• Code: 434
• Description: Potential sensor error 3: Vr adjustment M Vr < –200V. The residual voltage (Vr), the amount of voltage that remains on the surface of the drum after the QL fires is less than –200V.
• Causes: • Drum potential sensor dirty • Drum potential sensor defective • Drum worn
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 435
• Description: Potential sensor error 4: Vr adjustment Y Vr < –200V. The residual voltage (Vr), the amount of voltage that remains on the surface of the drum after the QL fires is less than –200V.
• Causes: • Drum potential sensor dirty • Drum potential sensor defective • Drum worn
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 436
• Description: Potential sensor error: Vd adjustment K The Vd Home reading, the first step of the process control self-check, detected that the development potential of the unexposed areas of the drum are not within the prescribed range (-500 to -900)
• Causes: • Potential sensor dirty • Potential sensor defective • Charge corona unit defective • Drum defective
• Remedy: 1. Check or replace the charge corona unit. 2. Clean or replace the drum potential sensor. 3. Replace the drum unit.

• Code: 437
• Description: Potential sensor error: Vd adjustment C The Vd Home reading, the first step of the process control self-check, detected that the development potential of the unexposed areas of the drum are not within the prescribed range (-500 to -900)
• Causes: • Potential sensor dirty • Potential sensor defective • Charge corona unit defective • Drum defective
• Remedy: 1. Check or replace the charge corona unit. 2. Clean or replace the drum potential sensor. 3. Replace the drum unit.

• Code: 438
• Description: Potential sensor error: Vd adjustment M The Vd Home reading, the first step of the process control self-check, detected that the development potential of the unexposed areas of the drum are not within the prescribed range (-500 to -900)
• Causes: • Potential sensor dirty • Potential sensor defective • Charge corona unit defective • Drum defective
• Remedy: 1. Check or replace the charge corona unit. 2. Clean or replace the drum potential sensor. 3. Replace the drum unit.

• Code: 439
• Description: Potential sensor error: Vd adjustment Y The Vd Home reading, the first step of the process control self-check, detected that the development potential of the unexposed areas of the drum are not within the prescribed range (-500 to -900)
• Causes: • Potential sensor dirty • Potential sensor defective • Charge corona unit defective • Drum defective
• Remedy: 1. Check or replace the charge corona unit. 2. Clean or replace the drum potential sensor. 3. Replace the drum unit.

• Code: 440
• Description: Image transfer HVPS error: K An interrupt checks the status of the HVPS every 10 ms. This SC is issued if the BCU detects a short in the HVPS for K, M, C, or Y.
• Causes: • Transfer HVPS cable disconnected or damaged • Transfer HVPS defective
• Remedy: 1. Check the cables or cable connections of the transfer HVPS. 2. Replace the transfer HVPS.

• Code: 441
• Description: Image transfer HVPS error: C An interrupt checks the status of the HVPS every 10 ms. This SC is issued if the BCU detects a short in the HVPS for K, M, C, or Y.
• Causes: • Transfer HVPS cable disconnected or damaged • Transfer HVPS defective
• Remedy: 1. Check the cables or cable connections of the transfer HVPS. 2. Replace the transfer HVPS.