Ricoh A66 - Gradation Pattern Potential Detection; Vsg Calibration; Writing the Gradation Pattern

1.3.5 Vsg Calibration
The ID sensor checks the bare drum’s reflectivity and calibrates the output of
the ID sensor to 4
±
0.1 V. This compensates for both the drum’s and the ID
sensor condition, such as dirt on the surface of the drum or ID sensor.
1.3.6 Writing the Gradation Pattern
The machine makes a 12-grade pattern on the drum for each color. Each
grade is made by changing the LD power. At this stage, the patterns are not
developed; they remain as latent images.
1.3.7 Gradation Pattern Potential Detection
The drum potential sensor detects the potential on each grade of the
12-grade sensor pattern latent image, and the output is stored in memory.
30
1st level
of LD power
2nd level
of LD power
3rd level
of LD power
11th level
of LD power
12th level
of LD power
10
PROCESS CONTROL
A166/A187/A189 2-8 SM