Ricoh MP C2504 Field Service Manual page 873

6. Troubleshooting
SC No.
SC665-08
864
Type Error Name/Error Condition/Major Cause/Solution
D IOB signal Communication Error
The machine detects the communication error between CPU and Slave1
when starting up, or recovery from energy saver mode.
• FFC connection error
• FFC defective (disconnected, foreign object, etc.)
• The following board defects (Parts implementation defect, solder
scrap, implemented parts defect, etc.);
• BCU
• Imaging IOB
• Paper Transport IOB.
1. Turn the main power OFF/ON.
2. Reconnect the following FFC;
• BCU - Imagine IOB
• Imaging IOB - Paper Transport IOB
3. Replace the following FFC;
• BCU - Imagine IOB
• Imaging IOB - Paper Transport IOB
4. Replace the BCU.
5. Replace the Imaging IOB.
6. Replace the Paper Transport IOB.