Samsung SMH7159BC Service Manual Download Page 32 | Manualshive

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9. Schematic Diagrams

9-1 Schematic Diagram

S ( This Document can not be used without Samsung's authorization )

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Summary of Contents for SMH7159BC

Page 1: ...OVEN 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Trouble shooting 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams Manual SMH7159WC SMH7159BC SMH7159CC SEA ...

Page 2: ...s 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 s...

Page 3: ...ung Electronics America Inc Headquarters 105 Challenger Road Ridge field Pack New Jersey 07660 0511 10 Service technicians should remove their watches while repairing an MWO 11 To avoid any possible radiation hazard replace parts in accordance with the wiring diagram Also use only the exact replacements for the following parts Primary and secondary interlock switches interlock monitor switch 12 If...

Page 4: ... capacitor to the oven chassis Use a screwdriver 3 High voltage is maintained within specified limits by close tolerance safety related components and adjustments If the high voltage exceeds the specified limits check each of the special components PRECAUTION There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH VOLTAGE TRANSFORMER secondary and filament ...

Page 5: ...POWER OPERATING FREQUENCY MAGNETRON COOLING METHOD OUTSIDE DIMENSIONS NET WEIGHT SHIPPING WEIGHT 99 MINUTES 99 SECONDS 120V 60Hz AC MICROWAVE 1 580W FROM 100 TO 1000W 10 LEVEL POWER IEC 705 TEST PROCEDURE 2 450MHz OM75PH 10 ESS COOLING FAN MOTOR 297 8 W x 167 8 H x 151 16 D mm 69 5 lbs 76 lbs ...

Page 6: ...structions 3 1 Control Panel 3 2 Features External Views Door Door Latches Handle Ventilation Holes Oven Light Safety Interlock Holes Control Panel Auto Side Hood Intake Holes Glass Tray Guide Roller 382 5mm 759mm 429mm ...

Page 7: ...annot be installed to cabinet arrangements such as an island or peninsula It must be mounted to both a top cabinet and wall VENT BLOWER The vent or exhaust blower is located at the top of the oven It is shipped for vertical exhaust but can be changed to rear exhaust or recirculating See installation instrustions on how to change and or blower section on how to remove COOKTOP LIGHTS Two 40 watt scr...

Page 8: ...t If you have turned the fan on you may find that you cannot turn it The fan will automatically turn off when the internal parts are cool If may stay on for 30 minutes or more after the cooktop and microwave controls are turned off GRILLE REMOVAL The top full width grille is removable for service to some components such as oven light cavity T C O vent motor capacitor and fuse TO REMOVE GRILLE 1 Di...

Page 9: ...ews from the H V Trans 8 Take out the H V Trans 4 2 Replacement of Magnetron 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 2 Remove nuts 4 securing the magnetron to the wave guide 3 Take out the magnetron very carefully NOTE1 When removing the magnetron make sure t...

Page 10: ...val of Door E Following the procedure as shown in the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound Insertion depth of the thin metal plate should be 0 5mm or less 4 3 3 Removal of Key Door Spring Remove pin hinge from Door E Detach spring from Door E and key door Door E Door A Door C ...

Page 11: ...failure replace the primary interlock switch secondary interlock switch door sensing switch interlock monitor switch and power relay 4 When the above four switches operate properly check if any other part such as the control circuit board blower motor or high voltage transformer is defective 4 5 Replacement of Drive Motor 1 Disconnect power and remove base hood screws 4 2 Remove bottom plate and d...

Page 12: ...ll the stirrer motor 4 7 Removal of stirrer The stirrer is motor driver and located on the upper side of the cavity The oven uses a top feed wave guide The stirrer is located in the wave guide and the motor is located on the wave guide 1 Disconnect power and open the door 2 Remove the clip and turn the stirrer cover left 3 Remove stirrer cover and the stirrer will come with it STIRRER MOTOR COVER ...

Page 13: ...n reconnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 4 8 3 Removal of Window Display Membrane Panel 1 Window display should not be disassembled as its mounting tabs will be broken If repair work is difficult replace with Ass y control panel 2 The membrane key board is attached to the escutcheon base with double faced...

Page 14: ...magnetron 2 Isolate the magnetron from the circuit by disconnecting its leads 3 A continuity check across the magnetron filament terminals should indicate one ohm or less 4 A continuity check between each filament terminal and magnetron case should read open PRECAUTION 1 High voltage is present at the high voltage terminals during any cook cycle 2 It is neither necessary nor advisable to attempt m...

Page 15: ...tch 1 When mounting Primary switch and Interlock Monitor switch to Latch Body consult the figure 2 No specific adjustment during installation of Primary switch and Monitor switch to the latch body is necessary 3 Completely tighten the screws holding the Latch Body to the oven assembly Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustme...

Page 16: ...lower TO TEST THE CAPACITOR 1 Remove grille discharge capacitor and disconnect one capacitor lead 2 Make appropriate capacitor check with analog meter needle should rise then fall cap is charging then discharging TO TEST BLOWER WINDINGS 1 Disconnect power and remove grille 2 Open control panel and discharfe capacitor 3 Disconnent two wires to run capacitor Continuity test across the two wires shou...

Page 17: ... Hood Thermal Cutout This cutout will protect the touch control from excessive heat by turning the vent fan on at low speed If the surface units of the range are used for long periods of time heat will build up and could damage the microwave control In order to prevent this a thermal cutout is installed on the duct behind the control This cutout will close 158O F 70O C vent fan energized and open ...

Page 18: ...ntrol box assembly 3 Remove two wire leads and unscrews one screw capturing cutout on base plate 5 9 4 Magnetron Thermal Cutout The magnetron thermal cutout is located above the 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 Under normal operation the m...

Page 19: ...OOKING TEST 1 Place 1 3 cup tap water in oven 2 Touch potato the oven starts immediately 3 Control Beeps and Shuts off 4 Touch Pause Cancel 1 Test OK Normal 2 Test Fails Check Sensor See Sensor Test Below SENSOR TEST QUICK TEST 1 With 2 fingers touch and hold the following pads at the same time Auto Defrost and Sensor Reheat 2 Observe diagnostic number in display Numbers approximate 15 185 Normal ...

Page 20: ... stir the water again with the thermometer and measure the temperature T2 5 Subtract T1 from T2 This will give you the water temperature rise T 6 The output power is obtained by the following formula Output Power 4 187 x 1000 x T 0 55 x Mc x T2 T1 44 Heating Time sec 41 3 seconds included as a holding time of magnetron oscillation 4 187 Coefficient for Water 1000 Water cc T Temperature Rise T1 T2 ...

Page 21: ...anges to 2 450MHz 5 Using the survey meter and spacer cone as described above measure near the opening of magnetron the surface of the air guide and the surface of the wave guide as shown in the following photo but avoid the high voltage components The reading should be less than 4mW cm2 5 14 Note on Measurement 1 Do not exceed the limited scale 2 The test probe must be held on the grip of the han...

Page 22: ...nsformer NOTE2 Check adjustment of primary interlock monitor power relay door sensing switch NOTE 1 All of these switches must be replaced at the same time refer to adjustment instructions Check continuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When H V Transformer is replaced check diode and magnetron also Oven does not accept key input Program 1 Key inpu...

Page 23: ...be heard 1 Loose fan and fan motor 2 Loose screws on H V Transformer 3 Shorted H V Diode Tighten screws of fan motor Tighten screws of H V Transformer Replace H V Diode Turntable and stirrer motor does not rotate 1 Open or loose wiring of turntable and stirrer motor 2 Defective turntable and stirrer motor Replace turntable motor Replace stirrer motor Oven stops operation during cooking 1 Open or l...

Page 24: ...03 M019 M049 M034 P093 P180 P181 C081 M059 M059 M068 M087 P001 M069 P059 M029 M035 M015 M020 M001 P032 P004 P006 M024 P002 P012 M050 M036 M030 P037 P016 M061 P003 P024 P025 P036 P039 P030 P031 T017 U001 H040 H041 H039 U008 U005 U004 U002 U003 U012 H025 H033 H027 H032 T001 M060 M032 W003 H030 T033 H039 H042 H038 H036 H031 H035 W002 ...

Page 25: ...GRY COATING 1 H041 DE97 00447C ASSY FRAME R SMH7159WC GRY COAT 1 H042 DE97 00463B ASSY TOP PLATE SUB SMH7159WC WHT COAT 1 M001 DE64 01040B PANEL OUTER SMH7159WC SECC T0 5 0 2 WHT 1 M015 DE39 10102A ASSY POWER CORD AP 30 DR 4 SJT3 14 1310M 1 M019 3601 001198 FUSE CARTRIDGE 250V 20A SLOW BLOW CERAMI 1 M020 DE92 90552C ASSY MOTOR FAN JVM 1650 1660 1 M024 DE31 10178E MOTOR VENTILATION SMV 260UA N 120V...

Page 26: ... GE 1 P037 DE47 00006A HOLDER LAMP 250V 75W 250X187 2POLE OTR 1 P039 DE72 50098A DUCT UPPER PP G430 1 P058 DE61 50540A BRACKET AIR GUIDE A SECC T0 6 W233 L11 1 P059 DE71 60384A COVER FRONT SECC T0 8 W90 L220 OTR6 1 P093 DE61 00027A BRACKET GRILLE JVM1630 SECC T0 5 W60 L17 1 GRILLE P123 DE47 20034A THERMOSTAT 40 70 M5 1 VENT BASE P180 DE61 00591A BRACKET SUPPORT HOOK L SMH7155WC SECC T 1 P181 DE61 ...

Page 27: ...1 00151A SPRING KEY JVM 1860 HSWR PI0 95 OD8 5 2 D011 DE64 00157A DOOR KEY JVM 1860 POM KEPITAL F20 02 2 D017 DE60 60008A PIN HINGE PI4 L17 MSWR10 M301TBC 2 D020 DE97 00250B ASSY HANDLE SSOTR GOOD DESIGN WHT 1 D024 DE64 00444B SCREEN DOOR B SMH7150BC TEMP GLASS T3 2 1 D049 DE94 00595H ASSY DOOR SMH7150WC WHT 1 D054 DE94 00603A ASSY DOOR E SUB SSOTR7 BLK COATING FILM 1 7 3 Door Parts List D006 D005...

Page 28: ...4 DE34 00183B SWITCH MEMBRANE SMH7159WC XAA SEA 150 9 1 C005 DE64 00331B CONTROL PANEL SSOTR GOOD DESIGN PC LEXAN 1 C009 DE64 00416A WINDOW DISPLAY SSOTR GOOD DESIGN SAN T2 1 C073 DE97 00255A ASSY BRACKET C PANEL MO1650WA MO1450WA 1 C082 DE94 00807M ASSY CONTROL BOX 120V60Hz SMH7159WC XAA 1 7 4 Control Parts List C004 C009 C001 C005 C073 C003 ASSY CONTROL BOX C082 ...

Page 29: ...10069A SCREW TAP TH FRFZY TH M4 L10 1 FRONT DE60 10069A SCREW TAP TH FRFZY TH M4 L10 1 GU AIR DE60 10069A SCREW TAP TH FRFZY TH M4 L10 2 MOUNT DE60 10069A SCREW TAP TH FRFZY TH M4 L10 5 PN OUT DE60 10069A SCREW TAP TH FRFZY TH M4 L10 1 VENT M DE60 10080A SCREW WASHER M5 L12 2S 4 HVT DE60 10082H SCREW A 2S 4X12 TOOTHED 2 BASE P DE60 10082H SCREW A 2S 4X12 TOOTHED 1 PN OUT DE60 10122A SCREW TAP TH F...

Page 30: ...1 5V 5V DGND XTL1 DGND 2K 47K R29 8MHz D01 GS1G R03 D17 MM4148 10K OUT DGND 5V DGND TR10 KRC246 KIA7805AF IC2 GND IN C05 C06 470uF 6 7 8 DGND 5V 47uF 24LC04B IC5 1 2 3 45 1K R45 R26 47K C03 KRC246 TR9 150 R08 100nF 1K R15 DGND MM4148 D07 2K R10 DGND GND IN OUT 22uF C08 ELM7533CBA S IC3 PTC1 270M 20K 47K R32 MM4148 D11 24V R05 R14 13K DGND DGND TR11 F1 DGND R24 10K KRA226 MM4148 D22 DGND DGND 47K R...

Page 31: ... 20 265V 1 5A 360mA BK 1 PTC1 1405 000001 VARISTOR 470V 1250A 14x7 5mm TP 1 ZNR1 2001 000495 R CARBON 20KOHM 5 1 4W AA TP 2 4X6 4MM 1 R34 2001 001077 R CARBON S 150OHM 5 1 2W AA TP 2 4X6 4MM 3 R01 02 03 2007 000033 R CHIP 0OHM 5 1 8W DA TP 3216 2 J16 17 18 2007 000282 R CHIP 100KOHM 5 1 10W DA TP 2012 1 R32 2007 000300 R CHIP 10KOHM 5 1 10W DA TP 2012 4 R12 14 17 2007 000468 R CHIP 1KOHM 5 1 10W D...

Page 32: ... 30 9 Schematic Diagrams 9 1 Schematic DiagramS This Document can not be used without Samsung s authorization ...

Page 33: ...e Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law Samsung Electronics Co Ltd July 2003 Printed in Korea Code No DE68 03132A ...

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