Image Signal Flow; Carriage (Lamp Unit) Shift (Scan) Speed - Sharp MX-M550U Service Manual

(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.
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).
In the LSU, the VIDEO signals are converted into laser beams, which are radiated onto the drum.
DRUM

(4) Carriage (lamp unit) shift (scan) speed

The carriage scan speed depends on the copy magnification ratio.
Speed up to 171% = 220mm/s
Speed of 172% - 400% = 110mm/s
(5) Timing chart
Platen timing chart
DSPF duplex timing chart
CIS
Copy lamp unit
CCD UN
LSU
MM
Feed
MIMD
Home position
MHPS
Scan
CCD
PSW
SPFM
1030mS
SRRC
SPPD4
SPOD
55mS
181mS
CCD
CIS
MX-M700N SCANNER SECTION D – 3
HDD
MOTHER PWB
MFP CONTROL PWB
Return
Home position
94mS
PCU PWB