Panasonic KX-MB771GR Service Manual page 104

KX-MB771GR
12.3.5. SIMPLIFIED TROUBLESHOOTING GUIDE
12.3.5.1. PRINTING
No. Symptom
1 GHOST IMAGE (P.114)
2 DARK OR WHITE VERTI-
CAL LINE (P.115)
3 DARK OR WHITE HORI-
ZONTAL LINE (P.116)
4 DIRTY OR HALF DARK-
NESS BACKGROUND
(P.117)
5 BLACK PRINT (P.118)
6 LIGHT PRINT (P.119) OR
BLACK PRINT (P.118)
7 BLACK OR WHITE POINT
(P.120)
Cause
Failed drum unit
Failed transfer unit
Failed the high-voltage terminal
Failed the high voltage power supply board
Failed fuser unit
Too thick or too thin recording paper
Dirty the cover glass or the reflecting mirror
Dust on the path of the laser beam
Failed drum unit
Failed the heat roller or the pressurized roller
Failed LSU
Failed drum unit
Failed the gear
Failed the engine motor
Failed the high-voltage terminal
Failed the high voltage power supply board
Scratch on the OPC drum
Static electricity on the documents (when copy-
ing)
Failed drum unit
Dirty the pickup roller and the regist roller and
the feed roller and the eject roller and the heat
roller and the pressure roller
Failed the high-voltage terminal
Failed the high voltage power supply board
Dirty the recording paper path
Failed drum unit
Failed LSU
Failed the high-voltage terminal
Failed the high voltage power supply board
Failed the digital board
Failed CIS (when copying)
Short toner
Failed drum unit
Life of drum unit is over
Dirty the cover glass or the reflecting mirror
Failed the high-voltage terminal
Failed the high voltage power supply board
Failed the digital board
Failed CIS (when copying)
Failed the developer roller (32mm pitch)
Failed the OPC drum (75mm pitch)
Failed the heat roller (79mm pitch)
Failed the high voltage power supply board
Too thick or too thin recording paper
Replace drum unit
Check the transfer roller and spring
Check the high-voltage terminal
Go to HIGH VOLTAGE SECTION (P.165)
Check the heat roller and the pressurized roller and the spring
and the heat lamp and the thermistor
Use the recording paper from 16lb to 24lb
Clean the cover glass and the reflecting mirror
Clean the path of the laser beam
Replace drum unit
Check the heat roller and the pressurized roller
Go to LSU (Laser Scanning Unit) SECTION (P.40)
Replace drum unit
Check the gear
Go to FB (Flatbed) MOTOR (P.158)
Check the high-voltage terminal
Go to HIGH VOLTAGE SECTION (P.165)
Replace drum unit
Check the connection between the parts around CIS and earth
Replace drum unit
Clean the pickup roller and the regist roller and the feed roller
and the eject roller and the heat roller and the pressure roller
Check the high-voltage terminal
Go to HIGH VOLTAGE SECTION (P.165)
Clean the recording paper path
Replace drum unit
Go to LSU (Laser Scanning Unit) SECTION (P.40)
Check the high-voltage terminal
Go to HIGH VOLTAGE SECTION (P.165)
Check the digital board
Go to CIS CONTROL SECTION (P.161)
Supply toner
Replace drum unit
Replace drum unit
Clean the cover glass and the reflecting mirror
Check the high-voltage terminal
Go to HIGH VOLTAGE SECTION (P.165)
Check the digital board
Go to CIS CONTROL SECTION (P.161)
Replace drum unit
Replace drum unit
Check the heat roller
Go to HIGH VOLTAGE SECTION (P.165)
Use the recording paper from 16lb to 24lb
104
Countermeasure