CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-10
2.
Controlling the DC Bias
The differential amplifier of Figure 4-402 operates when DCBC is 16V or below. (The range of
DCBC (analog) is 6 to 16V, as set by the copy density knob or the AE system.)
Differential amplifier goes ON.
Variable pulse-width oscillator goes ON.
DC high-voltage transformer goes ON.
The DC bias is applied to the developing cylinder.
The copy density knob changes the DC component of the developing bias as shown in Figure
4-401.
Figure 4-401 Changes in Development Bias
(DC component) by COPY DENSITY Knob
Figure 4-402
AE sensor
COPY DENSITY
knob
COPY DENSITY
lever
24V
24V
T3 drive
circuit
T2 drive
circuit
Variable
pulse-width
oscillator
Differential
amplifier
Q1
ACBON
Microprocessor
DC high-voltage
transformer T3
Static charge
eliminator
Developing
cyinder
Photosensitive
drum
AC high-voltage
transformer T2
D/A
converter
Recoder
AC bias
switching
circuit
High-voltage transformer unit (HVT)
DC controller PCB
DCBC
DC bias
(5)
-500
-400
-300
-200
-100
COPY DENSITY lever scale
DCBC
DC component of
developing bias
6V to 16V
-500V to -0V
Содержание NP6317
Страница 4: ......
Страница 10: ......
Страница 22: ......
Страница 24: ......
Страница 36: ......
Страница 58: ......
Страница 90: ......
Страница 112: ......
Страница 128: ......
Страница 130: ......
Страница 142: ......
Страница 144: ......
Страница 158: ......
Страница 187: ......
Страница 236: ......
Страница 238: ......
Страница 242: ......
Страница 244: ......
Страница 246: ......
Страница 248: ...0499AB0 91 1 PRINTED IN JAPAN IMPRIME AU JAPON This pubication is printed on 70 reprocessed paper ...