• Code: C-4709
• Description: Memory time out. • The expansion processing from the memory to the page memory does not terminate. • The compression processing from the page memory to the memory does not terminate. • The development from the memory to the page memory does not terminate. • The transmission of the compressed data from memory to memory does not terminated.
• Causes: Overall control board (OACB) Printer control board (PRCB) Image processing board (IPB)
• Remedy: 1 Check the connector connection and the wiring on IPB and OACB, and repair it if any abnormality. - 2 Check the connector connection and the wiring on PRCB, and repair it if any abnormality. - 3 Check the connector connection and the wiring between IPB and OACB/between OACB and PRCB, and repair it if any abnormality. - 4 Rewrite the firmware for image control. - 5 Replace IPB. - 6 Replace OACB. - 7 Replace PRCB.

• Code: C-4720
• Description: Shift amount abnormality while in the repeat. When the shift amount (used for cutting margin, etc.) while in the repeat is negative (-).
• Causes: Image processing board (IPB)
• Remedy: 1 Check the connector connection and the wiring on IPB, and repair it if any abnormality. - 2 Rewrite the firmware for image control. - 3 Replace IPB.

• Code: C-4721
• Description: The centering adjustment is too late. The print operation starts before the paper centering adjustment is terminated. (The centering adjustment is too late.)
• Causes: Original skew sensor /Fr (PS65) Original skew sensor /Rr (PS66) Printer control board (PRCB) ADU drive board (ADUDB)
• Remedy: 1 Check the connector connection and the wiring on IPB and PECB, and repair it if any abnormality. - 2 Check the connector connection and the wiring between ADUCB and the sensor, and repair it if any abnormality. - 3 Check I/O and the operation of the sensor, and repair/replace it if any abnormality. 18-L 4 Replace PS65 or PS66. - 5 Replace PRCB. - 6 Replace ADUDB.

• Code: C-4722
• Description: The creation of the PWM gamma curve failed. A PWM gamma curve is not created properly.
• Causes: Toner control board (TCB) Printer control board (PRCB)
• Remedy: 1 Check TCB, and clean it with alcohol if there is IDC sensor dirt or any abnormality. Be sure to clean TCB with alcohol, otherwise replacement of TCB is required. - 2 Check the developing section, and clean/repair it if there is sensor dirt or any abnormality. - 3 Check the connector connection and the wiring between PRCB and TCB, and repair it if any abnormality. - 4 Replace TCB. - 5 Replace PRCB.

• Code: C-4725
• Description: LPH drive board (LPHB) connection abnormality. Due to the disconnection of the LPHB connector, no connection is available with the overall control board.
• Causes: LPH board (LPHB) Relay board /A (RBA) Image processing board (IPB)
• Remedy: 1 Check the connector connection and the wiring between LPHB and RBA, and repair it if any abnormality. - 2 Check the connector connection and the wiring between IPB and RBA, and repair it if any abnormality. - 3 Check LPHB, and repair/replace it if any abnormality. 18-C 4 Rewrite the firmware for image control. - 5 Replace LPHB. - 6 Replace RBA. - 7 Replace IPB.

• Code: C-4850
• Description: Segmentation abnormality. The overall control software accesses an illegal address.
• Causes: Image processing board (IPB)
• Remedy: 1 Check the connector connection and the wiring on IPB, and repair it if any abnormality. - 2 Rewrite the firmware for image control. - 3 Replace IPB.

• Code: C-5010
• Description: Communication error between the overall control board (OACB) and the printer control board (PRCB). Any of the following error is detected during data reception between OACB and PRCB. • Data head error • Data check sum error • Undefined command reception error • Occurrence of communication GA error vector
• Causes: Printer control board (PRCB) Overall control board (OACB)
• Remedy: 1 After turning OFF the sub power switch, turn OFF the main power switch and unplug the power plug. Restart the main body after 10 seconds. - 2 Check the connector connection and the wiring on OACB, and repair it if any abnormality. - 3 Check the connector connection and the wiring on PRCB, and repair it if any abnormality. - 4 Check the connector connection and the wiring between OACB and PRCB, and repair it if any abnormality. - 5 Replace OACB. - 6 Replace PRCB.

• Code: C-5101
• Description: Fusing motor (M1) speed abnormality. An error detection signal is detected twice in succession within a specified period of time after M1 was turned ON.
• Causes: Fusing motor (M1) Printer control board (PRCB)
• Remedy: 1 Check the fusing drive section, and repair it if any abnormality. - 2 Check the connector connection and the wiring between PRCB and the motor, and repair it if any abnormality. - 3 Check the I/O drive of the motor and the coupling of the gear, and repair/replace it if any abnormality. 17-K 4 Replace M1. - 5 Replace PRCB.