Circuit Description - Philips KV-S5055C Service Manual

11 CIRCUIT DESCRIPTION

11.1. Block Diagram-1 (Image Processing)
On this system, the CPU (IC0006) controls the operation of the USB Controller (IC0010), the Gate Arrays (ASICs: IC0035 and
IC0038), the Sensors (Paper Sensor and others), and the Motors (Paper Feed, Conveyor, DFP Pressure).
Motor pulse signals for conveying paper (Conveyor Motor) are provided from the Gate Array (ASIC: IC0035).
On the other hand, motor pulse signals for the other motors are provided from the CPU (IC0006).
The FPGA (IC0030) requires SDRAM (IC0033) as the buffer memory.
The Gate Array (IC0035) requires SDRAM (IC0040 and IC0041) to store and output pre-processed and post-processed image data
for the front side. An additional memory (SO-DIMM) can be installed in CN0017 for image data output.
The FPGA (IC0031) requires SDRAM (IC0034) as the buffer memory.
The Gate Array (IC0038) requires SDRAM (IC0042 and IC0043) to store and output pre-processed and post-processed image data
for the back side. An additional memory (SO-DIMM) can be installed in CN0018 for image data output.
In order to perform duplex scanning, this scanner has 2 CCDs (CCD (F), CCF (B)) to scan image signals for the front and back
sides.
The FPGA (ASIC: IC0030) receives front image signals from the AD converters (IC5007) on the CCD (F) Board, and then performs
the line correction for them. After that, the Gate Array (IC0035) pre-processes them.
The FPGA (ASIC: IC0031) receives back image signals from the AD converters (IC5007) on the CCD (B) Board, and then performs
the line correction for them. After that, the Gate Array (IC0038) pre-processes them.
(Pre-process means shading correction and dpi transformation)
After finishing pre-processing, the Gate Arrays (IC0035 and IC0038) post-process the data into binary or compressed data to be
sent to a PC via the USB Interface.
(Post-process means binary processing (simple binary, auto binary, dither, error diffusion), color, and gray scale
image processing (MTF, Color Correction, Gamma Correction, etc.).)
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