Canon NP6317 Specifications Page 66

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CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT
©
1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-8
IV. CONTROLLING DEVELOPING BIAS
A. Outline
The circuit shown in Figure 4-402 controls the developing bias. Its main functions are as fol-
lows:
1. Switching the AC component of the developing bias ON/OFF.
2. Regulating the voltage of the DC component of the developing bias.
The copy density can be controlled by varying the voltage of the developing bias to suit the
following variables:
1. Setting of the COPY DENSITY lever and recalibration dial
2. AE sensor output
The photosensitive drum gradually deteriorates with use, causing the potential (V
L) of light
areas of the drum to increase, causing the copy density to be incorrect for a given setting of the copy
density lever. To compensate for this, a COPY DENSITY knob, which can be turned to raise the
DC bias by exactly the increase in V
L, and thus produce clear copies again.
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