15 February 2006 DRUM UNIT
6-61
Detailed
Descriptions
Drum Potential Sensor Calibration
The potential sensor output is affected by the distance of the sensor from the OPC,
paper dust or other matter on the surface of the sensor, and environmental
conditions. For these reasons, the potential sensor is calibrated often, as described
below.
1. 100 samples are taken at –100V and at –800V, and the readings are averaged.
2. If the readings are within the normal range, then these readings are used to
calibrate the potential sensor.
If the variations in the readings exceed the specified range, then an SC is
logged (Sensor Calibration Error, SC310 to SC317) and automatic process
control halts. The charge grid voltage Vg, development bias, and LD power are
set as follows.
• Development bias is set to the value stored in SP2201-001
• Grid voltage is set to the value stored in SP2001-001
• Laser power is set to a fixed value
500 ms 100 rev.
100 ms intervals
500 ms 100 rev.
100 ms intervals
Sampling
Sampling
Applied Bias
0V
-100V
-800V
B246D921.WMF
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