• Code: C225B
• Description: PC motor/K’s failure to turn
  The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
• Causes: • PC motor/K (M18) • Printer control board (PRCB)
• Remedy: 1 Check the connector between M18-PRCB CN21 for proper connection and correct as necessary. 2 Check the M18 connector for proper drive coupling and correct as necessary. 3 M18 operation check PRCB CN21-13 (LOCK) PRCB CN21-10 (REM) 16-K. 4 Replace M18. 5 PRCB ICP6 or ICP18 conduction check. 6 Replace PRCB.

• Code: C225C
• Description: PC motor/K’s turning at abnormal timing
  The motor lock signal remains LOW for a predetermined continuous period of time while the motor remains stationary.
• Causes: • PC motor/K (M18) • Printer control board (PRCB)
• Remedy: 1 Check the connector between M18-PRCB CN21 for proper connection and correct as necessary. 2 Check the M18 connector for proper drive coupling and correct as necessary. 3 M18 operation check PRCB CN21-13 (LOCK) PRCB CN21-10 (REM) 16-K. 4 Replace M18. 5 PRCB ICP6 or ICP18 conduction check. 6 Replace PRCB.

• Code: C2350
• Description: Toner suction fan’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Toner suction fan (FM7) • Printer control board (PRCB)
• Remedy: 1 Check the connector between FM7-PRCB CN2 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM7 operation check PRCB CN2-4 (DRIVE) PRCB CN2-6 (LOCK) 2-K. 4 Replace FM7. 5 Replace PRCB.

• Code: C2353
• Description: IU cooling fan’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • IU cooling fan (FM15) • PH relay board (PHRYB) • Printer control board (PRCB)
• Remedy: 1 Check the connector between M15-relay CN707- PHRYB CN5 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM15 operation check PHRYB CN5-1 (REM) PHRYB CN5-3 (LOCK) 7-B. 4 Replace FM15. 5 PHRYB ICP6 conduction check. 6 Replace PHRYB. 7 Replace PRCB.

• Code: C2414
• Description: Developing unit/K new release failure
  The status with the new unit is not cleared after the new developing unit is set.
• Causes: • Developing unit • Printer control board (PRCB)
• Remedy: 1 Reinstall developing unit. 2 Replace the developing unit. 3 Replace PRCB.

• Code: C2551
• Description: Abnormally low toner density detected cyan TCR sensor
  When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Toner cartridge /C • Toner cartridge /M • Toner cartridge /Y • Toner empty sensor/C (RS/C) • Toner empty sensor/M (RS/M) • Toner empty sensor/Y (RS/Y) • Toner supply motor/Y (M9) • Toner supply motor/M (M10) • Toner supply motor/C (M11) • Toner cartridge motor /YM (M13) • Toner cartridge motor /CK (M14) • Printer control board (PRCB)
• Remedy: 1 Perform image troubleshooting procedure if image density is low. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Check the motor connector for proper connection and correct as necessary. 5 Check the connector of M9, M10, M11, M13, M14 for proper drive coupling and correct as necessary. 6 M9, M10, M11 operation check (At this time, IU must be non-installation.) M9: PRCB CN3-1 to 4 M10: PRCB CN3-5 to 8 M11: PRCB CN3-9 to 12 23 to 24-C. 7 M13, M14 operation check M13: PRCB CN4-1 to 4 M14: PRCB CN4-5 to 8 3-K. 8 Replace M9, M10, M11, M13, M14. 9 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 10 Replace imaging unit. 11 PRCB ICP23 or ICP24 conduction check. 12 Replace PRCB.

• Code: C2552
• Description: Abnormally high toner density detected cyan TCR sensor
  TC ratio in the developing unit, which is determined by toner replenishing amount control mechanism, is a predetermined value or more for a given number of times consecutively.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Toner cartridge /C • Toner cartridge /M • Toner cartridge /Y • Sub hopper unit • Printer control board (PRCB)
• Remedy: 1 Reinstall toner cartridge. 2 Reinstall imaging unit. 3 Replace imaging unit. 4 Replace PRCB. 5 Replace the sub hopper unit.

• Code: C2553
• Description: Abnormally low toner density detected magenta TCR sensor
  When sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
• Causes: • Imaging unit /C • Imaging unit /M • Imaging unit /Y • Toner cartridge /C • Toner cartridge /M • Toner cartridge /Y • Toner empty sensor/C (RS/C) • Toner empty sensor/M (RS/M) • Toner empty sensor/Y (RS/Y) • Toner supply motor/Y (M9) • Toner supply motor/M (M10) • Toner supply motor/C (M11) • Toner cartridge motor /YM (M13) • Toner cartridge motor /CK (M14) • Printer control board (PRCB)
• Remedy: 1 Perform image troubleshooting procedure if image density is low. 2 Reinstall imaging unit. 3 Reinstall toner cartridge. 4 Check the motor connector for proper connection and correct as necessary. 5 Check the connector of M9, M10, M11, M13, M14 for proper drive coupling and correct as necessary. 6 M9, M10, M11 operation check (At this time, IU must be non-installation.) M9: PRCB CN3-1 to 4 M10: PRCB CN3-5 to 8 M11: PRCB CN3-9 to 12 23 to 24-C. 7 M13, M14 operation check M13: PRCB CN4-1 to 4 M14: PRCB CN4-5 to 8 3-K. 8 Replace M9, M10, M11, M13, M14. 9 If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them. 10 Replace imaging unit. 11 PRCB ICP23 or ICP24 conduction check. 12 Replace PRCB.