• Code: C940
• Description: Engine-CPU abnormality
• Remedy: Does service call still occur even after turning OFF the main switch then back ON? → NO → Leave it for a while and see how. YES 1) Check if the conductor pattern between the Engine-CPU and FROM is short circuited or open circuited. 2) Replace the LGC board if it frequently occurs.

• Code: C950
• Description: LGC board memory abnormality
• Remedy: (1) Check if the connectors CN331 and CN 343 on the SYS board are completely inserted or not disconnected. (2) Check if the connector CN434 on the DRV board is completely inserted or not disconnected. (3) Check if the conductor pattern on each board is short circuited or open circuited. (4) Replace the NVRAM. (5) Replace the LGC board. (6) Replace the DRV board. (7) Replace the SYS board. (8) Ask a specialist for a repair (Abnormal ID).

• Code: C960
• Description: Connection error between LGC board and DRV board, ID abnormality
• Remedy: (1) Check if the connectors CN331 and CN343 on the LGC board are completely inserted or not disconnected. (2) Check if the connector CN434 on the DRV board is completely inserted or not disconnected. (3) Check if the harness connecting the DRV board (J434) and the LGC board (CN360) is open circuited. (4) Check if the harness connecting the LGC board (CN331) and the high-voltage transformer (J480) is open circuited. (5) Check if the conductor pattern on each board is short circuited or open circuited. (6) Replace the DRV board. (7) Replace the LGC board. (8) Ask a specialist for a repair (Abnormal ID).

• Code: C970
• Description: 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 matter is on the charger wire or main charger grid.

• Code: C9E0
• Description: Connection error between SLG board and SYS board
• Remedy: (1) Check if the connector CN18 of the SLG board is completely inserted or not disconnected. (2) Check if the connector CN102 of the SYS board is completely inserted or not disconnected. (3) Check if the harness connecting the SLG board (CN18) and the SYS board (CN102) is open circuited. (4) Check if the conductor pattern on each board is short circuited or open circuited. (5) Replace the SLG board. (6) Replace the SYS board.

• 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 CN342 on the LGC board is disconnected. 2) Check if the harness is open circuited or the connector pin is disconnected. 3) Check if the conductor pattern on the LGC board is short circuited or open circuited. 4) Replace the laser optical unit. 5) Replace the LGC board. YES Is the printed image distorted? ↓→ YES → 1) Check if the connector CN342 on the LGC board is almost disconnected. 2) Check if the harness is almost open circuited or the connector pin is almost disconnected. 3) Check if the conductor pattern on the LGC board is short circuited or open circuited. 4) Check if the laser unit cooling fan is stopped. 5) Check if the suction area of laser unit cooling fan is plugged up. 6) Replace the laser optical unit. 7) Replace the LGC board. NO 1) Check if the conductor pattern on the LGC board is short circuited or open circuited. 2) Check if the units with high-voltage (developer unit, transfer belt unit and 2nd transfer roller unit) are securely grounded. 3) Check if the bias supply joints of the units with high-voltage are securely connected or they are not stained. 4) Check if the plate in paper transport system is securely grounded. 5) Check if the equipment is grounded. 6) Check if the laser unit cooling fan is stopped. 7) Check if the suction area of laser unit cooling fan is plugged up. 8) Replace the laser optical unit. 9) Replace the LGC board.

• Code: CA20
• Description: H-Sync detection error: H-Sync signal detection PC board cannot detect laser beams.
• Remedy: Is the cable (flexible flat type) between the connector (CN345) on the LGC board and connector (CN201) on the LDR board open circuited, broken or disconnected? ↓→ YES → 1) Reconnect the cable. 2) Check if the connector on the LGC board hold the cable securely. 3) Replace the laser optical unit. NO 1) Check if the units with high-voltage (developer unit, transfer belt unit and 2nd transfer roller unit) are securely grounded. 2) Check if the bias supply joints of the units with high-voltage are securely connected or they are not stained. 3) Check if the plate in paper transport system is securely grounded. 4) Check if the equipment is grounded. 5) Check if the conductor pattern is short circuited or open circuited. 6) Replace the LGC board. 7) 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. 2) Replace the finisher controller PC board.