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SERVICE MANUAL
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE TO
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary:
(1)Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other
damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e)(i) A microwave leakage check to verify compliance with the Federal performance standard should be
performed on each oven prior to release to the owner. (For U.S.A)
(e)(ii) A microwave leakage check to verify compliance with the Canadian Regulation, HEALTH AND WELFARE,
SOR/79-920 should be performed on each oven prior to release to the owner. (For CANADA)
Microwave Oven
WARNING TO SERVICE TECHNICIANS
EXCESSIVE MICROWAVE ENERGY
CAUTION
EM-C180US
PRODUCT CODE NO. 437-452-00
REFERENCE NO.SM-640179
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Summary of Contents for Sanyo EM-C180US
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Page 1: Warning To Service Technicians
SERVICE MANUAL EM-C180US Microwave Oven PRODUCT CODE NO. 437-452-00 CAUTION WARNING TO SERVICE TECHNICIANS 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. - Page 2 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.
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Page 3: Table Of Contents
- 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.........23 •`25 Circuit Diagram ............ -
Page 4: Specifications
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 ...... -
Page 6: Test Procedures And Troubleshooting
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. - Page 7 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...
- Page 8 COMPONENT CHECKOUT PROCEDURE RESULT When When not Measure the resistance between terminals of F P C c o n n e c t o r a f t e r r e m o v i n g i t f r o m Resistance touched touched TOUCH KEY...
- Page 9 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...
- Page 10 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 Replace H.V Capacitor Shorted and “START” keys off immediately are touched Connection of FPC from Touch key...
- Page 11 CONDITION TROUBLE CHECK RESULT REMEDY Low microwave Magnetron See “HINT” Poor output on page 10 oscillation 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”...
- Page 12 THERMISTOR CHART Duct 8000 7000 6000 5000 4000 3000 2000 Magnetron 1000 Thermistor connector Temperature Ž “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.
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Page 13: Disassembly Instructions
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. - Page 14 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.
- Page 15 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”...
- Page 16 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).
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Page 17: Exploded View And Parts List
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. - Page 18 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.
- Page 20 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.
- Page 21 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.
- Page 28 Wiring of High voltage Circuit Upper Magnetron Red wire Lower Magnetron BACK BACK BACK BACK BACK Red wire Filament Winding Black Pink/Light Blue Red wire Lower Transformer Blue/Blue Filament Winding Brown Wiring of Switches FRONT FRONT FRONT FRONT FRONT Upper Transformer Red wire Monitor switch...