Ricoh Aficio SP C440DN Field Service Manual page 620

6. Troubleshooting
Missing CMY Color
Symptom
C, M, or Y is missing.
Light Print
Symptom
Printed images are too weak.
Repeated Spots or Lines on Prints
Image problems may appear at regular intervals that depend on the circumference of certain
components.
The following diagram shows the possible symptoms (black or white dots at regular intervals).
618
Possible cause
Defective PCDU
Loose connection between
printer cartridge and BCU
Image transfer belt not
contacting PCDU
Defective the drum motor: CMY
Defective BCU
Possible cause
Loose connection between
paper transfer roller and HVPS
Dust in the laser beam path
Image transfer belt not
contacting PCDU
Defective PCDU
Defective paper transfer roller
Defective fusing unit
Defective BCU
Necessary actions
Replace the PCDU.
Replace the drum positioning
cover.
Check the belt tension unit.
Replace the drum motor: CMY.
Replace the BCU.
Necessary actions
Check the connection between
the paper transfer roller and the
HVPS.
Clean the laser beam path.
Check the image transfer belt
unit.
Replace the PCDU.
Repair the paper transfer roller.
Replace the fusing unit.
Replace the BCU.