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Model
MX-6500N MX-7500N (serv.man27)
Pages
53
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8.03 MB
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PDF
Document
Service Manual
Brand
Device
Copying Equipment / Section 13 Operational Descriptions
File
mx-6500n-mx-7500n-sm27.pdf
Date
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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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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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MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 12
Signal name
Name
Function/Operation
CPFM
Paper feed motor
Drives the paper feed section.
MPED
Manual feed paper empty detector
Detects presence of paper in the manual paper feed tray.
MPFD
Manual feed paper entry detector
Detects entry of paper into the manual paper feed tray.
MPFS
Paper pickup solenoid (Manual paper feed)
Controls pickup of paper. (Manual paper feed)
MPGS
Manual paper feed gate solenoid
Controls open/close of the manual paper feed gate.
MPLD1
Manual paper feed length detector
Detects the manual paper feed tray paper length.
MPUC
Manual paper feed clutch
Controls ON/OFF of the paper feed roller in the manual paper feed section.
MPWD
Manual paper feed tray paper width detector
Detects the manual paper feed tray paper width.
No.
Name
Function/Operation
1
Paper feed roller (Manual paper feed tray)
Feeds paper to the paper transport section.
2
Separation roller (Manual paper feed tray)
Separates paper to prevent double feed.
3
Paper pickup roller (Manual paper feed tray)
Picks up paper to send to the paper feed roller.
4
Torque limiter
A certain level of resistance force is supplied to the rotation of the separation roller to prevent 
double feed.
5
Transport roller 8 (Drive)
Transports paper fed from the manual paper feed tray to the transport roller 16.
6
Transport roller 14 (Drive)
Transports paper fed from the LCC to the transport roller 15.
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