Gestetner B147, Service Manual

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PROCESS CONTROL
SM 6-11 B147/B149/B190
Detailed
Des
cription
s
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 first series of grade patterns. See the diagram;
this 5-grade pattern is made in black, in yellow, in cyan, and in magenta (20
squares in total). They are made by changing the development bias and charge
roller voltage. The difference between development bias and charge roller voltage
is always the same.
Third, the machine makes the second series of grade patterns in the same order as
the first series. The development bias and charge roller voltage are different from
those of the first series.
Step 3: Sensor Pattern Detection
The ID sensor detects the densities of the 10 solid-color squares for each color (5
squares in the first series and another 5 squares in the second series). This data
goes to memory.
Step 4: Toner Amount Calculation
The amount of toner on the transfer belt (M/A, mass per unit area, mg/cm
2
) is
calculated for each of the 10 grades of the sensor pattern from the ID sensor
output value from each grade of the pattern.
Left
Transfer belt
12 mm
15 mm
B146D502.WMF