Process Control Self-Check - Ricoh PE-P1 Service Manual

6. Detailed Section Descriptions
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.
6

Process Control Self-check

This machine does potential control with a procedure that is known as the process control self-check. This
procedure is done at these 7 times.
1. Initial Power-ON
2. Recovery form Sleep Mode
3. Front or Top Cover Open/Close
4. Ready Status
5. Before Job
6. Page End
7. Job End
1. Initial
• Toner amount control and MUSIC start automatically immediately after the power is turned on,
if one of the following conditions occurs.
1) New AIO detection
170
Timing Execution Mode
• Development Bias Control and MUSIC (approx.
55 seconds)
• MUSIC only (approx. 22 seconds)
• No Execution
One of the control modes is executed at each timing.
What control mode is done depend(s) on some
conditions as described in the text that follows this table.