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Samsung SR-S22DTC - Operating Principle of Circuitry; Power, Oscillation, and Reset Circuits

Samsung SR-S22DTC
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8.
Operation
Principle
of
Circuit
8-1)
Power
Source
Part
When
power
is
supplied,
electric
wave
is
rectified
through
BD1
to
generate
voltage
of
about
DC
300V.Top
S/W
is
automatically
switched
to
the
optimum
condition
according
to
load
condition
of
the
second
part.
When
electricity
flows
between
D
and
S
of
the
top
S/W,
electricity
is
generated
inside
the
trans,
and
wnen
the
power
between
D
and
S
is
turned
off,
electricity
which
is
deserted
at
trans
is
transmitted
to
the
second
part.
This
process
is
repeated
to
maintain
the
fixed
voltage
of
12V
by
C102
of
the
second
part.
This
power
supplies
electricity
to
power
source
of
5V,
relay
and
display,
and
it
allows
operation
of
main
PCB
possible.
8-2)
Oscillation
Circuit
Part
Terminal
Oscillation
Frequency
Xout(#31)
Itis
oscillation
circuit
for
synchronism
clock
generation
and
time
calculation
on
information
sending/receiving
of
internal
elements.
It
does
not
carry
out
its
normal
function
because
timing
system
of
MICOM
alters
in
case
the
specification
of
resonator
changes.
8-3)
Reset
Circuit
Part
)
M
;
|
|
Terminal
|
Voltage
|
|
C
Vee
DC
5V
O
M
RESET
|
DC
SV
Reset
circuit
is
a
circuit
which
allows
the
whole
program
operate
on an
initial
position
by
initializing
several
parts
such
as
RAM
inside
of
MICOM
when
power
is
applied
to
MICOM.
When
power
is
supplied,
the
reset
terminal
voltage
becomes
several
tens
us
“LOW”
state
compared
with
Vcc
voltage
(DC
5V)
of
MICOM,
and
it
maintains
“HIGH”
(Vcc
voltage)
state
in
normal
operation
condition.

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