Pick Up Roller
Paper Sensor
Separation Roller
Feed Roller
Pick Sensor
Pick Up Roller
Paper Sensor
Separation Roller
Transfer Roller
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DP-MB545/537/536 series
6.22.2. Scanning (FB)
The CIS scans the document on the Flatbet glass. The CIS Assy is driven by the FB Motor and the Timing belt.
6.22.3. Scanning (ADF)
This Auto Document Feeder (ADF) can read double side documents as well as single side documents.
ADF motor supplies all power to rotate the rollers.
Switchback solenoid is provided to change the rotation direction of Exit Roller.
When switchback solenoid is OFF, Exit roller rotates toward the paper eject, and when ON, rotates reverse direction.
ADF motor supplies all power to rotate the rollers.
Switchback solenoid is provided to change the rotation direction of Exit Roller.
When switchback solenoid is OFF, Exit roller rotates toward the paper eject, and when ON, rotates reverse direction.
6.22.3.1. Single side Scanning
• DOCUMENT TRANSMISSION (ADF)
The frictional force between SEPARATION ROLLER (DOC.)and SEPARATION RUBBER makes PICK UP ROLLER (DOC.)
move downward from standby position to pick up paper.
Pick-upped paper is separated by SEPARATION ROLLER (DOC.) and SEPARATION RUBBER (DOC.), and then fed by FEED
ROLLER (DOC.).
After being read by CIS, the paper is ejected by ROLLER DOC EJECT.
Switchback path switching solenoid and switchback solenoid is always OFF.
move downward from standby position to pick up paper.
Pick-upped paper is separated by SEPARATION ROLLER (DOC.) and SEPARATION RUBBER (DOC.), and then fed by FEED
ROLLER (DOC.).
After being read by CIS, the paper is ejected by ROLLER DOC EJECT.
Switchback path switching solenoid and switchback solenoid is always OFF.
• DOCUMENT TRANSMISSION (SCANNER GLASS)
CIS Module is carried by the belt timing along the shaft carriage to the reading start position.
Then it goes back to the home position reading the document through the glass.
Then it goes back to the home position reading the document through the glass.
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