Spf Open/Close Detection (Book Document Detection) - Sharp AL-2021 Service Manual

D. SPF open/close detection
(book document detection)
SPF open/close detection (book document) detection is performed
by detecting the interval between the reference lines on the white
Mylar attached to the paper exit guide (document scanning section)
by the scanner (CCD) and detecting the varied quantity.
B
A
(White Mylar)
Reference line
(CCD)
B
A
Note: When replacing the carriage unit, be sure to execute SIM41-
06.
If SIM41-06 is not executed, the carriage unit may not read
the reference line on the white Mylar, preventing the docu-
ment from being fed.
(Floating)
Reference line
A - B = Varied quantity of pixels
(pixel)
AL-2041 OPERATIONAL DESCRIPTIONS 7 - 9