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Samsung SMH7177STE Service Manual
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Samsung SMH7177STE Service Manual

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MICROWAVE OVEN

SMH7177STE
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
10. Reference
SEA

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Summary of Contents for Samsung SMH7177STE

  • Page 1: Microwave Oven

    MICROWAVE OVEN SMH7177STE 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 10. Reference...

  • Page 2: Table Of Contents

    Contents 1. Precaution ....................1 1-1 Safety precautions .

  • Page 3: 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 4: 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 5: Special Servicing Precautions (Continued)

    1-2 Special Servicing Precautions (Continued) 16. Always connect a test instrument’s ground lead 19. Use replacement components that have the to the instrument chassis ground before con- same ratings, especially for flame resistance and necting the positive lead; always remove the dielectric strength specifications.

  • Page 6: Specifications

    2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES 99 SECONDS POWER SOURCE 120VAC 60Hz 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 OVEN CAVITY DIMENSIONS ”(W) x 10 ”(H) x 14...

  • Page 7: Operating Instructions

    3. Operating Instructions 3-1 Control Panel 1. Sensor Reheat 10. Turntable On/Off Button 2. Power Defrost 11. One Minute + 3. Sensor Cook Buttons 12. My Choice 4. Handy Helper, Kids Meals, Snack Bar 13. Custom Cook 5. More/Less 14. Start 6.

  • Page 8: Features & External Views

    3-2 Features & External Views Grill Door Ventilation Holes Oven Light Safety Interlock Holes Control Panel Handle Intake Holes Glass Tray Guide Roller Door Key 758.8mm 410.3mm - 5 -...

  • Page 9: Accessory

    3-3 Accessory Depending on the model that you have purchased, you are supplied with several accessories that can be used in a variety of ways. Registration Card Top Template Wall Template Installation Owner’s Manual Hardware-Kit Instructions Glass Tray Roller Guide Ring Exhaust Adaptor Shelf Charcoal Filter...

  • Page 10: 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 11: 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 12: Disassembly And Reassembly

    4. Disassembly and Reassembly MAGNETRON, MOTOR ASSEMBLY, VENT BLOWER AND HIGH VOLTAGE TRANSFORMER Oven must be removed from wall. REMOVING OVEN FROM WALL (2 PEOPLE REQUIRED) Oven is hooked on metal tabs at bottom of wall mounting plate and to cabinet by (3) top cabinet bolts. 4-1 Replacement of High Voltage Transformer and Fan Motor Assembly.

  • Page 13: Replacement Of Door Assembly

    4-3 Replacement of Door Assembly 4-3-1 Removal of Door “C” Open the door and remove the door by pulling up from hinge holes. Door "A" Door "C" Door “E” 4-3-2 Removal of Door “E” Following the procedure as shown in the figure, insert and bend a thin metal plate between Door “E”...

  • Page 14: 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 15: 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 16: 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 17: 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 18: 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 19: 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 20: 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 21: 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 22: 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 23: 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 24: 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 25: 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 26 6-1 Electrical Malfunction(continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor 1. Misadjustment or loose wiring of pri- Adjust door and latch switches. turn on mary latch switch 2. Defective primary latch switch Oven can program but 1. Open or loose wiring of secondary Adjust door and interlock switches.

  • Page 27: Error Code Numbering Rule

    6-2 Error Code Numbering Rule 1. ERROR CODE NUMBERING RULE is applied to a microwave oven and an oven.(CMO, OTR, Grill, Convection, Commercial etc.) 2. All sensors and devices have their own number. ex) Gas Sensor = 1, Temp. Sensor = 2, ... 3.
  • Page 28 6-2 Error Code Numbering Rule(continued) Error Code List Gas Sensor Error Code Gas Sensor Error Case (E-1X) E-11 Open E-12 Short E-13 T1 Max Time Error E-14 Dry Up / No Load Temp Sensor Error Code Temp. Sensor Error Case (E-2X) E-21 Open E-22...
  • Page 29 6-2 Error Code Numbering Rule(continued) Eeprom Error Error Code EEPROM Error Case (E-5X) E-51 Open (Sense Failure) E-53 Read/Write Error E-54 Zero not to be set Humidity Sensor Error Code Humidity Sensor Error Case (E-6X) E-61 Open E-62 Short E-63 T1 Max Time Error Others Error Code...

  • Page 30: Exploded Views And Parts List

    7. Exploded Views and Parts List 7-1 Exploded Views P007 M060 P125 U008 P007 P006 P012 M061 T017 W002 P013 P014 T001 P032 P034 P097 P101 M015 M068 M149 P106 M219 T030 P208 P100 C089 P104 T032 M149 P039 P102 W023 P178 P124...

  • Page 31: Main Parts List

    7-2 Main Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark M036 4713-001013 LAMP-INCANDESCENT 130V,-,40W,ORG,E17/20, ASSY DUCT UPPER M038 DE26-00082D TRANS H.V SHV-U1870B,120V,60HZ,2460/ 2220 M024 DE31-00029B MOTOR VENTILATION SMV-460UA-1,SMH7175WE/ M049 DE31-10172A MOTOR-SYNCHRONOUS M2HJ24Z709,ST-16F,21V, M050 DE31-10173A MOTOR-SYNCHRONOUS M2HJ29A709,ST-16F,21V,...

  • Page 32: Standard Parts List

    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 33 7-2 Main Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark P104 DE61-00177A HINGE-GRILLE(M) JVM-3660,SECC,T1.6,-,-,- GRILLE M149 DE61-00527A SPRING-LOUVER JVM-2070,HSWR,-,-,-,-,-,-, P106 DE63-00244A EARTH-GRILLE SMV9165,STS301,T0.15,W13.5, GRILLE M068 DE64-01294A GRILLE SMH7178,PC,T2.5,W75,L757,- ,BLK,- P101 DE97-00497A ASSY-COVER GRILLE SMH7178,CHASSIS+BKT-C/ P102 DE61-00150A...

  • Page 34: Control & Door Parts List

    7-3 Control & Door Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark D049 DE94-01118C ASSY DOOR SMH7176STE/XAA,BLACK,- D060 6107-001175 SPRING-ES HSWR,BLUING,PI0.95,D8.5,L4 9.4, D005 DE01-00127A FILM-DOOR JVM-1860,POLYESTER,- ,L479,T0.0 D006 DE64-00759A DOOR-C SMH7175,PP,T1.5,-,-,-,BLK,- D011 DE64-00760A KEY-DOOR SMH7175,PBT,-,-,BLK,-,- D019...
  • Page 35 7-4 Standard Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark 6002-000643 SCREW-TAPPING TH,+,2S,M4,L10,ZPC(YEL),SW CAVITY FRONT 6002-001170 SCREW-TAPPING FH,STAR,2,M4,L12,SIL,SWRCH B/D-LATCH 6002-001173 SCREW-TAPPING FH,+,2S,M4,L12,ZPC(BLK),MS P/OUTER 6006-001170 SCREW-ASSY TAPP WS,TH,+,M4,L10,ZPC(YEL) P-CORD 6006-001175 SCREW-ASSY TAPP WS,TH,+,M4,L8,ZPC(YEL) ASSY HVD DE60-10045A SCREW-TAP PH -,-,FEFZY,-,PH,M3,-,L6,-,-...

  • Page 36: Diagrams

    8. P.C.B Diagrams 8-1 P.C.B Diagrams ( This Document can not be used without Samsung’s authorization ) SMW250-07AV_RED CN02 ZD01 ZMM55CV1 MM4148 MM4148 MM4148 MM4148 MM4148 MM4148 MM4148 MM4148 DSP1 SVM-07SS25 - 33 -...

  • Page 37: P.c.b Parts List

    8-2 P.C.B Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark RAS-OTR7HV-04 ASSY PCB PARTS SMH7178,120V/60HZ 2011-000777 R-NETWORK 47Kohm,5%,1/8W,A,SIP,8P,TP AR01 3501-000256 RELAY-POWER 110V,1200VA,10000MA,-,10MS,1 RY04 3501-001155 RELAY-MINIATURE 24VDC,200MW,3000MA,1FORM RY11 3708-001550 CONNECTOR-FPC/FC/PIC 16P,1.25mm,STRAIGHT CN01 3711-000024 CONNECTOR-HEADER BOX,3P,1R,2.5mm,STRAIGH CN04 3711-000879...
  • Page 38 8-2 P.C.B Parts List (S.N.A : SERVICE NOT AVAILABLE) Level Code No. Description Specification Q’ty SA/SNA Remark 2401-002075 C-AL 4.7uF,20%,50V,GP,TP,5x11,5 2802-000188 RESONATOR-CERAMIC 8MHz,0.5%,TP,10.0x5.0x XTL1 DE09-00499A IC MICOM TMP87CM14F-CHUN,SMH7178,64 PIN, IC01 DE39-60001A WIRE-SO COPPER PI0.5,SN,T,52MM,TAPING_WI DE41-00309A PCB-MAIN RAS-OTR7HV,FR-1,1,-,T1.6,197*19 1203-001037 IC-VOLTAGE REGULATOR 78L05,SOT-89,3P,185 IC05 2401-002216...

  • Page 39: Schematic Diagrams

    9. Schematic Diagrams 9-1 Schematic Diagrams ( This Document can not be used without Samsung’s authorization ) - 36 -...

  • Page 40: Reference

    10. Reference 10-1 Model name standard Baoad Distin- Middle Distin- Product Full Nane Classification guisher Classfication guisher Code CMO (Counter- USA CMO 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 41: Customer Inquiry Cases And Countermeasures

    • Close the door completely. => Press the Cancel button. => Press the Start button. • Contact the nearest Samsung after-sales service center. • Ground problem may • If the oven is placed in a humid area, buy an electric...
  • Page 42 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 43 © Samsung Electronics Co., Ltd. July 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. : DE68-03934A International and/or domestic law.

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