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SUPPLEMENT OF
SERVICE MANUAL Microwave Oven EM-C160US
SERVICE MANUAL SUPPLEMENT
for Model EM-C180
SUPPLEMENT OF
Microwave Oven
SERVICE MANUAL Microwave Oven EM-C160US
PRODUCT CODE NO. 437-453-00
See the Service Manual of EM-C180US(SM-640179)
PRODUCT CODE NO. 437-453-00
except the items described in this Service Manual.
See the Service Manual of EM-C180US(SM-640179)
except the items described in this Service Manual.
CAUTION
CAUTION
WARNING TO SERVICE TECHNICIANS
WARNING
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CAUTION For microwave energy emission In the area emitting the highest reading, switch the meter to SLOW RESPONSE and take a reading for On every service call. A check for micro- minimum of three (3) seconds. We recommended the wave energy emission must be made pattern outline shown below when the door surface is according to the following manner. surveyed. NOTE: Periodically check to be sure that the probe tip is not worn or dirty. Measurement of energy emission Measurement must be made with t
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- TABLE OF CONTENTS - Adjustment Procedures............................................. 1 Test Procedures and Troubleshooting...............4•`10 Specifications............................................................ 2 Disassembly Instructions .............................. 11•`14 Power output Measurement ...................................... 2 Exploded View and Parts List ........................ 15•`22 Precautions and Repair Service Tips ....................... 2 Overall Circuit Diagram.
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2.SPECIFICATIONS A. SINCE NEARLY 4,000 VOLTS EXISTS IN SOME CIRCUITS OF THIS MICROWAVE OVEN, RE- Microwave output ................ 1,800W to 180W PAIRS SHOULD BE CARRIED OUT WITH Frequency ........................... 2,450MHz GREAT CARE. Power supply .......................208V, 60Hz B. TO AVOID POSSIBLE EXPOSURE TO MICRO- Rated current ...................... 13 Amp. WAVE ENERGY LEAKAGE, THE FOLLOWING Safety Device ...................... PRECATIONS MUST BE TAKEN BEFORE SER- Thermal protector(M
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6. TEST PROCEDURES AND TROUBLESHOOTING PRIMARY CAUTION WINDINGS -DISCONNECT THE POWER SUPPLY CORD FROM THE WALL Secondary OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT. Windings PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITORS AND REMOVING THE LEAD WIRES ON THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORM- ERS FOR LOWER AND UPPER MAGNETRONS. Filament (SEE FIGURE 3) Windings A. TEST PROCEDURES Figure 3 COMPONENT CHECKOUT PROCEDURE RESULT 1) Check for resistanc
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COMPONENT CHECKOUT PROCEDURE RESULT Measure the resistance: Across two terminals with Normal reading: an ohm-meter on highest scale. Momentarily indicates several ohms, and HIGH-VOLTAGE gradually to 10 meg-ohms. CAPACITOR Abnormal reading: Including internal Indicates continuity or 10 meg-ohms bleeder from the beginning. resistor Figure 7 Measure the resistance: Across two terminals with Normal reading: an ohm-meter on highest scale. Indicate about middle position in one HIGH-VOLTAGE direction
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COMPONENT CHECKOUT PROCEDURE RESULT Measure the resistance between terminals of When When not FPC connector after removing it from Resistance touched touched TOUCH KEY S101.(Figure 10) Value Less than More than BOARD NOTE 1 K ohms 1 meg ohms - When reconnecting the FPC connector, make sure the holes on the connector are properly When checking the POWER key , inserted in hook of the plastic fastener in S101. connect the ohm-meter as illustr
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WARNING: Primary When removing the cabinet, you must disconnect Winding Primary the power supply cord from the wall oulet for your Winding safety. Only the checkout procedure below needs the power supply on. TAKE GREAT CARE to avoid possible electrical shock. For your safety, proceed with the test only after removing the wire leads from the pri- mary winding of the high voltage transformer Lower Upper COMPONENT CHECKOUT PROCEDURE RESULT Normal reading: Check voltage at S104 and S105 after
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B. TROUBLESHOOTING CONDITION TROUBLE CHECK RESULT REMEDY Power with normal voltage is applied. Place Step down Shorted Replace a cup of water inside Transformer microwave oven * “TIME”,”1”,”0” ,”0” Fuse(10A) blows H.V Capacitor Replace Shorted and “START” keys off immediately are touched Connection of FPC from Touch key Incorrect Reconnect board No display Power circuit board Voltage Replace cooking time (See page 7) incorrect Touch key board Resistance Replace (See page 6) i
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CONDITION TROUBLE CHECK RESULT REMEDY Low microwave Magnetron See “HINT” Poor output oscillation on page 10 Gear motor Uneven heating Rotation has Rotation of top or Repair or stopped. bottom antenna replace ° C. ERROR INDICATION The Display will show an error indication for self-diagonosis as follows. “E” means that a service technician is required . “U” means that user can correct the operation. Display Trouble Other Symptom Solution Oven stops
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THERMISTOR CHART Duct 8000 7000 6000 5000 4000 3000 2000 Magnetron 1000 0 Thermistor connector 0 10 2030 4050 60 Temperature “HINT” PROCEDURE FOR DETERMING WHETHER THE UPPER MAGNETRON CIRCUIT OR LOWER MAGNETRON CIRCUIT IS DEFECTIVE. SYMPTOM:One magnetron does not work giving less than normal heat. Caution: Make sure that cabinet (outer wrap) and rear plate are not removed from the oven for your safety. 1.Operate oven as follows. 1)Place a cup of water in the oven 2)Close the door.
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7. DISASSEMBLY INSTRUCTIONS - THE OVEN MUST BE DISCONNECTED FROM THE - If the interlock switch, the relay RL-3 and RL-4 or the ELECTRICAL OUTLET WHEN MAKING REPLACE- interlock monitor switch operate properly, determine MENTS, REPAIRS, ADJUSTMENT OR CONTINUITY which of the following is defective : control circuit board, CHECKS. BEFORE PROCEEDING WITH ANY RE- high voltage transformer, high voltage capacitor, high PAIR, WORK , WAIT AT LEAST 1 MINUTE, UNTIL THE CAPACITOR IN THE HIGH VOLTAGE AREA
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HINT FOR LAMP-CHANGE NOTES Before removing the bulb access panel, pull out - After replacing the door, be sure to check that the the main-plug. Change the faulty bulb and secure interlock switch, the door sensing switch the bulb access panel. Plug the cord back in and and the interlock monitor swich operate normally. check operation. (See pages 1 and 6) - After replacing the door, check for microwave ene- rgy leakage with a leakage detector. Microwave energy leakage must be belo
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K. ADDITIONAL FUNCTIONS The following functions can be completed by the key operation described below. The Accumulative cooking time and the number of door opening /closings can be observed. The Type and level of the buzzer sound can be selected. The “display of remaining cooking time when cooking is temporarily stopped due to door opening” can be selected. The “Accumulative cooking time period” will inform the service technician of the life expectation of the magnetron or other part
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Maintenance: The microwave ovens are designed, manufactured, and tested for years of dependable operation. However, the oven may require service from time to time if the consumable components listed below are not replaced at the appropriate time. For protection from unexpected service calls and undue inconvenience, we recommend that the user has the listed parts replaced at the intervals below, (at customer cost). This will avoid the trouble of repeated service calls after the expiration o
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8. EXPLODED VIEW AND PARTS LIST Main body Parts-1 NOTE: All component have special characteristics for safety and must be replaced using parts listed in this manual. All service on M/W ovens should be performed by a qualified technician using approved testing equipment. Customers should not attempt replace component marked with a symbol. - 17 -
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NOTE: All component have special characteristics for safety and must be replaced using parts listed in this manual. All service on M/W ovens should be performed by a qualified technician using approved testing equipment. Customers should not attempt replace component marked with a symbol. - 18 -
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Main body Parts-2 NOTE: All component have special characteristics for safety and must be replaced usnig parts listed in this manual. All service on M/W ovens should be performed by a qualified technician using approved testing equipment. Customers should not attempt replace component marked with a symbol. - 20 -
