Ricoh SP 8400DN Field Service Manual page 1319

SC No. Type
The entrance fan motor lock is detected.
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Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by
turning the main power OFF then ON. If the SC occurs again, do the following steps. Check
if the SC reoccurs by cycling the power after each step.
1.
2.
3.
4.
5.
SC No. Type
SC761 Bridge Unit BU3070 (D685) Error
SC761- B Protection Device Intercept Error 5V
03
SC761- B Protection Device Intercept Error 24V
04
Fuse blowout occurs due to over current during power injection (output detected for longer
than 2 seconds).
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SC No. Type
SC780- D Bank 1 (Upper optional paper tray) Protection Device Intercept Error
01
When original source of 5V power supply is ON, protection device intercept of 24V power
system is detected.
In 24V power supply system:
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Error Name/Error Condition/Major Cause/Solution
Motor defective
Harness broken
Connector disconnected
Controller board detective
Check if all connectors between the controller board and the motors/sensors are
connected securely. Reconnect the connectors if they are disconnected, or loose.
Replace the harness if it is disconnected, or damaged.
Check if the motor runs, has no overloads, and is properly driven. Replace the parts if
there are any defects.
Check if the sensor turns OFF/ON. Replace the parts if there are any defects.
Check if there are any signs of a short circuit. Replace the parts if there are any defects.
Error Name/Error Condition/Major Cause/Solution
Over current of bridge unit motor
Over current due to short-circuit in PCB
Replace the bridge unit or side tray.
Replace the PCB of bridge unit or side tray.
Error Name/Error Condition/Major Cause/Solution
Motor defective
Solenoid defective
6.Troubleshooting
581