• Code: E012-0503
• Description: ITB Drive Roller Speed Detection PCB 2 signal error. The signal is not detected for 80msec or more.
• Remedy: 1. Check the connection of the ITB Drive Roller Speed Detection PCB 2 (UN17). Sensor side: J7318, J7319, J8047 PCB side: J1912 2. Take out the ITB Drive Roller Speed Detection PCB 2 (UN17) to clean. 4. Replace the ITB Drive Roller Speed Detection PCB 2 (UN17). 5. Check if the Harness of the ITB Drive Roller Speed Detection PCB 2 (UN17) is faulty. (Replace the Harness if it's disconnected.) 6. Replace the Drum ITB Driver PCB (UN6).

• Code: E012-0504
• Description: ITB Drive Roller Speed Detection PCB Encoder Wheel error. This error occurs when the Drum Speed Detection PCB (Bk) Encoder Wheel error is detected.
• Remedy: 1. Take out the ITB Drive Roller Speed Detection PCB to clean the ITB Drive Roller Speed Detection PCB 1/2 (UN16/17) and Encoder Wheel. 2. Replace the Encoder Wheel. 3. Replace the ITB Drive Roller Speed Detection PCB 1/2 (UN16/17). 4. Replace the Drum ITB Driver PCB (UN6).

• Code: E012-0505
• Description: ITB Drive Motor control error. Unstable rotation of the ITB Drive Motor
• Remedy: 1. Check the connection between the Drum Motor and Drum ITB Driver PCB (UN6). Sensor side: J7300, J8019 PCB side: J1920 2. Check the ITB. Check to see if the ITB is displaced or ripped. Refer to E075 if the ITB is displaced. 3. Replace the ITB Cleaning Blade. 4. Replace the Drum ITB Driver PCB (UN6).

• Code: E012-0506
• Description: ITB Drive Motor rotation error. ITB Drive Motor is not rotating at the specified speed, or it is stopped.
• Remedy: 1. Check the connection between the ITB Drive Motor and Drum ITB Driver PCB (UN6). Sensor side: J7518, J8047, J8050 PCB side: J1912, J8011 2. Check the ITB. Check to see if the ITB is displaced or ripped. Refer to E075 if the ITB is displaced. 3. Replace the ITB Cleaning Blade. 4. Replace the Drum ITB Driver PCB (UN6).

• Code: E012-2000
• Description: Rotation error of Drum Motor (Y/M/C/Bk) (M21/23/25/19) and ITB Drive Motor. Simultaneous rotation error in all Motors
• Remedy: 1. Check the connection of the Drum ITB Driver PCB. PCB side: J1900 (J1920/J1921/J1912) 2. Check the connection of the Relay PCB. PCB side: J1805 3. Check the Interlock Switch. 4. Check if the Harness of the Drum ITB Driver PCB (UN6) is faulty.

• Code: E012-3000
• Description: Error in Drum Speed Detection PCB (UN18 to 25) of all colors. This error occurs when the Drum Speed Detection PCB (UN18 to 25) error is detected for all colors simultaneously.
• Remedy: 1. Check the connection of the Drum ITB Driver PCB. PCB side: J1900 (J1310 to J1317) 2. Check if the Harness of the Drum ITB Driver PCB (UN6) is faulty. 3. Replace the Drum ITB Driver PCB (UN6).

• Code: E012-3001
• Description: Control error of Drum Motor (Y/M/C/Bk) (M21/23/25/19). This error occurs when the Drum Motor (Y/M/C/Bk) (M21/23/25/19) control error is detected for all colors simultaneously.
• Remedy: 1. Check the Process Unit (to see if the Connector is physically removed). 2. Check the Drum Unit (to see if the Connector is physically removed).

• Code: E012-3002
• Description: Rotation error of Drum Motor (Y/M/C/Bk) (M21/23/25/19). All of the Drum Motors (Y/M/C/Bk) (M21/23/25/19) are not rotating at the specified speed, or they are stopped.
• Remedy: 1. Check the connector of the Drum ITB Driver PCB (UN6). PCB side: J1900 (J1920/J1921/J1912)