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Calex CME28GT Service Manual

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MICROWAVE OVEN
CME28GT
SERVICE
Manual
CONTENTS
MICROWAVE OVEN
8. PCB Diagrams
CALEX

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Summary of Contents for Calex CME28GT

  • Page 1: Table Of Contents

    MICROWAVE OVEN CME28GT SERVICE Manual CONTENTS MICROWAVE OVEN 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 6. Troubleshooting 7. Exploded Views and Parts List 8. PCB Diagrams 9. Schematic Diagrams CALEX...

  • Page 2: Precaution

    1. Precaution Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents. 1-1 Safety precautions ( 1.
  • Page 3 Pretaution 1-2 Special Servicing Precautions (Continued) 17. When checking the continuity of the switches or transformer, always make sure that the power is OFF, and one of the lead wires is disconnected. 18. Components that are critical for safety are indicated in the circuit diagram by shading, 19.

  • Page 4: Specifications

    2. Specifications 2-1 Table of Specifications MODEL CME28GT ITEM TIMER 99 MINUTES 90 SECONDS POWER SOURCE 230V/50HZ, AC POWER CONSUMPTION MICROWAVE : 1,500W,GRILL : 1,300W OUTPUT POWER FROM100 TO900W (6 LEVEL POWER) (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75P(31)

  • Page 5: Operating Instructions

    3. Operating Instructions 3-1 Control Panel DUAL COOK SELECTION INSTANTREHEAT/ COOK SELECTION AUTO DEFROST SELECTION WEIGHT SELECTION GRILL MODE SELECTION MICROWAVE MODE COMBI MODE SELECTION SELECTION TIME SETTING STANDING TIME SETTING CLOCK SETTING START BUTTON STOP/CANCEL BUTTON 3-2 Features & External Views VENTILATION HOLES LIGHT DISPLAY...

  • Page 6: Disassembly And Reassembly

    4. Disassembly and Reassembly 4-1 Replacement of Magnetron, Motor Assembly and Lamp Remove the magnetron including the shield case, Lamp Thermo S/W Cover Air permanent magnet, choke coils and capacitors (all of which are contained in one assembly). 1. Disconnect all lead wires from the magnetron and lamp.
  • Page 7 Disassembly and Reassembly 4-3 Replacement of Door Assembly 4-3-1 Removal of Door "C" Insert flat screwdriver into the gap between Door "A" and Door "C" to remove Door "C". Be careful Door "A" when handling Door "C" because it is fragile. Then remove the door assembly.
  • Page 8 Disassembly and Reassembly 4-3-5 Reassembly Test After replacement of the defective component parts of the door, reassemble it and follow the instructions below for proper installation and adjustment so as to prevent an excessive microwave leakage. 1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
  • Page 9 Disassembly and Reassembly 4-6 Replacement of Control Circuit Board 4-6-1 Removal of Control Box Assembly 1. Be sure to ground any static electric charge in your body and never touch the control circuit. 2. Disconnect the connectors from the control Screw circuit board.

  • Page 10: Alignment And Adjustments

    5. Alignment and Adjustments PRECAUTION 1. High voltage is present at the high voltage terminals during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor.

  • Page 11: High Voltage Capacitor

    Alignment and Adjustments 5-4 High Voltage Capacitor 1. Check continuity of the capacitor with the meter set at the highest resistance scale. 2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ. 3.
  • Page 12 Alignment and Adjustments 5-8 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. The output power of the magnetron can be measured by performing a water temperature rise test. Equipment needed : * Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm) * One glass thermometer with mercury column...

  • Page 13: Procedure For Measurement Of Microwave Energy Leakage

    Alignment and Adjustments 5-10 Procedure for Measurement of Microwave Energy Leakage 1) Pour 275±15cc of 20±5˚C(68±9˚F) water in a beaker which is graduated to 600cc, and place the beaker in the center of the oven. 2) Start to operate the oven and measure the leakage by using a microwave energy survey meter.

  • Page 14: Troubleshooting

    6. Troubleshooting PRECAUTION 1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE. 2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT. 3. DISCHARGE THE HIGH VOLTAGE CAPACITOR. 4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON.
  • Page 15 Troubleshooting 6-1 Electrical Malfunction(continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1. Misadjustment or loose wiring Adjust door and latch switches. of primary latch switch 2. Defective primary latch switch Oven can program but timer 1. Open or loose wiring of secondary Adjust door and interlock switches.

  • Page 16: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views M14 M16...

  • Page 17: Main Parts List

    Exploded Views and Parts List 7-2 Main Parts List Ref. No. Parts No. Description Specification Q'ty Remarks DE70-30001A PANEL-OUTER SECC,T0.6,360,1128,EPOXY-COATI DE63-90035G CUSHION-RUBBER DFA20,T2,W190,L100,BLK DE61-50575A BRACKET-UPPER SECC,T0.5,-,-,-,3RD DE47-00001A HEATER 230V,1250W,-,-,SHG-2933E DE60-40009B WASHER-TEFLON SLOT,ID22.2,OD28,T1.2,TEFLON DE63-20017A GASKET-HEATER BRASS,T1.5,OD30.5,ID22.5 DE61-50021A BRACKET-FLANGE SECC1,T0.8,32,32 DE61-50027B BRACKET-HEATER SECC,T1.0,W51,L55,CE945G DE61-50025A BRACKET-EARTH...

  • Page 18: Door Parts List

    Exploded Views and Parts List 7-3 Door Parts List Ref. No. Parts No. Description Specification Q'ty Remarks DE64-40326R DOOR-A ABS(HR0370),-,-,-,WHT,CME 28GT,CE2933T DE64-40328B DOOR-SUB PCABS,-,-,-,BLK,CE2933 DE94-00075B ASSY DOOR-E 3RD-1.0,BLK,COATING DE64-40012A DOOR-C RESIN-PP(TB53),T2.0,CE945GF,BL DE01-00118B FILM-DOOR T0.15,W295,L185,-,-,CE2933 DE64-40006E DOOR-KEY POM(F20-02),-,-,12G,WHT,MW7896W,NO-TALK DE61-70032A SPRING-KEY ES,HSWR,PI0.6,D5.4,L25,MW8640T DE61-80002A HINGE-UPPER SCP1,T2.3,26,77,ZPC3,WHT,CE945...

  • Page 19: Standard Parts List

    Exploded Views and Parts List 7-6 Standard Parts List Parts No. Description Specification Q'ty Remarks DE60-10012A SCREW-TAP TITE TH,+,3,M4,L10,SWR10,ZPC2,TOOTH N-F-EA DE60-10012A SCREW-TAP TITE TH,+,3,M4,L10,SWR10,ZPC2,TOOTH P-C-EA DE60-10012A SCREW-TAP TITE TH,+,3,M4,L10,SWR10,ZPC2,TOOTH S-M-EA DE60-10013A SCREW-ASSY TAP TH,2S,4,L12,MSWR3,ZPC3,FIBER MO/FAN DE60-10018A SCREW-ASSY MACHINE PH,M4X0.7P,8,MSWR10,SN1,WS B/EATH DE60-10024A SCREW-PH PH,+,M4,L8,MSWR10,ZPC3...
  • Page 20 8. P.C.B Diagrams 8-1 P.C.B Diagrams...
  • Page 21 P.C.B Diagrams 8-2 P.C.B Parts List Parts No. Description Specification Q'ty Remarks 3501-001050 RELAY-MINIATURE 24VDC,200mW,5A,1FormA,10mS,5mS RY02,RY03 3501-001062 RELAY-POWER 24VDC,523.2mW,16A,1FormA,15mS RY01 3501-001068 RELAY-POWER 24Vdc,523mW,16A,1FormA,15mS,10 RY04 3601-001126 FUSE-FERRULE 250V,1.6A,FA,CERAMIC,5X20MM FUSE 3708-000528 CONNECTOR-FPC/FC/PIC 13P,2.54mm,STRAIGHT,SN CN05 DE07-10097A V.F.DISPLAY SVM-04SM05,66*33.5*8,RED/GRN,4 VFD1 DE26-20141A TRANS-L.V SLV-945E,230V,50HZ,AC17/2.9V LVT1 DE30-20016A BUZZER CBE2220BA,STICK...

  • Page 22: Schematic Diagrams

    9. Schematic Diagrams 9-1 Schematic Diagrams CONDITION OF OVEN DOOR IS OPENED 1.INPUT : 230V COOK OFF 2.DOOR : OPEN 3.LAMP : ON : P.C.B PATTERN WIRING COLOR : P.C.B IN/OUT POINT BRN : BROWN BLU : BLUE WHT : WHITE ORG : ORANGE RED : RED YEL : YELLOW...

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