Ricoh D0C8, Service Manual

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SC4xx: Image Processing
D0CA/D0C9/D0C8/D0CB 6-32 SM
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
First, cycle the main power OFF/ON to check if this SC occurs again.
If this SC reoccurs, do the following:
1.
Remove and install the PCDU again to make sure that the PCDU is firmly
set. Cycle the main power OFF/ON to check if this SC occurs again. If the
SC occurs again, go to the next step.
2.
Check if there are scratches on the drum surface. If you can see the
internal element of the drum (plain pipe) on the surface, go to the next
step, because too much electricity can flow at this point, which caused
the SC.
3.
Replace the PCDU and cycle the main power OFF/ON to check if this SC
occurs again.
4.
Reconnect the connector (CN561) on the BiCU (PCB1) and cycle the
main power OFF/ON. Be careful not to bend the connector pins when
reconnecting. If the SC occurs again, go to the next step.
5.
Reconnect the connector (CN801) on the High-Voltage Power Supply
(Development) (PCB22) and cycle the main power OFF/ON. If the SC
occurs again, go to the next step.
6.
Remove and install the High-Voltage Power Supply (Development)
(PCB22) again and cycle the main power OFF/ON. Check if the spring
near the High-Voltage Power Supply (Development) terminal bends and
comes in contact with other contacts. Cycle the main power OFF/ON to
check if this SC occurs again.
7.
Replace the High-Voltage Power Supply (Development) (PCB22) and
cycle the main power OFF/ON to check if the SC occurs again.
8.
Replace the BiCU (PCB1) and cycle the main power OFF/ON to check if
the SC occurs again.
9.
Make sure that the harnesses on the High-Voltage Power Supply
(Development) (PCB22) are not shorted. If not good, replace the harness
and cycle the main power OFF/ON.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC492-00 C
High Voltage Power: Transfer Bias Output Error
Incorrect PWM signal is detected for 0.2 sec.
Hardware related causes:
• Contact failure
• Loose connector (Controller side)
• Grounding, open-circuit in the high voltage route
• Shorted harness (Controller side)