Operating Principles STYLUS 800 Service Manual
2.3 OPERATING PRINCIPLES OF THE ELECTRICAL CIRCUITRIES
The
Stylus
800 contains the
following circuit board units:
■
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
/Carriage
AC Input Printer mechanism
,\
/
,-------
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C106
PSB/PSE
+35VDC
L
+5VDC
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1.....
Head driver
Board
I
Printhead
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Figure 2-11. Block Diagram of the Electrical
2.3.1 Operating Principles of the Power Supply Circuit
Head drive
*
voltage
(+35VDC)
C106
MAIN
C106
PNL
LI
Circuities
f
,,,
1,
. .
.
(’,”
,.
.,%
{.
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.
Table 2-5. DC Voltage Distribution
I
Voltage
~
Application
+35
VDC
~
Motor drive (carriage and paper feed)
~
Printhead
(through the drive voltage generation circuit)
/
C106 MAIN BOARD
+5
VDC
I
Sensors (home position and paperend)
1
Control panel
~
(PF motor holding voltage)
.,
2-1o
Rev. A