• Code: 422
• Description: Potential sensor error: Vd Adjustment M. The drum potential sensor detects 150V or more on the drum (Vd) for 0.7 msec. when the high voltage charge is supplied to the drum for the initial sampling before exposure.
• Causes: • Drum potential sensor harness, connector is loose, broken, defective • Drum potential sensor dirty • Drum potential sensor defective • Drum connector, harness loose, broken, defective • Drum worn
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 423
• Description: Potential sensor error: Vd Adjustment Y. The drum potential sensor detects 150V or more on the drum (Vd) for 0.7 msec. when the high voltage charge is supplied to the drum for the initial sampling before exposure.
• Causes: • Drum potential sensor harness, connector is loose, broken, defective • Drum potential sensor dirty • Drum potential sensor defective • Drum connector, harness loose, broken, defective • Drum worn
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 424
• Description: Potential sensor error: Vl adjustment K Vpl could not be adjusted to within ±5V of the target Vpl after exposure of the ID sensor patterns.
• Causes: • Drum potential sensor dirty or defective • Drum worn • Poor drum ground connection
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 425
• Description: Potential sensor error: Vl adjustment C Vpl could not be adjusted to within ±5V of the target Vpl after exposure of the ID sensor patterns.
• Causes: • Drum potential sensor dirty or defective • Drum worn • Poor drum ground connection
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 426
• Description: Potential sensor error: Vl adjustment M Vpl could not be adjusted to within ±5V of the target Vpl after exposure of the ID sensor patterns.
• Causes: • Drum potential sensor dirty or defective • Drum worn • Poor drum ground connection
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 427
• Description: Potential sensor error: Vl adjustment Y Vpl could not be adjusted to within ±5V of the target Vpl after exposure of the ID sensor patterns.
• Causes: • Drum potential sensor dirty or defective • Drum worn • Poor drum ground connection
• Remedy: 1. Clean or replace the drum potential sensor. 2. Replace the drum unit.

• Code: 432
• Description: Potential sensor error 1: Vr adjustment K 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: 433
• Description: Potential sensor error 2: Vr adjustment C 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.