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Replace power supply cord. NO Continuity Check continuity of interlock monitor switch with door shut. Replace primary, secondary interlock switch and interlock monitor switch. Continuity YES (Refer to next page) Both continuity Replace fuse and check continuity of both interlock switch’s contact and monitor switch’s contact with door partially open until monitor switch contact. Replace primary, secondary interlock switch and interlock monitor switch. NO Fuse again Disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven. Replace high voltage capacitor. Replace high voltage transformer Normal 14 Does the oven lamp light? Does the turntable turn? YES YES Continuity Does the fan motor work when you shut the door and turn the timer? Check the isolation of filament winding of high voltage transformer. Replace high voltage transformer. NO Continuity Replace magnetron Good Replace or repair oven lamp, turntable motor. NO If microwave do not oscillate, check continuity of filament of magnetron. Poor continuity NO Continuity Check continuity filament tap (3.3V) of high voltage. Replace high Voltage transformer No Continuity Continuity Check continuity filament tap (3.3V) of high voltage. Replace high Voltage transformer Continuity in the reverse direction. Replace magnetron Normal reading should be approx. 0. Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode 15 MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000±5cc of potable water. 2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm. 3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10±2°C (50±3.6°F) It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position. 4. Microwave power is switched on. 5. Heating time should be exactly A seconds. (Refer to table as following) Heating time is measured while the microwave generator is operating at full power. The filament heat-up time for magnetron is not included. 6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5K. 7. The microwave power output P in watts is calculated from the following formula : P=4187 X T/t • T is difference between initial and ending temperature. • It is the heating time. The power measured should be B (Refer to SPECIFICATIONS)W±10.0%. CAUTION : 1. Water load should be measured exactly to 1 liters. 2. Input power voltage should be exactly specified voltage(Refer to SPECIFICATIONS). 3. Ambient temperature should be 20±2°C(68±3.6°F) Heating time for power output: A(second) 70 64 60 56 52 49 47 44 42 40 38 B(W) 600 650 700 750 800 850 900 950 1000 1050 1100 16 2. MICROWAVE RADIATION TEST WARNING : Make sure to check the microwave leakage before and after repair of adjustment. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microwave energy. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test. PROCEDURES 1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100°C(212°F). 2. Pour 275cc±15cc of tap water initially at 20±5°C(68±9°F) in the 600cc glass beaker with an inside diameter of approx. 95mm(3.5in.). 3. Place it at the center of the tray and set it in a cavity. 4. Close the door and operate the oven. 5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz. 1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm2. 2) When measuring the leakage, always use the 5cm(2in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents. 3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, move the probe more slowly. 4) When ...

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