• Code: E020-0001
• Description: Error in Developing Toner Sensor connection detection
  The connection detection port was OFF at power-on.
• Remedy: 1. Check the connection of the Developing Toner Sensor (TS1). Sensor side: J2133, J3089 (relay), PCB side: J3088 (relay), J114 (Main Driver PCB (PCB2)) 2. Replace the Developing Toner Sensor (TS1). 3. Replace the Main Driver PCB (PCB2). 4. Replace the DC Controller PCB (PCB1).

• Code: E020-0002
• Description: Error in Buffer Toner Sensor connection detection
  The connection detection port was OFF at power-on.
• Remedy: 1. Check the connection of the Buffer Toner Sensor (TS3). Sensor side: J2039, J3124 (relay), J3090 (relay) PCB side: J3091(relay), J115 (Main Driver PCB (PCB2)) 2. Replace the Buffer Toner Sensor (TS3). 3. Replace the Main Driver PCB (PCB2). 4. Replace the DC Controller PCB (PCB1).

• Code: E020-0003
• Description: Error in the Toner Excess Supply Sensor connection detection
  The connection detection port was OFF at power-on.
• Remedy: 1. Check the connection of the Toner Excess Supply Sensor (TS2). Sensor side: J2038, J3124 (relay), J3090 (relay) PCB side: J3091(relay), J115 (Main Driver PCB (PCB2)) 2. Replace the Toner Excess Supply Sensor (TS2). 3. Replace the Main Driver PCB (PCB2). 4. Replace the DC Controller PCB (PCB1).

• Code: E020-0004
• Description: Error in Magnet Roller Clutch connection detection
  The connection detection port was OFF at power-on.
• Remedy: 1. Check the connection of the Magnet Roller Clutch (CL5). Sensor side: J2036, J3124 (relay), J3090 (relay) PCB side: J3091(relay), J115 (Main Driver PCB (PCB2)) 2. Replace the Magnet Roller Clutch (CL5). 3. Replace the Main Driver PCB (PCB2). 4. Replace the DC Controller PCB (PCB1).

• Code: E020-0021
• Description: Error in Developing Assembly Toner Sensor Cleaning Scraper displacement
  State with toner was detected continuously.
• Remedy: 1. Turn OFF the main power. 2. Replace the Developing Assembly. 3. Turn ON the main power.

• Code: E023-0001
• Description: Developing Motor error
  Lock error of the Developing Motor (M2).
• Remedy: 1. Check the connection of the Connector. Motor side: J2319, Main Driver PCB (PCB2) side: J109 2. Check the voltage of the Developing Motor (M2) J2152. If voltage is 0V, check the connection of the Relay PCB J520. 3. Check the load of the Developing Motor (M2). Manually turn the Developing Motor (M2) located at the rear of the host machine to check it. 4. Replace the Developing Motor (M2). 5. Replace the Developing Clutch (CL1). (When an error occurs while the Developing Clutch is ON.) 6. Replace the Main Driver PCB (PCB2). 7. Replace the DC Controller PCB (PCB1).

• Code: E023-0002
• Description: Error in Magnet Roller Clutch connection detection
  Connection of the Magnet Roller Clutch (CL5) cannot be detected 5 times with 20 msec time interval.
• Remedy: 1. Check the connection of the Magnet Roller Clutch (CL5). Sensor side: J2006, Main Driver PCB (PCB2) side: J109 2. Replace the Magnet Roller Clutch (CL5). 3. Replace the Main Driver PCB (PCB2). 4. Replace the DC Controller PCB (PCB1).

• Code: E025-0001
• Description: Toner Feed Motor error
  Overcurrent of the Toner Feed Motor (M28) was detected.
• Remedy: 1. Check the connection of the Connector. Motor side: J2036, Buffer Unit relay: J3124, Front side relay: J3090, Rear side relay: J3091, Main Driver PCB (PCB2) side: J115 2. Replace the Toner Feed Motor (M28). 3. Check if toner is clogged inside of the Buffer. Turn the Drive Shaft of the Motor with your hand to check it. If the load is too much, inside of the Buffer may be clogged, so clean inside of it. 4. Replace the Main Driver PCB (PCB2). 5. Replace the DC Controller PCB (PCB1).