Konica Minolta bizhub C658 Service Manual page 1811

bizhub C658/C558/C458/C368/C308/C258
• The developing bias voltage supplied from the high voltage unit is applied to the developing roller of each color of toner via the metal shaft
of the developing drive gear.
• See "IMAGE FORMING CONTROL" for the timing to apply the bias voltage.
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[1] Developing bias voltage application terminal/Y
[3] Developing bias voltage application terminal/C
[5] Developing roller/K
[7] Developing roller/M
(1) Service Mode
(a) Grad/Dev AC Bias V Selection
• The "Grad/Dev AC Bias V" can be changed by changing the setting of "Imaging Process Adjustment/ Grad/Dev AC Bias V Selection"
of the Service Mode. This provides development performance that responds to various types of environment of the users.
• Turning ON the "Grad/Dev AC Bias V Selection" allows the "Grad/Dev AC Bias V" to be decreased down to a voltage value lower than
the ordinary specified value.
• With the ordinary specified value set for the "Grad/Dev AC Bias V" in low atmospheric pressure environments, such as at high
altitudes, leak could occur, resulting in white dots. Leak, and thus white dots on the image, can be prevented from occurring by
lowering the "Grad/Dev AC Bias V".
• For details of the Service Mode, see "
5.3.5 Toner scattering prevention
• The toner scattering prevention plate and toner scattering prevention sheet are equipped in an area around the developing roller,
functioning to prevent toner from scattering.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 5.
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I.5.6.13 Grad/Dev AC Bias V Selection."
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Developing bias voltage application terminal/M
Developing bias voltage application terminal/K
Developing roller/C
Developing roller/Y
DEVELOPING SECTION