Canon F1 Service Manual page 58

2
Technology > Controls > DADF > Original Pickup Tray Assembly
■ Original Pickup Tray Assembly
● Original Detection Control
The original sensor (SR1) identifies whether the original is present or not on the original
pickup tray.
Once an original is placed on the original pickup tray, the detecting lever operates together
with the light blocking plate and the light blocking plate passes through the photo interrupter.
As a result, the original sensor (SR1) generates the original detection signal (EMP_S).
Once the tray open/closed sensor (SR9) and the cover open/closed sensor (SR10) detects
that the original pickup tray and the feeder cover are closed respectively, they generate the
original pickup tray open detection signal (TRAY_OPEN_S) and the feeder cover open signal
(COVER_S).
Once the DADF driver PCB receives the original pickup tray open signal (TRAY_OPEN_S),
feeder cover open signal (COVER_S) and original detection signal (EMP_S), the original set
display activation signal (EMP_LED) is generated to activate the original set display (LED).
DADF driver PCB
SR10
LED
SR9
2 Technology > Controls > DADF > Original Pickup Tray Assembly
Original
SR1
Detecting lever
F-2-83
2-45
2-45