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2.2 Resetting the developing bias voltage counter
Since print density is likely to become darker as the toner gets older, the developing bias is
lowered by degrees (bias voltage is reduced) according to the number of develop roller
rotations so that an almost fixed density can be maintained from the beginning to the end.
The developing bias voltage can be verified in the display of log information (Function code
80).
<Procedure>
(1) Open the front cover.
(2) MFC7840W/7840N/7450/7440N/7340/7320
Press the Clear/Back button.
DCP7045N/7040/7030
Press the Clear/Back button.
"Replace Drum? / 1. Yes 2. No" appears on the LCD.
(3) MFC7840W/7840N/7450/7440N/7340/7320
Press the button in order of , 0, 0.
DCP7045N/7040/7030
Press the Start button, and then press the or button. "00" appears on the LCD,
and then press the OK button.
(4) Close the front cover.
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