Epson GT-30000 Service Manual

A3 Size Color Flat Bed Scanner GT-30000 Revision A
TROUBLESHOOTING Overview 36
3.1.3 Troubleshooting Circuit Board Errors
This section describes the check points for the electrical circuit boards.
3.1.3.1 Power Supply Board (PWS-POWER Board)
3.1.3.2 Control Circuit Board (PBA-MAIN Board)
Table 3-8. PWS-POWER Board Troubleshooting
Phenomenon Check Points
<Abnormal voltage>
+5VDC is not output.
Check the input voltage for Z7 (SI-3033).
5 pin
<Abnormal voltage>
+24 VDC is not output.
Check the voltage waveform between D-S of 013.
<Abnormal voltage>
+12 VDC is not output.
Check the input voltage for Z4 (
µ
PC78M12).
 Input pin
<Abnormal voltage>
+3.3 VDC is not output.
Check the voltage waveform between D-S of 012.
Table 3-9. PBA-MAIN Board Troubleshooting
Phenomenon Check Points
<No operation at all>
Reset IC is defective.
Check the input/output signal waveforms
for the following pins of the reset IC
connector (IC4):
 Pin 8 (for RESET signal)
 Pin 5 (for +5V input)
 Pin 3 (for WD output)
<No operation at all>
EEPROM access error
Check the CPU (IC1) for the ROM access
signal waveforms output from the following
pins:
 Pin 2 (for ROM_CS signal)
 Pin 91 (for RD signal)
<No operation at all>
CPU is defective.
Check the CPU (IC1) for the signal
waveform input to the following pin:
 Pin 86 (for EXTAL input)
<Fatal Error>
Carriage does not stop at the home
position.
Check the CPU (IC1) for the signal
waveform input to the following pin:
 Pin 32 (for HPS signal)
<Fatal Error>
Lamp does not light.
Check the output signal waveform and the
+24 V output voltage level at the CPU
connector (IC1):
 Pin 115 (for LAMP signal)
 Pin 5 (for +24V output)
<Fatal Error>
White standard level is not read
properly.
Main cause: ASIC (IC2) is defective.
(Replace PBA-MAIN board.)
<Communication Error>
Bi-directional I/F or SCSI I/F are
defective.
Main cause: ASIC (IC3) and ASIC (IC2) are
defective. (Replace PBA-MAIN board.)
<Image is read abnormally>
Main cause: ASIC (IC2) is defective.
(Replace PBA-MAIN board.)
Table 3-10. PBA-CONNECT Board Troubleshooting
Phenomenon Check Points
<Fatal Error>
Motor drive circuit is defective.
Check the Drive IC (IC1) Phase drive signal
waveform output to the following pin:
 Pin 11 (for CLK signal)
Table 3-9. PBA-MAIN Board Troubleshooting (continued)
Phenomenon Check Points

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.)