Read Sharp AR-M351U / AR-M451U (serv.man14) Service Manual online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 49
(3) Image signal flow
The image signal converted into electric energy (analog signal) is
A-D converted on the CCD PWB. Image processes such as white
balance and shading correction are performed on the scanner
control PWB. The image signal is then sent through the mother
board to the MFP control PWB.
A-D converted on the CCD PWB. Image processes such as white
balance and shading correction are performed on the scanner
control PWB. The image signal is then sent through the mother
board to the MFP control PWB.
In the MFP control PWB, image process is performed according to
the setting content of the operation panel. The image data are
converted into laser lighting signals (VIDEO signals), and sent
through the mother PWB and the PCU to the LSU (Laser Scan
Unit).
the setting content of the operation panel. The image data are
converted into laser lighting signals (VIDEO signals), and sent
through the mother PWB and the PCU to the LSU (Laser Scan
Unit).
In the LSU, the VIDEO signals are converted into laser beams,
which are radiated onto the drum.
which are radiated onto the drum.
(4) Carriage (lamp unit) shift (scan) speed
The carriage scan speed depends on the copy magnification ratio.
Speed up to 171% = 110mm/s
Speed of 172% - 400% = 55mm/s
(5) Timing chart
Platen timing chart
SPF duplex timing chart
PSW
CCD
MHPS
MIMD
MM
Feed
Return
Home position
Home position
Scan
CCD
SPOD
CIS
SPPD4
SRRC
SPFM
1030mS
181mS
55mS
94mS
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