Panasonic KX-W1500

5.1 Principle of Operation
This
chapter
explains
the
basic
operation
of
the
electronic
circuitry
for
the
KX-W1500
electronic
Personal
Word
Processor.
The
KX-W1500
electronic
personal
word
processor
is
mainly
composed
of
the
Power
Supply
Circuit,
Control
Cir-
cuit,
Printer
Drive
Circuit,
Sensor
Circuits,
Keyboard,
CRT
Display
and
FDD
(Floppy
Disk
Drive).
The
Power
Supply
Circuit
supplies
+-5V
for
logic
circuits
and
FDD,
+11V
for
Hammer
Solenoid
and
Daisywheel
and
DC
motor,
+12V
for
IC
and
CRT
heater,
+18V
for
Spacing
Motor,
+30V
for
F.B.T.
-_
The
Control
Circuit
is
composed
of
ROM,
RAM,
CPU,
three
Gate
Arrays,
CRT
Controller
and
FDD
Controller.
The
Printer
Drive
Circuit
drives
the
carrier
spacing
motor,
the
daisywheel
motor,
the
paper
feed
motor,
the
rib-
bon
feed
motor
and
the
hammer
solenoid.
,
The
Sensor
circuits
are
used
for
detecting
the
mechanical
movement
and
are
composed
of
one
leaf
switch
_
(Lid
Open
Sensor)
and
two
magnetic
sensors
(Carrier
Home/Paper
Feed,
and
Ribbon
Feed
Sensors).
The
Keyboard
is
composed
of
45
alpha/Numeric
keys,
32
Function
keys
and
4
slide
switches.
The
CRT
can
display
80
characters
per
line
and
25
lines
per
one
block.
The
FDD
unit
is
a
single
drive
type
and
can
store
360
K
byte
per
diskette.
Sensors
Hammer solenoid
Daisy Whee! Motor
Ribbon Feed Motor
Paper Feed Motor
Carrier spacing Motor
Drive
Circuit
Power Supply
Circuit
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