Sharp R-6R50 - Microwave Measurement

§-6R50(W}/{B)}
3-6G50(W)}/{B)
3-6G52(W)/(B)
3-6R70(W)/(B)
1ST
LATCH
SWITCH,
2ND
LATCH
SWITCH,
STOP
SWITCH
MONITOR
SWITCH
AND
HEATER
SWITCH
REMOVAL
Disconnect
the
oven
from
power
supply
and
remove
the
outer
case
cabinet.
—
2.
Discharge
the
high
voltage
capacitor.
3.
Remove
the
single
(1)
screw
hoiding
the
relay
mounting
plate
to
the
base
plate.
4,
Remove
the
two
(2)
screws
holding
the
latch
hook
to
the
oven.
5.
Open
the
door
and
pull
the
latch
hook
out
of
the
oven
flange.
(Refere to Figure C-3.)
For 1st latch switch;
1)
Disconnect
the
wire
leads
from
the
1st
latch
switch.
2)
Push
the
retaining
tab(holding
the
left
side
of
the
1st
latch
switch)
lettwards
slightly,
and
then
push
the
1st
latch
switch
downwards(to
the
ar-
row
direction),
and
remove
it
from
the
[atch
hook.
For other switches;
The
switches
can
be
removed
by
doing
proce-
dure as same as above.
CAUTION:
WHEN
REMOVING
THE
SWITCHES,
DON’T
BREAK
THE
TABS
OF
THE
LATCH HOOK,
Laich hook
Stop switch
Push backwards
2nd latch
switch
Push upwards
Pull forwards
Push backwards
Monitor switch
Tst laich
“== switch
Push leftwards
Figure C-3. Switch Removal
1ST
LATCH
SWITCH,
2ND
LATCH,
STOP
SWITCH,
HEATER
SWITCH
AND
MONITOR
SWITCH
ADJUSTMENT
om,
In
case
Ist
latch
switch,
2nd
latch,
stop
switch,
heater
switch
and
monitor
switch
do
not
operate
properly
due
to
a
mis-adjustment,
the
following
adjustment
should
be
made,
1.
Loosen
the
two
(2)
screws
holding
the
latch
hook.
2.
With
the
door
closed,
adjust
the
latch
hook
by
moving
it
back
and
forward,
or
up
and
down.,
In
and
out
play
of
the
door
allowed
by
the
latch
hook
should
be
less
than
0.5
mm,
-
The
vertical
position
of
the
latch
hook
should
be
_
placed
where
the
‘1st
latch
switch
and
2nd
latch
switch
have
activated
with
the
door
closed.
The
horizontal
position
of
the
latch
hook
should
be
placed
where
the
stop
switch,
heater
switch
and
monitor
switch
have
activated
with
the
door
closed,
3.
Secure
the
screws
with
washers
firmly.
4.
Make
sure
of
the
1st
latch
switch,
2nd
latch
switch,
.
stop
switch,
heater
switch
and
monitor
switch
op-
eration.
If
those
switches
have
not
activated
with
the
door
closed,
loose
two
(2)
screws
holding
latch
hook
and-adjust
the
latch
hook
position.
After
adjustment,
make
sure
of
the
following:
1.
The
1st
latch
switch
and
2nd
latch
switch
interrupt
the
circuit
before
the
door
open,
and
then
the
stop
switch,
heater
switch
and
monitor
switch
(COM-NO)
contacts
interrupt
the
circuit.
2.
The
monitor
switch
(COM-NC)
contacts
close
when
the
door
is
opened.
3.
Re-install
outer
case
and
check
for
microwave
leakage
around
the
door
with
an
approved
micro-
wave
survey
meter.
(Refer
to
Microwave
Measure-
ment
Procedure.)
Stop switch
Monitor
switch
tsi latch
swiich
Switch Jevar
Open lever
Open button
Figure
C-4,
Latch
Switch
Adjustments
i
si
peat.
pee,
4 i
Rs
Q
‘
R-6R50{
R-6G50|
R-6G52
R-6R70(
MICROWAVE MEASUREMENT |
After adjustment of door latch switches, monitor
switch and door are completed individually or collec-
tively, the following leakage test must be performed
with a survey instrument and it must be confirmed that
the result meets the requirements of the performance
standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation
emission in excess of 5mW/cm2 at any point 5cm or
more from external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed
as follows;
1. Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the require-
ment for instrumentations as prescribed by the per-
formance standard for microwave ovens must be
used for testing.
an
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI]! 1500
SIMPSON 380M
. Place the oven tray into the oven cavity. a
. Place the load of 275 +15ml of water initially at
20 +5 °C in the center of the oven tray. The water
container should be a low form of 600 mi beaker
with inside diameter of approx. 8.5cm and made of
an electrically non-conductive material such as
glass or plastic.
The placing of this standard load in the oven is im-
portant not only to protect the oven, but also to in-
sure that any leakage is measured accurately.
. Close the door and turn the oven ON with the timer.
set for several minutes. If the water begins to boil
before the survey is completed, replace it with
275m! of the coo! water.
. Move the probe slowly (not faster that 2.5cm/sec.)}
along the gap.
. The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface
of
the
oven.
(RDB1103U)