Leakage Measuring Procedure - Samsung RE-1300 Service Manual

Precaution
For continued protection against radiation hazard, replace parts
in accordance with the wiring diagram and be sure to use the
correct part number for the following switches.: Primary and
secondary interlock switches and the interlock monitor switch
al!
together. Then follow the adjustment procedures below. After
repair and adjustment, be sure to check the continuity of all
interlock switches and the interlock monitor switch.
Door Open [ Door Closed
Primary switch
Monitor switch (COM-NC)
Monitor switch (COM-NO)
Door Sensing S/W
Primary Interlock S/W
witch(A)
Door Sensing S/W
Interlock Monitor S/W
Lever Switch{B}
Key Door
Body Latch
13-2. Output Power of Magnetron
The output power of the magnetron can be simply measured by
performing a water temperature tise test.
Equipment needed for the test: -
* One 1-liter cylindrical borosilicate glass vessel
(Outside diameter of 190mm)
* One glass thermometer with mercury column
vessel's temperature as T1. {10:1°C)
46 : Heating Time (sec)
4,187 : Coefficient for Water
1000 : Water {cc}
AT : Temperature Rise (12-11)
* Output (W)= 91x AT
Minimum
Temperature Rise
. Heat Distribution
= —-—-~—-——— X 100{%)
Maximum
Temperature Rise
The result should exceed 65%.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO MICROWAVE RADIATION FROM
MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING
MICROWAVE ENERGY.
10. Leakage Measuring Procedure
14-1. Equipment
* Microwave Energy Survey Meter
* 600cc glass beaker
* Mercurial or digital thermometer 100°C or 212°F
14-2. Procedure for Measurement of Microwave Energy
Leakage
1) Pour 27541 5cc of 2045°C (6849°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 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 SmW/cm?, after repair
or adjustment.
14-3. Check for Microwave Energy Leakage with Outer
Panel Removed.
1) Remove the outer panel.
2} Pour 275-41 5cc of 2045°C(6849°F) water in a beaker which is
graduated to 600cc, and place the beaker in the center of the
oven.
3) Start to operate the oven at the highest power level.
4) Set survey meter with dual ranges to 2,450MHz.
5) By using the survey meter and spacer cone as described
above, measure around the opening area of magnetron, the
surface of the air guide and the surface of the wave guide as
shown in the following photo but avoid the high voltage
components. The meter should read fess than SmW/cm?,
Survey Meter
WARNING -
AVOID THE HIGH VOLTAGE COMPONENTS.
14-4. 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 teakage 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.
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 5mW/cm? after
determining that all parts are in good condition, functioning
properly and the identical parts are replaced as fisted in this
manual, notify that fact to;
CENTRAL SERVICE CENTER
14-6. At least once a year have the Microwave Energy
Survey Meter checked for accuracy by its
manufacturer.