Panasonic UF-490 / UF-4000 / UF-4100 Service Manual ▷ View online
93
4.4.6.
Horizontal Dark Lines
START
Is the printout in Service
Mode 3 normal?
Mode 3 normal?
Yes
No
Replace the Toner Cartridge.
1. Clean the BTR with a soft,
dry cloth.
dry cloth.
2. Replace the BTR.
No
Yes
Check the Scanner mechanism.
Is the Toner Cartridge
operational?
operational?
No
Yes
Is the Laser Unit (LSU) normal?
No
Yes
Replace the Laser Unit (LSU).
Is the Power Supply Unit
1. Check all connectors and
voltages on the Power
Supply Unit .
2. Check the Spring Connector
and voltage on the Power
Supply Unit.
voltages on the Power
Supply Unit .
2. Check the Spring Connector
and voltage on the Power
Supply Unit.
3. Replace the Power Supply
Unit.
Unit.
Yes
No
END
No
Yes
Clean or replace the rollers.
Paper Travel
P
Are there any foreign
particles or stains on the BTR?
particles or stains on the BTR?
Are the Fuser and Pressure
Roller surfaces clean?
Roller surfaces clean?
normal?
94
4.4.7.
Dark Background
Is the Laser Unit (LSU) normal?
No
Yes
Replace the Laser Unit (LSU).
START
No
Yes
Check the Scanner mechanism.
Is the Toner Cartridge/
Drum Unit Assembly
operational?
Drum Unit Assembly
operational?
No
Yes
Is the recording paper damp?
Yes
No
Replace the recording paper.
Replace the Toner Cartridge/
Drum Unit Assembly.
Drum Unit Assembly.
Is the Power Supply Unit
normal?
normal?
1. Check all connectors and
voltages on the Power Supply
Unit.
voltages on the Power Supply
Unit.
2. Check the Spring Connector
and voltages on the Power
Supply Unit.
and voltages on the Power
Supply Unit.
3. Replace the Power Supply Unit.
Yes
No
END
No
Yes
Clean or replace the rollers.
Paper Travel
P
Are the Fuser and Pressure
Roller surfaces clean?
Roller surfaces clean?
Is the printout in Service
Mode 3 normal?
Mode 3 normal?
95
4.4.8.
Light Print
END
No
Yes
START
No
Yes
Is the printout in Service
Mode 3 normal?
Mode 3 normal?
Check the Scanner mechanism.
Is the Toner Cartridge/
Drum Unit Assembly operational?
Drum Unit Assembly operational?
No
Yes
Is the recording paper damp?
Yes
No
Replace the paper.
Replace the Toner Cartridge/
Drum Unit Assembly.
Drum Unit Assembly.
Are there any foreign particles or
stains blocking the Laser Unit
path?
stains blocking the Laser Unit
path?
Yes
No
1. Remove the particles from the
laser beam path or clean the stains.
2. Replace the LSU.
laser beam path or clean the stains.
2. Replace the LSU.
Is the Power Supply Unit normal?
1. Check all connectors and
voltages on the Power Supply Unit.
2. Replace the Power Supply Unit.
voltages on the Power Supply Unit.
2. Replace the Power Supply Unit.
Yes
No
Clean or replace the rollers.
Paper Travel
Are the Fuser and Pressure Roller
surfaces clean?
surfaces clean?
96
4.4.9.
Horizontal White Lines
END
No
Yes
Clean or replace the rollers.
START
No
Yes
Check the Scanner mechanism.
Is the Toner Cartridge/
Drum Unit Assembly
operational?
Drum Unit Assembly
operational?
No
Yes
Is the recording paper damp?
Yes
No
Replace the recording paper.
Replace the Toner Cartridge/
Drum Unit Assembly.
Drum Unit Assembly.
Is the Power Supply Unit
normal?
normal?
1. Check all connectors and
voltages on the Power Supply
Unit.
Unit.
2. Replace the Power Supply Unit.
Yes
No
1. Clean the BTR with a soft, dry
cloth.
cloth.
2. Replace the BTR.
Are there any foreign particles
or stains on the BTR?
or stains on the BTR?
No
Yes
Paper Travel
P
Are the Fuser and Pressure
Roller surfaces clean?
Roller surfaces clean?
Is the printout in Service
Mode 3 normal?
Mode 3 normal?
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