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Tools and Measuring Instruments
NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
• Diagonal pliers
• Long nose pliers
• Cross head screwdriver
• Wrench (size 5 mm)
• Nutdriver (size 5 mm)
• Adjustable wrench
• Soldering iron
• Solder
• Vinyl insulation tape
• Polishing cloth
Microwave Leakage Test
CAUTIONS
Be sure to check a microwave emission prior to
servicing the oven if the oven is operative prior to
servicing.
If the oven operates with door open, the service per-
sonnel should;
—Tell the user not to operate the oven
The service personnel should check all surface and
vent openings for microwave emission testing.
Check for microwave energy leakage after every
servicing. The power density of the microwave
radiation leakage emitted by the microwave oven
should not exceed 4 mW/cm2.
And always start measuring of an unknown field to
assure safety for operating personnel from radiation
leakage.
NOTE: The standard is 5 mW/cm2 while in the
customer's home. 4 mW/cm2 stated here is
manufacturer's own voluntary standard for units in
customer's home.
EQUIPMENT
Microwave Survey Meter
600cc glass beaker
Glass thermometer 100°C
SERVICE INFORMATION
NECESSARY MEASURING
INSTRUMENTS
• TESTER (VOLTS-DC, AC, Multmeter)
• Microwave survey meter
—Holaday H1-1500, Hi-1501
—Narda 8100, 8200
• Inch scale
• 600 cc non conductive material beaker (glass or
plastic), inside diameter: approx. 8.5cm (31/2 in.)
• Cylindrical and made of borosilicate glass vessel max.
thickness: 3mm
outside diameter: approx. 190mm
height: approx. 90mm
• Glass thermometer: 100°C or 212°F (1 deg scale)
MEASURING MICROWAVE ENERGY
LEAKAGE
Pour 275 ± 15cc of 20°C ± 5°C water in a beaker
which is graduated to 600 cc, and place the beaker on
the center of the turntable.
Set the energy leakage monitor to 2,450 MHz and use
it following the manufacturer's recommended test
procedure to assure correct result.
When measuring the leakage, always use the 2 inch
(5cm) spacer supplied with the probe.
Operate the oven at its maximum output.
Measure the microwave radiation using and elec
tromagnetic radiation monitor by holding the probe per-
pendicular to the surface being measured.
Move probe along shaded area.
Probe scanning speed;
Less than 2.5 cm/sec
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