Reading The Output Of The Ae Sensor - Canon NP6320 Service Manual

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 lamp regulator.
The data representing the adjusted AE reference/slope values are written to EEPROM when
'C00' or 'C01' is used in the service mode.
Q702
24V
AE sensor PCB
COPYRIGHT © 1999 CANON INC.
CHAPTER 4 IMAGE FORMATION SYSTEM
24V
J34-2
Q701
AEGIN
J34-1
Figure 4-502
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Q315
EEP
ROM
AE
J317-8
J317-7
VR301
DC controller PCB
ZXDP Lamp
driver
PCB
4-13