Ricoh G031, Руководство по обслуживанию

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LASER EXPOSURE
SM 2-5 G031/G032
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2.2 LASER EXPOSURE
2.2.1 OVERVIEW
This machine uses a laser diode to produce electrostatic images on an OPC drum.
The laser diode unit converts image data from the ECB into laser pulses, and the
optical components direct these pulses to the drum.
Exposure of the drum by the laser beam creates the latent image. The laser beam
makes the main scan while drum rotation controls the sub scan.
G031 G032
Strength of the beam output 5 mW 5 mW
Strength of the beam on the drum 0.636 mW 0.43 mW
Printing Binary (2 bits/pixel) Binary (2 bits/pixel)
There are two polygon motor speeds:
- G031 -
Resolution (dpi) Modes Motor Speed (rpm) Data Frequency (MHz)
600 300/600 dpi printing 22478.22 22.0926
1,200 1,200 dpi printing 22478.22 44.1851
- G032 -
Resolution (dpi) Modes Motor Speed (rpm) Data Frequency (MHz)
600 300/600 dpi printing 22377.62 15.0528
1,200 1,200 dpi printing 22377.62 30.1056
Differences between 1,200 dpi and 600 dpi printing
To produce 1,200 dpi, the machine uses a different data frequency for the main
scan and a different line speed for the sub scan, compared with 600 dpi printing.
For 1,200 dpi printing, the polygon motor works at the same speed as for 600 dpi
printing but the data frequency is twice as fast as in 600 dpi printing.
The paper at 1,200 dpi is fed at half the speed used for 600 dpi, as follows.
600 dpi printing 1,200 dpi printing
Paper feed line speed 92 mm/s 46 mm/s
The beam diameter for 1,200 dpi printing is the same as for 600 dpi printing.