• Code: E020-0021
• Description: Error in Y Developing Assembly
  Patch level is lower than the target lower limit although the patch level was maximized at the time of patch initialization.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first if P-LED-DA is 3F or more. If the Patch Sensor (UN47, UN48,UN49) value shows 1-digit, check that the Developing Assembly is installed, and then perform remedy from 3. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor Window. 3. Replace the Patch Sensor. 4. Replace the Drum.

• Code: E020-0022
• Description: Error in M Developing Assembly
  Patch level is lower than the target lower limit although the patch level was maximized at the time of patch initialization.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first if P-LED-DA is 3F or more. If the Patch Sensor (UN47, UN48,UN49) value shows 1-digit, check that the Developing Assembly is installed, and then perform remedy from 3. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor Window. 3. Replace the Patch Sensor. 4. Replace the Drum.

• Code: E020-0023
• Description: Error in C Developing Assembly
  Patch level is lower than the target lower limit although the patch level was maximized at the time of patch initialization.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first if P-LED-DA is 3F or more. If the Patch Sensor (UN47, UN48,UN49) value shows 1-digit, check that the Developing Assembly is installed, and then perform remedy from 3. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor Window. 3. Replace the Patch Sensor. 4. Replace the Drum.

• Code: E020-0024
• Description: Error in Bk Developing Assembly
  Patch level is lower than the target lower limit although the patch level was maximized at the time of patch initialization.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first if P-LED-DA is 3F or more. If the Patch Sensor (UN47, UN48,UN49) value shows 1-digit, check that the Developing Assembly is installed, and then perform remedy from 3. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor Window. 3. Replace the Patch Sensor. 4. Replace the Drum

• Code: E020-0101
• Description: Error in Y Developing Assembly
  The value is higher than the upper limit for the patch.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first If P-LED-DA is 3F or more. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor (UN47,UN48,UN49) Window. 3. Check if the patch sensor is disconnected. 4. Replace the Patch Sensor. 5. Replace the Drum.

• Code: E020-0102
• Description: Error in M Developing Assembly
  The value is higher than the upper limit for the patch.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first If P-LED-DA is 3F or more. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor (UN47,UN48,UN49) Window. 3. Check if the patch sensor is disconnected. 4. Replace the Patch Sensor. 5. Replace the Drum.

• Code: E020-0103
• Description: Error in C Developing Assembly
  The value is higher than the upper limit for the patch.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first If P-LED-DA is 3F or more. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor (UN47,UN48,UN49) Window. 3. Check if the patch sensor is disconnected. 4. Replace the Patch Sensor. 5. Replace the Drum.

• Code: E020-0104
• Description: Error in Bk Developing Assembly
  The value is higher than the upper limit for the patch.
• Remedy: Go through the following: DISPLAY > P-LED-DA; perform cleaning first If P-LED-DA is 3F or more. 1. Check installation of the Developing Assembly and the Drum. 2. Clean the Patch Sensor (UN47,UN48,UN49) Window. 3. Check if the patch sensor is disconnected. 4. Replace the Patch Sensor. 5. Replace the Drum.