R-222STM - Sharp Home Appliance Service Manual (repair manual). Page 9

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SERVICE INFORMATION 
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 
 
 
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
2
 
and should repair any 
unit found to have excessive 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
2
. Always start measuring of an unknown field 
to assure safety for operating personnel from radiation 
leakage. 
 
NECESSARY MEASURING 
INSTRUMENTS 
• TESTER(VOLTS-DC, AC., Ohmmeter) 
• Microwave survey meter 
- Holaday HI-1710(A) 
- Narda 8100 
8200 
• Inch scale 
• 600 cc non conductive material beaker (glass or 
plastic), inside diameter: approx. 8.5 cm(3
1/2 
in.) 
• Cylindrical and made of borosilicate glass vessel. 
max. thickness: 3 mm 
outside diameter: approx. 190mm 
height: approx. 90mm 
• Glass thermometer: 100°C or 212°F (1 deg scale) 
MEASURING MICROWAVE ENERGY 
LEAKAGE 
• Pour 275±15 cc of 20±5°C(68±9°F) 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 (5 cm) spacer supplied with the probe. 
• Operate the oven at its maximum output. 
• Measure the microwave radiation using and 
electromagnetic radiation 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 
 
5-1 
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