Ricoh G031, Service Manual

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PRINTING PROCESS
G031/G032 1-12 SM
1.7 PRINTING PROCESS
G031/4 use an all-in-one type of toner cartridge that includes the drum, toner,
development roller, charge roller and other components.
1. DRUM CHARGE
In the dark, the charge roller gives a negative charge of –600 volts to the organic
photo-conductive (OPC) drum. The charge remains on the surface of the drum
because the OPC layer has a high electrical resistance in the dark.
2. LASER EXPOSURE
The processed print image data from the engine control board (ECB) is transferred
to the drum by a laser beam, which forms an electrical latent image on the drum
surface. The areas exposed by the laser beam drop to about –100 volts.
3. DEVELOPMENT
The magnetic development brush on the development roller approaches the latent
image on the drum. The development roller gives a negative bias of –400 volts to
the toner. Toner particles jump and electrostatically attach to the areas of the drum
surface where the laser reduced the negative charge on the drum.
–600 V
–100 V
–400 V
O P C
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G031V507.WMF