LG MAB745W 01 Service Manual - Page 12

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 NECESSARY MEASURING INSTRUMENTS • TESTER (VOLTS-DC, AC, Ohmmeter) • 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. 8.5 cm (31/2 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) 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/cm2 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 and CDRH (Center for Devices and Radiological Health) immediately. NOTE: Address on CDRH Office of Compliance(HFZ-312) Center for Devices and Radiological Healthe 1390, Piccard Drive, Rockville. MD 20850 • 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 4 mW/cm2. Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage. MEASURING MICROWAVE ENERGY LEAKAGE • Pour 275±15cc 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 2inch (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 (1 in/sec) 5-1