Image Signal Flow; Carriage (Lamp Unit) Shift (Scan) Speed; Timing Chart; Platen Timing Chart - Sharp AR-M455N 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.
AR-M355N/M455N MAINTENANCE AND DETAILS OF EACH SECTION 7 - 49

(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

MM
Feed
MIMD
Home position
MHPS
Scan
CCD
PSW
SPF duplex timing chart
SPFM
1030mS
SRRC
SPPD4
SPOD
55mS
181mS
CCD
CIS
Return
Home position
94mS