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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
EM-C1800MK
EM-C1800MK
Model No
Pro.Code No
EM-C1800MKSD
437 477 00
EM-C1800MKUK
437 477 01
REFERENCE NO. SM-640177
(Germany)
(U.K)
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Summary of Contents for Sanyo EM-C1800MK
- Page 1 SERVICE MANUAL EM-C1800MK Microwave Oven (Germany) EM-C1800MK (U.K) Model No Pro.Code No EM-C1800MKSD 437 477 00 EM-C1800MKUK 437 477 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.
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Page 2: Table Of Contents
- TABLE OF CONTENTS - Adjustment Procedures ..........1 Test Procedures and Troubleshooting....4 •`9 Specifications ............2 Disassembly Instructions ......10 •`12 Power output Measurement ........2 Exploded View and Parts List ......13 •`20 Precautions and Repair Service Tips ....... 2 Overall Circuit Diagram.........21 •`23 Circuit Diagram ............ -
Page 3: Specifications
2.SPECIFICATIONS (1) Before the power is applied. (a) Open and close door several times to make Microwave output ....1,800W to 180W sure the door interlock switch and interlock Frequency ......2,450MHz monitor switch operation properly. Power supply ....... 230V, 50Hz (Listen for the clicking sound from switches.) Rated current ...... -
Page 4: Circuit Diagram
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Page 5: Caution
6. TEST PROCEDURES AND TROUBLESHOOTING Primary Secondary CAUTION windings Windings -DISCONNECT THE POWER SUPPLY CORD FROM THE WAL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT. PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES ON THE PRIMARY WINDING OF THE HIGH Filament VOLTAGE TRANSFOREMER. - 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 Indicates continuity or 10 meg-ohms bleeder from the beginning. resistor Measure the resistance: Across two terminals with Normal reading:...
- Page 7 COMPONENT CHECKOUT PROCEDURE RESULT Check each voltage at connector S104 and S105 Normal reading: after removing each connector (female) from power POWER circuit board. Connection P.C.B Pin No.3 (Ground) and 4,5, 1,2 at S105. Pin No., Voltage(V) Pin No.1 and 2 at S104. S105 #3 to #4 DC 12...
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- Page 9 B. TROUBLESHOOTING CONDITION TROUBLE CHECK RESULT REMEDY Connection of Power is applied with Poor Contact Reconnect S110 to S107 normal voltage Timer is set No display Power circuit board Voltage Replace Touch Select key cooking time (See page 6) incorrect Control circuit Voltage Replace...
- Page 10 CONDITION TROUBLE CHECK RESULT REMEDY H.V Transformer Shorted Replace H.V Capacitor Shorted Replace Magnetron Shorted Replace H.V Diode Shorted Replace Fuse Diode Shorted Replace Low microwave Poor Magnetron Replace output oscillation Rotation of top or Rotation Repair or Uneven heating bottom anttena stop replace...
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Page 11: Disassembly Instructions
7. DISASSEMBLY INSTRUCTIONS - OVEN MUST BE DISCONNECTED FROM ELEC- - If the primary interlock switch, the relay 3 and 4 or TRICAL OUTLET WHEN MAKING REPLACEMENTS, the interlock monitor switch operate properly, deter- REPAIRS, ADJUSTMENT AND CONTINUITY mine which of the followings is defective : control cir- CHECKS BEFORE PROCEEDING WITH ANY RE- cuit board, blower motor, gear motor, high voltage trans- PAIR WORK AFTER DISCONNECTING, WAIT AT... - Page 12 F. CHANGING POWERSUPPLY CORD H.REMOVING DOOR (See exploded view on page 15) Remove 2 hex nuts securing the upper hinge, (1) Unfasten 1 screw for earth and pull out 2 wires remove 3 hex nuts securing the lower hinge and of power cord from terminal plate.
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Page 14: Exploded View And Parts List
8. EXPLODED VIEW AND PARTS LIST Main body Parts-1 Parts marked with this sign have special Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 13 -... - Page 15 Parts marked with this sign are supplied with high voltage exceeding 250V Parts marked with this sign have special Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 14 -...
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- Page 17 Main body Parts-2 Parts marked with this sign are supplied with high voltage exceeding 250V Parts marked with this sign have special Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 16 -...
- Page 18 Parts marked with this sign are supplied with high voltage exceeding 250V Parts marked with this sign have special Characterstics important for microwave leakage. When replacing any of these parts use only Manufacturers specified parts. - 17 -...
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