• Code: 202
• Description: Polygon motor on timeout error
  The polygon mirror motor does not reach the targeted operating speed within 10 sec. after turning.
• Causes: Polygon motor/driver board harness loose or disconnected. Polygon motor/driver board defective. Laser optics unit defective. 1. Turn the main power off/on the machine. 2. Replace the interface harness of the laser optics unit. 3. Replace the laser optics unit.

• Code: 203
• Description: Polygon motor off timeout error
  The polygon mirror motor does not leave the READY status within 20 sec. after the polygon mirror motor switched off.
• Causes: Polygon motor/driver board harness loose or disconnected. Polygon motor/driver board defective. Laser optics unit defective. 1. Turn the main power off/on the machine. 2. Replace the interface harness of the laser optics unit. 3. Replace the laser optics unit.

• Code: 204
• Description: Polygon motor lock signal error
  The signal remains HIGH for 200 ms (or 4times in 50msec polling) while the polygon mirror motor is rotating.
• Causes: Polygon motor/driver board harness loose or disconnected. Polygon motor/driver board defective. Laser optics unit defective. 1. Turn the main power off/on the machine. 2. Replace the interface harness of the laser optics unit. 3. Replace the laser optics unit.

• Code: 220
• Description: Beam Synchronize error
  The laser synchronizing detection signal for LD is not output within 400msec after the LD unit has turned on.
• Causes: Disconnected cable from the laser synchronizing detection unit or defective connection. Defective laser synchronizing detector. Defective LD. Defective ECB. 1. Check the connectors. 2. Replace the laser optics unit. 3. Replace the ECB.

• Code: 268
• Description: Laser Scanning Unit thermistor error
  At power on, the temperature sensor in the optics unit detected a temperature lower than -30°C for more than 4 sec. -or- It detected a temperature higher than 105°C for more than 1sec.
• Causes: Thermistor disconnected (causes extremely low temperature reading) Thermistor damaged and short circuited (causes extremely high temperature reading) 1. Turn the machine's main power off, and then on. 2. Replace the thermistor.

• Code: 491
• Description: Bias leak
  An error signal is detected for 0.2 seconds when changing the development unit.
• Causes: Defective transfer roller. Defective high voltage power pack. 1. Turn the machine's main power off, and then on.

• Code: 500
• Description: Main motor error
  The machine does not detect a main motor lock signal within 2sec after the main motor started to rotate. -or- The machine does not release a main motor lock signal within 2sec after the main motor switched off. -or- The machine detects a main motor lock signal every 100ms for seven times consecutively, after the main motor started to rotate stably.
• Causes: Overload of. Torque load overload. Defective main motor. Disconnect or defective motor harness 1. Turn the machine's main power off, and then on. 2. Check or replace the main motor if the torque load is normal. 3. Replace the motor harness.

• Code: 530
• Description: Exhaust fun Error
  The FAN lock signal - High for 10 seconds, after the fan motor started to rotate.
• Causes: Disconnected or defective motor harness. 1. Turn the machine's main power off, and then on.