Ricoh IM 550F

6.Troubleshooting
564
SC No.
Type
Error Name/Error Condition/Major Cause/Solution
• IOB (PCB17) defective
• Connector pin defective
If the I/F connector pins of the fuser unit and the main unit are deformed owing
to foreign materials, replace the connectors or the units including the
connectors.
• Triac defective
Disconnect the power cord and check that the resistance between terminals
T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are
several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
• Fusing thermistor defective
Replace the fusing unit.
• IOB (PCB17) defective
Replace the IOB (PCB17).
SC No.
Type
Error Name/Error Condition/Major Cause/Solution
SC581-
00
C
Temperature Sensor Disconnected Error
• The average of the output from the temperature sensor is 1019 or more for
160 ms.
• The average of the output from the temperature sensor is 930 or more for 5
seconds.
• Temperature sensor defective
• IOB (PCB17) defective
• Temperature sensor defective
1. Reconnect the following connector.
• Temperature Sensor – IOB (PCB17) connector
2. If the connector is broken, shorted, or grounded, replace the connector.
3. Replace the temperature sensor.
• IOB (PCB17) defective
1. Update the engine software to the latest version.
2. Replace the IOB (PCB17).