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Ref. 2-18
<Developing Bias Voltage>
When the new toner detection mechanism detects the change to a new toner cartridge, the
developing bias voltage is reset. Toner in use tends to have a low printing density at the time
of first use, but the density gradually becomes higher after a certain period of use.
The properties of the toner is controlled by means of the developing bias voltage. The values
are varied according to counts of the amount of toner used immediately after a toner cartridge
is changed so that excellent print quality of even contrast can be obtained constantly from the
printing start time to the stop time. In addition, the developing bias voltage of all the toner
cartridges are periodically corrected so as to eliminate variation in the density of the four
colors.
Fig. Ref2-14
Memo:
If a toner cartridge in use is changed to a cartridge which has previously been in use, the
developing bias voltage will become incorrect to the change color density. Toner cartridges
being used must not be replaced with other ones. As this will cause print defects.
[Used toner amount]
Developing bias voltage
Print density
Actual control
[Density]
[Voltage]
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