MICROWAVE OVEN CE305CF 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.
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. All repairs should be done in accordance with the procedures described in this manual. This product complies with Federal Performance Standard 21 CFR Subchapter J (DHHS). 2.
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, or . 19. Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications.
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3. Operating Instructions 3-1 Control Panel OVEN/ °C MICROWAVE MICROWAVE MODE SELECTION CONVECTION MODE/ TEMPERATURE SELECTION POWER LEVEL GRILL GRILL MODE SELECTION MICROWAVE POWER LEVEL SELECTION MW+OVEN AUTO DEFROST COMBINED MODE SELECTION (MICROWAVE+CONVECTION) AUTO REHEAT FEATURE SELECTION MW+GRILL COMBINED MODE SELECTION (MICROWAVE+GRILL) CLOCK CLOCK SETTING AUTO REHEAT/COOK 1. PLATED MEAL 2. CANNED FOOD 3. CASSEROLE / STEW 4. SOUP / SAUCE 5. BOILED POTATOES 6.FRESH VEGETABLES 7. FISH 8.
4. Disassembly and Reassembly 4-1 Replacement of Magnetron, Motor Assembly and Lamp Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which are contained in one assembly). 1. Disconnect all lead wires from the magnetron and lamp. 2. Remove the bracket mounting. 3.Remove the magnetron supporter 4. Remove the air cover. 5. Remove screws securing the magnetron to the wave guide. 6. Take out the magnetron very carefully. 7. Remove screws from the back panel. 8.
Disassembly and Reassembly 4-3 Replacement of Door Assembly 4-3-1 Removal of Door Assembly Remove screws securing the upper hinge and lower hinge. Then remove the door assembly. Upper Hinge Screw Lower Hinge Screw 4-3-2 Removal of Door "C" Insert flat screwdriver into the gap between Door "A" and Door "C" to remove Door "C". Be careful when handling Door "C" because it is fragile.
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. 2.
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 circuit board. Screw 3. Remove screws securing the control box assembly. 4. Remove the screw securing the ground tail of the keyboard. Control Box 4-6-2 Removal of P.C.B Assembly 1.
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. 5-1 High Voltage Transformer 1. Remove connectors from the transformer terminals and check continuity. 2.
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. A shorted capacitor will show continuous continuity. 4. An open capacitor will show constant 9MΩ. 5. Resistance between each terminal and chassis should read infinite. 5-5 High Voltage Diode 1.
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 NOTE: Check line voltage under load.
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. 3) Set survey meter with dual ranges to 2,450MHz. 4) When measuring the leakage, always use the 2 inch spacer cone with the probe. Hold the probe perpendicular to the cabinet door.
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. TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER. 5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC DISCHARGE MAY DAMAGE IT.
Troubleshooting 6-1 Electrical Malfunction(continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1. Misadjustment or loose wiring of primary latch switch 2. Defective primary latch switch Adjust door and latch switches. Oven can program but timer does not start. 1. Open or loose wiring of secondary interlock switch 2. Off-alignment of primary interlock 3. Defective secondary interlock S/W Adjust door and interlock switches. Microwave output is low;.
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Exploded Views and Parts List 7-2 Main Parts List Ref. No. Parts No.
Exploded Views and Parts List 7-2 Main Parts List Ref. No. Parts No.
Exploded Views and Parts List 7-3 Exploded View & Parts List - Door Parts D4 D5 D7 D3 D6 D8 D2 D9 D1 Ref. No. Parts No. Description D1 D2 D3 D4 D5 D6 D7 D8 D9 DE64-40064B DE67-20117B DE92-50080E DE64-40173A DE64-40087H DE61-70030A DE60-60008A DE02-00082A DE92-40094C DOOR-A SCREEN-DOOR(B) ASSY DOOR-E DOOR-C DOOR-KEY SPRING-KEY PIN-HINGE TAPE-DOUBLE FACE ASSY DOOR 7-4 Specification PC,RP-WH-01-K,290G,RE-1300 TEMP,GLASS,T3.2XW278XL423.
Exploded Views and Parts List 7-4 Exploded View & Parts List - Control Parts C7 C3 C4 C2 C1 C6 C5 C8 Ref. No. Parts No.
Exploded Views and Parts List 7-5 Exploded View & Parts List - Casing Parts A8 A5 A6 A7 A4 A2 A9 A3 A1 A10 Ref. No. Parts No. A1 A2 A3 A4 A5 DE60-30016B DE31-30011A DE72-30016A DE62-90045A DE61-50324A NUT-FLANGE FAN-CONVECTION BUSH-MOTOR ADIABATIC-CASING BRACKET-CASING M4,MSWR10,FEFN ALSTAR,T0.6,PI109,RE-1300 MSWR3,D5.6,L11.2,RE-1300,ZPC3 T5,W256,L250,RE-1300 ALSTAR,T0.
Exploded Views and Parts List 7-6 Parts List - Standard Parts Parts No.
8. P.C.B Diagrams 8-1 P.C.
P.C.B Diagrams 8-2 P.C.B Parts List No. Parts No.
9. Schematic Diagrams 9-1 Schematic Diagrams S/W1 S/W2 V/G E H F WHT BLU RY1 2200pF ROT RY4 BRN H.V.T YEL RY5 CM FM DM F2 (0.8A) YEL BLK YEL WHT R BLU YEL WHT F3 (1.6A) RY6 YEL RY2 BLU H.V.D H.V.C S/W5 ORG BLU 0V ORG WHT L ORG ORG E N BLU BRN WHT WHT 1mH 500K WHT 2200pF 230V~ 50Hz S/W3 BRN BRN F1 S/W6 BRN LIN-CAPACITORT 0.1uF L BRN FUSE 10A BRN L.V.T Ass'y chike P.C.
