All-Black Print; Missing Cmy Color; Light Print - Ricoh IM C300 Service Manual

6.12.8 ALL-BLACK PRINT

Symptom
All the paper is black.

6.12.9 MISSING CMY COLOR

Symptom
C, M, or Y is Defective PCDU
missing.
Loss of Primary Transfer HV
output
Image transfer belt not
contacting PCDU
Defective the drum motor
(CMY) (M10)
Defective BiCU (PCB1)

6.12.10 LIGHT PRINT

Symptom
Printed images are Loose connection between paper
too weak. 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 BiCU (PCB1)
SM
Possible cause
Incorrectly installed PCDU
Defective PCDU
Defective HVPS
Defective laser unit
Defective BiCU (PCB1)
Defective main board
Possible cause
Possible cause
6-147
Troubleshooting for Image Quality Problems
Necessary actions
Install the PCDU correctly.
Replace the PCDU.
Replace the HVPS.
Replace the laser unit.
Replace the BiCU (PCB1).
Replace the main board.
Necessary actions
Replace the PCDU.
Replace High-Voltage Power Supply
(Transfer) (PCB23).
Check the belt tension unit.
Replace the drum motor (CMY) (M10).
Replace the BiCU (PCB1).
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.
Replace the paper transfer roller.
Replace the fusing unit.
Replace the BiCU (PCB1).
D0CA/D0C9/D0C8/D0CB