Ricoh B230 Training Program page 113

Step 5: Determining V
The machine determines the best VD (Drum
potential), and then determines VB (Dev Bias),
and VL (Drum Potential) depending on the
calculated VD.
Step 5: VD, VB, VL Selection and VTREF Adjustment
The machine determines the relationship between the amount of toner on the
transfer belt and the development bias for each of the 10 grades.
From this, the machine determines the best VD to get the target M/A for each color.
Then, based on this VD, the machine determines the best VB and VL. This process
ensures that enough toner is deposited to make black pixels.
D
2
M/A [mg/cm ]
0.40
, V , and V
B L
Dev. Potential
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