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Model
MX-6500N MX-7500N (serv.man27)
Pages
53
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8.03 MB
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Service Manual
Brand
Device
Copying Equipment / Section 13 Operational Descriptions
File
mx-6500n-mx-7500n-sm27.pdf
Date

Sharp MX-6500N / MX-7500N (serv.man27) Service Manual ▷ View online

MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 8
B. Operational descriptions
(1)
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.
(2)
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.
Document size
Document length sensor
SPLS1
SPLS2
AB series
A5
OFF
OFF
B5
OFF
OFF
11" x 8.5"
OFF
OFF
A4
OFF
OFF
B5R
ON
OFF
A4R
ON
OFF
8.5" x 13"
ON
ON
B4
ON
ON
A3
ON
ON
11" x 17"
ON
ON
8.5" x 14"
ON
ON
8.5" x 13.4"
ON
ON
8.5" x 13.5"
ON
ON
Inch series
8.5" x 5.5"
OFF
OFF
11" x 8.5"
OFF
OFF
A4
OFF
OFF
11" x 8.5"R
ON
OFF
8.5" x 13"
ON
ON
8.5" x 14"
ON
ON
A3
ON
ON
11" x 17"
ON
ON
8.5" x 13.4"
ON
ON
SPWS
SPLS1
SPLS2
Copy key ON
SPFM
DSPF transport motor
SPOM
DSPF document exit motor
SPUM
DSPF document feed motor
SPFC
DSPF document feed clutch
DSPF No.1 registration roller 
clutch
STRRC
STRC
DSPF transport roller clutch
SRRC
DSPF No.2 registration roller 
clutch
SPRDMD
DSPF document random sensor
SPOD
DSPF document exit sensor
SPPD4
DSPF document pass sensor 4
SPPD5
DSPF document pass sensor 5
SPPD1
DSPF document pass sensor 1
DSPF document pass sensor 2
SPPD2
SPPD3
DSPF document pass sensor 3
Scan transport speed 372mm/s 400dpi letter single transport
ON simultaneously with print start of each motor 
OFF at 500ms after SPOD OFF of the last paper
Decelerates simultaneously with turning off SPOD to 
reduce to 200mm/s for 18.9mm. Drives for 15mm, 
and returns to 372mm/s for 18.9mm. 
(Common to all the paper sizes)
ON simultaneously with SPPD2_ON
OFF at 
25.7
ms after SPPD2_OFF
ON at 12.3mm - 10ms (29ms) after SPPD3 ON (SIM adjustment)
OFF at 10.4mm (28ms) after SPPD3 OFF
1
0
1
1
MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 9
3. Scanner section
A. Electrical and mechanical relation diagram
Signal name
Name
Function/Operation
CLFM
Scanner cooling fan
Cools the scanner unit.
CLI
Scanner lamp
Radiates light onto a document for the CCD to scan the document image.
MHPS
Scanner home position sensor
Detects the home position of the copy lamp unit.
MIM
Scanner motor
Drives the copy lamp unit and the mirror base unit.
 No.
Name
Function/Operation
1
CCD PWB
Scans document images and performs A/D conversion of the scanning signal.
2
SCU PWB
Controls the scanner and the operation section.
3
Scanner lamp drive PWB
Drives the scanner lamp.
4
Lens
Shrinking the image (light) of the document, and project it on CCD.
5
No. 1 mirror
Reflects the document image into the lens.
6
No. 2 mirror
7
No. 3 mirror
8
Reflector
Converges scanner lamp lights to radiate onto the document.
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6
MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 10
B. Operational descriptions
(1)
Outline
This section performs the following functions.
1)
Light is radiated to the document by the scanner lamp, and the
contrast of the reflected light is read by the CCD elements of
three lines of RGB to be converted into the image signal (ana-
log). 
2)
The image signals (analog) are converted into 10bit digital sig-
nals by the A/D converter.
3)
The image signals (digital) are sent to the image process sec-
tion (scanner control PWB).
(2)
Detail description
a. Optical section drive
The optical section drive power is transmitted from the scanner
motor (MIM) to the drive pulley and the wire through the belt, to
drive the copy lamp unit and the mirror base which are attached by
the drive wires.
The scanner motor (MIM) is controlled by the drive signal sent from
the scanner control PWB.
b. Scanner lamp drive
The scanner lamp (CLI) is driven by the scanner lamp drive voltage
generated in the CL LED Drive PWB according to the control signal
sent from the scanner control PWB.
c. Image scan/color separation
Light is radiated to the document by the scanner lamp, and the con-
trast of the reflected light is read by the CCD elements of three
lines of RGB to be converted into the image signal (analog).
The color components of document images are extracted to R, G,
and B separately by the three kinds of CCD elements (R,G,B).
The red CCD extracts the red component of document images, the
green CCD green the components, and the blue CCD the blue
components. This operation is called the color separation.
The CCD unit looks like one unit, but it includes three kinds of CCD
elements, R, G, and B. 
The document scan in the main scanning direction is performed by
the CCD element. The document scan in the sub scanning direc-
tion is performed by shifting the scanner unit with the scanner
motor. Document images are optically reduced by the lens and
reflected to the CCD.
The scan resolution is 600 dpi. 
(Image data for 1 line)
d. Image signal A/D conversion
1)
The image signal (analog) for each of R, G, and B is converted
into 10bit digital signal by the A/D converter.
Each color pixel has 10bit information. 
2)
The 10bit digital image signals of R, G, B are sent to the image
process section. 
e. Zooming operation
Zooming in the sub scanning direction is performed by changing
the scanning speed in the sub scanning direction.
Zooming in the main scanning direction is not performed optically,
but performed with the image process technology (by the software).
B
R
G
R
G
B
R
G
B
Red component 
image data
Green component 
image data
Blue component 
image data
CCD PWB
R
G
B
CCD
(6 Lines)
Analog IC
AFE ADC
LVDS
Buffer
Timing
Generator
MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 11
4. Paper feed section
A. Electrical and mechanical relation diagram
(1)
Manual paper feed section
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