• Code: E020-0390
• Description: Error in C Developing Assembly
  Error in signal lower limit with ATR sampling detected value
• Remedy: 1. Check if the ATR Sensor Connector is disconnected. 2. Check short-circuit of the ATR Sensor (TS7) Harness. 3. Replace the Developing Assembly.

• Code: E020-0391
• Description: Error in C Developing Assembly
  Error in signal upper limit with ATR sampling detected value
• Remedy: 1. Check toner leak from the Toner Buffer Unit. 2. Check toner level in the Toner Container. 3. Replace the Developing Assembly. 4. Check short-circuit of the harness with the Toner Buffer Supply Sensor (PS3).

• Code: E020-03B0
• Description: Error in C Developing Assembly
  TD ratio lower limit error at the time of print sequence (Large amount of toner in the Developing Assembly)s.
• Remedy: Go through the following: DISPLAY > DENS > DENS-C; if DENS-C is slightly higher than 5.0%, output 10 sheets of solid image with the color causing the error (to reduce T/D ratio). See the Service Mode again to see if the problem is improved. Remedy is complete if it’s improved. If not, perform the following remedy work. 1. Check if the ATR Sensor (TS7) Connector is disconnected. 2. Check short-circuit of the ATR Sensor Harness. 3. Replace the Developing Assembly.

• Code: E020-03B1
• Description: Error in C Developing Assembly
  TD ratio upper limit error at the time of print sequence (Small amount of toner in the Developing Assembly)
• Remedy: 1. Output 10 sheets of white (blank) sheets (to increase T/D ratio). 2. Check toner leak from the Toner Buffer Unit. 3. Check toner level in the Toner Container. 4. Replace the Developing Assembly. 5. Check short-circuit of the harness of the Toner supply sensor (PS3).

• Code: E020-0430
• Description: Error in Bk Developing Assembly
  The average of ATR reference value was lower than the specified value at the time of ATR Sensor initialization
• Remedy: 1. Check short-circuit of the ATR Sensor (TS8) Harness. 2. Replace the Developing Assembly.

• Code: E020-0440
• Description: Error in Bk Developing Assembly
  Unable to adjust the control voltage at the time of ATR initialization: less than the specified value (3.2V).
• Remedy: 1. Check if the ATR Sensor (TS8) Connector is properly connected. 2. Check short-circuit of the ATR Sensor Harness. 3. Replace the Developing Assembly.

• Code: E020-0441
• Description: Error in Bk Developing Assembly
  Unable to adjust the control voltage at the time of ATR initialization: exceeds the specified value (6.8V).
• Remedy: 1. Check short-circuit of the ATR Sensor (TS8) Harness. 2. Replace the Developing Assembly.

• Code: E020-0490
• Description: Error in Bk Developing Assembly
  Error in signal lower limit with ATR sampling detected value
• Remedy: 1. Check if the ATR Sensor Connector is disconnected. 2. Check short-circuit of the ATR Sensor (TS8) Harness. 3. Replace the Developing Assembly.