Epson GT-30000 Service Manual

A3 Size Color Flat Bed Scanner GT-30000 Revision A
OPERATING PRINCIPLES General Description 23
2.1 General Description
The EPSON GT-30000 are mainly composed of following units:
"
Scanner mechanism
(Lamp and mirror mechanism and drive unit, lens-CCD sensor unit drive
mechanism, Document size sensors)
"
Control circuit boards
"
Power supply circuit boards
"
ADF (Refer to A3 Auto Document Feeders service manual for detail)
The EPSON A3 flat-bed type scanners usually read images by moving the
integral CR unit which consists of the lamp, mirror, and lens-CCD sensor. This
scanner, however, characteristically has the CCD sensor and the lens in the
whole unit attached onto the mechanism as an independent unit. This scanner
is also equipped with the newly designed focusing function which enables the
scanner to focus by adjusting the distance between the lens and the CCD
sensor. Since the separate units in the mechanism such as the lamp and the
mirrors move at their own speed for reading, the incident distance of the
reflected light from the document to the CCD sensor is kept constant.
The control circuit board is designed to be inserted from the rear of the
scanner, and the power supply board fits into a separate shielded
compartment, with both circuit boards being connected only by the relay circuit
board connector inside the scanner mechanism. This makes removal and
maintenance operations much easier.
Figure 2-1. Main Mechanism Structure of GT-30000
HP sensor
PBA-PANEL
board
Document
CR
Motor
unit
lens unit
CN3
CN7
PBA-CONNECT board
CN6
CN5
CN9,
CN10
Drive
shaft
Document size sensors
Drive wires
Drive wires
AC in
ADF I/F
SCSI
terminator SW
SCSI
W/N SW
SCSI
ID SW
Normal
SCSI I/F
CN13
PBA-MAIN board
PWS-
POWER
board
PBA-INS
board
(CCD)
Mirror unit
Lamp/mirror unit
Wide
SCSI I/F
CN2

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.)