22
Samsung Electronics
Alignment and Adjustments
5-10 Check for Microwave Leakage
Maximum leakage allowed is 5mW/cm
2
.
4mW/cm
2
is used to allow for measurement and
meter accuracy
WARNING
AVOID THE HIGH VOLTAGE COMPONENTS.
5-10-1 Procedure for Measurement of
Microwave Energy Leakage
1) Pour 275 ±15cc of 20°C±5°C ( 68°F±9°F )
water in a beaker which is graduated to 600cc,
and place the beaker in the center of the oven.
2) Start to operate the oven and measure the
leakage by using a microwave energy survey
meter.
3) Set survey meter with dual ranges to
2,450MHz.
4) When measuring the leakage, always use the 2
inch spacer cone with the probe. Hold the
probe perpendicular to the cabinet door. Place
the spacer cone of the probe on the door and/or
cabinet door seam and move along the seam,
the door viewing window and the exhaust
openings moving the probe in a clockwise
direction at a rate of 1 inch/sec. If the leakage
testing of the cabinet door seam is taken near a
corner of the door, keep the probe
perpendicular to the areas making sure that the
probe end at the base of the cone does not get
closer than 2 inches to any metal. If it gets
closer than 2 inches, erroneous readings may
result.
5) Measured leakage must be less than
4mW/cm2, after repair or adjustment.
5-10-2 Note on Measurement
1) Do not exceed the limited scale.
2) The test probe must be held on the grip of the
handle, otherwise a false reading may result
when the operator's hand is between the
handle and the probe.
3) When high leakage is suspected, do not move
the probe horizontally along the oven surface;
this may cause damage to the probe.
4) Follow the recommendation of the manufacturer
of the microwave energy survey meter.
5-10-3 Record keeping and notification
after measurement
1) After adjustment and repair of a radiation
preventing device, make a repair record for the
measured values, and keep the data.
2) If the radiation leakage is more than 4mW/cm
2
after determining that all parts are in good
condition, functioning properly and the identical
parts are replaced as listed in this manual,
notify that fact to ;
CENTRAL SERVICE CENTRE
3) At least once a year have the microwave
energy survey meter checked for accuracy by
its manufacturer.
5-11 Check the Thermistor sensor
If the Thermistor sensor does not fall into range of
maximum and minimum, it is fault. (eg. Resistor is
235K
Ω
±12% at 25°C. Refer to figure below.)
Probe
Spacer Cone
K
Ω
Thermistor sensor
Thermistor Sensor Temperature
Circuit Tester
