Ricoh D0C8, Service Manual

Page: 597 / 1647

SC3xx: Image Processing
SM 6-23 D0CA/D0C9/D0C8/D0CB
Tr
ou
bl
es
ho
ot
in
g
6.4 SC3XX: IMAGE PROCESSING
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC312-01 D Charge Roller Feed back Voltage Error: K
SC312-02 D
Charge Roller Feed back Voltage Error: C
SC312-03 D Charge Roller Feed back Voltage Error: M
SC312-04 D Charge Roller Feed back Voltage Error: Y
The feedback voltage of the charge AC for each color is 0.15V or less for
consecutive 200ms after the charge AC is activated in the standard or half line
speed.
•
Disconnected/incorrect harness for the High-Voltage Power Supply
(Development) (PCB22)
•
Damaged/incorrect PCDU
•
High-Voltage Power Supply (Development) failure
•
Disconnected harness/connector
Troubleshooting procedure :
Check if the SC occurs by turning the power OFF then ON. If the SC occurs
again, do the following steps. Check if the SC reoccurs by cycling the power
after each step.
1. Check the drum condition:
Check the terminal [A] (see the picture below for the terminal location) to
see if there is dust, damage, or deformation.
If there are any defects, replace the PCDU.
2. Check all the related connectors are firmly connected:
If not good, reconnect the connector.
3. Check the mainframe condition:
Check if there is dust on the terminal for charging, or any
damage/deformation. Check the continuity between the High-Voltage
Power Supply (Development) (PCB22) and charging terminal.
4. Check the High-Voltage Power Supply (Development) (PCB22):
Try installing a new High-Voltage Power Supply (Development) (PCB22)
to determine whether the High-Voltage Power Supply (Development)
(PCB22) is the cause. If the SC does not occur with the new one, the old
High-Voltage Power Supply (Development) (PCB22) was defective.
5. Replace the BiCU (PCB1).