Epson 4003353 - Manual (Page 43)

Color Service Manual Principles
2.3 OPERATING PRINCIPLES OF THE ELECTRICAL CIRCUITS
The Stylus Color contains the following circuit board units:
■ C137MAIN Board (Main control circuit board)
■ C137PSB/PSEBoard (Power supply circuit board)
■ (Control panel board)
In addition to the circuit boards above, part of the drive is built on a separate
circuit board installed in the carriage unit; the is attached directly to this board. The
figure below shows a block diagram of the electrical circuitries.
PNL
MAIN M-4A1O PRINTER MECHANISM
Motor
‘
➤
●
-
Carriage Unit
R-T02 Head R-TOI Head
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-16. Block Diagram of the Circuit
2.3.1 Operating Principles of the Power Supply Circuit
The power supply circuitry for this printer is provided either by the board (120 VAC) or
the board (220-240 Both boards are identical in design and functionality, except for
the components in the primary circuit that accommodate the specified input voltage. The input
voltage and application of output voltages are summarized in the table below.
Table 2-7. DC Voltage Distribution
Voltage
I
Application
Motor drive (carriage and paper feed)
+35 VDC
(through the drive voltage generation circuit)
MAIN Board
+5 VDC Sensors (home position, paper end, no ink cartridge, head thermistor)
Control panel, head nozzle selector
Rev. A
2-13