• Code: C830
• Description: Original length sensor adjustment error: The original length sensor cannot be adjusted normally when performing the code 05-356.
• Remedy: (1) Check if there is any foreign matter between the original length sensor and reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the original length sensor and the RADF board is open-circuited. (3) Check the circuits and connectors on the RADF board, mainly IC3, IC4 and CN3, for short- and open-circuits. (4) Replace the original length sensor. (5) Replace the RADF board.

• Code: C940
• Description: Circuit related service call
  Engine-CPU abnormality
• Remedy: Is the “Call for Service” displayed even after the power is turned OFF and back ON ? NO Leave it and see what happens. YES 1. Check if the circuit pattern between the Engine-CPU and FROM is short- or open-circuited. 2. Replace the LGC board if this error occurs frequently.

• Code: C970
• Description: Process related service call
  High-voltage transformer abnormality: Leakage of the main charger is detected.
• Remedy: (1) Is the main charger installed securely? (2) Check if the spring of high-voltage supply contact point is deformed. (3) Check if the charger wire is broken or the main charger grid is deformed. (4) Check if any foreign matters are on the charger wire or main charger grid.

• Code: CA10
• Description: Polygonal motor abnormality: The polygonal motor is not rotating normally.
• Remedy: Is the polygonal motor rotating? NO 1. Check if the connector of the harness is disconnected between LGC board (CN308) and the laser optical unit? 2. Check if the harness is open-circuited and the connector pin is disconnected. 3. Check if the conductor pattern on the LGC board is short- or open-circuited. 4. Replace the laser optical unit. 5. Replace the LGC board. YES 1. Check if the conductor pattern on the LGC board is short- or open-circuited. 2. Replace the LGC board.

• Code: CA20
• Description: H-Sync detection error: H-Sync detection PC board cannot detect laser beams.
• Remedy: Are the harness open-circuited and the connectors disconnected between the LGC board (CN309) and LRL board (CN204), and between the LRL board (CN204) and laser optical unit ? YES Replace the harness. Connect the disconnected connectors. NO 1. Replace the LGC board. 2. Replace the laser optical unit.

• Code: CB20
• Description: Delivery motor abnormality: Delivery motor or delivery roller is not rotating normally. [MJ-1022]
• Remedy: MJ-1022 Rotate the delivery roller by hand. Does it rotate smoothly? NO Fix the mechanism. YES Is the wiring between the finisher controller PC board and delivery motor (M1) correct? NO Correct the wiring. YES Is the delivery motor clock sensor (S1) working properly? NO Replace the sensor. YES 1. Replace the delivery motor (M1). 2. Replace the finisher controller PC board.

• Code: CB30
• Description: Tray 1/Tray 2 shift motor abnormality: Tray 1/Tray 2 shift motor is not rotating or delivery tray is not moving normally. [MJ-1023/1024]
• Remedy: MJ-1023/1024 Are the tray 1 shift area sensors 1-3 and tray 2 shift area sensors 1-3 normal? NO Replace the tray 1/2 shift area sensor boards. YES Are the wirings between the finisher controller PC board and the tray 1/2 shift motors (M37/M38) correct ? NO Correct the wirings. YES Is there any problem with the tray lift mechanism? NO Fix the lift mechanism. YES 1. Replace the tray 1/2 shift motors. 2. Replace the finisher controller PC board.

• Code: CB40
• Description: Rear aligning plate motor abnormality: Rear aligning plate motor is not rotating or aligning plate is not moving normally. [MJ-1023/1024]
• Remedy: MJ-1023/1024 Is the rear aligning plate home position sensor (PI37) normal? NO Replace the sensor. YES Is the wiring between the finisher controller PC board and the rear aligning plate motor (M34) correct? NO Correct the wiring. YES Is there any mechanical problem with the path of aligning plate? NO Fix the mechanism. YES 1. Replace the rear aligning plate motor. 2. Replace the finisher controller PC board.