• Code: U4 03
• Description: ADU rear edge plate operation abnormality. When the plate is not shifted from the home position for 1 sec or more or when returning to the home position is not detected for 5 sec or more.
• Causes: Home position sensor defect Rear edge plate shift motor defect Control PWB (PCU) defect Rear edge plate operation belt/gear damage or adjustment error
• Remedy: Check the home position sensor operation with SIM 9-21. Check the rear edge plate operation with SIM 9-31. Check between the PCU PWB, the motor, and the sensor. Remove the ADU and check the gear and the belt.

• Code: U5 00
• Description: RADF/SPF/RSPF communication trouble. Communication line test error occurs when power is turned on or after the exit of a simulation mode. Improper communication with RADF
• Causes: Improper connection or broken wire of connector or harness RADF control PWB defective Control PWB (PCU) defective Malfunction due to noise
• Remedy: Check communication line connector and harness. Clear the trouble by turning power supply On/Off.

• Code: U5 01
• Description: RADF resist sensor detection trouble
• Causes: Sensor defective Improper connection of sensor harness inside RADF. RADF control PWB defective
• Remedy: Check resist sensor detection with SIM2-2. Check sensor harness inside RADF.

• Code: U5 02
• Description: RADF eject/inversion sensor detection trouble
• Causes: Defective sensor Improper connection of sensor harness inside RADF. RADF control PWB defective
• Remedy: Check eject/inversion sensor detection with SIM2-2. Check sensor harness inside RADF.

• Code: U5 03
• Description: RADF timing sensor detection trouble
• Causes: Defective sensor Improper connection of sensor harness inside RADF RADF control PWB defective
• Remedy: Check timing sensor detection with SIM2-2. Check sensor harness inside RADF.

• Code: U5 06
• Description: RSPF post-separation sensor detection trouble (in auto adjustment).
• Causes: Sensor trouble. Bad connection of sensor harness in RSPF. RSPF control PWB trouble. Erroneous detection by paper dust.
• Remedy: Check detection of post-separation sensor with SIM2-2. Check RSPF sensor harness. Clean and remove paper dust.

• Code: U5 07
• Description: RSPF read sensor detection trouble (in auto adjustment)
• Causes: Sensor trouble. Bad connection of sensor harness in RSPF. RSPF control PWB trouble. Erroneous detection by paper dust.
• Remedy: Check detection of read sensor with SIM2-2. Check RSPF sensor harness. Clean and remove paper dust.

• Code: U5 08
• Description: RSPF SB sensor detection trouble (in auto adjustment)
• Causes: Sensor trouble. Bad connection of sensor harness in RSPF. RSPF control PWB trouble. Erroneous detection by paper dust.
• Remedy: Check detection of SB sensor with SIM2-2. Check RSPF sensor harness. Clean and remove paper dust.