Ricoh Pro 8300S - LCT1: PSU Cooling Fan 1 Error (Vacuum Feed LCIT); Sc780-05

1.SC Codes
581
Major Cause
 Power of downstream unit is not turned on.
 Connector on the harness between PSU and PCB on LCT1 disconnected
 Harness broken
 PSU defective
 PCB defective
 24V line not grounded properly
Solution
In addition to checking for sensor/actuator defect by eye, also execute Input/Output Check as
necessary.
1. Reconnect the connector on the harness between the PSU and PCB on LCT1.
2. Replace the harness.
3. Replace the PCB.
4. Replace the PSU.
SC780-05
Error Name
LCT1: PSU Cooling Fan 1 Error (Vacuum Feed LCIT)
Pattern
B
Error Condition
Cooling fan alarm “H (error)” is detected when the PSU cooling fan 1 on the LCT1 is ON.
Major Cause
 Power of downstream unit is not turned on.
 PSU cooling fan 1 on the LCT1 defective / connector disconnected
 Harness damaged
 PCB defective
 PSU1 defective
Solution
In addition to checking for sensor/actuator defect by eye, also execute Input/Output Check as
necessary.
1. Reconnect the connector.
2. Replace the PSU cooling fan 1 on the LCT1.
3. Replace the harness.
4. Replace the PCB.