Samsung SCX-5315F Service Manual page 139

3-3 Scanner
3-3-1 SUMMARY
This flat-bed type device to read manuscripts has 600dpi CCD as an image sensor. There is one optical sen-
sor for detecting CCD home position and Scan-end position. The home position is detected by a optical sen-
sor which is attached to the CCD Module. The Scan-end position is calculated by numer of motor step.
CCD
Charge Coupled Device improves productivity and allows a compact design.
This machine uses a color CCD.
• Minimum Scan Line Time for One Color : 2.5mSec
• Light Source Power : +18V
• Maximum Pixel frequency : 10MHz
• Effective Sensor Element : 5340 X 3
• Clamp Level : 0.7~ 0.8V
• Bright Output : MIN 0.8V
AIN
AD C_REF T
ADC _REFB
12-bit
A / D converter
AFE_CIP4
SRAM
1 024 x 8
( R/G/ B)
SRAM
8 192 x 8
( 2l ine)
Interrupt
IRQ
Contro l
CPU I/F
Mod ule
n CS n RD n WR
Samsung Electronics
PI_TG
PI1 PI2
Sen so r
Interface
Shadi ng
C orrectio n
Gam ma
C orrectio n
Enlarge men t
/ Redu ction
Vp eak
Contro l
Interface
CIP4
Register
A [ 5 : 0] D [ 15 : 0] n XDREQ
<Block Diagram>
- This Document can not be used without Samsung's authorization -
EXT SRAM
Shadi ng
Acqu isitio n
Vertical
D ecim ation
SRAM
Imag e
256 x 8
Processing
Mo dule
SRAM
4 09 6 x16
(2 line )
Mo to r
Con tro l
D MA
SRAM
1 024 x 8
n XDACK
Circuit Description
SRAM_A[ 15:0]
SRAM_D[ 15: 0]
SRAM_nRD
SRAM_nWR
TX_A, B
n TX_A, B
TX_EN1, EN2
3-19