Sharp R-4P58 - Operation Sequence

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OPERATION SEQUENCE
OFF CONDITION
Closing
the
door
activates
the
primary
latch
swlich
andthe
stop
switch.
IMPORTANT: "
When
the
oven
door
is
closed,
the
contacts
COM-NC
of
the
monitor
switch
must
be
open.
When
the
micro-
wave
oven
is
plugged
ina
wall
outlet
(230V
/
50H7z),
the
line
voltage
is
supplied
to
the
noise
filter
and
the
control
unit.
Figure O-1 on page 29
1.
The
oven
display
will
flash
"PRESS
STOP"
in
6
lan-
quage.
2.
Press
the
STOP
button.
The
oven
display
will
flash
"SELECT LANGUAGE" in 6 language.
3. Select language as follows.
3-1.
Choose
desired
language
by
pressing
the
LAN-
GUAGE
button.
3-2,
Start
the
setting
by
pressing
the
START
button.
The
oven
display
will
flash
“SET
CLOCK"
in
se-
lected
language.
4. Set the clock as follows.
4-1.
Choose
the
12
hour
clock
or
the
24
hour
clock
by
pressing
the
CLOCK
setting
button.
4-2.
Set
the
hours
by
rotating
the
TIME/WEIGHT
knob.
4-3.
Changefrom
hoursto
minutes
by
pressing
CLOCK
setting
button.
4-4.
Set
the
minutes
by
rotating
the
TIME/WEIGHT
knob.
4-5.
Start
the
clock
by
pressing
the
CLOCK
setting
button.
NOTE: ‘
1.
If
you
do
not
want
to
set
the
clock,
press
the
STOP
button
once
after
language
is
chosen."
:
"will
appear
on
the
display.
When
the
operation
of
the
oven
is
finished,
"
:
"will
appear
on
the
display
instead
of
the
time
of
day.
2.
The
oven
can
be
also
used
when
the
language
and/or
the
clock
is
not
set..
3. When the oven door is opened, the oven lamp comes
on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter
adesiredccokingtime
by
turning
the
TIME/WEIGHT
knob
and
start
the
oven
by
pressing
START
button.
Function sequence Figure O-2 on page 30
CONNECTED COMPONENTS RELAY
Oven lamp, Turntable motor RY1
High voltage transformer RY2
Grill heating element RY3
Bottom heating element RY4
Fan motor, RY5
1.
The
line
voltage
is
supplied
to
the
primary
winding
of
the
high
voltage
transformer.
The
voltage
is
converted
to
about
3.3
volts
A.C.
output
on
the
filament
winding
and
high
voltage
of
approximately
2000
volts
A.C.
on
the
secondary
winding.
2.
The
filament
winding
voitage
(3.3
volts)
heats
the
magnetron
filament
and
the
high
voltage
(2000
volts)
is
sent
to
the
voltage
doubling
circuit,
where
itis
doubled
to
negative
voltage
of
approximately
4000
volts
D.C..
3.
The
2450
MHz
microwave
energy
produced
in
the
magnetron
generates
a
wave
length
of
12.24
cm.
This
energy
Is
channelled
through
the
waveguide
(transport
channel)
into
the
oven
cavity,
where
the
food
is
placed
to
be
cooked.
4.
When
the
cooking
time
is
up,
asignal
tone
is
heard
and
the
relays
RY1
+
RY2
+
RY5
go
back
to
iheir
home
position.
The
circuits
to
the
oven
lamp,
high
voltage
transformer,
fan
motor
and
turntable
motor
are
cut
off.
5.
When
the
oven
door
is
opened
during
a
cooking
cycle,
ihe
Switthes
Gos
to
Wie
folowing
Gondition,.
wiich ontact ondition
During Oven Door
Cookin Open(No cookin
Primary
latch
Switch
COM-NO
Closed
Opened
Stop
switch
COM-NO
Closed
Opened
Monitor
Switch
COM-NO
Closed
Opened
COM-NG Opened Closed
The
circuit
to
the
high
voltage
transformer,
fan
motor
and
turntable
motor
are
cut
off
when
the
primary
latch
switch
and
stop
switch
are
made
open.
The
oven
lamp
remains
on
even
if
the
oven
door
is
opened
after
the
cooking
cycle
has
been
interrupted,
because
the
relay
RY1
stays
closed.
Shown
in
the
display
is
remaining
time.
6. MONITOR SWITCH CIRCUIT
The
monitor
switch
SW3
is
mechanically
controlled
by
the
oven
door,
and
monitors
the
operation
of
the
primary
latch
switch
SW1.
6-1.
When
the
oven
door
is
opened
during
or
after
the
cycie
of
a
cooking
program,
the
primary
latch
switch
SW1
and
stop
switch
SW2
must
open
their
contacts
first.
Atter
that
the
contacts
(COM-NC)
of
the
monitor
switch
SW3
can
be
closed.
6-2.
When
the
oven
door
is
closed,
the
contacts
(COM-
NG)
of
the
monitor
switch
SW3
must
be
opened.
After
that
the
contacts
of
the
primary
latch
switch
SW11
and
the
stop
switch
SW2
are
closed.
6-3.
When
the
oven
door
is
opened
and
the
contacts
ofthe
primary
latch
switch
SW1
remain
closed,
the
fuse
F1.
T160mA
will
blow,
because
the
monitor
switch
is
closed
and
a
short
circuit
is
caused.
MEDIUM
HIGH,
MEDIUM,
MEDIUM
LOW,
LOW
COOKING
When
the
microwave
oven
is
preset
for
variable
cooking
power,
the
line
voltage
is
supplied
to
the
high
voltage
transformer
intermittently
within
a
32-second
time
base
through
the
relay
contact
which
is
coupled
with
the
cur-
rent-limiting
relay
RY2.
The
following
levels
of
microwave
power
are
given.
100%
24 sec. ON
32 sec. ON
Approx. 100%
8 sec. OFF
SETTING
10%
Approx.
70%
18 sec. ON 14 sec. OFF
50%
Approx.
50%
12 sec. ON 20 sec. OFF
Approx. 30%
26 sec. OFF
Approx. 10%
30%
6 sec, ON
10%
Note:
The
On/Offtime
ratio
does
not
exactly
correspond
to
the
percentage
of
microwave
power,
because
approx. 3seconds are needed for heating up the
magnetron filament.