• Code: C3B02
• Description: IH malfunction (CPU)
  A failure in communication with the fusing CPU continues for a predetermined period of time.
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHC, IHPU, IHMEB and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit. 5 Replace IHC. 6 Replace IHPU. 7 Replace IHMEB. 8 Replace PRCB.

• Code: C3B03
• Description: IH malfunction (monitor)
  Though the IH heater is OFF, mechanically, the ON status is detected. (Malfunction of IH heater operation)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the upper right door. 3 Check the fusing unit, IHC, IHPU, IHMEB and PRCB for proper connection and correct or change as necessary. 4 Replace the fusing unit. 5 Replace IHC. 6 Replace IHPU. 7 Replace IHMEB. 8 Replace PRCB.

• Code: C3B07
• Description: IH input power error
  • While the IH heater was ON, input power stayed at the high voltage power detection value or over for more than the predetermined period of time. • While the IH heater was ON, input power was at the low power detection value or under for more than the predetermined period of time. • While the IH heater was ON, input power was at the high voltage detection value or over for more than the predetermined period of time. • While the IH heater was ON, input power was below the low voltage detection value or under for more than the predetermined period of time. • While the IH heater was ON, inverter power stayed at the upper limit value or over for more than the predetermined period of time. • While the IH heater was ON, output voltage halt was detected.
• Remedy: 1 Check the connection of the fusing unit. 2 Check the fusing unit, IHC, IHPU and PRCB for proper connection and correct or change as necessary. 3 Replace IHC. 4 Replace IHPU. 5 Replace PRCB.

• Code: C3B08
• Description: IH input voltage error
  • While the IH heater was ON, input power was at the high voltage detection value or over for more than the predetermined period of time. • While the IH heater was ON, input voltage was at the low power detection value or under for more than the predetermined period of time.
• Remedy: 1 Check the connection of the fusing unit. 2 Check the fusing unit, IHC, IHPU and PRCB for proper connection and correct or change as necessary. 3 Replace IHC. 4 Replace IHPU. 5 Replace PRCB.

• Code: C4101
• Description: Polygon motor rotation trouble
  • The polygon motor fails to turn stably even after the lapse of a given period of time after activating and changing rotation speed the polygon motor. • Motor lock signal detects HIGH for a given period time consecutively during the polygon motor is rotating.
• Remedy: 1 Check the connector between PH unit-FRB CN17 for proper connection and correct as necessary. 2 Replace the PH unit. 3 FRB fuse conduction check. 4 Replace FRB. 5 Replace PRCB.

• Code: C4501
• Description: Laser malfunction
  • SOS signal is not detected even after the lapse of a given period of time after starting the laser output. • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Remedy: 1 Check the connector between PH unit-relay CN64- PRCB CN24 for proper connection and correct as necessary. 2 Replace the PH unit. 3 Replace PRCB.

• Code: C4801
• Description: Main unit board failure
  MFP detects simultaneous replacement of multiple boards.
• Remedy: 1 Reinstall the old PRCB. 2 Back up data. 2.1. Call the Service Mode to the screen. 2.2. Call the Enhanced Security to the screen. 2.3. Touch [Engine Data Backup]. 2.4. Touch [Engine Data Save mode], and press the Start key. 2.5. Select [Yes], and press the Start key again. 2.6. Check that the result “OK” appears. 3 Replace PRCB Turn OFF the main power switch and replace the current PRCB with a new one. (When using a PRCB of another machine in service, be sure to use a PRCB installed in the same model.) 4 Restore back up data. 4.1. Turn ON the main power switch. 4.2. Check that the trouble code “C4802” appears and then display service mode. 4.3. Call the Enhanced Security to the screen. 4.4. Touch [Engine Data Backup]. 4.5. Touch [Engine Data Load mode], and press the Start key. 4.6. Select [Yes], and press the Start key again. 4.7. Check that the result “OK” appears. 4.8. Turn OFF the main power switch and turn it ON again more than 10 seconds after. 5 Update the PRCB firmware. 6 If the above actions do not solve the problem, contact KMBT.

• Code: C4802
• Description: Main unit backup data miscompare
  The replacement of the printer control board is detected.
• Remedy: 1 1.1. Check that the trouble code “C4802” appears and then display service mode. 1.2. Call the Enhanced Security to the screen. 1.3. Touch [Engine Data Backup]. 1.4. Touch [Engine Data Load mode], and press the Start key. 1.5. Select [Yes], and press the Start key again. 1.6. Check that the result “OK” appears. 1.7. Turn OFF the main power switch and turn it ON again more than 10 seconds after. 2 Update the PRCB firmware. 3 If the above actions do not solve the problem, contact KMBT.