Sharp R-8R51 - Page 10

‘R-8A51(Ww)
R-8R51(B)
FUSE
F2
F8A
control
unit
causes
the
heater
relay
to
operate,
thus
the
current
to
the
heating
element
is
turned
ON/OFF.
1.
ff
the
wire
harness
or
electrical
components
are
:
short-circuited,
this
fuse
F2
F8A
blows
to
prevent
SURGE
RELAY
RY9
AND
—
_—
an
electric
shock
or
fire
hazzard.
SURGE
RESISTOR
R2
100/20w
.
2...The
fuse
F2
also
blows
when
the
asymmetric
§
When
the
START
key
is
touched
the
contacts
rectifier,
H.V.
rectifier,
H.V.
wire
harness,
H.V.
of
the
surge
relay
RY9
close
and
the
surge
current
Capacitor,
magnetron
or
secondary
winding
of
flows
through
the
surge
resistor
R2
for 200
msec_
After
—
—power
transformeris-short
about
20
msec.
since
the
contacts
of
the
surge
relay
.
close,
the
relay
RY2
closes
and
supplies
the
power
FUSE
F1
F6.3A
250V
transformer
with
the
line
voltage.
After
200
msec,
the
surge
relay
RYQ
opens
its
contacts
and
gets
out
of
1.
[f
the
wire
harness
or
electrical
components
are
function.
The
surge
resistor
R2
lets
the
current
(peak
short-circuited,
this
fuse
blows
to
prevent
an
elec-
Current)
flow
when
the
oven
is
switched_on._
If
surge
—_-trie-shock_ar-fi
2zarc_—_———________________
resister
is-defective-
the
homie
fuse
or
the
Weak
point
2.
The
fuse
also
blows
when
1st
latch
switch
SW1
WP
or
F2
F8A
may
break
down
when
the
oven
is
remains
closed
with
the
oven
door
open
and
when
switched
on
(Micowave
mode/
Dual
mode).
the
monitor
switch
;
SW4
closes.
:
CAUTION;
THE
SURGE
RELAY
RY9
CLOSES
FOR
ONLY
200
msec.
JUST
WHEN
THE
This
thermal
cut-out
protect
the
fan
motor
against
OVEN
GETS
RESTARTED,
BUT
OPENS
overheat.
If
its
temperature
goes
up
higher
than
AGAIN.
WITHIN
THIS
200
MSEC.,
THE
104°C
because
the
fan
motor
is
locked
or
the
ven-
RELAY
RY-2
MUST
CLOSE.
tilation
openings
are
blocked,
the
contacts
of
the
thermal
cut-out
TC1
will
open
and
the
line
voltage
=
TURNTABLE
MOTOR
to
the
contro!
unit
will
be
cut
off
and
the
operation
The
turntable
motor
drives
the
roller
Stay
to
rotate
the
of
the
oven
will
be
stoped.
turntable.
The
defective
thermal
cut-out
TC1
must
be
re-
placed
with
new
one.
CONVECTION
MOTOR
The
convection
motor
drives
the
convection
fan
and
TEMPERATURE
FUSE
150°C
TC2
(CONV.)
provids
the
heated
air.
This
temperature
fuse
protect
the
convection
motor
against
overheat.
If
its
temperature
of
the
con-
FAN
MOTOR
vection
motor
rises
above
145°C
because
the
con-
The
fan
motor
drives
a
blade
which
draws
external
cool
vection
fan
is
interrupted,
the
ventilation
openings
air.
This
cool
air
is
directed
through
the
air
vanes
sur-
are
obstruccted
or
the
other
abnormal
matter
rounding
the
Magnetron
and
cools
the
magnetron.
occures,
the
temperature
fuse
;
TC2
opens
and
This
air
is
channeled
through
the
oven
cavity
to
remove
switch
off
the
oven.
The
defective
temperature
steam
and
vapors
given
off
from
the.
heating
foods.
it
fuse
TC2
must
be
replaced
with
new
one.
is
then
exhausted
through
the
exhausing
air
vents
at
the oven cavity.
TEMPERATURE
FUSE
150°C
TC3
This
temperature
fuse
protect
the
oven
against
GRILL
HEATING
ELEMENT
overheat
during
grill
cooking,
convection
cooking
The
grill
heating
element
is
provided
to
brown
the
food
or
dual
(combination)
cooking.
If
the
temperature
and
is
located
on
the
top
of
the
oven
cavity.
rise
above
150°C
because
the
fan
motor
is
interrupte
the
air
inlet
duct
is
blockeed
or
the
ven-
CONVECTION
HEATING
ELEMENT
tilation
openings
are
obstructed,
the
temperature
The
convection
heating
element
is
located
at
the
rear
fuse
TC3
opens
and
switches
off
the.
grill
heating
of
the
oven
cavity.
It
is
intended
to
heat
air
driven
by
element
and
covection
heating
element.
The
de-
the
convection
fan.
The
heated
air
is
kept
in
the
oven
fective
thermal
cut-out
TC1
must
be
replaced
with
and
force-circulated
and
reheated
by
the
convection
new
one.
heating
element.
THERMAL
CUT-OUT
145°C
TC4
(MG)
CONVECTION
COOKING
SYSTEM
This
thermal
cut-out
protects
the
magnetron
This
oven
is
designed
with
a
hot
air
heating
system
against
overheat.
[f
this
temperature
goes
up
where
food
is
not
directly
heated
up
by
the
convection
higher
than
145°C
because
the
fan
motor
is
inter-
heating
element,
but
food
is
heated
by
forced
circu-
rupted,
the
ventilation
openings
are
blocked,
the
lation
of
the
hot
air
produced
by
the
convection
heat-
thermal
cut-out
TC1
will
open
and
the
line
voltages
ing
element.
to
the
power
transformer
T
will
be
cut
off
and
the
The
air
heated
by
the
convection
heating
element
is
operation
of
the
magnetron
MG
will
be
stoped.
circulated
through
the
convection
passage
provided
The
defective
thermal
cut-out
TC1
must
be
re-
on
the
outer
casing
of
the
oven
cavity
by
the
con-
placed
with
new
one.
vection
fan
which
is
driven
by
the
convection
motor.
It
then
enters
the
inside
of
the
oven
through
the
vent
THERMISTOR
holes
provided
on
the
back
side
of
the
oven.
Next,the
The
thermistor
is
a
negative
temperature
coefficient
hot
air
heats
the
food
on
the
turntable
and
leaves
the
type.
The
temperature
in
the
oven
cavity
is
detected
oven
cavity
through
the
vent
in
the
oven
Cavity
rear
through
the
resistance
of
the
thermistor,
and
then
the
wall.