Reading The Output Of The Ae Sensor - Canon NP6317 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
C.

Reading the Output of the AE Sensor

The AE sensor consists of a photodiode (Q702) and an operational amplifier (Q701). If the
strength of light striking the photodiode is high, the output voltage (AE) of the amplifier will be
small. If the amount of light is small, the output voltage will be large.
The DC controller reads the output at a certain time after the zero-cross signal (ZXDP) is
received from the DC power supply.
The data representing the adjusted AE reference/slope values are written to EEPROM when
'C0' or 'C1' is used in the service mode.
Q702
AE sensor PCB
4-12
24V
Q701
24V
COPYRIGHT © 1999 CANON INC.
AE
J700-2 J312-11
AEGIN
J700-1 J312-10
Figure 4-502
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
ZXDP
Q315
EEP
ROM
VR301
DC controller PCB
AC driver/
DC power
supply
PCB