Service Information; Tools And Measuring Instruments; Microwave Leakage Test - LG LMC1575BD Service Manual

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
• Diagonal pliers
• Long nose pliers
• Phillips screwdriver
• Flat blade screwdriver
• Wrench (size 5mm)
• Nutdriver (size 5mm)
• Adjustable wrench
• Soldering iron
• Solder
• Vinyl insulation tape
• Polishing cloth
• Hex screw diver

MICROWAVE LEAKAGE TEST

CAUTIONS
• Be sure to check microwave leakage prior to servicing the oven if the oven
is operative prior to servicing.
• The service personnel should inform the manufacture importer, or
assembler of any certified oven unit found to have a microwave emission
level in excess of 5 mW/cm and should repair any unit found to have excessive
2
emission levels at no cost to the owner and should ascertain the cause of the
excessive leakage. The service personnel should instruct the owner not to use
the unit until the oven has been brought into compliance.
• If the oven operates with the door open, the service personnel should:
- Tell the user not to operate the oven.
- Contact the manufacturer.
• The service personnel should check all surface and vent openings for microwave
leakage.
• Check for microwave leakage after every servicing. The power density of the
microwave radiation leakage emitted by the microwave oven should not exceed
5 mW/cm . Always start measuring of an unknown field to assure safety for
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operating personnel from radiation leakage.

SERVICE INFORMATION

NECESSARY MEASURING INSTRUMENTS
• TESTER (VOLTS-DC, AC, Ohmmeter)
• Microwave survey meter
• Inch scale
• 600 cc non conductive material beaker (glass or plastic), inside diameter: approx.
• Cylindrical and made of borosilicate glass vessel.
• Glass thermometer: 100°C or 212°F (1 deg scale) or digital thermometer (testo
MEASURING MICROWAVE ENERGY LEAKAGE
• Pour 275±15cc of 20±5°C(68±9°F) water in a beaker which is graduated to
• Set the energy leakage monitor to 2,450 MHz and use it following the
• When measuring the leakage, always use the 2- inch (5cm) spacer supplied
• Operate the oven at its maximum output.
• Measure the microwave radiation using and electromagnetic radiation
5-1
- Holaday HI-1500
HI-1501
- Narda 8100
8200
8.5 cm (3 1 / 2 in.)
max. thickness: 3 mm
outside diameter: approx. 190mm
height: approx. 90mm
702).
600 cc, and place the beaker on the center of the turntable.
manufacturer's recommended test procedure to assure correct result.
with the probe.
monitor by holding the probe perpendicular to the surface being measured
Move probe along shaded area
Probe scanning speed
Less than 2.5 cm/sec
(1 in/sec)