Samsung SF-830 Service Manual page 142

3-3 Scanner
3-3-1 SUMMARY
This device to read manuscripts has 300 dpi CIS as an image sensor.
CIS : Contact Image Sensor
This machine uses a color CIS.
• Minimum Scan Line Time for One Color
• Light Source Power
• Maximum Pixel frequency
• Effective Sensor Element
• Clamp Level
• Bright Output
AIN
AD C_REF T
ADC _REFB
[ AFE]
12-bit
A/ D c onv erter
SRAM
1 024 x 8
( R/G/ B)
SRAM
8 192 x 8
( 2l ine)
Interrupt
IRQ
Cont ro l
CPU I/F
Mod ule
n CS n RD n WR
Samsung Electronics
: 1.2 mS
: +12 V
: 1.17 MHz
: 2574
: 1.4 V
: 2.6 V
R_L ED,
G _LE D,
B _LE D
PI_TG
PI1 PI2
Sen so r
Interfac e
Shadi ng
C orrec tio n
Gam ma
C orrec tio n
Enlarge men t
/ Redu c t ion
Vp eak
Contro l
CIP3
Regis ter
A [ 5 : 0] D [ 15 : 0] n XDREQ
<Block Diagram>
EXT SRAM
Shadi ng
Ac qu isitio n
Vertic al
D ec im ation
SRAM
Imag e
256 x 8
Proc es s ing
Mo dule
SRAM
4 09 6 x16
(2 line )
Mo to r
Con tro l
D MA
Interfac e
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
Repair Manual
3-23