Epson GT-30000 Service Manual

A3 Size Color Flat Bed Scanner GT-30000 Revision A
OPERATING PRINCIPLES Electrical Circuit Operations 25
2.3 Electrical Circuit Operations
2.3.1 Control Circuit Operation
The control circuits of this scanner are (See "Figure 2-3. Control Circuit
Composition of GT-30000"):
"
PBA-MAIN board (Main control circuit board)
"
PBA-ISN board (CCD sensor board located on the CR)
"
PWS-POWER board
"
PBA-CONNECT board (Relay board)
"
PBA-PANEL board (Control panel)
"
PBA-LAMP board (Lamp board)
Among the various functions controlled by the PBA-MAIN board as well as the
PBA-ISN, these boards control the scanning process from the CCD sensors to
the image signal processing as described below.
1. PBA-MAIN Board (document size detection)
!
Document size sensors detect the size of the document.
2. PBA-ISN Board (CCD image sensor)
!
Photoelectric conversion:
Converts light reflected from the document (light energy) into electrical
energy (electrical charge).
!
Amplification
3. PBA-MAIN Board (processes image data)
ASIC (IC2) on this board manages most of the following functions:
!
A/D conversion:
Converts the image data produced in the form of analog electrical
signals into 12-bit digital data.
!
Shading correction:
Performs image data correction on a black and white basis.
!
Processes the image data according to various setting information
provided by the host, such as gamma correction, color correction, and
halftoning correction.
After completing these processes, image data is output to the host.

Epson GT-30000 Specifications

Power

voltage	AC 100V-120V, 220V-240V
frequency	50-60Hz
power consumption operating without ADF	65W
power consumption operating with ADF	90W
power consumption standby without optional unit	12W

Operating Environment

temperature operating	41ºF to 95ºF (5ºC to 35ºC)
humidity operating	10% to 80% (no condensation)
humidity storage	10% to 85% (no condensation)

Scanning Specifications

optical resolution	600 x 1200 dpi with Micro Step Drive™ technology
maximum resolution	9600 x 9600 dpi with interpolation
effective pixels	7020 x 10200 pixels (600 dpi)
color depth internal	36 bits per pixel
color depth external	24 bits per pixel (selectable)
grayscale depth internal/external	12 bits per pixel
grayscale depth external	8 bits per pixel
scanning speed at 1600 dpi, draft mode, color	0.79 msec/line (approx.)
scanning speed at 1600 dpi, draft mode, grayscale	0.39 msec/line (approx.)
scanning speed at 1600 dpi, draft mode, art	0.39 msec/line (approx.)

Weight and Dimensions

maximum read area	11.7" x 17.0" (297mm x 432mm)
width	25.9" (658mm)
depth	19.2" (488mm)
height	10.0" (254mm)
weight	66 lb (37.5 kg approx.)