• Code: 270
• Description: Write ASIC communication error • Write/read values were checked twice but failed to match. • Parity error resulted after three attempts.
• Causes: • Cycle the machine off/on. • Harness between OPU and BCU loose, broken, defective • Bridge board defective • BCU defective
• Remedy: 1. Replace the harness between the BCU and bridge board. 2. Replace the bridge board. 3. Replace the BCU.

• 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 PCDU(s) • Defective laser unit
• Remedy: 1. Check and reinstall the image transfer belt unit and PCDU(s). 2. Check if each toner bottle has enough toner. 3. Replace the ID sensor. 4. Replace the image transfer belt unit. 5. Replace the PCDU(s). 6. Replace the laser unit.

• Code: 290
• Description: LDU shutter: Home position error The machine does not detect the home position of the LDU shutter.
• Causes: • Defective LDU shutter motor • LDU shutter broken • Overload on the LDU shutter motor • Defective LDU shutter sensor • Loose or disconnected harnesses between LDU shutter motor and BCU • Defective BCU
• Remedy: 1. Replace the LDU shutter. 2. Replace the LDU shutter motor. 3. Replace the harnesses between LDU shutter motor and BCU. 4. Replace the BCU.

• Code: 291
• Description: LDU shutter: Open position error The machine does not detect the correct open position of the LDU shutter.
• Causes: • Defective LDU shutter motor • LDU shutter broken • Overload on the LDU shutter motor • Defective LDU shutter sensor • Loose or disconnected harnesses between LDU shutter motor and BCU • Defective BCU
• Remedy: 1. Replace the LDU shutter. 2. Replace the LDU shutter motor. 3. Replace the harnesses between LDU shutter motor and BCU. 4. Replace the BCU.

• Code: 292
• Description: LDU shutter: Close position error The machine does not detect the correct closed position of the LDU shutter.
• Causes: • Defective LDU shutter motor • LDU shutter broken • Overload on the LDU shutter motor • Defective LDU shutter sensor • Loose or disconnected harnesses between LDU shutter motor and BCU • Defective BCU
• Remedy: 1. Replace the LDU shutter. 2. Replace the LDU shutter motor. 3. Replace the harnesses between LDU shutter motor and BCU. 4. Replace the BCU.

• Code: 293
• Description: LDU shutter: Time-out error The machine does not detect the output signal from the LDU shutter sensor for 1 second after turning on or off the LDU shutter motor.
• Causes: • Defective LDU shutter motor • LDU shutter broken
• Remedy: 1. Replace the LDU shutter. 2. Replace the LDU shutter motor. 3. Replace the harnesses between LDU shutter motor and BCU. 4. Replace the BCU.

• Code: 312
• Description: AC charge output error [K]. The machine detects the AC charge output for each color 0.3 V or less for 0.2 seconds after the machine has started to detect the AC charge output.
• Causes: • Loosen or broken harnesses to the HVPS: C/B • Not set or broken PCDU • Defective HVPS: C/B
• Remedy: 1. Close the drum securing plate firmly. 2. Make sure that the PCDU terminal plate contacts the machine terminal plate closely at the front side. 3. Set correctly or replace the PCDU. 4. Replace the harnesses to the HVPS: C/B. 5. Replace the HVPS: C/B.

• Code: 313
• Description: AC charge output error [M]. The machine detects the AC charge output for each color 0.3 V or less for 0.2 seconds after the machine has started to detect the AC charge output.
• Causes: • Loosen or broken harnesses to the HVPS: C/B • Not set or broken PCDU • Defective HVPS: C/B
• Remedy: 1. Close the drum securing plate firmly. 2. Make sure that the PCDU terminal plate contacts the machine terminal plate closely at the front side. 3. Set correctly or replace the PCDU. 4. Replace the harnesses to the HVPS: C/B. 5. Replace the HVPS: C/B.