Operating Principles Of The Electrical Circuits; Operating Principles Of The Power Supply Circuit - Epson STYLUS PRO XL 4004677 Service Manual

Stylus Pro XL

2.3 OPERATING PRINCIPLES OF THE ELECTRICAL CIRCUITS

The Stylus Pro XL contains the following circuit board units:
C162 MAIN Board (main control circuit board)
C137 PSB/PSE Board (power supply circuit board)
C137 PNL (control panel board)
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 circuitry.
C1 3 7 P SB
+ 5 V D C
+ 3 5 VD C
Figure 2-15. Block Diagram of the Electrical Circuitry

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)
C137 MAIN Board
+5 VDC Sensors (home position, paper end, no ink cartridge, head thermistor)
Control panel, head nozzle selector
REV.-A
C 1 3 7 P N L
C1 6 2 MA IN
Table 2-7. DC Voltage Distribution
M-4 A60 Printer Mechanism
CR/PF Moto r
YMC H ead
Driver
R-T02 Head
Application
Operating Principles
Black Head
Driver
R-T01 Head
2-13