• Code: C911
• Description: Toner cartridge IC chip access board abnormality (caused by factors other than C910)
• Causes: Toner cartridge LGC board HRNS-LGC-TNRIC-140 CTIF board HRNS-TNRIC-140
• Remedy: 1 Does non-genuine toner cartridge display appear when the front cover is opened and closed? Yes Use the genuine toner cartridge. 2 No 2 2 Toner cartridge • Check the phenomenon by removing the toner cartridges (Y, M, C and K) and reinserting them. • Check that the CTRG board of each cartridge (Y, M, C and K) is installed properly. 3 Contact point on the equipment side Check that the spring of the contact point for each color (Y, M, C and K) is not deformed. 4 Is the spring of the contact point returned when it is pushed lightly? Yes No • Check that the CTIF board is installed properly. • Board check 7 Notes: The spring of the contact point may be released if you push the toner cartridge all the way in when an abnormality occurs. 5 LGC board • Connector check (CN364) • Board check 6 HRNS-LGC-TNRIC-140 • Relay connector check (J556, J557, J558, J559) • Harness check 7 CTIF board for each color (Y, M, C and K) • Check that the board is installed properly. • Board check 8 HRNS-TNRIC-140 for each color (Y, M, C and K) • Connector check • Harness check

• Code: C940
• Description: Engine-CPU abnormality
• Causes: LGC board
• Remedy: Main power switch Turn OFF the main power switch, then back ON. Engine-CPU, FROM, and SRAM Check if the conductor pattern between the Engine-CPU, FROM, and SRAM is short circuited or open circuited. LGC board Board check

• Code: C962
• Description: LGC board ID abnormality
• Causes: LGC board IMG board
• Remedy: LGC board • Connector check (CN344, CN354) • Board check IMG board • Connector check (CN423, CN425) • Board check

• Code: C970
• Description: High-voltage transformer abnormality: Leakage of the main charger is detected.
• Causes:
• Remedy: Main charger Check if the main charger is installed securely. Spring of high-voltage supply contact point Check if the spring of high-voltage supply contact point is deformed. Needle electrode • Check if the needle electrode is broken or the main charger grid is deformed. • Check if any foreign matter is on the needle electrode or main charger grid.

• Code: C9E0
• Description: Connection error between SLG board and SYS board
• Causes: SLG board IMG board SYS board
• Remedy: SLG board • Connector check (CN12) • Board check IMG board • Connector check (CN421, CN422) • Board check SYS board • Connector check (CN135) • Board check

• Code: CA00
• Description: color registration abnormality
• Causes:
• Remedy: 1 <Color toner low density> Check the printing status. Is the color printing ratio 5% or more? Yes 2 No The color toner low density might be the cause. Turn the code 08-2692 "Prevention of color toner low density / ON/OFF setting" to ON, and then set number of sheets to be judged at the code 08- 2693 "Prevention of color toner low density/Judged number of sheets setting". 2 Open the front cover and take off the exit tray. (Refer to "4.1.2 Exit Tray".) 3 Take off toner cartridges (Y) and (M), and then close the front cover. 4 Perform color registration pattern / image quality control pattern.Is an image created on the transfer belt? Yes 8 No 5 5 Check if there is any abnormality on the hand grips and rods of the main charger cleaner. Correct if there is. 6 Check if the drum is rotated properly by turning the coupling of the developer unit. Correct the auger and the surrounding hardware if not. 7 Laser optical unit • Check the connectors and harnesses between the LGC board (CN343, CN355, and CN356) and the laser optical unit. • Check if there is any stain or scratch on the glass surface of the laser optical unit. Clean or correct if there is. 8 Check if there is any stain on the image quality sensor and Image position aligning sensors. 9 Check if the sensor shutter is working properly. 10 < Invalidating color registration control > • Turn the power ON while [0] and [8] are pressed simultaneously. • Key in “4546”, then press the [START] button. (08-4546: Position adjustment control / Mode setting) • Set the value to “0” (not performed automatically). • Turn the power OFF. 11 < Checking the abnormal status on color registration > • Turn the power ON while [0] and [5] are pressed simultaneously. • Key in “4720”, then press the [START] button. (05-4720: Displaying the cause of color registration detection error)

• Code: CA10
• Description: Polygonal motor abnormality: The polygonal motor is not rotating normally.
• Causes: Laser optical unit LGC board
• Remedy: 1 Is the polygonal motor rotating? Yes 3 No 2 2 Polygonal motor Connector check 3 LGC board • Connector check (CN343, J506) • Board check 4 Laser unit cooling fan • Check if the laser unit cooling fan is stopped. • Check if the suction area of the laser unit cooling fan is plugged up. 5 Units with high-voltage • Check if the units with high-voltage (developer unit, transfer belt unit, 2nd transfer roller unit) are securely grounded. • Check if the bias supply joints of the units with high-voltage are securely connected or they are not stained. 6 Plate in the paper transport system Check if the plate in the paper transport system is securely grounded. 7 Equipment Check if the equipment is grounded. 8 Laser unit cooling fan • Check if the laser unit cooling fan is stopped. • Check if the suction area of the laser unit cooling fan is plugged up. e-STUDIO4540C 1 Is the polygonal motor rotating? Yes 2 No 3 2 Is the printed image distorted? Yes 3 No 6 3 POL board • Connector check (connectors on the both edges of the HRNS-POLDRV- 382) • Board check 4 4 LGC board • Connector check (CN343, J506) • Board check 5 5 Laser unit cooling fan • Check if the laser unit cooling fan is stopped. • Check if the suction area of the laser unit cooling fan is plugged up. 6 LGC board Board check 7 Units with high-voltage • Check if the units with high-voltage (developer unit, transfer belt unit, 2nd transfer roller unit) are securely grounded. • Check if the bias supply joints of the units with high-voltage are securely connected or they are not stained. 8 Plate in the paper transport system Check if the plate in the paper transport system is securely grounded. 9 Equipment Check if the equipment is grounded. 10 Laser unit cooling fan • Check if the laser unit cooling fan is stopped. • Check if the suction area of the laser unit cooling fan is plugged up.

• Code: CA20
• Description: H-Sync detection error: H-Sync signal detection PC board cannot detect laser beams.
• Causes: Power supply unit Laser optical unit LGC board
• Remedy: 1 LGC board • Check the connectors and harnesses between CN356 and LDR board. • Check the connectors and harnesses between CN355 and SNS board. • Connector check (J503, J505) 2 Front cover ADU Close the front cover and ADU if it is open. 3 Is the pin CN405-4 on the power supply unit +5V? Yes 4 No 5 4 Is the pin CN361-4 on the LGC board +5V? Yes 6 No 5 5 Power supply unit Check the connectors and harnesses between the power supply unit and LGC board. 6 LGC board Board check 7 Units with high-voltage • Check if the units with high-voltage (developer unit, transfer belt unit, 2nd transfer roller unit) are securely grounded. • Check if the bias supply joints of the units with high-voltage are securely connected or they are not stained. 8 Plate in the paper transport system Check if the plate in the paper transport system is securely grounded. 9 Equipment Check if the equipment is grounded. 10 Laser unit cooling fan • Check if the laser unit cooling fan is stopped. • Check if the suction area of the laser unit cooling fan is plugged up.