Ricoh Pro 8320 - LD ASIC Communication Error: Others; Sc270-10

1.SC Codes
53
Pattern
D
Error Condition
The BiCU (CPU) and the LDB (special IC) did not communicate normally.
Major Cause
 Harness for the laser unit is not connected correctly.
 LDB is defective (special IC defective).
 BiCU is defective (CPU defective).
 Harness for the laser unit is defective.
Solution
1. Harness for the laser unit not connected correctly
Inspect and reconnect the harness between the laser unit and the BiCU, and then check if the SC
reoccurs.
2. LDB defective (special IC defective)
Replace the laser unit.
3. BiCU defective (CPU defective)
Replace the BiCU.
4. Harness for the laser unit defective
Replace the harness between the laser unit and the BiCU.
SC270-10
Error Name
LD ASIC Communication Error: Others
Pattern
D
Error Condition
The power supply for the LDB (+5 VS) was OFF with the doors of the main machine closed.
*The BiCU generates the power supply for the LDB (+5 VS) from the power supply (+24 VS) which is
turned ON only when the doors of the main machine are closed.
Major Cause
 Power harness is not connected correctly.
 BiCU is defective (faulty power supply for the LDB (+5 VS)).
 PSU (PSU-A) is defective (faulty power supply for the LDB, fuse defective).
 Power harness is damaged, disconnected, or shorted.