5-1
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
NECESSARY MEASURING INSTRUMENTS
●
TESTER (VOLTS-DC, AC, Multimeter)
●
Microwave survey meter
— Holaday HI-1500, HI-1501
— Narda 8100, 8200
●
Inch scale
●
600 cc non conductive material beaker (glass or
plastic), inside diameter: approx. 8.5cm (3
1/2
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)
SERVICE INFORMATION
Tools and Measuring Instruments
CAUTIONS
●
Be sure to check a microwave emission prior to ser-
vicing the oven if the oven is operative prior to ser-
vicing.
●
If the oven operates with door open, the service
personnel 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 radi-
ation leakage emitted by the microwave oven
should not exceed 4 mW/cm
2
.
And always start measuring of an unknown field to
assure safety for operating personnel from radia-
tion leakage.
NOTE: The standard is 5 mW/cm
2
while in the cus-
tomer's home. 4 mW/cm
2
stated here is manufac-
turer's own voluntary standard for units in cus-
tomer's home.
EQUIPMENT
●
Microwave Survey Meter
●
600cc glass beaker
●
Glass thermometer 100°C
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 electro-
magnetic radiation monitor by holding the probe
perpendicular to the surface being measured.
Microwave Leakage Test
Move probe along shaded area.
Probe scanning speed;
Less than 2.5 cm/sec
