Power Supply Operation; Power Supply Overview - Epson FilmScan 200 Service Manual

FilmScan 200

2.2 POWER SUPPLY OPERATION

The scanner can be powered by either of two power supply boards: the 100-120 V AC power supply board
or 220-240 VDC power supply 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 the engine drive. Table 2-2 shows the input voltages and fuse ratings for these boards.
Input Voltage (VAC)
100 - 120 VAC •}10 %
220 - 240 VAC

2.2.1 Power Supply Overview

Table 2-3 shows the DC voltages created by the secondary side of the power supply board, and the uses
to which each voltage is applied.
Output Supply Voltage (DC)
+24 VDC
+5 VDC
+12 VDC
- 12 VDC
2-8
Table 2-2. Power Supply Boards
Fuse (F1) Rating
2 A / 125 V
Table 2-3. Output DC Voltages and Applications
Output Voltage
+5 VDC / 1.0 A
+24 VDC / 1.0 A
+12 VDC / 0.1 A
-12 VDC / 0.1 A
+5 VDC / 1.0 A
+24 VDC / 1.0 A
+12 VDC / 0.1 A
-12 VDC / 0.1 A
Applications
Main scan motor
Preview motor
Fluorescent lamps
Logic circuit on the digital (main) board
Photo interrupt sensor circuits
LEDs on the front panel units
CCD sensor on the optical unit
Analog circuit on the digital board
CCD sensor on the optical unit
Analog circuit on the digital board
Rev. A