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 –600 V. At the same time, development bias returns to –550
V. The drum potential is now slightly higher than the development bias, so only a very small amount of toner
6. Details
320
To Next Page
Loading...
