Power Supply Operations; Power Supplyovewiew - Epson GT-9000 Service Manual

2.2 POWER SUPPLY OPERATIONS

The scanner can be powered by either of two power supply boards: the 120V B027 PSB board or
the 220/240V B027 PSE board. The only difference in the way these boards operate is in the
primary circuitry. These power boards output the DC voltage necessary to drive the scanner
control circuits and carriage drive mechanism. Table 2-1 shows the input voltages and fuse ratings
for these boards.
Board
Power Supply Overview
2.2.1
The power supply board has two power output lines that supply power to the various control
output supply voltages.
Table 2-2. Power Supply Output Voltages and Applications
Output Supply Voltage (DC)
Rev. A
-
Table 2-1. Power Supply Boards
Rated Input Voltage
Range (VAC)
100-120
85-138
220-240
187-276
Carriage motor drive
Fluorescent lights
Carriage home position sensor
Control panel LEDs
CCD
Amplifier
Amplifier
RS-232D l/F
Fuse F1 Ratings Output Voltages
2.5A 1125V
+24 VDC / 1.OA
+5 VDC / 1.OA
1.25A 1250V
Applications
sensor drive
Operating Principles
2-5