MICROWAVE OVEN CK135M / 138FM SERVICE Manual CONTENTS MICROWAVE OVEN 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments Auto 1min+ Auto / GB/F/D/E/I/NL/R /C 6. Troubleshooting Auto 7. Exploded Views and Parts List 8. PCB Diagrams 9.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TOAVOID 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). 2.
Pretaution 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. Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications. A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards. 1-3 Special High Voltage Precautions 1.
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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). Cover Air Thermo S/W Lamp 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.
Disassembly and Reassembly 4-3 Replacement of Fuse 1. Disconnect the oven from the power source. 2. When 15A fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock switch, door sensing switch, monitor switch and power relay. 3. When the above three switches operate properly, check if any other part such as the control circuit board, blower motor or high voltage transformer is defective. 4-4 Replacement of Drive Motor 1.
Disassembly and Reassembly 4-6 Replacement of Control Circuit Board 1. Be sure to disclyarge any static electricity from your body, and avoid touching the "Touch control" clrcuitry. 2. Disconnect the connectors from the control circuit board. 3. Remove screws securing the control circuit bord. 4. Lift up the control circuit board from right side and remove the hooks holding the contol circuit board to the box assembly.
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 5-9 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 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 6-2 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 CK135M/138FM/XEF No. MB01 MB02 MB03 MB04 MB05 MM01 MM03 MM031 MM05 MM06 MM07 MM08 MM09 MM10 MM102 MM14 MM16 MM17 MM18 MM19 MM20 MM21 MM22 MM25 MM27 MM28 MM29 MM30 MM31 MM32 MM33 MM35 MM49 MM52 MM53 MM56 MM57 MM581 MM582 MM59 MM60 MM61 MM62 MM63 MM641 MM642 MM642 MM65 MM66 MM67 MM68 MM69 Code No.
Exploded Views and Parts List 7-2 Main Parts List CK135M/138FM/XEF No. MM71 MM72 MM88 MM91 MM93 MM100 MM103 MM104 MM105 MM106 7-3 Code No. DE61-50490A DE61-50347A DE73-90027A DE74-20025C DE60-60025A DE92-90534A DE67-60074A DE72-80062A DE74-40001A DE74-20022A Description BRACKET-TCO BRACKET-EARTH FERRITE-CORE TRAY-CONVENTION PIN-FOOT ASSY-TRAY BROILER COUPLER-BARBECUE SHAFT-BARBECUE SPIT-BARBECUE TRAY-OIL Specification SECC1,T0.6,34,58,-,-,BSS2-A,T1.0,W35,L43,MBGF45,-,NI-ZN,T13.8,W21.0,L28.
Exploded Views and Parts List 7-3 Door Parts List MD08 MD04 MD06 MD17 MD09 MD02 MD07 MD10 CUSHON DOOR TAPE-DOUBLE FACE MD01 MD15 CK135M/138FM/XEF No. MD01 MD02 MD04 MD06 MD07 MD08 MD09 MD10 MD15 MD17 Code No.
Exploded Views and Parts List 7-4 Control Parts List MC03 MC06 MC10 MC28 MC15 MC07 MC32 MC01 MC13 MC27 MC33 CK135M/138FM/XEF No. MC01 MC01 MC03 MC03 MC06 MC07 MC10 MC13 MC13 MC15 MC27 MC28 MC32 MC33 7-5 Code No.
Exploded Views and Parts List 7-5 Casing Parts List MM74 MM80 MM17 MM76 MM78 MM57 MM75 MM83 MM751 MM81 MM77 MM82 MM100 MM73 CK135M/138FM/XEF No. MM73 MM74 MM75 MM751 MM76 MM77 MM78 MM81 MM82 MM83 MM88 MM93 MM100 MM17 MM57 Code No.
Exploded Views and Parts List 7-6 Standard Parts List CK135M/138FM/XEF Code No.
8. P.C.B Diagrams 8-1 P.C.
P.C.B Diagrams 8-2 P.C.B Parts List CK135M/138FM/XEF Code No.
9. Schematic Diagrams 9-1 Schematic Diagrams MAGNETRON HIGH VOLTAGE DIODE FA TO CHASSIS F RED HIGH VOLTAGE CAPACITOR RED RED H.V.
ELECTRONICS © Samsung Electronics Co., Ltd. Aug 2000 Printed in Korea Code No.
