Troubleshooting Guide
510
Interval Possible cause Necessary actions
At intervals of 75.4 mm (2.96 inches) Defective OPC drum Replace the PCDU.
At intervals of 78.5 mm (3.09 inches) Defective pressure roller Replace the pressure roller or
fusing unit.
At intervals of 78.5 mm (3.09 inches) Defective fusing belt Replace the fusing unit.
At intervals of 40.82 mm (1.60 inches)
roller
Replace the image transfer
roller.
Dark Vertical Line on Prints
Symptom Possible cause Necessary actions
A dark line in one CMY color appears. The line is parallel
to the paper feed direction.
Defective PCDU Replace the PCDU.
A dark line in any color (not C, M, or Y) appears. The line
is parallel to the paper feed direction.
Dust in the laser beam
path
Clean the laser beam
path.
Defective image
transfer belt unit
Replace the image
transfer belt unit.
Defective fusing unit Replace the fusing unit.
White Horizontal Lines or Bands
Symptom Possible cause Necessary actions
White lines or bands appear in images. Defective PCDU Replace the PCDU.
Defective image transfer belt unit Replace the image transfer belt unit.
Defective paper transfer roller Replace the paper transfer roller.
Missing Parts of Images
Symptom Possible cause Necessary actions
Some parts of images are missing. Defective PCDU Replace the PCDU.
Defective image transfer belt unit Replace the image transfer belt unit.
Defective paper transfer roller Replace the paper transfer roller.
Defective fusing unit Replace the fusing unit.
Dirty Background
Symptom Possible cause Necessary actions
Backgrounds of one CMYK color are too dense. Defective PCDU Replace the PCDU.
Backgrounds of more than one CMYK color are too dense. Defective HVPS Replace the HVPS.
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