Process Control Flow - Ricoh G165 Service Manual

6.2.2 PROCESS CONTROL FLOW

1. TM sensor correction (Vsg adjustment)
The center TM sensor checks the bare transfer belt's reflectivity and the machine
calibrates the TM sensors.
2. Development bias control
The machine makes a 7-gradation pattern on the transfer belt for each toner color. The
pattern has 9 squares (the sequence is as follows: 7 yellow squares, 7 cyan squares, 7
magenta squares and 7 black squares). Each of the squares is 10 mm x 17 mm, and is
a solid-color square. To make the squares, the machine changes the development bias
and charge roller voltage. The difference between development bias and charge roller
voltage is always the same.
The center TM sensor detects the densities of the 7 solid-color squares for each color.
The machine calculates an appropriate development bias from this data.
This control takes about 33 seconds to be completed.
3. LD power control
For LD power control, the machine does the same sequence described in "2
Development bias control." Finally, the machine calculates an appropriate LD power.
4. MUSIC (Mirror Unit Skew and Interval Control)
The machine uses the TM sensors to measure sample lines deposited on the ITB, and
corrects color image registration adjustment based on the sensor readings. Sample
lines are made on the left, center and right of the ITB.
This control takes about 22 seconds to be completed.
SM 6-13 G165/G166/G167/G181/G183/G184
Process Control