DRUM UNIT
B234/B235/B236/D101/D102/D103 6-82 SM
3. Determining Vg with the detected Vd: VD = (-VDref) ± 20
The development motor turns on.
15 VD readings are taken at 2 ms intervals from each quarter section of the
drum as it rotates. For each quarter section, the maximum and minimum values
are discarded. The remaining 13 readings for each of the 4 sections are
averaged. Next, the four averages (one from for each section of the drum) are
once again averaged to determine VD.
VD detection begins at 50 ms from the time the power pack switches at a
point 69.9 mm distant from the area between the pre-charge unit and the drum
potential sensor.
VD = VDref ±20V?
If VD = VDref ±20V is not achieved, the grid voltage is adjusted (VD + VDref)
and the VD samplings are done again. This cycle is repeated 5 times. If a
satisfactory result is not obtained (VD = VDref ±20V), then SC420 is issued.
VD = – VDref ±20V?
If VD = – VDref ±20V is achieved, VG is determined. The determined value of
VG is displayed by SP3902 004. VD is displayed by SP3902 002.
15 points x 2 ms 15 points x 2 ms 15 points x 2 ms 15 points x 2 ms
76.59 mm 76.59 mm 76.59 mm 76.59 mm
B234D903.WMF
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