Sc272-10 - Ricoh MP 305 Plus Field Service Manual

6. Troubleshooting
Symptoms
There is a communication error between the CPU and the LD driver.
This SC is detected when the main power is turned ON, when the machine recovers from Energy
Save, or during printing.
Possible Causes
• The LDB is malfunctioning (LD driver is defective).
• The BiCU is malfunctioning (the I/F between the CPU and the LD driver is defective).
• The LDB harness is defective.
Troubleshooting Procedures
1. Turn OFF then ON the main power.
2. Check the harness between the LDB and BiCU. Replace it if needed.
3. Replace the Laser unit.
4. Replace the BiCU.
5. Replace the harness between the LDB and the BiCU.

SC272-10

Error Name
LD Driver Communication Error: Others
Type
D
Symptoms
The power source of the LD board is wrong.
This SC is detected when the main power is turned ON, the machine recovers from Energy Save, or
when covers are closed.
Possible Causes
• The BiCU is malfunctioning (LD5V power source is wrong).
• The LDB is malfunctioning (LD driver is defective).
• The LDB harness is defective.
• The interlock switch is defective.
Troubleshooting Procedures
1. Turn OFF then ON the main power.
2. Check the harness between the LDB and BiCU. Replace it if needed.
3. Replace the BiCU.
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