Developing Bias; Tcr Sensor Automatic Adjustment - Konica Minolta bizhub 164 Service Manual

Theory of Operation Ver. 1.1 Apr. 2010
13.3.2

Developing Bias

• Vb (-DC, AC) is applied to the developing roller.
• Vb (-DC) is applied to prevent toner from sticking to the background of the image.
• Vb (AC) is applied to enhance good separation of toner from carrier.
• The amount of toner sticking to the surface of the drum is varied according to the differ-
ence in potential between the voltage (Vi) on the surface of the drum and
Vb (-DC).
• Large difference = A greater amount of toner sticks.
• Small difference = A smaller amount of toner sticks.
13.3.3

TCR Sensor Automatic Adjustment

• The developer in the developer mixing chamber is forcibly agitated and the output volt-
age of the TCR sensor is adjusted.
• The output voltage serves as data for calculating the T/C ratio. This adjustment must be
made whenever the developers are changed.
That is, make the TCR sensor automatic adjustment only when the developers are
changed.
13. IMAGING UNIT SECTION (developing)
Developing Bias Terminal
A0XXT2C551AA
31