Epson Stylus Color, Руководство по обслуживанию

Страница: 55 / 151

EPSON Stylus Photo
Rev. A
2-18
2.2 Electrical Circuit Operating Principles
EPSON Stylus Photo contains the following four electric circuit boards.
C206 PSB/PSE board
C209 Main board
Head Driver board
C209 PNL board
C206 PSB/PSE, C209 main board are explained in this section. The head drive board is installed in the
head unit the carriage. The figure below shows electric circuit block diagram.
2.2.1 C206 PSB/PSE Power Board
C206 PSB/PSE board is a power supply board with a RCC switching regulator, which gen42VDC
for drive part and +5VDC for logic part to drive the printer. The table 2-12 below shows application of
voltages generated by C206 PSB/PSE board.
Voltages Application
+42V Motors(CR Motor, PF/Pump Motor)
Print Head Common Voltage
+5V C209 Main control Board logic
C209PNL Panel Board
Sensors (HP sensor, ASF HP sensor, PE sensor)
The power switch of this printer is in the secondary circuit that allows the PSB/PSE board to continue to
supply voltage for both power and logic line for at least 30 seconds until the printhead returns to the
capping position even if the printer turned off during printing. This prevents ink leakage or dried print head
caused by the print head being left uncapped. The AC voltage from the AC inlet is first input to the filter
circuit for higher harmonics absorption and is then input to the rectification and smoothing circuit,
converting into DC voltage. This DC voltage is then input to the switching circuit. Along with this switching
operation by FET on the primary side, +42V voltage is generated and stabilized on the secondary side,
which is then converted into the 5V VDC by the chopping regulator IC.
Figure 2-18 shows the block diagram of the electrical circuit.
+42VDC
+5VDC
C206PSB Board
C209 PNL Board
C209 Main Control Board
Printer Mechanism
CR Motor
PF/Pump Motor
Head Drive Circuit
Various Sensors
Figure 2-17. Electric Circuit Block Diagram
Table 2-12. Application of DC Voltage