Canon NP6251 Service Manual page 119

Potential sensor
Pre-
amplifier
circuit
Chopper
Electrode
Drum surface potential detection circuit
COPYRIGHT © 1997 CANON INC.
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2.5 mm
(approx.)
Figure 4-103 Sensor Cross Section
Piezoelectric
oscillator
Potential measurement PCB
LED1
Sensor drive circuit
High-voltage
generation/
adjustment circuit
Figure 4-104
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Sensor cover
Electrode
Chopper
1/3
transformer
circuit
DC controller PCB
Level Micro-
shift processor
circuit
4-5