• Code: C0211
• Description: Bypass tray lift-up failure
  - When a print cycle is completed, a jam is fixed, or the power switch is turned ON, if the bypass lift sensor (PS4) does not change from the unblocked to blocked condition after the lapse of a given period of time after the bypass pick-up solenoid (SD1) is turned ON, the machine retries the depressing motion. This trouble code is displayed if the PS4 is not blocked after the retry
  - While the bypass lift sensor (PS4) is blocked, if the PS4 is not unblocked after the lapse of a given period of time after the bypass pick-up solenoid (SD1) is turned ON, the machine retries the lifting motion. This trouble code is displayed if the PS4 is not unblocked after the retry
• Remedy: 1 Check the connector between M1-PRCB CN6 for proper connection and correct as necessary. 2 Check M1 for correct drive coupling and correct as necessary. 3 Check the connector between PS4-relay CN6-PRCB CN8 for proper connection and correct as necessary. 4 Check the connector between SD1-relay CN4-relay CN6-PRCB CN8 for proper connection and correct as necessary. 5 PS4 I/O check, sensor check. 6 M1 operation check. 7 SD1 operation check. 8 Change PRCB.

• Code: C2351
• Description: Suction fan motor malfunction
  - The fan lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.
• Remedy: 1 Check the connector between FM5-relay CN13-PRCB CN14 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM5 operation check. 4 Change PRCB.

• Code: C2557
• Description: Abnormally low T/C ratio
  - The T/C ratios detected by the TCR sensor board (TCRSB) are below the threshold for the detection of abnormally low T/C ratio for three successive times. However, if a toner empty condition is detected, this abnormality is not detected.
• Remedy: 1 Check to see if developer is available. 2 Check the connector between TCRSBrelay CN14-PRCB CN10 for proper connection and correct as necessary. 3 Change TCRSB. 4 Execute “TCR AUTO ADJUST. 5 Change PRCB.

• Code: C2558
• Description: Abnormally high T/C ratio
  - The T/C ratios detected by the TCR sensor board (TCRSB) are above the threshold for the detection of abnormally high T/C ratio for three successive times.
  - The connector between TCRSB to PRCC is disconnected
• Remedy: 1 Check to see if developer is available. 2 Check the connector between TCRSBrelay CN14-PRCB CN10 for proper connection and correct as necessary. 3 Change TCRSB. 4 Execute “TCR AUTO ADJUST. 5 Change PRCB.

• Code: C255C
• Description: TCR sensor adjustment failure
  - When AUTO ADJUST is performed, the difference between the TCR sensor output voltage determined by TCR AUTO ADJUST and the standard voltage is greater than the given value.
• Remedy: 1 Check to see if developer is available. 2 Check the connector between TCRSBrelay CN14-PRCB CN10 for proper connection and correct as necessary. 3 Change TCRSB. 4 Execute “TCR AUTO ADJUST. 5 Change PRCB.

• Code: C2702
• Description: Abnormal image transfer voltage
  - The image transfer voltage remains more than 100 V continuously for a given period of time while the drum remains stationary.
• Remedy: 1 Check the transfer roller unit for installation. 2 Change HV1. 3 Change PRCB.
  

• Code: C3451
• Description: Warming-up failure
  - The surface temperature of the fusing roller does not reach a given level even after the lapse of a given period of time during a warm-up cycle.
• Remedy: 1 Check the fusing unit for correct installation. 2 Check the open/close operation of the right door. 3 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change PRCB. 6 Change DCPU.

• Code: C3751
• Description: Fusing failure (abnormally high fusing temperature 1)
  - The temperature detected by the thermistor/1 (TH1) remains higher than a given temperature for a given period of time.
• Remedy: 1 Check the fusing unit for correct installation. 2 Check the open/close operation of the right door. 3 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 4 Change fusing unit. 5 Change PRCB. 6 Change DCPU.