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MICROWAVE OVEN

1. Fi F2 t 5 to to 5 YID yt LY Y sv IS Sv o ov ev m Sv o Sv 5 4 d 123233 e T 14 17 4 f e 9 e 6 O 1 1 ij 0 e fa A id 15 lt 12 gt ae m5 2G u i 65 U EM e 5G 9 2965 30 76 F lt 24 X z gt oO 0 oO oO oO oO oO oO OVS SV OVS a B S 52 S 2 5 2 512 512 59 FCZ254 14SL OPTION 2 LSA 3 SK OPTION an 2 g 1 3 9K PAUSE HOLD CLOCK sounD CUSTOM CUSTOM HELP OPTIO AUTO BROWNER N m CANCEL 4 TIMER 2 AU VOLUME COOK COOKE p SCREEN Bs y AUTO AUTO BABY FROZEN DEFROST REHEAT poog CHICKEN FISH RICE BREAKFAST Rao 2 A A A p 4 2 A A 3 9K FROZEN FRESH DIET POTATO POP CORN ONE MIN START DINNER EGETABLES COOK 2 gt 0 gt 2 R33 4 47K J 8 1 Samsung Electronics P C B Diagrams 8 2 P C B Parts List DE61 90164A HOLDER DIGITRON NYLON 66 11 8 BLK MW4370 Parts No Description Specification Q ty Remarks 0401 001002 DIODE SWITCHIN
2. 313 Bs 2 9000 09990 SAMSUNG 260mm amS 402mm T 556mm 2 444mm Samsung Electronics 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 Cover Air of which are contained in one assembly Thermo S W Bracket T C 0 1 Disconnect all lead wires from the magnetron and lamp Remove the air cover Remove screws securing the magnetron to the wave guide Take out the magnetron very carefully Remove tow screws from the back panel of fan motor assembly Take out the fan motor assembly 7 Remove the oven lamp by pulling out from hole of air cover NOTEI When removing the magnetron make sure that its antenna does not hit any HVT adjacent parts or it may be damaged Magnetron 7875 NOTE2 When replacing the magnetron be sure H V Capacitor to remount the magnetron gasket in the correct position and make sure the gasket is in good condition w N 4 2 Replacement of High Voltage Transformer 1 Discharge the high voltage capacitor 2 Disconnect all the leads 3 Remove the mounting bolts 4 Reconnect the leads correctly and firmly Bolts H V Trans Samsung Electronics 4 1 Disassembly
3. 5 7 Adjustment of Primary Switch Door Sensing Switch and Monitor Switch Precaution For continued protection against radiation hazard replace parts in accordance with the wiring diagram and be sure to use the correct part number for the following switches Primary interlock and door sensing switches and the interlock monitor switch replace all together Then follow the adjustment procedures below After repair and adjustment be sure to check the continuity of all interlock switches and the interlock monitor switch When mounting Primary switch and Interlock Monitor switch to Latch Body consult the figure N No specific adjustment during installation of Primary switch and Monitor switch to the latch body is necessary Primary Interlock Switch When mounting the Latch Body to the oven assembly adjust the Latch Body by moving it so that the oven door will not have any play in it Check for play in the door by pulling the door Interlock Monitor assembly Make sure that the latch keys move Switch smoothly after adjustment is completed Completely tighten the screws holding the Latch Body to the oven assembly Lever Door Body Latch Door Sensing Switch 4 Reconnect to Monitor switch and check the continuity of the monitor circuit and all latch switches again by following the components test Door Open Door Closed procedures
4. or A 19 Use replacement components that have the same ratings especially for flame resistance and dielectric strength specifications A replacement part that does not have the same safety characteristics as the original might create shock fire or other hazards 1 3 Special High Voltage Precautions 1 High Voltage Warning Do not attempt to measure any of the high voltages this includes the filament voltage of the magnetron High voltage is present during any cook cycle Before touching any components or wiring always unplug the oven and discharge the high voltage capacitor See Figure 1 1 2 The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to the oven chassis Usea 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 Fig 1 1 Discharging the High Voltage Capacitor 12 Samsung Electronics 2 Specifications 2 1 Table of Specifications ITEM MODEL MB6774W MB6775G TIMER 99 MINUTES 89 SECONDS POWER SOURCE 220V 60HZ AC POWER CONSUMPTION MICROWAVE 1 500W HEATER 1 080W OUTPUT POWER FROM 100W TO 1000W 10 LEVEL POWER IEC 705 TEST PROCEDURE HEATER 1000W OPERATING FREQUENCY 2 450MHz MAGNETRON OM75PH 31 ESS COOLING METHOD COOLING FAN MOTOR OU
5. 13 DE03 30035A MAGNETRON OM75PH 31 ESS M14 DE63 90065N CUSHION GUIDE PUT FOAM T10 W10 L200 BLK MW5 M15 4713 001031 LAMP INCANDESCENT 230V 173mA 40W ORG 25 M 16 DE71 60016A COVER AIR PP 2 WHT M945 MB45 M17 DE93 20001A ASSY BODY LATCH 2ND W1 M97G45 M9745 M 18 DE66 90013A LEVER DOOR POM F20 01 NTR MW5630T M19 DE26 10126A TRANS H V SHV 6574DC1 220V 60HZ DY 2310V 3 M 20 DE63 90163A CUSHION HVT NEOPRENE RUBBER 129 5 W50 L5 M 21 DE61 50106A BRACKET HVC SECC T0 8 W31 1125 8 M22 2501 001011 C 0IL 910pF 2100V BK 54x35x75mm 20mm M 23 DE59 40001A DIODE H V HVR 1X 32B 12 M24 DE39 30024A WIRE LEAD C 3EA0 L1900 A M 25 DE61 40017A FOOT PP A353 BLK MW5630T 2 M 26 DE80 10002A BASE PLATE SGCC T 0 8 W 404 L 633 MW6 1 M27 DE31 10154A MOTOR DRIVE M2HJ497R02 ST 16 21V 5 6 M 28 DE47 20033A THERMOSTAT PW 2N 80 70 125V15A 250V7 5A M 29 DE71 60164F COVER MGT PP TB53 A353 30G MW5430 6430 M 30 DE63 90065V CUSHION LAMP PUT FOAM T35 W20 L160 1 2CU M 31 DE39 30097B ASSY WIRE LEAD G L100 045 GRILL M 32 DE47 20033A THERMOSTAT PW 2N 80 70 125V15A 250V7 5A M 33 DE47 70030B HEATER CERAMIC D12 112 5V4 5A 500W 240HM MB 2 M34 DE61 50178D BRACKET HEATER ALSTAR 0 6 W46 5 L59 2 M 35 ASSY DOOR P BUTTON WHT MW6574W SAM IDEO 1 2 1 MB6774W M 35 ASSY DOOR BUTTON D GRAY MW6575G SAM IDEO 1 MB6775G M 36 ASSY CONTROL BOX AC220V60HZ MB6774W SAM SP MB6774W M 36 ASSY CONTROL BOX AC220V60HZ MB6775G SAM SP MB6775G M 37 DE74 20002A TRAY COOKING GLASS
6. Primary switch 0 Confirm that the gap between the switch Monitor switch COM NC 0 housing and the switch actuator is no more than 0 5mm when door is closed Door Sensing S W 0 5 2 Samsung Electronics Alignment and Adjustments 5 8 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR 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 NOTE Check line voltage under load Low voltage will lower the magnetron output Make all temperature and time tests with accurate equipment 1 Fill the one liter glass vessel with water 2 Stir water in glass vessel with thermometer and record glass vessel s temperature T 10 0 2 3 After moving the water into another glass vessel place it in the center of the cooking tray Set the oven to high power and operate for 43 seconds exactly 1 seconds included as a holding time of magnetron oscillation 4 When heating is finished stir the water again with the thermometer and measure the temperature 2 5 Subtract T from T This will give you the water temperature rise AT 6 The output power is obtained by the follow
7. T6 PI360 1 2CUFT NEG M 38 DE92 90189B ASSY GUIDE ROLLER D16 5 STD M 39 DE67 60002A COUPLER PPS 5GR BRN M97G45 M 40 DE74 70038B RACK WIRE MSWR10 0268 H140 MB6774W Option Parts A Electrostatically Sensitive Devices 7 2 A Warning Samsung Electronics Exploded Views and Parts List 1 3 Door Parts List Ref No Parts No Description Specification Q ty Remarks D 1 DE67 20005A SCREEN DOOR ACRYL PC T 1 5 W 212 5 L 4 MB6774W D 1 DE67 20005D SCREEN DOOR ACRYL T1 5 W212 5 L440 MW6575G MB6775G D2 DE64 40006B DOOR KEY POM TC3005 T2 12GR WHT MW557 MB6774W D2 DE64 40006A DOOR KEY POM TC3005 2 0 12GR BLK CE945G MB6775G D3 DE61 70128A SPRING KEY HSW3 0 6 D5 BLUING D4 DE64 40009D DOOR A ABS HRO370U 12 5 IDEO MW6574W SAM MB6774W D4 DE64 40009E DOOR A ABS HR0370U 2 5 IDEO MW6575G SAM MB6775G D5 DE92 50128E ASSY DOOR E COATING WHT MW6574W MB6774W D5 DE92 50128F ASSY DOOR E COATING BLK MW6575G MB6775G D 6 DE64 40010A DOOR C PP TB53 T1 5 WHT MW6574W MB6774W D 6 DE64 40010B DOOR C PP TB53 T1 5 BLK 1 2CU FT M245 MB6775G D7 DE01 00004A FILM DOOR PE T 0 15 W 183 L 325 NTR 1 D 8 DE61 80002A HINGE UPPER SCP1 12 3 26 77 ZPC3 WHT CE945G D9 DE61 80003A HINGE LOWER SCP1 2 3 26 77 ZPC3 WHT CE945G D10 DE02 00125A TAPE DOUBLE FACE ACRYL T0 45 W9 WHT WF103 7 4 Control Parts List Ref No Parts No Description Specification Q ty
8. Window Display Panel Samsung Electronics 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 discharge the high voltage capacitor 5 1 High Voltage Transformer 1 Remove connectors from the transformer terminals A a Filament Terminals and check continuity 2 Normal resistance readings are as follows Primary Terminals MODEL wBe774W MB6775G Secondary 75 38Q 1096 Filament Shows Continuity Primary 1 1850 10 Room temperature 20 C Secondary Terminal 5 2 Low Voltage Transformer 1 The low voltage transformer is located on the Resistance control circuit board Terminals 2 Remove the low voltage transformer from the SLV945E PCB Ass y and check continuity 1 2 Input 12500 3 Normal resistor reading is shown in the table 4 5 Output18V 1230 7 8 Output2 9V 269 5 3 Magnetron 1 Continuity checks can indicate only an open Magnetron Antenna filament or a shorted magnetron To diagnose an b Gasket Plate open filament or shorted magnetron 2 Isolate the magnetron from the circuit by disconnecting its leads 3 A continuity check across the magnetron filament ter
9. built in protective devices are replaced Restore any missing protective shields When reinstalling the chassis and its assemblies be sure to restore all protective devices including nonmetallic control knobs and compartment covers Make sure that there are no cabinet openings through which people particularly children might insert objects and contact dangerous voltages Examples Lamp hole ventilation slots Inform the manufacturer of any oven found to have emmission in excess of 5 mW cm2 Make repairs to bring the unit into compliance at no cost to owner and try to determine cause Instruct owner not to use oven until it has been brought into compliance CENTRAL SERVICE CENTER Service technicians should remove their watches while repairing an MWO Samsung Electronics 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 If the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Primary and secondary switches as well as the Interlock Monitor Switch The correct adjustment of these switches is described elsewhere in this manual Make sure that the fuse has the correct rating for the particular model being repaired Design Alteration Warning Use exact replacement parts only i e o
10. 7 046 10K KA7533 T Icoa t t c44 C03 c07 NTLAD27 f 470 ATOUF M Ng loour M 2202 0 iuF Z mT mT CONO2 i 1 2 Y T T M 6 1 EM a 28 11 i 8 55 88 tk 5 E T Ri 02 H KSR2005 KSA2005 KSR2005 Sex KSR20051 220 9 e Ie _ l I lt q5v o LIVE E RELAY NNUS Us 01 MAIN KSR1005 KSR1005 YEN 8 2 33 De 5 007 526882 oos o zs e z K T E o x CONO 396 04 24 24y KSR1005 5 AP 020 184148 T 4 di T FYB 10K ALA 40K BES se e P 8Y3 572 009 R46 008 1 4148 aW oon SWITCH 4 5 1005 lt r 1 M25003 Ae T 3 9k cio R47 105 440 107 2 unes 400K Cii 10K 1 24 4 nd TTT TTT 4 OOMHZ X TAL 64 28 58 59 60 35 36 33 55 30 31 INTO MODA vss AVSS AVR RSTX BUZ 2 Pot P40 20 22 P24 P74 PO6 P07 AN7 xo x1 MB89 144AP ICO1 P60 P64 P53 P55 P52 P67 P66 P65 P63 P54 P62 P64 P56 P50 P57 P47 P46 P45 P44 P43 P42 Pat FOP P23 Pio Pit P14 P15 P16 P17 Poo P70 P37 P36 P35 P34 P33 P32 P34 10 40 41 42 43 44
11. A A576 WHT MGT WHT POWER RELAY 27 TCO SECONDARY INTERLOCK 1 INPUT 120V 60HZ NOTE CIRCUIT SHOWN WITH DOOR IS OPENED POSITION 2 DOOR OPEN NOTE FOR SERVICE REPLACEMENT USE 16 GA 105 C 3 LAMP ON THERMOPLASTIC COVERED WIRE EXCEPT 4 P C B PATTERN FOR HIGH VOLTAGE LEADS OR AS NOTED ON SPECIAL LEADS 5 NE P C B IN OUT POINT BLK MAGNETRON Q DIODE BLK amp 7 TO CHASSIS BLK L PRIMARY SWITCH TOP i u o ORG WHT t t m Es HIGH VOLTAGE CAPACITOR N R BLU _ Ax 2 RED 1 1 ORG WHT A BLK DOOR SENSING SWITCH MONITOR SWITCH ow BOTTOM CENTER HIGH VOLTAGE RANSFORMER WHT WHT Y YELLOW WHT WHT POWER RELAY Samsung Electronics 9 1
12. G 1N4148M 100V 200mA 500mW 16 D5 20 0402 000559 DIODE RECTIFIER D4G 400V 1A T 1 3 D1 2 4 0501 000283 TR SMALL SIGNAL KSA539 Y PNP 400mW T0 92 1 Q08 0504 001014 TR DIGITAL KSR1005 NPN 300mW 4 7K 10K T0 5 01 6 7 9 10 0504 001015 TR DIGITAL KSR2005 PNP 300mW 4 7K 10K TO 4 02 5 1405 000129 VARISTOR INR14D271K 270V 4500A 17X12MM T 1 ZNR1 2001 000037 R CARBON S 3300hm 5 1 2W AA TP 2 4x6 4 2 R3 4 2001 000273 R CARBON 100Kohm 5 1 8W AA TP 1 8x3 2m 2 R17 21 2001 000290 R CARBON 1 0Kohm 596 1 8W AA TP 1 8x3 2mm 5 R7 10 14 15 19 2001 000429 R CARBON 1 Kohm 596 1 8W AA TP 1 8x3 2mm 4 R5 6 11 12 2001 000515 R CARBON 2200hm 596 1 8W AA TP 1 8x3 2mm 1 R09 2001 000577 R CARBON 2Kohm 5 1 8W AA TP 1 8x3 2mm 1 R13 2001 000613 R CARBON 3 9Kohm 596 1 8W AA TP 1 8x3 2m 8 R1618202627 282930 2001 000780 R CARBON 4700hm 596 1 8W AA TP 1 8x3 2mm 2 R12 2001 000786 R CARBON 47Kohm 596 1 8W AA TP 1 8x3 2mm 20 R31 50 2001 000904 R CARBON 6200hm 5 1 8W AA TP 1 8x3 2mm 1 R08 2011 000582 R NETWORK 47Kohm 5 1 8W A SIP 9P TP 01 2202 000121 C CERAMIC MLC AXIAL UP050B101KBB 100PF 1 C09 2202 000127 C CERAMIC MLC AXIAL TP050F103ZB 10NF 80 C10 2202 000780 C CERAMIC MLC AXIAL UPO50F104Z 100NF 80 4 C5 7 1 2401 000247 C AL 1SA1ANB107MAN 100UF 20 10V GP 6 3X 1 C14 2401 000466 C AL CESSM1V100M0507 10UF 2096 35V GP 5X7 C08 2401 000914 C AL CESSL1C220M051 1AA 22UF 20 16V GP 5 C03 2401 001412 C AL 1SG1VFB477MAN 470UF 2096 35V GP 10X1 C12 2802 000161 RESONATOR CE
13. RAMIC CST4 00MGW TFO1 3 CN 4 X TAL 3501 001014 RELAY POWER OM1F S 124LM 24V 21 8MA 17A RY02 3501 001015 RELAY POWER OZF S 124LM1P 24V 21 8MA 16A RY03 3501 001016 RELAY MINIATURE JV24 KT 24V 12 5MA 5A 1F RY01 3708 000529 CONNECTOR FPC FC PIC FCZ254 14SL BLK 14P CONO5 3711 000240 CONNECTOR HEADER 1WALL 4P 1R 3 96mm STRA CONO 3711 000881 CONNECTOR HEADER SMW250 03 WHT BOX 3P 1R CONO04 A4106 0154 DIODE ZENER TZP5 1B 5 1 5 7V 40MA T 1W 2001 4106 0154 DIODE ZENER TZP5 1B 5 1 5 7V 40MA T 1W 2002 A4106 0154 DIODE ZENER TZP5 1B 5 1 5 7V 40MA T 1W 2003 DE07 10035A V F DISPLAY SVM 078810 SEA VFD1 DE09 30492A IC MCU MB89144AP 167 12K DIP 64PIN IC01 A DE13 20009A IC KA7533 DIP 1 02 DE26 20144A TRANS L V DN 5574W CE 5574W 120V 60HZ AC LVT1 DE30 20016A BUZZER CBE2220BA STICK BUZ1 DE39 60001A WIRE SO COPPER PI0 6 SN T 52MM TAPING_WI 25 J1 25 DE60 60012A PIN EYELET ID2 1 OD2 5 L3 0 SN BSP T0 25 8 Samsung Electronics 9 Schematic Diagrams 9 1 Schematic Diagrams WARNING POWER MUST BE DISCONNECTED BEFORE SERVICING THIS APPLIANCE CAVITY m i jer S W T V TRANSFORMER 250V20A Me BLK gt 120V T LAMP BLK 2 MONITOR SWITCH aC POWER CORD 71 AC 120V 60Hz EZ Z 5 V CAPACITOR E gt Um 9 z WHT WHT WHT ET 5 gi ov F FA Ll WHT MAGNETRON S
14. Remarks C 1 DE66 20006A BUTTON PUSH RESIN ABS HR 0370U P WHT M9 MB6774W C 1 DE66 20006B BUTTON PUSH ABS HR 0370 GRAY MW5575G IDEO MB6775G C2 DE61 70076A SPRING BUTTON HSWR PIO 6 C 3 DE34 10206T SWITCH MEMBRANE PET 220V 60HZ MB6774W SAM MB6774W C 3 DE34 10206U SWITCH MEMBRANE PET 220V 60HZ MB6775GSAM MB6775G C4 DE72 70005A CONTROL PANEL ABS VH0853 164G PURE WHT MB6774W C4 DE72 70005D CONTROL PANEL ABS VH0853 164G GRAY 12 5 MW MB6775G C5 DE67 40002A WINDOW DISPLAY RESIN ACRYLIC 12 3 M945 I C6 DE91 10468A ASSY P C B MAIN AC 120V 60HZ NS V F D MB6774 C 7 DE93 30404A ASSY CONTROL PANEL 120V60HZ MW6574W 1 2 WHT MB6774W C 7 DE93 30404C ASSY CONTROL PANEL 120V60HZ MW6575G 1 2 D G MB6775G 1 5 Body Latch Parts List Ref No Parts No Description Specification Q ty Remarks B1 DE66 40001A LATCH BODY POM F20 02 40GR NTR B2 3405 000178 SWITCH MICRO 250V 15A 200gf SPST NO B3 3405 000175 SWITCH MICRO 250V 15A 200gf SPST NO B4 3405 000178 SWITCH MICRO 250V 15A 200gf SPST NO B5 DE66 90001A LEVER SWITCH P O M F20 02 2 6 NTR 2ND W P Samsung Electronics 7 3 Exploded Views and Parts List 1 5 Standard Parts List Parts No Description Specification 0 Remarks DE60 10189A SCREW MACHINE TH MA L10 FE FZ YEL N 2 HI UPP DE60 10080A SCREW WASHER M5 L12 25 4 HVT DE60 10082A SCREW A MA 112 25 TOOTHED 2 C PANE DE60 10082A SCREW A MA L12 2S TOOTHED 2 C BLOW DE60 10082A SCREW A MA L12 2S TOOTHED 6 BASE DE60 10066A SCRE
15. TSIDE DIMENSIONS 21 W x 12 H x 17 D NET WEIGHT 41 9 168 SHIPPING WEIGHT 47 4 lbs 2 2 Comparison Chart MODEL FEATURE MB6774W MB6775G MORE LESS i UTO REHEAT UTO DEFROST i TIME COOK i POWER LEVEL i INSTANT COOK i MEMORY i I I gt gt CHILD LOCK LOCK AUTO START BROWNER COOK SOUND DEMO MODE HELP SCREEN qn Samsung Electronics 2 1 3 Operating Instructions 3 1 Control Panel Browner Button f Palomitas De Maiz Alimentos Papas dieteticos Vegetales Comida Instant Cook Button Frescos Congelada Ayuda funcion Comidas Receta de para ninos Cliente Auto Defrost Button gen Mone L Auto Reheat Button Potencia Power Level Button Clock Auto Start Button en Auto Inicio One Minute Button BREE Help Screen Button Number Key Button Espera Hold Timer Button Cronometro QOQ eoo b COL Mas Menos More Less Button Sound Button P m Pause Cancel Button em Inicio Start Button 3 2 Features amp External Views Door Ventilation Slot Heater Elements Light Safety Interlock Holes CEEE Control Panel Door Latches Hig G5 2 999 9999 0999 B 0 Open Door Push Button Glass Tray Guide Roller letal Rack
16. W TAP TH TH M4 L8 FEFZY 2 SLOT 1 B HVC DE60 10053A SCREW TAP PH PH M4 110 FEFZY 2 M GEAR DE60 10053A SCREW TAP PH PH M4 L10 FEFZY 1 C TCO DE60 10082A SCREW A MA L12 2S TOOTHED 2 B LATC DE60 10061A SCREW TAP TH TH M4 L8 STS 2 B HEA DE60 10082A SCREW A MA L12 2S TOOTHED 4 B UPP DE60 10080A SCREW WASHER M5 L12 25 4 MGT DE60 10189A SCREW MACHINE TH MA L10 FE FZ YEL N 2 HI LOW DE60 10082A SCREW A MA 112 25 TOOTHED 1 CV AIR DE60 10082A SCREW A MA L12 2S TOOTHED 1 B MGT DE60 10082A SCREW A MA 112 25 TOOTHED 1 P EART DE60 10082A SCREW A MA L12 2S TOOTHED 5 OPANEL DE60 10082A SCREW A MA L12 2S TOOTHED 1 MEM PN DE61 50279A BRACKET TCO STS304 1 CA UPP DE60 10088A SCREW TAP PH PH M3 L8 FEFZY PLAIN 2 CON PA DE69 30021C BAG PP PE FILM 0 03 1 C BOOK DE02 00029A TAPE SCOTCHPAR POLYESTER 3M 893 W50 1 DE60 10082A SCREW A MA L12 2S TOOTHED 1 C D M 7 4 Samsung Electronics 8 P C B Diagrams 8 1 P C B Diagrams 4 1 GAS SENSOR OPTION 2 ZII SOUND LEVEL OPTION MB6774W 2e DOOR IS OPENED poa cadre ro EE KA7BOBA pos fx 5 046 al RO 0 N 1 1 NJ g 0 10 Eu rH MIS 1 cos o fuF 3 001 0
17. am MICROWAVE OVEN MB6774W MB6775G S E R VI C Manual MICROWAVE OVEN CONTENTS 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments OOOO TOOG 6 Troubleshooting SAMSUNG L 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams SAMTRONICS 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 A r2 m 2 9 99 39 All repairs should be done accordance with the procedures described in this manual This product complies with Federal Performance Standard 21 CFR Subchapter J DHHS Microwave emission check should be performed to prior to servicing if the oven is operative If the oven operates with the door open Instruct the user not to operate the oven and contact the manufacturer and the center for devices and radiological health immediatly Notify the Central Service Center if the microwave leakage exceeds 5 mW cm Check all grounds Do not power the MWO from a 2 prong AC cord Be sure that all of the
18. an program but timer does not start 1 Open or loose wiring of secondary interlock switch 2 Off alignment of primary interlock 3 Defective secondary interlock S W Adjust door and interlock switches Microwave output is low Oven takes longer time to cook food 1 Decrease in power source voltage 2 Open or loose wiring of magnetron filament circuit Intermittent oscillation 3 Aging of magnetron Consult electrician Fan motor turns on when plugged in Loose wiring of door sensing switch Check wire of door sensing switch Oven does not operate and return to the plugged in mode Defective Ass y PCB Replace PCB main Loud buzzing noise can be heard Loose fan and fan motor Loose screws on H V Transformer Shorted H V Diode ow N Tighten screws of fan motor Tighten screws of H V Transformer Replace H V Diode Turntable motor does not rotate s Open or loose wiring of turntable motor Defective turntable motor N Check the wire of turntable motor Replace turntable motor Oven stops operation during cooking Open or loose wiring of primary interlock switch Operation of thermal cutout Magnetron N Adjust door and latch switches Sparks k Metallic ware or cooking dishes touching on the oven wall Ceramic ware trimmed with gold or silver powder also causes sparks N Inform the customer Do not use any type of cook
19. and Reassembly 4 3 Replacement of Door Assembly 4 3 1 Removal of Door Assembly Remove screws securing the upper hinge and lower hinge Then remove the door assembly 4 3 2 Removal of Door C Insert flat screwdriver into the gap between Door A and Door C to remove Door C Be careful when handling Door C because it is fragile 4 3 3 Removal 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 1 Insertion depth of the thin metal plate should be 0 5mm or less 4 3 4 Removal of Key Door amp Spring Remove pin hinge from Door E Detach spring from Door E and key door 4 2 Upper Hinge Screw 55 Lower Hinge Ea Screw Door C 5 A Nu io P x Door A Door E 1 Door E Key Door Spring Samsung Electronics Disassembly and Reassembly 4 3 5 Reassembly Test After replacement of the defective component parts of the door reassemble it and follow the instructions 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 2 Adjust so that the door has no play between
20. beaker which is graduated to 600cc and a place the beaker in the center of the oven Start the oven at the highest power level Set survey meter dual ranges to 2 450MHz z mihi Using the survey meter and spacer cone as 4 gt described above measure arnear the opening of magnetron the surface of the air guide and the surface of the wave guide as c shown in the following photo but avoid the oe i high voltage components The neading a E should be less than 5mW cm 5 12 Note on Measurement 1 Do not exceed the limited scale 2 The test probe must be held on the grip of the handle otherwise a false reading may result when the operator s hand is between the handle and the probe 3 When high leakage is suspected do not move the probe horizontally along the oven surface this may cause damage to the probe 4 Follow the recommendation of the manufacturer of the microwave energy survey meter 5 13 Leakage Measuring Procedure 5 13 1 Record keeping and notification after measurement 1 After adjustment and repair of a radiarion preventing device make a repair record for the measured values and keep the data 2 If the radiation leakage is more than 5 mW St after determining that all parts are in good condition functioning properly and the identical parts are replaced as listed in this manual notift that fact to CENTRAL SERVICE CENTER 5 13 2 At least once a year have t
21. he microwave energy survey meter checked for accuracy by its manufacturer 5 4 Samsung Electronics 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 5 DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD SINCE STATIC DISCHARGE MAY DAMAGE IT ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE BUILT UP 6 1 Electrical Malfunction SYMPTOM CAUSE CORRECTIONS Oven is dead 1 Open or loose lead wire harness Check fan motor when thermal cutout is defective Fuse is OK 2 Open thermal cutout Magnetron No display and no operation at all 3 Open low voltage transformer 4 Defective Ass y PCB Check Ass y PCB when LVT is defective No display and no operation at all Fuse is blown 1 Shorted lead wire harness 2 Defective primary latch switch NOTE 1 3 Defective monitor switch NOTE1 4 Shorted HVCapacitor 5 Shorted HVTransformer NOTE2 Check adjustment of primary interlock monitor door sensing switch NOTE 1 All of these switches must be replaced at the same time refer to adjustment instructions Check cont
22. ing formula 4 187 x 1000 x AT 0 88xMcx T2 To 41 87 Heating Time sec 41 87 4 187 Coefficient for Water 1000 Water cc AT Temperature Rise T2 T1 Mc Cylindrical borosilicate glass weight To Room temperature Output Power 7 Normal temperature rise for this model is 9 9 C to 10 5 C at HIGH NOTE 1 Variations or errors in the test procedure will cause a variance in the temperature rise Additional power test should be made if temperature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step 5 by a factor of 91 times the of centigrade temperature 5 9 Microwave Heat Distribution Heat Evenness The microwave heat distribution can be checked indirectly by measuring the water temperature rise at certain positions in the oven 1 Prepare five beakers made of Pyrex having 100 milliliters capacity each 2 Measure exactly 100milliliters off water load with a measuring cylinder and pour into each beaker 3 Measure the temperature of each water load Readings shall be taken to the first place of decimals 4 Put each beaker in place on the cooking tray as illustrated in figure below Start heating 5 After heating for 2 minutes measure the water temperature in each beaker 6 Microwave heat distribution rate can be calculated as follows Minimum Temperature Rise Heat Distribution X 100 Maximum Temperature Rise The result should exceed 80 C
23. inuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When HVTransformer is replaced check diode and magnetron also Oven does not accept key input Program 1 Key input is not in Sequence 2 Open or loose connection of membrane key pad to Ass y PCB 3 Shorted or open membrane panel 4 Defective Ass y PCB Refer to operation procedure Replace PCB main Timer starts countdown but no microwave oscillation No heat while oven lamp and fan motor turn on 1 Off alignment of latch switches 2 Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE Large contact resistance will bring lower magnetron filament voltage and cause magnetron to lower output and or intermittent oscillation 3 Defective high voltage components H V Transformer H V Capacitor H V Diode Magnetron 4 Open or loose wiring of power relay 5 Defective primary latch switch 6 Defective power relay or Ass y PCB Adjust door and latch switches Check high voltage component according to component test procedure and replace if it is defective Replace PCB main Samsung Electronics Troubleshooting 6 1 Electrical Malfunction continued SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1 Misadjustment or loose wiring of primary latch switch 2 Defective primary latch switch Adjust door and latch switches Oven c
24. minals should indicate one ohm or less 4 A continuity check between each filament terminal and magnetron case should read open Cooling Fins Samsung Electronics 5 1 Alignment and Adjustments 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 9MQ 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 9MQ 5 Resistance between each terminal and chassis should read infinite 5 5 High Voltage Diode 1 Isolate the diode from the circuit by disconnecting its leads 2 With the ohm meter set at the highest resistance scale measure across the diode terminals Reverse the meter leads and read the resistance A meter with 6V 9V or higher voltage batteries should be used to check the front to back resistance of the diode otherwise an infinite resistance may be read in both directions The resistance of a normal diode will be infinite in one direction and several hundred KQ in the other direction 5 6 Main Relay and Power Control Relay 1 The relays are located on the PCB Ass y Isolate them from the main circuit by disconnecting the leads 2 Operate the microwave oven with a water load in the oven Set the power level set to high 3 Check continuity between terminals of the relays after the start pad is pressed
25. nics 4 3 Disassembly and Reassembly 4 6 Replacement of Control Circuit Board 4 6 1 Removal of Control Box Assembly 1 Be sure to ground any static electric charge in your body and never touch the control circuit N Disconnect the connectors from the control circuit board 3 Remove screws securing the control box assembly 4 Remove the screw securing the ground tail of the keyboard 4 6 2 Removal of P C B Assembly 1 Pull the lever end of the plastic fastener and remove the Flexible Printed Circuit FPC of membrane panel 2 Remove screws securing the control circuit board 3 Lift up the control circuit board from the Ass y control box 4 When reconnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 4 6 3 Removal of Window Display amp 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 doublefaced adhesive tape Therefore applying hot air such as using of hair dryer is recommended for smoother removal 3 When installing new membrane key board make sure that the surface of escutcheon base is cleaned sufficiently so that any problems shorted contacts or uneven surface can be avoided 4 4 FPC Connector Screw
26. nly those that are specified in the drawings and parts lists of this manual This is especially important for the Interlock switches described above Never alter or add to the mechanical or electrical design of the MWO Any design changes or additions will void the manufacturer s warranty 10 Always unplug the unit s AC power cord from the AC power source before attempting to remove or reinstall any component or assembly Never defeat any of the B voltage interlocks Do not apply AC power to the unit or any of its assemblies unless all solid state heat sinks are correctly installed Some semiconductor solid state devices are easily damaged by static electricity Such components are called Electrostatically Sensitive Devices ESDs Examples include integrated circuits and field effect transistors Immediately before handling any semiconductor components or assemblies drain the electrostatic charge from your body by touching a known earth ground Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead last Pretaution 1 2 Special Servicing Precautions Continued 17 When checking the continuity of the switches 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
27. ooking Tray Samsung Electronics 5 3 Alignment and Adjustments 5 10 Procedure for Measurement of Microwave Energy Leakage 1 Pour 275 15cc of 20 5 68 9 waterina 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 HER leakage by using a microwave energy survey J meter 3 Set survey meter with dual ranges to 2 450MHz Do 4 When measuring the leakage always use the 2 QOO inch spacer cone with the probe Hold the probe 222 perpendicular to the cabinet door Place the Lis spacer cone of the probe on the door and or a cabinet door seam and move along the seam the unicus door viewing window and the exhaust openings moving the probe in a clockwise direction at a rate of 1 inch sec If the leakage testing of the cabinet door seam is taken near a corner of the door keep the probe perpendicular to the areas making sure that the probe end at the base of the cone does not get closer than 2 inches to any metal If it gets closer than 2 inches erroneous readings may result 5 Measured leakage must be less than 4mW 2 after repair or adjustment Maximum allowable leakage is bmW cm 4mW cm is used to allow for measurement and meter accuracy 5 11 Check for Microwave Leakage 1 Remove the outer panel 2 Pour 275 15 of 2045 C 68 9 F water a
28. the inner door surface and oven front surface If the door assembly is not mounted properly microwave energy may leak from the space between the door and oven 3 Do the microwave leakage test 4 4 Replacement of Fuse 1 Disconnect the oven from the power source 2 Remove the 20A fuse in the fuse holder 3 When replacing the 20A fuse be sure to use an exact replacement part If new 20A fuse blows out again after replacement check the primary interlock switch door sensing switch and interlock monitor switch 4 When the above three switches operate properly check if any other part such as the control circuit board fan motor or high voltage transformer is defective 4 5 Replacement of Drive Motor 1 Take out the glass tray and the guide roller from the cavity Drive Motor N Turn the oven upside down to replace the drive motor C2 Remove a screw securing the drive motor cover or disconnect the drive motor cover from base plate by nipper 4 Disconnect all the lead wires from the drive motor Remove screws securing the drive motor to the cavity Thermo Switch 6 Remove the drive motor and the coupler 7 When replacing the drive motor be sure to remount it in the correct position with the coupler Drive Motor Cover Base Plate 8 Connect all the leads to the drive motor 9 Screw the drive motor cover to the base plate with a screw driver Samsung Electro
29. ware with metallic trimming Uneven cooking Uneven intensity of microwave due to its characteristics Wrap thinner parts of the food with aluminum foil Use plastic wrap or cover with a lid Stir once or twice while cooking foods such as soup cocoa or milk Noise from the turntable motor when it starts to operate Noise may result from the motor Replace turntable motor 6 2 Samsung Electronics 7 Exploded Views and Parts List 7 1 Exploded Views i E M21 M22 SS Samsung Electronics 7 1 Exploded Views and Parts List 7 2 Main Parts List Ref No Parts No Description Specification Q ty Remarks 1 DE70 30002A PANEL OUTER SECC T 0 6 W 424 7 L 1155 MB6774W 1 DE70 30002B PANEL OUTER V STEEL 1 0 5 0 2 W424 7 L1155 MB6775G M2 DE63 90035l CUSHION RUBBER DFA20 T1 5 W190 L100 BLK JE1 M 3 DE61 50403A BRACKET UPPER ALSTAR T0 6 W293 3 L383 M 4 DE63 90065V CUSHION LAMP PUT FOAM T35 W20 L160 1 2CU M5 3601 001034 FUSE FERRULE 250V 20A TIME DELAY CERAMIC 6 A M 6 3602 001002 FUSE HOLDER 125V 250V 15A 7 5A 50mohm M 7 DE31 10157D MOTOR FAN SMF 6574DA 220V 60HZ 2550 A M8 DE39 20055D ASSY POWER CORD DR 19 250V16A L1440 MW4572W M 9 DE39 40619A ASSY WIRE HARNESS A 220V60HZ MB6774W MAB M10 DE47 20009A THERMOSTAT CS 7SA 160 60 187Y 250V7 5A 1 M11 DE61 50490A BRACKET TCO SECC1 10 6 34 58 M12 DE91 70101C ASSY THERMOSTAT MW5574W 160 60 187 HORIZ

MICROWAVE OVEN

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