Sharp MX-M550U Service Manual page 298

(2) Paper size of paper feed trays detection method
a. Multi-purpose paper feed tray (Paper feed tray 3), 500 sheets paper feed tray (Paper feed tray 4)
1) Paper width detection
The paper width is calculated with the VR voltage value (A/D conversion value) linked with the side guide plate.
Paper width and paper size (set in the range of standard value
Width size
Detection Paper size
pattern
A
B WLT/LT
C
D LG/LTR/Foolscap
E
F Exective-R
G
2) Paper size detection
The paper size detection is made by the combination of the cassette paper size detector 1 to 4.
Relationship between each paper size detector detection and paper size
Vertical size
detection
CSS1
Pattern
1 ON
2 OFF
3 OFF
4 OFF
5 ON
6 ON
7 ON
0 OFF
3) Size detection combinations
Paper size Width detection pattern
B5
A4
B5R
A4R
Foolscap
B4
A3
LT
EX-R
LTR
LGL
WLT
Standard
[mm]
A3/A4 297.0
279.4
B4/B5 257.0
215.9
A4R 210.0
184.1
B5R 182.0
CSS1
Detection SW state
CSS2
ON
ON
ON
OFF
OFF
OFF
ON
OFF
Vertical detection
pattern
C
A
G
E
D
B
A
B
F
D
D
B
MX-M700N TRAY PAPER FEED SECTION F – 6
6 [mm]).
Range[mm]
303.0 to 291.0
285.4 to 273.4
263.0 to 251.0
221.9 to 209.9
216.0 to 204.0
190.1 to 178.1
188.0 to 176.0
CSS2
CSS4
CSS3
CSS3 CSS4
OFF ON
OFF ON
ON ON
ON ON
ON ON
ON OFF
ON OFF
OFF OFF
1
2
3
4
5
6
7
2
3
4
6
7
AB size Inch size
B5 Extra
A4 LT
B5R EX-R
A4R LTR
Foolscap Extra
B4 LGL
A3 WLT
Paper feed tray not attached
Width of detection
range
147.0 to 198.0
198.0 to 237.0
237.0 to 274.0
274.0 to 314.0
314.0 to 347.0
347.0 to 389.0
389.0 to 432.8