Epson Stylus Photo 1390 - 2.3.1 Power Supply Circuit Operating Principle

EPSON Stylus Photo 1390/1400/1410 Revision B
OPERATING PRINCIPLES Electrical Circuit Operating Principles 36
2.3.1 Power Supply Circuit Operating Principle
The power supply circuit board of this product is the C589 PSB.
 Basic circuit structure
 Flyback switching system
 +42VDC and +3.3VDC are supplied to the Printer Mechanism and Control
Board
The following indicates the applications of the voltages generated in this power supply
circuit.
The following is a block diagram of the power supply circuit.
Figure 2-13. Power Supply Circuit Block Diagram
Table 2-9. Supplied Power
Voltage Applications
+42VDC
Rated output current: 0.45A
• CR Motor
•PF Motor
•PG Motor
•ASF Motor
• Pump Motor
• Head drive voltage
+3.3VDC
Rated output current: 0.5A
• Logic sensor circuit
• Sensor circuit
• Nozzle selection circuit (on the Printhead)
• Interface control circuit
C51, C52
C11
D11, D12,
D13, D14
C1, FL1F1, TH1
AC Input
QF1
D51
ESAVE
PSC Signal
+5VDC
+3.3VDC
+42VDC
F51
IC51
Over Current
Protection
TRANS: T1
Smoothing
Circuit
Over Current Limitation
Over Voltage Limitation
Secondary Power
Supply SW function
Low Power mode
Separate-excited
Simulated Resonance
Flyback Converter
Filter Circuit
Full Wave
Rectifier
Circuit
Main Switching
Circuit
Smoothing
Circuit
+3.3V Chopper
Circuit
Fuse for LPS