Samsung SCX-5312F - Page 135

3-18
CIRCUIT DESCRIPTION
Samsung Electronics
Repair Manual
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 sensor for detecting
CCD home position and Scan-end position. The home position is detected by a optical sensor which is attached to the CCD
Module. The Scan-end position is calculated by number 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 : 5mS
• Light Source Power : +12V
• Maximum Pixel frequency : 6 MHz
• Effective Sensor Element : 5340 X 3
• Clamp Level : 0.7~0.8V
• Bright Output : MIN 0.8V
IRQ
[AFE]
12-bit
A/ D converter
Shading
Correction
Enlargement
/ Redu ction
SRAM
8192
x
8
(2line)
Image
Processing
Module
DMA
Interface
CIP3
Register
CPU I/F
Mod ule
Vp eak
Control
Motor
Con tro l
AIN
AD C_REFT
ADC_REFB
PI_TG
PI 1
R_L ED,
G_LED,
B _LED
Gamma
Correction
SRAM_A[ 15:0]
SRAM_D[ 15:0]
SRA M_n RD
SRA M_n WR
A [5: 0] D [15: 0]nCS nRD nWR nXDREQ nXDACK
TX_A, B
nTX_A, B
TX_EN1, EN2
Sensor
Interface
Shading
Acquisitio n
SRAM
1024
x
8
(R/G/B)
SRAM
4096
x
16
(2 line)
SRAM
256
x
8
PI 2
EXT SRAM
Interrupt
Contro l
Vertical
Decimation
SRAM
1024
x
8
<Block Diagram>