Potential control is executed at prescribed times to perform adjustments in the copy process in order to achieve the target image density and produce the best quality images. These adjustments include changing drum charge bias, development roller bias, and LD power.

Gradation patterns are created at prescribed intervals and read by the potential sensors (,,) and the center ID/Music sensor () on the ITB. The machine uses these readings to calculate development gamma for each color.

Potential Control Execution Condition

Potential control is triggered by the following conditions;

  • When the main power is turned ON / When the machine returns from the energy saving mode
  • At the start of a print job
    If any of the following conditions is met after the last print job has ended;
  1. Idle time ≥ Time threshold setting [min.] (SP3-532-001)
  2. Ambient temperature changed ≥ Temperature threshold setting [°C] (SP3-532-002)
  3. Relative humidity changed ≥ Relative humidity threshold setting [%RH] (SP3-532-003)
  4. Absolute humidity changed ≥ Absolute humidity threshold setting [g/m3] (SP3-532-004)
  • During Printing
  1. Page counter for BW (SP3-529-006) ≥ Interval setting for BW [page] (SP3-533-002)
  2. Page counter for FC (SP3-529-007) ≥ Interval setting for FC [page] (SP3-533-012)
  • At the end of a print job
  1. Page counter for BW (SP3-529-006) ≥ Interval setting for BW [page] (SP3-534-002)
  2. Page counter for FC (SP3-529-007) ≥ Interval setting for FC [page] (SP3-534-012)
  • When the front cover open is notified
    If any of the following conditions is met after the last print job has ended;
  1. Idle time ≥ Time threshold setting [min.] (SP3-530-001), and Page counter (SP3-530-007, 008) ≥ Interval setting [page] (SP3-530-005,006) at power ON
  2. Ambient temperature changed ≥ Temperature threshold setting [°C] (SP3-530-002)
  3. Relative humidity changed ≥ Relative humidity threshold setting [%RH] (SP3-530-003)
  4. Absolute humidity changed ≥ Absolute humidity threshold setting [g/m3] (SP3-530-004)
  • Result
    The process control result is displayed in SP3-012-001 (ProCon OK?: History:Latest) with an 8-digit code.