Ricoh MP C6502SP Field Service Manual page 1173

SC No. Level
SC665-01 D
Error Name/Error Condition/Major Cause/Solution
FFC set detection (Error between IPU and BCU)
The HORUS port on the BCU is used for FFC connection detection to
detect FFC (harness) disconnection and loose connection between BCU
and IPU. By checking the "H" or "L" status of this port, the connection
status can be checked.
• Normal condition (Connector connected): "H" at the HORUS port
on the BCU.
• Abnormal condition (Connector not connected): "L" at the HORUS
port on the BCU.
Details:
• When a connector is disconnected, the voltage level becomes "L"
level (0V level) because there is a pull-down resistor in the BCU.
• FFC harness between BCU and IPU broken
• FFC harness between BCU and IPU not connected fully
• BCU damaged
• IPU damaged
• Replace the FFC harness between BCU and IPU.
• Reconnect the FFC harness between BCU and IPU.
• Replace the BCU board.
• Replace the IPU.
Service Call 620-689
1171