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Ricoh G179 User Manual

Ricoh G179
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Drum Charge
SM 6-19 G179
Detailed
Descriptions
6.6.2 CHARGE ROLLER VOLTAGE CORRECTION
Correction for Environmental Conditions
The voltage transferred from roller to drum could vary with the temperature and humidity
around the drum charge roller. The lower the temperature or humidity, the higher the
applied voltage required.
The ID sensor measures the effects of ambient conditions, and any small change in drum
potential caused by changes in temperature/humidity is reflected in the amount of toner
transferred to the drum.
This measurement is done immediately after the ID sensor pattern for toner density control.
After creating ID sensor pattern [A], another pattern [B] is made. To do this, the LD switches
off, the charge roller voltage drops, and the drum potential is reduced to -600V. At the same
time, development bias returns to -550V. The drum potential is now slightly higher than the
development bias, so only a very small amount of toner transfers to the drum. The ID
sensor measures the density of pattern [B], and Vsdp, the output voltage, is compared with
Vsg which was read from the bare drum at the same time.
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA

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Ricoh G179 Specifications

General IconGeneral
BrandRicoh
ModelG179
CategoryAll in One Printer
LanguageEnglish

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