Power Supply Circuit - Epson 610 Service Manual

EPSON Perfection 610

2.1.3 Power Supply Circuit

Power supply circuit board in this scanner generates direct current necessary
for driving the controller board and scanner engine.
See Table 2-1 and Table 2-2 for the power supply circuit board specifications
and the protection circuits for each output voltage/current, respectively. Figure
2-5 shows the power supply circuit diagram.
*: Recovers within 5 minutes.
NOTE: If any of the outputs is shut down, all the other outputs are also shut down.
Operating Principles
Table 2-1. Power Supply Circuit Board Specifications for Each Destination
Specification
100 -120 VAC Range
220 -240 VAC Range
Table 2-2. Protection Circuits for Output Voltages/Currents
Output Output
Over Current Protection
Voltage Current
• The current is held 1A or less by the
5 VDC 1.2A
fold-back characteristic.
• Recovers automatically*.
• The current is held 0.5 or less by the
12 VDC 0.2A
fold-back characteristic of the
generator.
• Recovers automatically*.
• Shut down.
24 VDC 0.7A
• To restore, turn the scanner power off
and then back on.
Unit Part No.
2031592
2031593
Over Voltage Protection
• Shut down.
• To restore, turn the scanner off and
then back on.
• The protection circuit becomes active
when the voltage rises to 5.5 - 7.5
VDC.
• Shut down.
• To restore, turn the scanner power off
and then back on.
• The protection circuit becomes active
when the voltage rises to 14 -17 VDC.
• Shut down.
• To restore, turn the scanner power off
and then back on.
• The protection circuit becomes active
when the voltage rises to 28 -33 VDC.
Engine Mechanism
Fuse
2.5 A / 125 VAC
T2.5AH / 250 VAC
Rev. B
18