Sharp MX-4100N Service Manual page 430

2. Operational descriptions
A. Document size detection
Size detection on the document tray
The document size is detected by the DSPF document width sen-
sor (SPWS), and the document length is detected by the DSPF
document length sensors (SPLS1, SPLS2). The document size is
judged from the document width and the document length as
shown in the table below.
When, however, documents of different sizes are mixed and set on
the document tray, the largest size is detected.
Document size
AB series A5
B5
11" x 8.5"
A4
B5R
A4R
8.5" x 13"
B4
A3
11" x 17"
Inch series 8.5" x 5.5"
11" x 8.5"
A4
11" x 8.5"R
8.5" x 13"
8.5" x 14"
A3
11" x 17"
B. Timing chart
To increase the document replacement speed, pre-feed of the second and the later documents is performed for documents of A4/Letter or
smaller sizes. Therefore, a clutch is provided for each transport roller to perform individual control.
Transport speed 314mm/s Letter single-surface transport
SPFFAN
DSPF cooling fan motor
SPUM
DSPF paper feed motor
SPFM
DSPF transport motor
SPFC
DSPF paper feed clutch
SPFC
DSPF paper feed clutch
STRRC
DSPF No.1 resist roller clutch
SPRDMD
DSPF random sensor 1
SPPD1
DSPF paper pass sensor 1
SPPD2
DSPF paper pass sensor 2
STRC
DSPF transport roller clutch
SPPD3
DSPF paper pass sensor 3
SRRC
DSPF No.2 resist roller clutch
SPPD4
DSPF paper pass sensor 4
SPPD5
DSPF paper pass sensor 5
OC scanner scanning
Built-in scanner scanning
SPOD
DSPF paper exit sensor
SPOM
DSPF paper exit motor
Document length sensor
SPLS1 SPLS2
OFF OFF
OFF OFF
OFF OFF
OFF OFF
ON OFF
ON OFF
ON ON
ON ON
ON ON
ON ON
OFF OFF
OFF OFF
OFF OFF
ON OFF
ON ON
ON ON
ON ON
ON ON
Copy key ON
Timer from ON
Timer from ON
11.8mm
12.3mm
37.6mm
39.3mm
MX-5001N DSPF SECTION C – 4
DSPF unit
ON simultaneously with print start of each motor
OFF at 500ms after SPCD OFF of the last paper
ON simultaneously with SPPD2_ON
OFF at 69.4ms after SPPD2_OFF
ON at 12.3mm - 10ms (29ms) after SPPD3 ON
(SIM adjustment)
OFF at 11.8mm (38ms) after SPPD3 OFF
Scanning start at 37.6mm (120ms) from
SPPD4 ON (SIM adjustment)
Scanning start at 39.3mm (125ms) from
SPPD5 ON (SIM adjustment)
Reduces the speed simultaneously with SPOD OFF,
reduces the speed up to 1855PPS in 15.7mm
Drives for 15mm and returns to 3709PPS in 15.7mm.
(Common to each paper size)
SPWS
SPLS1
SPLS2