Step 2: Id Sensor Solid Pattern Generation - Ricoh J-P2 Service Manual

PROCESS CONTROL 17 January, 2003

Step 2: ID Sensor Solid Pattern Generation

12 mm
15 mm
Left
Transfer belt
G080D905.WMF
The machine agitates the developer for between 15 and 60 seconds until the
fluctuation in TD sensor output becomes less than 0.3V, and then makes a 5-grade
pattern on the transfer belt for each toner color. The pattern consists of 5 squares
(the sequence is as follows: 5 black squares, 5 yellow squares, 5 cyan squares,
and 5 magenta squares). Each of the squares is 12 mm x 15 mm, and is a solid-
color square. 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.
Step 3: Sensor Pattern Detection
The ID sensor detects the densities of the 5 solid-color squares for each color. This
data goes to memory.
Step 4: Toner Amount Calculation
2
The amount of toner on the transfer belt (M/A, mass per unit area, mg/cm ) is
calculated for each of the 5 grades of the sensor pattern from the ID sensor output
value from each grade of the pattern.
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