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.
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.
Table 2-7. DC Voltage Distribution
Voltage Application
+35 VDC
Motor drive (carriage and paper feed)
Printhead (through the drive voltage generation circuit)
+5 VDC
C137 MAIN Board
Sensors (home position, paper end, no ink cartridge, head thermistor)
Control panel, head nozzle selector
C137 PSB
+5 VDC
+35 VDC
C162 MAIN
C137 PNL
R-T02 Head
M-4A60 Printer Mechanism
YMC Head
Driver
Black Head
Driver
R-T01 Head
CR/PF Motor
Figure 2-15. Block Diagram of the Electrical Circuitry
Stylus Pro XL Operating Principles
REV.-A 2-13
