Ricoh B230 Training Program page 111

Steps 2 to 4: Toner Amount for Each Grade
12 mm
15 mm
10 solid grade patches between white and black are developed
Each grade patch is made by changing the development bias
and charge roller voltage.
•
The difference between development bias and charge roller voltage is
always the same.
The ID sensor measures the light reflected from each grade
patch
The machine calculates the amount of toner per unit/area
required to make each grade patch.
Step 2: ID Sensor Solid Pattern Generation
First, the machine agitates the developer for between 15 and 30 seconds until the
fluctuation in TD sensor output becomes less than 0.3V.
Second, the machine makes the grade patterns (see the diagram). This 10-grade
pattern is made in black, yellow, cyan, and magenta (40 squares in total).
• The machine first makes the first five grades for each color (the first 20 squares),
and then the second five grades for each color (the remaining 20 squares).
The patterns are made by changing the development bias and charge roller
voltage. The difference between development bias and charge roller voltage is
always the same. But, the development potential changes for each pattern.
• The development potential is the difference between the development bias and the
charge remaining on the drum where the laser writes a black area. The
development bias changes for each grade, and the charge on black areas of the
image is always the same, so the development potential also changes.
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