Electrified Potential/ Development Bias and Vref Correction are done with the following method.

The operation time differs depending on the line speed.

  1. Adjusting the ID sensor Vsg
    The machine adjusts the LED strength of the ID sensor so that the value of Vsg (the charge which is detected from the background on the transfer belt) will be in the range of 4.0V ±0.5V. When Vsg is detected as not within the target range three times, SC370 (ID sensor error) will be detected.

    • SP3-320-031/032/033 (Vsg Error Counter)
    • SP3-320-013 (Vsg Upper Threshold)
    • SP3-320-014 (Vsg Lower Threshold)

  2. Agitating the Developer (10 seconds)
    The machine agitates the developer and reads the TD sensor output.

    • SP3-539-001 (Dev Agitating Time :Set)

  3. Creating patterns, detecting the density
    5 patterns are created on the transfer belt and detected by each ID sensor, with the charge and development bias adjusted to create each pattern.
    The ID sensor contains an LED [B] and two types of photo detector. The sensor detects the reflection from the LED with the positive reflection detector (REG) [A] and the diffused reflection detector (DIF) [C].
  4. Determining Vref from the Development Gamma
    This decides the charge voltage and development bias