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SERVICE MANUAL
Read this manual carefully, especially precaution on microwave energy, and follow the procedure strictly,
careless servicing and testing may expose yourself to the microwave energy leakage.
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.
(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.
Microwave Oven
Foreword
PRECAUTIONS
FILE NO.
EM-C2001UK
EM-C2001SD
Model No
Pro.Code No
EM-C2001SD
437 508 00
EM-C2001UK
437 508 01
REFERENCE NO.
SM-6410003-00
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Summary of Contents for Sanyo EM-C2001UK
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Page 1: Microwave Oven
FILE NO. SERVICE MANUAL EM-C2001UK Microwave Oven EM-C2001SD Model No Pro.Code No EM-C2001SD 437 508 00 EM-C2001UK 437 508 01 Foreword Read this manual carefully, especially precaution on microwave energy, and follow the procedure strictly, careless servicing and testing may expose yourself to the microwave energy leakage. -
Page 2: Table Of Contents
- TABLE OF CONTENTS - Adjustment Procedures ..........1 Test Procedures and Troubleshooting....4-10 Specifications ............2 Disassembly Instructions......11-15 Power output Measurement ........2 Exploded View and Parts List1......16-22 Precautions and Repair Service Tips ....... 2 Overall Circuit Diagram......... 23-25 Circuit Diagram ............ -
Page 3: Specifications
2.SPECIFICATIONS A. SINCE NEARLY 4,000 VOLTS EXISTS IN SOME CIRCUITS OF THIS MICROWAVE OVEN, RE- Microwave output ....1,900W,950W,190W PAIRS SHOULD BE CARRIED OUT WITH Frequency ......2,450MHz GREAT CARE. Power supply ....... 220-230V, 50Hz B. TO AVOID POSSIBLE EXPOSURE TO MICRO- Rated current ...... -
Page 4: Circuit Diagram
5.CIRCUIT DIAGRAM Figure 3 * Caution: The voltage between filament leads of magnetron is about 3.3VA.C, but the filament carries 4KV/DC high voltage with respect to ground.Never touch these leads with bare hand during operation. - 3 -... -
Page 5: Caution
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 6 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 7 COMPONENT CHECKOUT PROCEDURE RESULT Measure the resistance between terminals of When When not 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 8 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 9 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 “ ”keys off immediately are touched Connection of FPC from Touch key...
- Page 10 CONDITION TROUBLE CHECK RESULT REMEDY Low microwave Magnetron See “HINT” Poor output oscillation on page 10 Stirrer Repair or Uneven heating Rotation of Rotation has Replce of stopped. stirrer Blower motor C. ERROR INDICATION The Display will show an error indication for self-diagonosis as follows. “E”...
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Page 11: Disassembly Instructions
THERMISTOR CHART Duct Magnetron ‘’HINT’’ PROCEDURE FOR DETERMING WHETHER THE FRONT MAGNETRON CIRCUIT OR REAR MAGNTRON 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 follws. - Page 12 G.REMOVING TOUCH KEY BOARD C.REMOVING LATCH INTERLOCK SWITCH (1) Remove the FPC connector from the connector (See Figure on page 1) S101 while pushing up the end of the plastic fastner. (1) Disconnect all lead wires from the latch (2) Remove the control plate which is held on the interlock switch .
- Page 13 NOTES HOW TO RESET THE MEMORY OF - When removing the magnetron, make sure that its ACCUMULATIVE COOKING TIME: dome does not hit any adjacent parts, or it may be Note; Total number of door operation can not be damaged. cleared.
- 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 O.ADDITIONAL FUNCTIONS CHECKING ACCUMULA TIVE COOKING TIME, NUMBER OF DOOR OPERA TIONS AND CONTROL OF THE BUZZER SOUND Display shows accumulative cooking time or the number of door operations by key operation. Also, you can change any remaining cooking time, buzzer sound or buzzer volume.
- 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 List1
8. EXPLODED VIEW AND PARTS LIST Main body Parts-1 Parts marked with this sign are supplied with Parts marked with this sign have special high voltage exceeding 250V Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - Page 18 - 17 -...
- Page 19 Main body Parts-2 Parts marked with this sign are supplied with Parts marked with this sign have special high voltage exceeding 250V Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 18 -...
- Page 20 - 19 -...
- Page 21 Microwave Parts Parts marked with this sign are supplied with Parts marked with this sign have special high voltage exceeding 250V Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 20 -...
- Page 22 - 21 -...
- Page 23 Door Parts - 22 -...
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Page 24: Overall Circuit Diagram
- 23 -... - Page 25 - 24 -...
- Page 26 9. OVERALL CIRCUIT DIAGRAM - 25 -...
- Page 27 - 26 -...
- Page 28 CONTROL CIRCUIT BOARD Figure 16 Sep./99 Printed in JAPAN - 27 -...