8-28 Confidential
8.5 OTHER SERVICE FUNCTION
8.5.1 Resetting the Developing Bias Voltage Counter
Function
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 (maintenance-
mode function code 80 in Section 8.4.15).
Operating Procedure
(1) Open the front cover.
(2) Press the [Clear/Back] button. "Replace Drum? / 1. Yes 2. No" appears on the LCD.
(3) Press the [*], [0] and [0] keys in this order.
(4) Close the front cover.
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