Detecting The Presence/Absence Of An Original - Canon DADF-J1 Service Manual

2.3.2 Detecting the Presence/Absence of an Original

The presence/absence of an original in the original tray is detected by the original sensor
(S6).
When an original is placed on the original tray, the light from the light-emitting side of
the original sensor is blocked, causing the light-receiving side of the original sensor to send
the original detection signal (DTS) to the ADF controller PCB, which in response turns on
the Original Set indicator.
When an original is detected
ADF controller PCB
S6
(light-emitting side)
Light is blocked.
S6
(light-receiving side)
COPYRIGHT © 2001 CANON INC.
ADF controller PCB
S6
(light-emitting side)
S6
(light-receiving side)
Original
F02-203-02
2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001
CHAPTER 2 OPERATIONS AND TIMING
When no original is detected
ADF controller PCB
S6
(light-emitting side)
S6
(light-receiving side)
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