• Code: C2561, C2562, C2563, C2564
• Description: • C2561: Cyan TCR sensor failure • C2562: Magenta TCR sensor failure • C2563: Yellow TCR sensor failure • C2564: Black TCR sensor failure TCR sensor automatic adjustment does not function properly, failing to adjust to an appropriate value.
• Causes: • Imaging unit/Y,M,C,K • MFP board (MFPB)
• Remedy: 1. Reinstall imaging unit. 2. Check the connector between imaging unit-MFPB CN19E, CN20E for proper connection and correct as necessary. 3. Replace the imaging unit. 4. Replace MFPB.

• Code: C2650, C265B
• Description: • C2650: Main backup media access error 1 • C265B: Main backup media access error 2. Trouble detection condition • When an error is detected at the data reading process. • The re-written data, which has been read out, checked and founded as error, is read out again and found as error. • The error was found when reading out the counter value. • The main body detects that the EEPROM is not mounted.
• Causes: • MFP board (MFPB) • C2650: EEPROM/1 (EEPROM/1) • C265B: EEPROM/2 (EEPROM/2)
• Remedy: 1. Make sure that EEPROM/1 and EEPROM/2 are mounted in their respective correct positions. 2. Check to see if the EEPROM is mounted in a reverse direction. 3. Check the harness from MFPB to EEPROM for proper connection and correct as necessary. 4. Replace MFPB. 5. Replace EEPROM/1 and EEPROM/2. NOTE • To replace EEPROM/2 with a new one, contact KM. 1. Replace the current EEPROM with a new one. 2. Replace the following components with new ones. When the transfer belt unit and the fusing unit have been replaced with new ones, perform [New Release] in the service mode. When the transfer roller has been replaced with a new one, perform [Counter clear]. • Imaging unit/Y,M,C,K • Transfer belt unit • Fusing unit • Transfer roller • Feed roller, separation roller (including options) • Toner filter 3. Turn ON the main power switch and check to see that warm-up is started. Make sure that malfunction codes other than C2650 or improper IU/TC placement is not detected. 4. Make the specified readjustments. 6. If the above actions do not solve the problem, contact KM.

• Code: C265A
• Description: Main backup media wrongly installation. The EEPROM/1 and EEPROM/2 are mounted in a reverse direction.
• Causes: • EEPROM/1 (EEPROM/1) • EEPROM/2 (EEPROM/2) • MFP board (MFPB)
• Remedy: 1. Check to see if the EEPROM/1 and EEPROM/2 are mounted in a reverse direction. 2. Check the type of the installed EEPROM and replace it if it is a wrong one. 3. Replace EEPROM/1 and EEPROM/2. NOTE • To replace EEPROM/2 with a new one, contact KM. 4. Replace MFPB.

• Code: C2A21, C2A22, C2A23, C2A24
• Description: • C2A21: Toner cartridge/C new release failure • C2A22: Toner cartridge/M new release failure • C2A23: Toner cartridge/Y new release failure • C2A24: Toner cartridge/K new release failure. Trouble detection condition The status with the new cartridge is not cleared after the new toner cartridge is set.
• Causes: • Toner cartridge/Y,M,C,K • MFP board (MFPB)
• Remedy: 1. Reinstall the toner cartridge 2. Clean the connection between the toner cartridge and the machine if dirty. 3. Check the connector between the toner cartridge-MFPB CN18E for proper connection and correct as necessary. 4. Replace the toner cartridge 5. Replace MFPB.

• Code: C3201
• Description: Fusing motor failure to turn. The motor lock signal remains HIGH for a predetermined continuous period of time while the motor is turning.
• Causes: • Fusing motor (M2) • MFP board (MFPB)
• Remedy: 1. Check the connector between M2-MFPB CN6E for proper connection and correct as necessary. 2. Check the loading status of the fusing unit drive, and correct the error as necessary. 3. M2 operation check • Control signal: MFPB CN6E-11 to 14 • Location of electrical component: 2-C 4. Replace M2. 5. MFPB F9E conduction check 6. Replace MFPB.

• Code: C3202
• Description: Fusing motor turning at abnormal timing. The motor lock signal remains LOW for a predetermined continuous period of time while the motor remains stationary.
• Causes: • Fusing motor (M2) • MFP board (MFPB)
• Remedy: 1. Check the connector between M2-MFPB CN6E for proper connection and correct as necessary. 2. Check the loading status of the fusing unit drive, and correct the error as necessary. 3. M2 operation check • Control signal: MFPB CN6E-11 to 14 • Location of electrical component: 2-C 4. Replace M2. 5. MFPB F9E conduction check 6. Replace MFPB.

• Code: C3302
• Description: Paper cooling fan motor malfunction. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Paper cooling fan motor (FM4) • MFP board (MFPB)
• Remedy: 1. Check the connector between FM4-relay CN82-MFPB CN9E for proper connection and correct as necessary. 2. Check the fan for possible overload and correct as necessary. 3. FM4 operation check • Control signal: MFPB CN9E-6 (LOCK) • Location of electrical component: 3-C 4. Replace FM4. (bizhub C3851/C3351 / bizhub C3851FS) 5. MFPB F2E conduction check 6. Replace MFPB.

• Code: C3421
• Description: Fusing temperature increase malfunction (TEM1: center) • Detected temperature of the fusing temperature sensor/1 (TEM1: center and edge) does not go up a given range of temperature even after a lapse of given period of time at warm up. • The warm-up is not completed even after the set period of time has elapsed after the warm-up is started.
• Causes: • Fusing unit • C3421: Fusing temperature sensor/1 (TEM1: center) • C3426: Fusing temperature sensor/1 (TEM1: edge) • DC power supply (DCPS) • MFP board (MFPB)
• Remedy: 1. Check the fusing unit for correct installation (whether it is secured in position). 2. Check the open/close operation of the right door. 3. Check the fusing unit-MFPB CN13E, DCPS CN2 for proper connection and correct as necessary. 4. Replace the fusing unit. 5. Replace MFPB. 6. DCPS F102 conduction check 7. Replace DCPS.