Read Sharp MX-M850 (serv.man15) Service Manual online
MX-M1100 SCANNER SECTION D – 2
2. Operational descriptions
This machine employs the reduction optical type line CCD for scan
resolution in the main scanning direction. Scan resoultion is 600
DPI in the main scan direction and 300 DPI in the sub scan direc-
tion. Total of 7400 pixels.
Scanning is performed by moving mirror unit 1 and 2 in a sequen-
tial manner to scan the document.
Light reflected from the document to each mirror projects the image
onto the CCD after its been reduced by the lens.
The CCD converts the optical energy into electrical energy (ana-
log) (Photo electric conversion).
The image signal converted into electric energy (analog signal) is
converted on the AFE PWB into a digital signal.
Image processes such as white balance, shading correction are
performed on the SCNCNT PWB. The image signal is then sent to
the MFP control PWB.
In the MFP control PWB, image process is performed according to
the setting condition of the operation panel selected by the end
user EX reduction, enlargement etc. etc..
The image data is converted into video signal and sent to the PCU
then to the LSU (Laser Scan Unit).
In the LSU, the VIDEO signal is converted into laser beams, which
are radiated onto the drum.
The carriage scan speed is as follow.
resolution in the main scanning direction. Scan resoultion is 600
DPI in the main scan direction and 300 DPI in the sub scan direc-
tion. Total of 7400 pixels.
Scanning is performed by moving mirror unit 1 and 2 in a sequen-
tial manner to scan the document.
Light reflected from the document to each mirror projects the image
onto the CCD after its been reduced by the lens.
The CCD converts the optical energy into electrical energy (ana-
log) (Photo electric conversion).
The image signal converted into electric energy (analog signal) is
converted on the AFE PWB into a digital signal.
Image processes such as white balance, shading correction are
performed on the SCNCNT PWB. The image signal is then sent to
the MFP control PWB.
In the MFP control PWB, image process is performed according to
the setting condition of the operation panel selected by the end
user EX reduction, enlargement etc. etc..
The image data is converted into video signal and sent to the PCU
then to the LSU (Laser Scan Unit).
In the LSU, the VIDEO signal is converted into laser beams, which
are radiated onto the drum.
The carriage scan speed is as follow.
3. Disassembly and assembly
A. Scanner unit
SEL_IN 6
Sub scanning document size sensor
Reflectin type
Detects the sub scanning document size.
SEL_IN 7
Sub scanning document size sensor
Reflectin type
Detects the sub scanning document size.
SEL_IN 8
Sub scanning document size sensor
Reflectin type
Detects the sub scanning document size.
TH_CL
CL thermistor PWB
Scanner copy lamp temperature detection.
CLFM
Copy lamp cooling fan
Fan motor
Cools the copy lamp.
CCDFM
CCD coolong fan
Fan motor
Cools the CCD and the CL inverter.
No.
Name
Function / Operation
1
CCD PWB
The Document image is scanned and is converted into a analog signal by the CCD.
2
CL inverter PWB
Inverter for lighting the scanner copy lamp.
3
AFE PWB
Image conversion scanned by CCD.
4
SCNCNT PWB
Controls the scanner.
Signal name
Name
Type
Function / Operation
High speed mode
600dpi
✕ 300dpi
25 - 99%
600mm/s
100%
600mm/s
101 - 200%
600mm/s
201 - 400%
150mm/s
Unit
Parts
Page
Scanner unit
A
Scanner lamp
D - 3/ a
B
Sub scanning document size
sensor
sensor
D - 5/ b
C
Main scanning document size
sensor
sensor
D
CL inverter PWB
D - 5/ c
E
AFE PWB
F
CCD cooling fan
G
CCD unit
H
SCN-Mother PWB
D - 6/ d
I
SCN-Flash PWB
D - 7/e
J
SCNCNT PWB
K
Scanner home position sensor
D - 8/ f
L
Scanner motor
D - 8/ g
M
Copy lamp cooling fan
D - 8/ h
N
CL Thermistor PWB
D - 8/ i
O
Scanner dehumidifying heater
D - 8/ j
C
N
I
O
J
K
M B
H
L
B
D
F
E
G
A
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