Developing Bias; Hmt (High Grade Micro Toning) Development - Konica Minolta magicolor 8650 Service Manual

Theory of Operation Ver. 2.0 Nov. 2007
11.3.3

Developing bias

• The developing bias voltage (Vdc) is applied to the developing roller so that an adequate
amount of toner is attracted onto the surface of the PC drum.
• In addition to the negative DC component, AC voltage is applied during development to
help toner to be attracted more easily to the surface of the PC drum. This AC component
is applied only while development is taking place. At any other timing, only the DC(-) Vdc
is applied.
• The developing bias (Vdc) is supplied from high voltage unit (HV1).
* Back view
PC drum/Y
11.3.4

HMT (high grade micro toning) development

• The machine employs the two-component non-contact development system.
• With the HMT method, the magnetic developer brush does not rub against the surface of
the PC drum (the images). Accordingly, sharper line images can be reproduced, involv-
ing no uneven image density at the trailing edge or thin lines and achieving even finer
reproduction of the solid image areas.
Developing roller
Developing roller
Developing bias is applied to the pressure plate
A02ET2C530AA
11. Developing section
PC drum
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