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Sharp R-7A53

Sharp R-7A53
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R-7A53
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
A MAGNETRON TEST
NEVER
TOUCH
ANY
PART IN THE
CIRCUIT
WITH
YOUR
HAND
OR
AN
INSULATED
TOOL
WHILE
THE
OVEN
IS
IN
OPERATION.
CARRY
OUT
3D
CHECKS
Isolate
the
magnetron
from
the
high
voltage
circuit
by
removing
all
leads
connected
to
the
filament
terminal.
To
test
for
an
open
circuit
filament
use
an
ohmmeter
to
make
a
continuity
test
between
the
magnetron
filament
terminals,
the
meter
should
show
a
reading
of
less
than
1
ohm.
To
test
for
a
short
circuit
filament
to
anode
condition,
connect
ohmmeter
between
one
of
the
fil-
ament
terminals
and
the
case
of
the
magnetron
(ground).
This
test
should
be
indicated
an
infinite
resistance.
If
a
low
or zero
resistance
reading
is
obtained
then
the
magnetron
should
be
replaced.
(RD82AOl
U)
MICROWAVE OUTPUT POWER (2 liter water load)
The
following
test
procedure
should
be
carried
out
with
the
microwave
oven
in
a
fully
assembled
condition
(with
outer
case
fitted).
Microwave
output
power
from
the
magnetron
can be
measured
by
way
of
substitution,
i.e.
it
can be
measured
by
using
a
water
load
how
much
it
can be
absorbed
by
the
water
load.
To
measure
the
microwave
output
power
in
the
microwave
oven,
the
relation
of
calorie
and
watt
is used. When
P(W)
heating
works
for
t(second),
approximately
P
x
t/4.2
calorie
is
generated.
On
the
other
hand,
if
the
temperature
of
the
water
with
V(ml)
rises
AT
(“C)
during
this
microwave
heating
period,
the
calorie
of
the
water
is V x
AT.
The
formular
is
as
follows;
Pxt/4.2=VxAT
P
(W)
=
4.2
x
V
x
AT
/
t
Our
condition
for
the
water
load
is as
follows:
Room temperature
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
around
20°C
Power
supply
Voltage
.
.
.
.
.
.
.
.
.
.
.
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.
.
.
.
.
.
.
.
.
240
volts
Water
load
.
.
.
...2000
ml
Initial
temperature
.
.
.
.
.
.
.
10
+I
“C
Heating
time
.
.
.
.
.
.
1
min.
52
sec.
P
=
75
x
AT
J
Measuring
method:
A)
Use
two
1
litre
Pyrex
beakers
with
a
diameter
of
approximately
of
12cms.
B)
Place
1
litre
of
10°C
water
in
each
beaker.
C)
Mark
Tl
on
the
one
beaker
and
mark
T2
on
the
other
one.
And
stir
the
water
and
measure
the
temperature
of
water
the
thermometer
and
note
them.
The
graduation
of
the
thermometer
must
be
scaled
by
0.1
“C
at
minimum
and
an
accurate
mercury
thermometer
is
recommended.
D)
Place
the
two
beakers
as
touching
each
other
in
the
centre
of
the
cavity.
E)
Set
the
timer
to
1
minute
52
seconds
at
100%
power
(the
time
required
to
raise
the
water
temperature
IO
degrees
C.)
F)
The
time
must
be
measured
with
stopwatch
or
wristwatch.
G)
After
1
minute
and
52
seconds,
stop
the
oven
by
opening
the
door.
H)
Remove
the
two
beakers
from
the
oven
and
measure
the
temperature
of
the
water
by
stiring
the
water
with
the
thermometer
and
noting
the
readings.
Example
Initial
temperature
.
.
.
.
.
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.
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.
.
.
.
.
.
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.
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.
.
.
Tl
=
10°C
T2
=
11
“C
Temperature
after
1
min.
52
sec. ._..._....._............................................
Tl
=
20°C
T2
=
21
“C
Temperature
difference
Cold-Warm
AT1 =
.
.
.
.
.
.
.
.
.
.
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.
.
.
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.
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.
.
.
.
10°C
AT2
=
10°C
Mean
temperature
rise
AT
.
.
.
.
.
.
.
.
AT
= (AT1
+AT2)
/
2
=
(10°C
+
10°C)
/
2
=
10°C
Measured
output
power
The
equation
is
“P=
75
x
AT”
.
.
.
.
.
.
.
.
.._......._................................
P=
75
x
10°C
=
750
Watts
NOTE: The measured output power should be at least
+15
%
of the rated output
power.
CAUTION:
1
“C
CORRESPONDS
TO
75
WATTS.
REPEAT
MEASUREMENT
IF THE POWER IS
INSUFFICIENT.
4

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