Ricoh A229 Service Manual page 444

SC620-1: Communication error between SBICU and ADF 1
-Definition- [B]
The TXD and RXD signals between SBICU and ADF main board do not
stabilize.
- Possible causes -
• Poor connection between the SBICU board and ADF main board
• Noise on interface cable
SC620-2: Communication error between SBICU and ADF 2
-Definition- [B]
The TXD and RXD signals between SBICU and ADF main board do not
stabilize.
- Possible causes -
• Poor connection between the SBICU board and ADF main board
• ADF main board defective
• SBICU board defective
SC620-3: Communication error between SBICU and ADF 3
-Definition- [B]
Software error after abnormal user operation.
- Possible causes -
• Software error
SC621: Communication error between SBICU and finisher
-Definition- [B]
The SBICU cannot communicate with the finisher properly.
- Possible causes -
• Poor connection between the SBICU board and the finisher main board
• Finisher main board defective
• SBICU board defective
• Noise on interface cable
SM
SERVICE CALL CONDITIONS
6-21 A229