• Code: 020-0001-05
• Description: Error in Developing Toner Sensor connection detection
• Causes: The connection detection port was OFF at power-on.
• Remedy: [Related parts] - Harnesses from the main Driver PCB to the Developing Toner Sensor 1. Main Driver PCB (UN78/J114) to Relay Connector (31P) (Unit of replacement: CABLE, MAIN DRIVER, REAR UPPER) 2. Relay Connector (31P) to Relay Connector (25P) (Unit of replacement: CABLE, RELAY, FRONT) 3. Relay Connector (25P) to Developing Toner Sensor (TS01/J2133) (Unit of replacement: CABLE, MAIN DRIVER, FRONT) - Developing Toner Sensor (TS01) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 020-0002-05
• Description: Error in Buffer Toner Sensor connection detection
• Causes: The connection detection port was OFF at power-on.
• Remedy: [Related parts] - Harnesses from the Main Driver PCB to the Buffer Unit 1. Main Driver PCB (UN78/J115) to Relay Connector (21P) (Unit of replacement: CABLE, MAIN DRIVER, REAR UPPER) 2. Relay Harness (21P) (Unit of replacement: CABLE, RELAY, FRONT) 3. Relay Connector (21P) to Buffer Unit (J3124) (Unit of replacement: CABLE, MAIN DRIVER, FRONT) - Harness between the Buffer Unit (J3124) to the Buffer Toner Sensor 2 (TS03/J2039) (Unit of replacement: CABLE, BUFFER) - Buffer Toner Sensor 2 (TS03) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 020-0003-05
• Description: Error in the Toner Excess Supply Sensor connection detection
• Causes: The connection detection port was OFF at power-on.
• Remedy: [Related parts] - Harnesses from the Main Driver PCB to the Buffer Unit 1. Main Driver PCB (UN78/J115) to Relay Connector (21P) (Unit of replacement: CABLE, MAIN DRIVER, REAR UPPER) 2. Relay Harness (21P) (Unit of replacement: CABLE, RELAY, FRONT) 3. Relay Connector (21P) to Buffer Unit (J3124) (Unit of replacement: CABLE, MAIN DRIVER, FRONT) - Harness between the Buffer Unit (J3124) and the Toner Excess Supply Sensor (TS02/J2038) (Unit of replacement: CABLE, BUFFER) - Toner Excess Supply Sensor (TS02) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 020-0004-05
• Description: Error in Developing Buffer Clutch connection detection
• Causes: The connection detection port was OFF at power-on.
• Remedy: [Related parts] - Harnesses from the Main Driver PCB to the Buffer Unit 1. Main Driver PCB (UN78/J115) to Relay Connector (21P) (Unit of replacement: CABLE, MAIN DRIVER, REAR UPPER) 2. Relay Harness (21P) (Unit of replacement: CABLE, RELAY, FRONT) 3. Relay Connector (21P) to Buffer Unit (J3124) (Unit of replacement: CABLE, MAIN DRIVER, FRONT) - Harness between the Buffer Unit (J3124) and the Magnet Roller Clutch (CL05/J2036) (Unit of replacement: CABLE, BUFFER) - Magnet Roller Clutch (CL05) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 020-0020-05
• Description: Developing Toner Sensor Cleaning Scraper error
• Causes: Disengagement of the Developing Toner Sensor Cleaning Scraper was detected.
• Remedy: Replace the Developing Assembly.

• Code: 020-0021-05
• Description: Developing Toner Sensor Cleaning Scraper error
• Causes: It was detected that the Developing Toner Sensor Cleaning Scraper was being bent.
• Remedy: Replace the Developing Assembly.

• Code: 023-0001-05
• Description: Developing Motor error
• Causes: Lock error of the Developing Motor was detected.
• Remedy: [Related parts] - Harness connecting from the Main Driver PCB (UN78/J109) to the Developing Motor (M02/J2139) and Developing Clutch (CL01/J2006) (Unit of replacement: CABLE, MAIN, REAR UPPER) - Harnesses from the Relay PCB to the Developing Motor 1. Relay PCB (UN86/J520) to Relay Connector (5P) (Unit of replacement: CABLE, SIGNAL) 2. Relay Connector (5P) to Developing Motor (M02/J2152) (Unit of replacement: CABLE, MAIN, REAR UPPER) - Developing Motor (M02) - Developing Clutch (CL01) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - Relay PCB (UN86) (Unit of replacement: RELAY PCB ASSEMBLY) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES

• Code: 023-0002-05
• Description: Error in Developing Clutch connection detection
• Causes: Connection of the Developing Clutch cannot be detected.
• Remedy: [Related parts] - Harness between the Main Driver PCB (UN78/J109) and the Developing Clutch (CL01/J2006) (Unit of replacement: CABLE, MAIN, REAR UPPER) - Harness between the Main Driver PCB (UN78/J101) and the Relay PCB (UN86/J515) (Unit of replacement: CABLE, SIGNAL) - Harness between the Relay PCB (UN86/J513) and the DC Power Supply PCB (24V) (J202B) (Unit of replacement: CABLE, DC 24V, B) - Developing Clutch (CL01) - Main Driver PCB (UN78) (Unit of replacement: MAIN DRIVE DRIVER PCB ASS'Y) - Relay PCB (UN86) (Unit of replacement: RELAY PCB ASSEMBLY) - DC Power Supply PCB (24V) (Unit of replacement: 24V POWER SUPPLY ASS'Y, RIGHT) - DC Controller PCB (UN01) (Unit of replacement: DC CONTROLLER PCB ASS'Y) [Remedy] Check/replace the related harness/cable, connector and parts. [Reference] Before replacing the DC Controller PCB, back up the service mode data (approx. 2 min) and restore the backup data after the replacement so the data may be able to be protected. - Backup: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMBUP - Restoration: COPIER (LEVEL2)> FUNCTION> SYSTEM> DSRAMRES