• Code: 020-0434-05
• Description: ATR output error
• Causes: The ATR Patch (Bk) detected that the output value (SigD) exceeded the upper limit at initialization of the Developing Assembly.
• Remedy: - Drum Unit - Developing Assembly (Bk) [Remedy] Perform the following in the order while checking whether the error is cleared. 1. Check that the Developing Assembly and the Drum Unit are properly installed. 2. Remove soiling on the Drum Unit. 3. Replace the Developing Assembly and the Drum Unit.

• Code: 020-04A8-05
• Description: ATR output error
• Causes: The ATR Sensor (Bk) detected that the output value was below the lower limit during printing.
• Remedy: - Harnesses connecting the Process Unit Relay PCB (UN20/J609), the Relay Connector (J5096/5P) and the ATR Sensor (Bk) (TS8/J6120) - Developing Assembly (Bk) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 020-04A9-05
• Description: ATR output error
• Causes: The ATR Sensor (Bk) detected that the output value exceeded the upper limit during printing.
• Remedy: - Harnesses connecting the Process Unit Relay PCB (UN20/J609), the Relay Connector (J5096/5P) and the ATR Sensor (Bk) (TS8/J6120) - Developing Assembly (Bk) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 020-04B8-05
• Description: ATR output error
• Causes: The ATR Sensor (Bk) detected a control voltage less than 2.5 V at initialization of the Developing Assembly.
• Remedy: - Harnesses connecting the Process Unit Relay PCB (UN20/J609), the Relay Connector (J5096/5P) and the ATR Sensor (Bk) (TS8/J6120) - Developing Assembly (Bk) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 020-04B9-05
• Description: ATR output error
• Causes: The ATR Sensor (Bk) detected 4.5 V or more of control voltage at initialization of the Developing Assembly.
• Remedy: - Harnesses connecting the Process Unit Relay PCB (UN20/J609), the Relay Connector (J5096/5P) and the ATR Sensor (Bk) (TS8/J6120) - Developing Assembly (Bk) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 021-0100-05
• Description: Developing Motor error
• Causes: Lock signal error of the Developing Motor (Y) was detected consecutively.
• Remedy: - Harness between the Feed/Drum Driver PCB (UN2/J225) and the Developing Motor (Y) (M5/ J6015) - Developing Motor (Y) (M5) - Developing Assembly (Y) - Feed/Drum Driver PCB (UN2) [Remedy] Perform the following in the order while checking whether the error is cleared. 1. Turn the gears of the Developing Assembly by hand. If it does not turn, replace the Developing Assembly. 2. Check/replace the related harness/cable, connector and parts.

• Code: 021-0120-05
• Description: Developing Screw rotation detection error
• Causes: The difference between the maximum and the minimum of sampling values detected by the ATR Sensor (Y) in the Developing Assembly (Y) was 12 or less during rotation of the Developing Screw.
• Remedy: - Harness between the Feed/Drum Driver PCB (UN2/J225) and the Developing Motor (Y) (M5/ J6015) - Harnesses connecting the Front Driver PCB (UN3/J306), the Drawer Unit (J755) and the Process Unit Relay PCB (UN20/J607) - Harnesses connecting the Process Unit Relay PCB (UN20/J609), the Relay Connector (J5093/5P) and the ATR Sensor (Y) (TS5/J6114) - Developing Motor (Y) (M5) - Developing Assembly (Y) - Feed/Drum Driver PCB (UN2) [Remedy] Check/replace the related harness/cable, connector and parts.

• Code: 021-0200-05
• Description: Developing Motor error
• Causes: Lock signal error of the Developing Motor (M) was detected consecutively.
• Remedy: - Harness between the Feed/Drum Driver PCB (UN2/J225) and the Developing Motor (M) (M6/ J6013) - Developing Motor (M) (M6) - Developing Assembly (M) - Feed/Drum Driver PCB (UN2) [Remedy] Perform the following in the order while checking whether the error is cleared. 1. Turn the gears of the Developing Assembly by hand. If it does not turn, replace the Developing Assembly. 2. Check/replace the related harness/cable, connector and parts.