Samsung SR-S24FTA - Circuit operation theory; 8-1. Power supply part; 8-2. Power generator circuit part; 8-3. RESET circuit part

8.
Circuit
operation
theory
8-1.
Power
supply
part
:
)
Power supply for MICOM
and peripheral circuit
Power supply to operate RELAY,
EJECT MOTOR, DISPLAY
About
AC
9V,
pressed
at
2nd
side
of
LVT(LOW
Volt
Transformer),
is
suspended
between
CN10
@
~@
and
DC
5V
is
made
through
constant-voltage
IC
(KA7805)
rectified
by
Rectifier
Diode.
And,
about
AC
17V
is
suspended
between
CN10
©
~
@
and
DC
12V
is
made
through
constant-voltage
IC(KA7812).
8-2.
Power
generator
circuit
part
}
oscillation frequency
X
in(#30)
4MHz
X out(#31)
This
is
a
power
generator
circuit
part
to
generate
synchronous
CLOCK
for
information
transfer
of
MICOM
internal
degauss
and
calculate
time.
On
change
of
spec.
of
RESONATOR,
normal
operation
cannot
be
performed
from
the
result
of
change
of
TIMMING
system
in
MICOM.
8-3.
RESET
circuit
part
)
Terminal
oscillation
frequency
Vcc DC5V
RESET DC 5V
RESET
circuit
is
to
operate
overall
PROGRAM
in
the
primary
state
by
initializing
several
parts
including
RAM
in
the
internal
of
MICOM
when
power
is
supplied
to
MICOM
as
a
result
of
power
input
or
instant
suspension
of
electric
supply.
When
power
is
supplied,
voltage
at
RESET
Terminal
becomes
scores
of
ps
“Low’state,
when
compared
to
the
voltage
of
Vec
(DC
SV)
of
MICOM.
On
the
general
operation
state,”High”
(Vcc
voltage)
state
is
maintained.