• Code: 302
• Description: Charge roller current leak A charge roller current leak signal is detected.
• Causes: • Cartridge (charge roller) defective • High voltage supply board defective • Poor cartridge connection

• Code: 320
• Description: Polygon motor error The polygon motor does not reach its operating speed within 10 seconds after the polygon motor on signal, or the lock signal is not detected for more than a certain time during operation.
• Causes: • Polygon motor • Polygon motor cable

• Code: 322
• Description: 1st laser synchronization error The laser synchronization detector cannot detect the laser synchronization signal for more than 5 consecutive 100 ms intervals.
• Causes: • Laser synchronization detector board out of position • Laser synchronization detector board or cable defective • Laser synchronization mirror out of position • LD unit defective • Engine board defective

• Code: 323
• Description: LD drive current exceeded The LD driver detects this error for more than 500 ms.
• Causes: • LD unit defective

• Code: 326
• Description: 2nd laser synchronization error The 1st LD1 is already on, but the laser synchronization detector cannot detect the laser synchronization signal from the 2nd LD for more than 5 consecutive 100 ms intervals.
• Causes: • Laser synchronization detector board out of position • LD unit defective • Engine board defective

• Code: 391
• Description: Development bias leak A development bias leak signal is detected.
• Causes: • High voltage supply board defective • Poor cartridge connection

• Code: 500
• Description: Main motor lock A main motor lock signal is not detected for more than 700 ms after the main motor starts to rotate, or the lock signal is not detected for more than a certain time during rotation after the last signal.
• Causes: • Main motor defective • Too much load on the drive mechanism

• Code: 541
• Description: Unstable fusing temperature During warm-up, the fusing temperature rises by less than 20 °C during 11 seconds. The fusing temperature detected by the thermistor was 0 °C 5 seconds after the fusing relay was turned on.
• Causes: • Thermistor defective • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit