Ricoh MP C307 Field Service Manual page 440

SC4xx: Image Processing
No. Type
First, cycle the main power off/on to check if this SC occurs again.
If this SC reoccurs, do the following:
1.
2.
3.
4.
5.
6.
7.
8.
9.
No. Type
SC492-00 C
434
Details (Symptom, Possible Cause, Troubleshooting Procedures)
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.
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.
Replace the PCDU and cycle the main power off/on to check if this SC occurs again.
Reconnect the connector (CN561) on the BiCU 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.
Reconnect the connector (CN801) on the power pack (charge/development) and cycle
the main power off/on. If the SC occurs again, go to the next step.
Remove and install the power pack (charge/development) again and cycle the main
power off/on. Check if the spring near the power pack terminal bends and comes in
contact with other contacts. Cycle the main power off/on to check if this SC occurs
again.
Replace the power pack (charge/development) and cycle the main power off/on to check
if the SC occurs again.
Replace the BiCU and cycle the main power off/on to check if the SC occurs again.
Make sure that the harnesses on the power pack (charge/development) are not shorted. If
not good, replace the harness and cycle the main power off/on.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
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)
•
BiCU malfunction (Signal error)
•
Power pack (Transfer) failure
Load related causes:
•
Increased impedance in the paper transfer roller
•
Increased impedance in the ITB
•
Open-circuit