DRUM UNIT
SM 6-81 B234/B235/B236/D101/D102/D103
Detailed
Descriptions
NOTE:
• If ΔVL < 0, ΔVL is set to 0.
• If VL detection is abnormal, SC424 is issued and VLref is not updated.
• If the VL detection at this step is displayed by SP3902 008, and the ΔVLref
is displayed by SP3902 009.
• If process control is switched off (SP3901 set to "0") then ΔVLref is set to
"0" and the drum potential sensor does not detect VL.
2-1. Determining Vb: Vb = (Value of SP2201) + ΔVL
The development bias value applied from SP2201 depends on the line speed.
Line Speed SP No. SP Name
Normal Speed SP2201 001 Image Area (Normal Speed)
Low Speed SP2201 004 Image Area (Low Speed)
NOTE:
• Even if the result of the calculation is Vb > 800, the voltage applied by the
power pack is 800V.
• The value of Vb is displayed by SP3902 012.
2-2. Determining VdreM: VDref = (Value of SP2001) + ΔVLref + Vd Calibration
The value of Vd applied from SP2001 depends on the line speed.
Line Speed SP No.
Normal Speed SP2201 001
Low Speed SP2201 005
NOTE:
• Even if the result of the calculation is VDref > 950, VDref is set to 950.
• When ΔVLref is determined, Vdref should be value of SP2001 + ΔVL ≤ 950.
So, Vdref > 950 only when Vd is corrected.
• Count "A" is cleared only when SP2801 (TD Sensor Initial Setting) is
executed:
a) If "A" < SP3903 (VD Correction Counter), there is no VD correction.
b) If "A" > SP3903, the value is corrected by +50.
2-3. Determining VhreM: VHref = (value of VH from SP3904) + ΔVLref
The value of VH applied from SP3904 depends on the line speed.
Line Speed SP No.
Normal Speed SP3904 001
Low Speed SP3904 002
NOTE:
• If VB = 800, then VHref = VH of SP3904 + (800 – Vb of SP2201) for the
value of development bias on image areas.
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