Operating Principles Of The Electrical Circuitries; Operating Principles Of The Power Supply Circuit - Epson STYLUS 4001968 Service Manual

Operating Principles

2.3 OPERATING PRINCIPLES OF THE ELECTRICAL CIRCUITRIES

Stylus
The 800 contains the
C106 MAIN BOARD (Main control circuit board)
C106 PSB/PSE BOARD (Power supply circuit 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, and the printhead is attached directly to this board. The
figure below shows a block diagram of the electrical circuitries.
M-481 O
Printer mechanism
AC Input
C106
PSB/PSE
+35VDC
L
Figure 2-11. Block Diagram of the Electrical

2.3.1 Operating Principles of the Power Supply Circuit

The power supply circuitry for this printer is provided either by the C106 PSB BOARD (120 VAC)
or the C106 PSE BOARD (220-240 VAC). Both boards are identical in design and functionality,
except for components in the primary circuit that accommodate the specified input voltage. l%e
input voltage and the application of output voltages are summarized in table below.
Voltage
+35
VDC
2-1o
following circuit board units:
,------- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
,\
1.....
Head driver
Board
Table 2-5. DC Voltage Distribution
I
STYLUS 800 Service Manual
/Carriage
Application
Head drive
MAIN
PNL
L
I
Rev. A
. . .