Ricoh B230 Training Program page 112

The machine makes a 10-grade pattern on the image
transfer belt.
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, so the development potential
also changes.
The ID sensor measures the light reflected from each
pattern. From this, the machine can calculate how much
toner is applied on the transfer belt for each of the 10
grade patches.
This is expressed as M/A (mass per unit area), in mg/cm
Step 3: Sensor Pattern Detection
The ID sensor measures the light reflected from each grade of the pattern, to detect
the densities of each grade. This data goes to memory.
Step 4: Toner Amount Calculation
The machine calculates the amount of toner on the transfer belt that is required to
make each of the 10 grades of the sensor pattern. To do this, the machine uses the
output values of the ID sensor from each grade of the pattern.
The amounts of toner are expressed as M/A (mass per unit area, mg/cm2)
More On Steps 2-4
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