Assessments - 3, GPA: 4
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RESULT Continuity No Continuity Replace fuse CAUSE REMEDY Replace NOTE 1 Fuse blows. Replace NOTE 1 Defective low voltage trans- former 0. or infinite Approx. 150~310 (normal) ReplaceCheck continuity of primary winding of low voltage trans- former Defective high voltage capacitor Normal ReplaceDisconnect one side of the lead wire connected form high volt- age transformer to the high volt- age capacitor and operate the unit Continuity Defective high voltage trans- former Fuse again blows Replace 17 CONDITION CHECK Check continuity of magnetron Defective mag- netron RESULT No Continuity CAUSE REMEDY ReplaceOutlet has proper volt- age Fuse does not blow. CONDITION CHECK Check continuity of primary inter- lock switch Malfunction of pri- mary interlock switch RESULT No Continuity CAUSE REMEDY Adjust or replace Turn table motor and oven lamp do not turn on Check continuity of secondary interlock switch Malfunction of sec- ondary interlock switch No Continuity Adjust or replace Check D.C. voltage being sup- plied to RELAY (RY2) coil Defective touch control circuit 0 V Replace Faulty contacts of RELAY (RY2) or open relay coil Approx. 12 VDC Replace Display do not shown countdown Malfunction of sec- ondary interlock switch Replace Check continuity of power supply cord Open power sup- ply cord No Continuity Replace Defective touch control circuit Normal Replace NOTE All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”. (TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start button is tapped. 18 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT Check continuity of high voltage capacitor terminals with wires removed Continuity CAUSE Defective high voltage trans- former REMEDY Replace No microwave oscillation Check continuity of high voltage rectifier in forward and backward direction with DC megger Continuity in backward direction Defective high voltage rectifier Replace Connect megger leads to mag- netron terminal and magnetron body Continuity Defective mag- netron Replace Check resistance of primary and secondary coil of high voltage transformer 0 . or ° Defective high voltage trans- former Replace Check continuity of magnetron with wires removed No Continuity Defective mag- netron Replace Check continuity of filament termi- nal of high voltage transformer No Continuity Defective high voltage trans- former Replace Check D.C. voltage being sup- plied to RELAY (RY1) coil 0 V Defective touch control circuit Replace Approx 12 VDC Faulty contacts or RELAY (RY1) or open relay coil Replace 19 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 1. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) “ :0” does not display when power is on. 2. A distinct change in the display are not on when they numbers is the display. 3. One or more digits in the display are not on when they should be. 4. Display indicates a number different from one touched. 5. Specific numbers (for example 2 or 3) will not display when the knob is turned. 6. Display does not count down or up with time cooking or clock operation. 7. Oven is programable and cooks normally but no display shows. 8. Display obviously jumps in time while counting down. 9. Display counts down noticeably too fast while cooking. 10. Display does not show the time of day when cancel button is touched. 11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are close, replace touch control circuit. CONDITION CHECK Check rach pad for continuity of the membrane keyboard for the following key- board check procedure Malfunction of touch control circuit of control box sub-assembly RESULT Normal CAUSE REMEDY Replace con- trol box sub- assembly Malfunction of the membrane keyboard Abnormal Replace the membrane keyboard Display does not show programming at all, even if keyboard is touched. NOTE Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's, failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly. 20 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 ove...
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