• Code: SC503
• Description: Tray 3 error (Paper Feed Unit or LCT) This SC is generated if the following condition occurs 3 consecutive times. For the paper feed unit: • When the tray lowers, the tray lift sensor does not go off within 15 sec. For the LCT: • When the main switch is turned on or when the LCT is set, if the end fence is not in the home position (home position sensor ON), the tray lift motor stops. • If the upper limit does not go off for 8 seconds even the tray lift motor turns on to lower the tray after the upper limit has been detected at power on.
• Causes: For the paper feed unit: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection For the LCT: • Defective stack transport clutch or connector disconnection • Defective tray motor or connector disconnection • Defective end fence home position sensor or connector disconnection
• Remedy: • Check the cable connections. • Check and/or replace the defective component. • Replace the BCU.

• Code: SC504
• Description: Tray 4 error (3 Tray Paper Feed Unit) This SC is generated if the following condition occurs 3 consecutive times. • When the tray lowers, the tray lift sensor does not go off within 1.5 sec.
• Causes: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection
• Remedy: • Check the cable connections. • Check and/or replace the defective component. • Replace the BCU.

• Code: SC508
• Description: By-pass bottom plate error The signal from the by-pass tray HP sensor does not change for 1.0 second after the by-pass motor has rotated counterclockwise. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Disconnect or defective harness of the by-pass motor • Defective or disconnected connection for the by-pass motor. • Defective by-pass motor • Disconnect or defective harness of the by-pass HP sensor • Defective or disconnected connection for the by-pass HP sensor. • Defective by-pass HP sensor
• Remedy: • Check the cable connections. • Check and/or replace the defective component. • Replace the BCU. • Cycle the main power off/on

• Code: SC530
• Description: Fusing exhaust fan motor error • This fan is located on the left side of the machine, next to the PSU. The machine does not detect the motor lock signal for 10 seconds while the motor is running.
• Causes: • An obstruction has blocked operation of the main motor • Main motor harness loose or broken
• Remedy: • Turn the main power switch OFF and then ON again. • Replace the fan.

• Code: SC531
• Description: Duplex fan motor error • This fan is located on the front of the machine, near the fusing unit. The machine does not detect the motor lock signal for 10 seconds while the motor is running.
• Causes: • An obstruction has blocked operation of the main motor • Main motor harness loose or broken
• Remedy: • Turn the main power switch OFF and then ON again. • Replace the fan.

• Code: SC532
• Description: CTL fan motor error The machine does not detect the motor lock signal for 10 seconds while the motor is running.
• Causes: • An obstruction has blocked operation of the main motor. • Main motor harness loose or broken
• Remedy: • Turn the main power switch OFF and then ON again. • Replace the fan.

• Code: SC541
• Description: Fusing thermistor open (center) The temperature of the hot roller remained below 0°C for 5 sec at the center of the hot roller.
• Causes: • Fusing thermistor out of its position because of incorrect installation • Fusing thermistor disconnected or defective • Power supply not within rated range (15% or more below rating)
• Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check the power supply source.

• Code: SC542-01
• Description: Fusing central thermopile does not reload Temperature gradient detection:Temperature rise of 2 seconds is detected by five consecutive four degrees or less
• Causes: • Fusing thermistor defective or out of position • Fusing thermistor modification/float • Outside input voltage guarantee
• Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check that the input voltage is within acceptable limits. • Replace the fusing unit. • Repace the BCU. • Replace the fusing lamp in the case of disconnection.