MICROWAVE OVEN CE281DNR SERVICE MICROWAVE OVEN Manual CONTENTS 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 6. Troubleshooting 7. Exploded Views and Parts List 8.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
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). 11.
1-2 Special Servicing Precautions (Continued) 17. When checking the continuity of the witches 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.
2. Specifications 2-1 Table of Specifications TIMER 60 MINUTES POWER SOURCE 230V 50Hz, AC POWER CONSUMPTION MICROWAVE : 1,300W GRILL : 1100W OUTPUT POWER FROM 100 TO 850W (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75PH(31)ESS COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489(W) x 275(H) x 379(D) SHIPPING DIMENSIONS 557(W) x 329(H) x 403(D) OVEN DIMENSIONS 306(W) x 211(H) x 320(D) SHIPPING WEIGHT APPROX. NET 14.5kg GROSS 16.
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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. 2. 3. 4. 5. 6. 7. 8. Disconnect all lead wires from the magnetron and lamp. Remove a screw securing air cover. Remove the air cover. Remove screws securing the magnetron to the wave guide. Take out the magnetron very carefully. Remove nuts from the back panel. Take out the fan motor.
4-3 Replacement of Door Assembly 4-3-1 Removal of Door "C" Door "A" 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. Then remove the door assembly. Door "C" 4-3-2 Removal of Door "E" Door "E" Following the procedure as shown in the figure, insert and bend a thin metal plate between Door "E" and Door "A" until you hear the ’tick’ sound. - Insertion depth of the thin metal plate should be 0.5mm or less.
4-3-4 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.
4-6 Replacement of Control Circuit Board 4-6-1 Removal of Control Box Assembly 1. Disconnect the connectors from the control box assembly. 2. Remove screws securing the control box assembly. SCREWS 3. Remove the knobs of the control box A’ssy. 4. Remove the screw securing the timer.
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. Normal resistance readings are as follows: Secondary Approx.
5-3 High Voltage Capacitor 1. 2. 3. 4. 5. Check continuity of the capacitor with the meter set at the highest resistance scale. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9M. A shorted capacitor will show continuous continuity. An open capacitor will show constant 9M . Resistance between each terminal and chassis should read infinite. 5-4 High Voltage Diode 1. Isolate the diode from the circuit by disconnecting its leads. 2.
5-7 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. Low voltage will lower the magnetron output.
5-9 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 WARNING FOR HIGH VOLTAGE 4000 VOLTS EXIST AT THE HIGH VOLTAGE AREA. DO NOT OPERATE THE OVEN WITH CABINET PARTS REMOVED. DO NOT REMOVE THE CABINET PARTS IF THE POWER SUPPLY CORD IS PLUGGED IN THE WALL OUTLET. UNPLUG THE POWER CORD BEFORE SERVICING. 6-1 Electrical Malfunction Parts Fuse blows out when door is opened. Fuse is Open Oven lamp does not light. Fan does not operate. Cause Diagnosis Remedy Defective primary interlock switch are winding.
6-1 Electrical Malfunction(continued) part Cause 1) Too small a load Diagnosis If a small amount of food is heated for a long time, period of microwave may turn off during operation. Microwave turns off during cooking cycle. Remedy To increase the oven water into water into the oven. 2)Defective magnetron Check to see if the magnetron thermal cutout switch Replace thermal cutout thermal is activated at a temperature higher than 150 . switch. cutout S/W properly shock is felt.
6-2 Unsatisfactory Cooking Parts Cause 1) Open cathode of magnetron Diagnosis Check the terminals with a multimeter to see if the heater circuit is open. Remedy Replace magnetron. Check the H. V. Diode for continuity in the reverse and 2) Defective H. V. Diode normal directions using megger. If there is continuity in the reverse direction, the H. V. Diode may be faulty. Replace H. V. Diode. (In this event H. V.
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7-2 Main Parts List No. Code No. MB01 DE96-00120B ASSY BODY LATCH Description M1717N,NC2000(HANDLE) Specification Q’ty 1 MB02 3405-001032 SWITCH-MICRO 125/250VAC,16A,200GF,SPDT 1 MB03 3405-001034 SWITCH-MICRO 125/250VAC,16A,200GF,SPST-N 2 MB041 DE66-00093A LEVER-SWITCH(A) NC2000,PP-TH53,-,-,-,-,N 1 MB042 DE66-00094A LEVER-SWITCH(B) NC2000,PP-TH53,-,-,-,-,N 1 MB05 DE72-00137A LATCH-BODY NC2000(0.6/0.8/1.2),PP,-,-,-, 1 MM01 DE70-00184P PANEL-OUTER MW850WA,C/STEEL,T0.
7-3 Control & Door Parts List No. Code No.
7-4 Standard Parts List Code No. Description Specification Q’ty Remark DE60-30016A NUT-FLANGE M4,MSWR10,-,-,-,-,-,-,- 2 F-MOTOR DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 4 OUT-PANEL DE60-10018A SCREW-ASSY MACHINE -,WS,MSWR10,SN1,PH,M4X0.
8. Schematic Diagrams 8-1 Schematic Diagrams CONDITION OF OVEN WIRING COLOR DOOR IS OPENED BRN : BROWN WHT : WHITE RED : RED BLK : BLACK COOK OFF Y/G : YELLOW GREEN BLU : BLUE ORG : ORANGE YEL : YELLOW MAGNETRON HIGH VOLTAGE DIODE FA TO CHASSIS F HIGH VOLTAGE CAPACITOR RED RED RED H.V.
