• Code: C5A0
• Description: SRAM board not connected (LGC board). SRAM board data abnormality (LGC board)
• Causes: SRAM board LGC board
• Remedy: SRAM board • Connector check (CN170) • Board check LGC board • Connector check (CN363) • Board check

• Code: C5A1
• Description: SRAM board data abnormality (LGC board)
• Causes: SRAM board LGC board
• Remedy: SRAM board • Connector check (CN170) • Board check LGC board • Connector check (CN363) • Board check

• Code: C8E0
• Description: RADF communication protocol abnormality. The system has to be stopped because the control abnormality occurred.
• Causes: RADF board
• Remedy: Power Turn the power OFF and then back ON to check if the equipment operates normally. RADF board • Connector check • Board check

• Code: C900
• Description: Connection error between the SYS board and the LGC board
• Causes: LGC board IMG board SYS board
• Remedy: LGC board • Connector check (CN354) • Board check IMG board • Connector check (CN422, CN423) • Board check SYS board • Connector check (CN135) • Board check

• Code: C901
• Description: System format error for scanner
• Causes: LGC board IMG board SYS board
• Remedy: Main power switch Does service call still occur even after turning OFF the main power switch then back ON? SLG board • Connector check (CN12) • Board check SYS board • Connector check (CN135) • Board check

• Code: C910
• Description: Toner cartridge IC chip access board abnormality. Abnormal access between the CTRG board and LGC board
• Causes: Toner cartridge LGC board HRNS-LGC-TNRIC-140 CTIF board HRNS-TNRIC-140
• Remedy: 1 Does the 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: C911
• Description: Toner cartridge IC chip access board abnormality (caused by factors other than C910). Abnormal access between the CTRG board and LGC board (High possibility of failure except the LGC board)
• 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