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SERVICE
MICROWAVE OVEN
SEA
MICROWAVE OVEN
BASIC : SMH7178STD
MODEL : SMH7178STE
Manual
1. Precaution
2. Specifications
3. Operating Instructions
4. Disassembly and Reassembly
5. Alignment and Adjustments
6. Troubleshooting
7. Exploded Views and Parts List
8. PCB Diagrams
9. Schematic Diagrams
10. Reference
CONTENTS
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Table of Contents
Related Manuals for Samsung SMH7178STE
Summary of Contents for Samsung SMH7178STE
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Page 1: Microwave Oven
MICROWAVE OVEN BASIC : SMH7178STD MODEL : SMH7178STE SERVICE Manual MICROWAVE OVEN CONTENTS 1. Precaution 2. Specifications 3. Operating Instructions 4. Disassembly and Reassembly 5. Alignment and Adjustments 6. Troubleshooting 7. Exploded Views and Parts List 8. PCB Diagrams 9. Schematic Diagrams... -
Page 2: Table Of Contents
Contents 1. Precaution 1-1 Safety precautions 1-2 Special Servicing Precautions (Continued) 1-3 Special High Voltage Precautions 2. Specifications 2-1 Table of Specifications 3. Operating Instructions 3-1 Control Panel 3-2 Features & External Views 3-3 Accessary 3-4 INSTALLATION 3-4 REUSABLE GREASE FILTERS 4. - Page 3 Contents 7-3 Control & Door Parts List 7-4 Standard Parts List 8. P.C.B Diagrams 8-1 P.C.B Diagrams 8-2 P.C.B Parts List 8-2 P.C.B Parts List(continued) 9. Schematic Diagrams 9-1 Schematic Diagrams 10. Reference 10-1 Model name standard 10-2 Customer inquiry cases and countermeasures 10-2 Customer inquiry cases and countermeasures (Continued)
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Page 4: Exposure To Excessive Microwave Energy
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 (c) Before turning on microwave power for operated with the door open. any service test or inspection within the (b) Make the following safety checks on all microwave generating compartments, ovens to be serviced before activating the... -
Page 5: Precaution
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. -
Page 6: Special Servicing Precautions (Continued)
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. Components that are critical for safety are indicated in the circuit diagram by shading, 19. -
Page 7: Specifications
2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES 99 SECONDS POWER SOURCE 120V 60Hz, AC POWER CONSUMPTION MICROWAVE : 1,650W OUTPUT POWER FROM 100 TO 1100W(10 LEVEL POWER) (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz MAGNETRON OM75P(10)ERHN COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS ”(W) x 15 ”(H) x 15... -
Page 8: Operating Instructions
3. Operating Instructions 3-1 Control Panel 1. Sensor Reheat 2. Power Defrost Sets weight of food to be defrosted. 3. Sensor Cook Buttons p.11 Sensor settings to cook popular foods. 4. Handy Helper, Kids Meals, Snack Bar Selects type of dish to be reheated. 5. -
Page 9: Features & External Views
3-2 Features & External Views Door Ventilation Holes Oven Light Safety Interlock Holes Control Panel Handle Intake Holes Glass Tray Guide Roller Door Latches 758.9mm 398mm - 5 -... -
Page 10: Accessary
3-3 Accessary Glass tray Roller guide ring - 6 -... -
Page 11: Installation
3-4 INSTALLATION The Microwave Oven is supported by a special bracket assembly (mounting system) supplied with the oven. The bracket assembly must be mounted to the wall with toggle bolts through the wall, and a lag screw into a wall stud. After the bracket assembly is installed, the unit can be slid over the two rails of the bracket assembly. -
Page 12: Reusable Grease Filters
3-5 REUSABLE GREASE FILTERS The metal filter trap grease released by foods on Charcoal Filter the cooktop. They also prevent flames from foods on the cooktop from damaging the inside of the microwave. For this reason, the filters must ALWAYS be in place when the hood the vent fan is used. -
Page 13: Disassembly And Reassembly
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). 1. Disconnect all lead wires from the magnetron and lamp. 2. -
Page 14: Replacement Of Door Assembly
4-3 Replacement of Door Assembly 4-3-1 Removal of Door “C” Insert flat screw driver into the gap between Door “A” and Door “C” to remove Door “C”. Be careful when handling Door “C” because it is fragile. Door "A" Then remove the door assembly. Door "C"... -
Page 15: Reassembly Test
4-3-4 Reassembly Test After replacement of the defective component parts of the door, reassemble it and follow the instruc- tions below for proper installation and adjustment so as to prevent an excessive microwave leakage. 1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment. -
Page 16: Replacement Of Stirrer Motor
4-6 Replacement of stirrer motor 1. Disconnect power and remove grille screws(2). 2. Remove grille and the bracket duct upper screw(1). 3. Remove the bracket duct upper and disconnect the stirrer motor wire. 4. Remove stirrer motor screws(1) and lift up stirrer motor after turn left. -
Page 17: Replacement Of Control Circuit Board
4-8 Replacement of Control Circuit Board 4-8-1 Removal of Control Box 1. Disconnect power and remove grille. 2. Remove a screw securing the control box assembly. 3. Be sure to ground any static electric charge in your body and never touch the control circuit. 4. -
Page 18: Alignment And Adjustments
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 dis- charge the high voltage capacitor. -
Page 19: High Voltage Capacitor
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. -
Page 20: Vent Exhaust Blower Motor
5-8 Vent Exhaust Blower Motor THIS COMPONENT REQUIRE REMOVAL OF MICROWAVE OVEN FROM INSTALLATION FOR SERVICING. The blower is a two speed (HI-LO) capacitor run blower assembly located on top of the micro- wave oven. The blower is operated by low voltage relays located on the smart board. -
Page 21: Thermal Cutout(Tco's)
5-9 Thermal Cutout (TCO’S) There are 4 different thermal cutouts in this unit with 4 different purposes. They are : 1. Oven thermal cutout (flame sensor), on cavity top. 2. Hood thermal cutout, inside control area on duct. 3. Bottom thermal cutout, on floor of control area. 4. -
Page 22: Bottom Thermal Cutout
5-9-3 Bottom Thermal Cutout This cutout will protect the touch control from exces- sive heat by turning the vent fan on at low speed. If the HOOD THERMAL CUTOUT surface units of the range are used for long periods of time heat will build up and could damage the micro- wave control. -
Page 23: Magnetron Thermal Cutout
5-9-5 Magnetron Thermal Cutout The magnetron thermal cutout is located above the MAGNETRON THERMAL CUTOUT leads to the magnetrons. It is designed to prevent damage to the magnetron if an overheated condition develops in the tube to cooling fan failure, obstructed air ducts, dirty or blocked air intake. -
Page 24: Output Power Of Magnetron
5-11 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERA- TOR 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... -
Page 25: Procedure For Measurement Of Microwave Energy Leakage
5-12 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. -
Page 26: Troubleshooting
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. -
Page 27: Electrical Malfunction(Continued)
6-1 Electrical Malfunction(continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn 1. Misadjustment or loose wiring Adjust door and latch switches. of primary latch switch 2. Defective primary latch switch Oven can program but timer 1. Open or loose wiring of secondary i Adjust door and interlock switches. -
Page 28: Exploded Views And Parts List
7. Exploded Views and Parts List 7-1 Exploded Views P090 P007 M060 P088 P125 P087 U008 P007 P089 P091 P006 P012 M061 T017 W002 P013 P014 T001 P032 W022 M015 M068 M149 P106 M219 T032 P208 P100 C089 P104 P034 M149 P039 P102... -
Page 29: Main Parts List
M048 DE61-00415A BASE-PLATE SMH7175,SECC,T0.8,-,-,-,- M206 DE96-00269A ASSY-HVC SMH7175,0.91UF HVC M039 2501-001011 C-OIL 910nF,2100V,BK,54x35x75mm,20mm M040 DE61-00115A BRACKET-HVC SMH7175,SECC,T0.6,-,-,-,- M041 DE91-70063D ASSY-HVD HV03-12,MWO-GE,RED W002 DE96-00490A ASSY-WIRE HARNESS A SMH7178STE/XAA,120V/ U001 DE97-00360A ASSY-BASE BOTTOM SMH7175,INCANDESCENT LA M036 4713-001013 LAMP-INCANDESCENT 130V,-,40W,ORG,E17/20, - 25 -... - Page 30 7-2 Main Parts List (S.N.A : SERVICE NOT AVAILABLE) LEVEL Code No. Description Specification Q’ty SA/SNA Remark U003 DE47-00006A HOLDER-LAMP -,250V,75W,250X187 2POLE,OTR U007 DE61-00406B BASE-BOTTOM SMH7175,SECC,T0.5,W354.5,L75 U004 DE61-00407A BRACKET-BOTTOM LAMP SMH7175,SECC,T0.4,-, U012 DE63-00137B COVER-GLASS COOKTOP SMH7175,SECC,T0.5,W9 U005 DE64-00911A GLASS-COOKTOP LAMP SMH7175,TEMP-GLASS,T2 P006 DE97-00363A...
- Page 31 7-2 Main Parts List (S.N.A : SERVICE NOT AVAILABLE) LEVEL Code No. Description Specification Q’ty SA/SNA Remark P102 DE61-00150A BRACKET-BARRIER GR JVM-1860,SECC,T0.5,-, GRILLE P117 DE61-00672A BRACKET-COVER GRILLE SMH7178,SECC,T1.2,W P208 DE64-01296A CHASSIS-GRILLE SMH7178,STS430 #4,T0.5,W7 M035 OM75P(10)ERHN ASSY-MAGNETRON OM75P(10)ERHN - 27 -...
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Page 32: Control & Door Parts List
SMH7178,TEMP-GLASS,T3.2,W D002 DE64-01295A DOOR-A SMH7178,PC,T2.5,L619,W327,-,BLK,- D040 DE64-01299A CHASSIS-DOOR(U) SMH7178,STS430 #4,T0.5,W D041 DE64-01300A CHASSIS-DOOR(L) SMH7178,STS430 #4,T0.5,W C082 DE94-01120D ASSY CONTROL-BOX 120V/60HZ,SMH7178STE/XA C089 DE39-40673A WIRE HARNESS-H 120V60HZ,OTR6 ALL MODEL,G D090 DE63-00289A EARTH-SPRING SMH7178,HSWR,T0.4,OD5,L9.9, C009 DE64-00766B WINDOW-DISPLAY 4150,SAN,T2.0,W37,L84,YEL C001 DE94-01119A ASSY CONTROL-PANEL 120V/60HZ,SMH7178,BLK... -
Page 33: Standard Parts List
7-4 Standard Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No Description Specification Q’ty Remark SA/SNA DE60-20066A BOLT-FLAT UNF1/4,L110,MSWR10,-,-,OTR6,-, DE60-20022A BOLT-TOGGLE MSWR,W3/16X75,-,-,-,-,-,-,- DE60-30015A NUT-FLANGE M5,P0.8,MSWR10,FEFZY,-,-,-,-,- DE60-30063A NUT-MOUNTING -,M6.3,S10C,ZNC,YEL,-,-,-,- DE60-30022A NUT-TOGGLE SBC1,ZPC2,WHT,-,-,-,-,-,- DE60-10082I SCREW-A -,-,-,-,2S-4X12,FEFZY,-,-,-,- ASSY HVC DE60-10082I SCREW-A -,-,-,-,2S-4X12,FEFZY,-,-,-,- BASE PLATE DE60-10082I SCREW-A... -
Page 34: Diagrams
8. P.C.B Diagrams 8-1 P.C.B Diagrams ( This Document can not be used without Samsung’s authorization ) T C O C 09 100nF ZD03 UZ5.1B S B C N05 S MW250-03V _WHT B Z01 C B E 2220B A DS P 1... -
Page 35: Parts List
8-2 P.C.B Parts List (S.N.A : SERVICE NOT AVAILABLE) LEVEL Code No. Description Specification Q’ty Remark 0204-001118 FLUX SV-95-1F,C19H29COOH,C3H7OH,-,1 0401-001002 DIODE-SWITCHING 1N4148M,100V,200mA,DO-34,TP D04~D14,D16~D24, D26~D28 0402-001103 DIODE-RECTIFIER 1T4,400V,1A,SOD-106,TP D01~D03,D15,D25 0403-000355 DIODE-ZENER UZ5.1BSB,5-5.2V,500MW,DO-35,TP ZD01,ZD03~ZD05 0504-001044 TR-DIGITAL KRA226M,PNP,400MW,2.2K/10K,TO-92M,TP TR10 0504-001178 TR-DIGITAL KRC246M,NPN,400mW,2.2K/10Kohm,TO- TR01,TR02,TR05~TR09,T 92M,TP R11~TR17 1201-001125... -
Page 36: Parts List(Continued)
8-2 P.C.B Parts List(continued) (S.N.A : SERVICE NOT AVAILABLE) LEVEL Code No. Description Specification Q’ty Remark 3711-000879 CONNECTOR-HEADER BOX,3P,1R,2.5mm,STRAIGHT,SN CN05 3711-000999 CONNECTOR-HEADER BOX,5P,1R,2.5mm,STRAIGHT,SN CN02 3711-004200 CONNECTOR-HEADER BOX,4P/7P,1R,2.5MM,STRAIGHT,SN,RED CN03 3711-004201 CONNECTOR-HEADER BOX,6P/9P,1R,2.5MM,STRAIGHT,SN CN06 DE07-10035A VF DISPLAY SVM-07SS10,SEA,-,-,- DSP1 DE09-00499A IC MICOM TMP87CM14F-CHUN,SMH7178,64 PIN,+5V,- IC01 ,-,-,-,-,QFP,TRAY,-,-,-20 ~ +85... -
Page 37: Schematic Diagrams
9. Schematic Diagrams 9-1 Schematic Diagrams ( This Document can not be used without Samsung’s authorization ) - 33 -... -
Page 38: Reference
10. Reference 10-1 Model name standard Baoad Distin- Middle Distin- Product Full Nane Classification guisher Classfication guisher Code USA CMO CMO (Counter- USA CMO(EPOXY CAVITY) top MWO) UTC (Under The USA UTC Cabinet) Browner, Grill USA GRILL Convection USA CONVECTION Sensor USA CMO SENSOR DC MWO... -
Page 39: Customer Inquiry Cases And Countermeasures
• Close the door completely. => Press the Cancel but- ton. => Press the Start button. • Contact the nearest Samsung after-sales service cen- ter. Ground • Ground problem may • If the oven is placed in a humid area, buy an electric happen when the oven wire in a store selling electrical products. -
Page 40: Customer Inquiry Cases And Countermeasures (Continued)
Accessory • Visit the nearest Samsung Service Center or local dealer to buy accessories. Before visiting, check the model name printed on the lower right side of the front panel of the oven. - Page 41 © Samsung Electronics Co., Ltd. June 2005 This Service Manual is a property of Samsung Electronics Co.,Ltd. Printed in Korea Any unauthorized use of Manual can be punished under applicable Code No. : DE68- 03949A International and/or domestic law.