Operating Principles Of The Electrical Circuits; Figure 2-15. Block Diagram Of The Electrical Circuits; Operating Principles Of The Power Supply Circuit; Table 2-7. Dc Voltage Distribution - Epson Stylus Pro Service Manual

Operating Principles

2.3 OPERATING PRINCIPLES OF THE ELECTRICAL CIRCUITS

The Stylus Color Pro contains the following circuit board units:
r C164 MAIN Board (main control circuit board).
r C137 PSB/PSE Board (power supply circuit board). This board is the same as Stylus Color's
r C137 PNL (control panel board). This board is the same as Stylus Color's.
In addition to the circuit boards above, part of the printhead drive circuit is built on a separate circuit board
installed in the carriage unit; the printhead is attached directly to this board. The figure below shows a block
diagram of the electrical circuits.
C137 PSB/PSE
+5 VDC
+35 VDC

Figure 2-15. Block Diagram of the Electrical Circuits

2.3.1 Operating Principles of the Power Supply Circuit

The power supply circuitry for this printer is provided either by the C137 PSB board (120 VAC) or the C137
PSE board (220-240 VAC). 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 the application of
output voltages are summarized in the table below.
Voltage
Motor drive (carriage and paper feed)
+35 VDC
Printhead (through the drive voltage generation circuit)
C164 MAIN Board
+5 VDC Sensors (home position, paper end, no ink cartridge, head thermistor)
Control panel, head nozzle selector
2-12
C137 PNL
C164 MAIN

Table 2-7. DC Voltage Distribution

Stylus Pro Service Manual
M-4A11 PRINTER MECHANISM
YMC Head
Driver
R-T02 Head
Application
CR/PF Motor
Carriage Unit
Black Head
Driver
R-T01 Head
Rev.A