• Code: 242
• Description: LD error: M
  The BICU detects LDB error a few times consecutively when LDB unit turns on after LDB initialization.
• Causes: Worn-out LD. Disconnected or broken harness of the LD
• Remedy: 1. Replace the harness of the LD. 2. Replace the laser optics housing unit. 3. Replace the BICU.

• Code: 243
• Description: LD error: C
  The BICU detects LDB error a few times consecutively when LDB unit turns on after LDB initialization.
• Causes: Worn-out LD. Disconnected or broken harness of the LD
• Remedy: 1. Replace the harness of the LD. 2. Replace the laser optics housing unit. 3. Replace the BICU.

• Code: 285
• Description: Line position adjustment (MUSIC) error
  Line position adjustment fails four consecutive times.
• Causes: Pattern sampling error (insufficient image density). Defective ID sensors for the line position adjustment. Defective image transfer belt unit. Defective PCU(s). Defective laser optics housing unit.
• Remedy: 1. Do the recovery procedure for SC285 (see "Laser Optics Housing Unit" in "Replacement & Adjustment"). 2. Check and reinstall the image transfer belt unit and PCUs. 3. Check if each toner bottle has enough toner. 4. Replace the ID sensor. 5. Replace the image transfer belt unit. 6. Replace the PCU(s). 7. Replace the laser optics housing unit.

• Code: 290
• Description: Shutter sensor time over error: Close
  The shutter close sensor does not detect "ON" for 2000msec after the shutter motor turns on.
• Causes: Defective shutter close sensor. Disconnected or broken harness. Defective shutter motor. Defective shutter. Shutter motor overload. Defective IOB.
• Remedy: 1. Check or replace the harness. 2. Replace the shutter on the laser optics housing unit. 3. Replace the shutter motor. 4. Replace the shutter close sensor. 5. Replace the IOB.

• Code: 291
• Description: Shutter overrun error 1: Close
  The shutter close sensor loses the "ON" signal after the shutter was closed.
• Causes: Defective motor. Change of load to shutter motor LD.
• Remedy: 1. Replace the shutter on the laser optics housing unit.

• Code: 292
• Description: Shutter overrun error 2: Close
  The shutter close sensor detects "ON" after SC 291 has occurred.
• Causes: Defective motor. Change of load to shutter motorensor.
• Remedy: 1. Replace the shutter on the laser optics housing unit.

• Code: 293
• Description: Shutter sensor time over error: Open
  The shutter open sensor does not detect "ON" for 2000msec after the shutter motor turns on.
• Causes: Defective shutter close sensor. Disconnected or broken harness. Defective shutter motor. Defective shutter. Shutter motor overload. Defective IOB.
• Remedy: 1. Check or replace the harness. 2. Replace the shutter on the laser optics housing unit. 3. Replace the shutter motor. 4. Replace the shutter close sensor. 5. Replace the IOB.

• Code: 294
• Description: Shutter overrun error 1: Open
  The shutter open sensor loses the "ON" signal after the shutter was closed.
• Causes: Defective motor. Change of load to shutter motor.
• Remedy: 1. Replace the shutter on the laser optics housing unit.