Canon 1730, Service Manual

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Technical Explanation > Original Exposure and Feed System > Controls > Original Size Detection by Original Size Detection Sensors
Technical Explanation > Original Exposure and Feed System > Controls > Original Size Detection by Original Size Detection Sensors
3) ADF is closed. (ADF open/closed detection sensor (PS23): ON)
Original size detection sensor 1 (PS22)/Original size detection sensor 2 (PS21): ON
ADF
PS23: ON
Original size detection sensor 2
(PS21): Change in level
Original size detection sensor 1
(PS22): No change in level
Original
• Note that a wrong original size may be identified because the sensor output level does not
change in the following cases:
• When the black original
• When the original is a book (its thickness does not allow the ADF to close fully, making it
difficult to detect the sensor level change.)
• When the ADF is not closed fully (the sensor level change is not detected after lapse of the
above time-out time (2 seconds).)
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Original sizes are detected as follows according to the combination of sensor output levels:
●AB size
A5R or
undefined size
A4R
Original
size
Original size
detection sensor 1
(PS22)
Original size
detection sensor 2
(PS21)
:No changed
:Changed
●Inch size
STMTR or
undefined size
LTRR
LGL
Original
size
Original size
detection sensor 1
(PS22)
Original size
detection sensor 2
(PS21)
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