MICROWAVE OVEN
Contents
1. 1 Pull the lever end of the plastic fastener and remove the Flexible Printed Circuit FPC of membrane panel N Remove screws securing the control circuit board Screw C2 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 Window The membrane key board is attached to the Display escutcheon base with doublefaced adhesive tape Therefore applying hot air such as using of hair dryer is recommended for smoother removal N C2 When installing new membrane key board make sure that the surface of escutcheon base is pa cleaned sufficiently so that any problems M embrane E shorted contacts or uneven surface can be Panel avoided 4 4 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 R2. 21 A1000 0473 R CARBON RD 1 8 T 102 J 1 R05 6 11 12 A1000 0598 R CARBON RD 1 8 T 473 J 20 R31 50 A1000 0620 R CARBON RD 1 2 T S 331 J 2 803 4 1104 0763 C ELEC CE 04 40 85 16V T 220 M NP W 21 1 C03 A4060 0008 TR W RESISTOR KSR1005 300M W 100M A 50V 1 Q1 6 7 9 10 A4060 0009 TR W RESISTOR KSR2005 300M W 100M A 50V 1 02 5 A4106 0154 DIODE ZEN ER TZP5 1B 5 1 5 7V 40M A T 1W 3 ZD1 3 A6010 0461 CONN ECTOR W AFER YW 396 04V W HT 1 CON01 DE07 10035A V F DISPLAY SVM 075510 SEA 1 VFD1 DE09 30459A IC M CU M B89143AP 159 8K DIP 64PIN 1 01 DE13 20009A IC KA7533 DIP 1 02 DE26 20144A TRAN S L V DN 5574W CE 5574W 120V 60HZ AC 1 DE30 20016A BUZZER CBE2220BA STICK 1 BUZI DE39 60001A WIRE SO COPPER PIO 6 SN T 52M M 25 01 25 DE41 10330A P C B M AIN FR 1 T1 6 W 88 L163 USA 2ND 1 DE61 90053A HOLDER DIGITRON PP J 1350 7G BLK 1 8 2 Samsung Electronics 9 Schematic Diagrams 9 1 Schematic Diagrams CAVITY 47 DIODE H V CAPACITOR F FA MAGNETRON Ad ASSY ______ TCO 0
3. DE91 10368A ASSY P C B M AIN 120V 60HZ NS V F D N HEL 1 A C DE93 30384B ASSY CONTROL PANEL N DESIGN D GRY M W 4371G 1 7 5 Body Latch Parts List Ref No Parts No Description Specification Q ty Remarks B1 DE66 40001A LATCH BODY POM F20 02 40GR NTR 1 B2 3405 000178 SW ITCH M ICRO 250V 15A 2009f SPST NO 3 B3 3405 000175 SW ITCH M ICRO 250V 15A 200gf SPST NO 1 4 DE66 90001A LEVER SW ITCH P O M F20 02 2 6 NTR 2ND W 1 7 6 Installation Parts List Ref No Parts No Description Specification Q ty Remarks 1 DE64 90157A TRIMMER UPPER SECC 0 8 W 150 190 TR43 1 2 DE64 90158A TRIMMER LOWER SECC T0 8 W 150 180 BLK M TR 1 3 DE72 50094A DUCT AIR SGCC1 Z 0 6 R4381G 2NG 1 Samsung Electronics 7 3 Exploded Views and Parts List 7 7 Standard Parts List Parts No Description Specification Q ty Remarks DE60 10066A SCREW TAP TH TH M 4 L8 FEFZY 2 SLOT 1 M EM PN DE60 10069A SCREW TAP TH TH M 4 L10 FRFZY 4 B PLTE DE60 10069A SCREW TAP TH TH M 4 L10 FRFZY 1 CV AIR DE60 10080A SCREW W ASHER M 5 L12 25 4 HVT DE60 10080A SCREW W ASHER M 5 L12 25 4 MGT DE60 10053A SCREW PH PH M4 L10 FEFZY 1 CV TCO DE02 00029A TAPE SCOTCHPAR POLY ESTER 3M 893 W 50 1 DE60 10082H SCREW A 2S 4X12 TOOTHED 2 BD LAT DE60 10082H SCREW A 2S 4X12 TOOTHED 2 CON BX DE60 10082H SCREW A 2S 4X12 TOOTHED 4 OUT PN DE60 10045A SCREW PH PH L6 FEFZY 2 MGT TC DE60 10053A SCREW TAP PH PH M4 L10 FEFZY 1 FUSE H DE60 10053A SCREW TAP PH
4. PH M4 L10 FEFZY 2 M GEAR DE60 10066A SCREW TAP TH TH M 4 L8 FEFZY 2 SLOT 1 B HVC DE60 10082H SCREW A 2S 4X12 TOOTHED 1 DE60 10082H SCREW A 2S 4X12 TOOTHED 2 CV BLW DE60 10082H SCREW A 2S 4X12 TOOTHED 1 B DR M DE60 10088A SCREW PH PH M 3 L8 FEFZY PLAIN 2 P C B DE60 10082A SCREW A M 4 L12 25 TOOTHED 4 OUT PN DE60 10082A SCREW A M 4 L12 25 TOOTHED 1 B DR M DE60 10082A SCREW A M 4 L12 25 TOOTHED 2 CON PA DE60 10012A SCREW TAP TITE TH 3 M4 L10 SW R10 ZPC2 2 HI UPP DE60 10082A SCREW A M 4 L12 25 TOOTHED 1 DE60 10012A SCREW TAP TITE TH 3 M4 L10 SWR10 ZPC2 2 HI LOW 7 4 Samsung Electronics 8 P C B Diagrams 8 1 P C B Diagrams POWER OMIF S 124LM CE 5574W LvT4 KA7805A C04 10000 004 0 gt 1 1 046 1 u 002 046 Coa ONO 1 24y m ike KA7533 coi 470uF M MCA 470uF M 22uF M 1 02 Buzi CBE2220BA 05 KSR2005 04 s KSR2005 2K LE BROWNER 57424LM1P RYO3 005 OZF YW396 04y KSR1005 010 dire KSR1005 020 1N4148M 5 1005 007 KSR1005 4N4 148M 24 A Kt gt 10K R14 10K Wr 009 591005 29
5. PRIM ARY S W i TRANS ATO A Bk BLK NL 4 BLK 04 g BLK E EE 5 YEL 1 is 6 120V 8 POW ER CORD gon EA ES 8 Di AC 120V 60Hz 2 X DM i GND gt g a 9 yd 6 WH MONITOR GND T i SWITCH e d vei WHT n N 1 S WHT k WHT m o Te res Id Ghd POWER RELAY SECONDARY INTERLOCK WHT WHITE 1 INPUT 120V 60HZ BLACK on A EE cud NO BIK BLK ag NO m NOI BUK r 4 P C B PATTERN ae pom 5 P C B IN OUT POINT G GREEN BLK BLK BLU ORG CON1 ne PRIMARY INTERLOCK DOOR INTERLOCK SENSING MONITOR SWITCH SWITCH SWITCH MAGNETRON HIGH VOLTAGE DIODE gt 1 CHASSIS MC HIGH VOLTAGE CAPACITOR RED ORG WHT MA BLK BLK SYMBOL COLOR HIGH VOLTAGE ORANGE TRANSFORM ER Samsung Electronics BLACK BLUE e 9 1
6. THE CONTROL CIRCUIT BOARD SINCE STATIC DISCHARGE M AY DAM AGE 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 2 Open thermal cutout M agnetron 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 rep refer to adjustment instructions Check continuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When HVTransformer is replaced aced at the same time 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
7. Voltage Precautions High Voltage Warning Do not attempt to measureany 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 The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to the oven chassis Use a screwdriver 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 Samsung Electronics 2 Specifications 2 1 Table of Specifications ITEM M ODEL M R4381G TIM ER 99 M INUTES 99 SECON DS POW ER SOURCE 120V 60HZ AC POW ER CONSUM PTION MICROWAVE 1 150W OUTPUT POWER FROM 70 TO 700W 10 LEVEL POW ER IEC 705 TEST PROCEDURE OPERATING FREQUENCY 2 450M Hz MAGNETRON OM 75SH 31 COOLING M ETHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 19 W x 115 H x 139 0 NET WEIGHT 30 LBS SHIPPING W EIGHT 33 LBS 2 2 Comparison Chart MODEL FEATURE M R4381G M ORE LESS AUTO REHEAT AUTO DEFROST TIM E COOK POW ER LEVEL INSTANT COOK M EM ORY 005 CHILD LOCK CLOCK GRILL COM Samsung Elec
8. 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 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 motor does not rotate 1 Open or loose wiring of turntable motor 2 Defective turntable motor Check the wire of turntable motor Replace turntable motor Oven stops operation during cooking 1 Open or loose wiring of primary interlock switch 2 Operation of thermal cutout M agnetron Adjust door and latch switches Sparks 1 M etallic ware or cooking dishes touching on the oven wall 2 Ceramic ware trimmed with gold or Silver powder also causes sparks Inform the customer Do not use any type of cookware with metallic trimming Uneven cooking Uneven intensity of microwave due to its characteristics W rap 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 Samsung Electronics 7 Exploded Views and Parts List 7 1 Exploded Views 7 1 Samsung Electronics Exploded Views and Parts List 7 2 Mai
9. 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 13Leakage M easuring 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 cm 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 Samsung Electronics America inc Headquarter office 105 challenger road ridgefield park n j 07660 0511 5 132 At least once a year have the 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 M AY RESULT IN A FALSE READING OR DAM AGE TO YOUR M ETER 5 DO NOT TOUCH ANY PART OF THE CIRCUIT OR
10. 24 ASSY DOOR PUSH D GRAY M W 4371G 1 e A M 25 DE61 80004A HINGE LOW ER SCP1 T2 3 ZN COATING BLK 1 M 26 DE61 80005A HINGE UPPER SCP1 72 3 BLK ZN COATING 1 M 27 DE47 20008A THERM OSTAT PW 2N 52J C 100 60 250V 7 5A H 1 M 28 DE63 90035G CUSHION RUBBER DFA20 2 W190 L100 BLK 1 29 DE72 50094A DUCT AIR SGCC1 Z T0 6 R4381G 2ND 1 Option Parts 7 2 A Warning A Electrostatically Sensitive Devices Samsung Electronics Exploded Views and Parts List 7 3 Door Parts List Ref No Parts Description Specification Q ty Remarks D1 DE64 40014B DOOR A ABS HR0370 T3 M W 4371G 1 D2 DE64 40006A DOOR KEY POM TC3005 2 0 12GR CE945G 1 D 3 DE61 70033A SPRING KEY ES HSWR10 P10 6 06 0 122 3 BL 1 D4 DE67 20151E SCREEN DOOR PET 1 1888 W 166 L305 NO BEDA 1 e D5 DE92 50126B ASSY DOOR E COATING BLK CE745G 1 D6 DE64 40008B DOOR C PP T1 5 BLK CE745G 1 D7 DE01 00003A FILM DOOR PE FILM 70 15 W143 L265 745 1 7 4 Control Parts List Ref No Parts No Description Specification Q ty Remarks C1 DE66 20010B BUTTON PUSH ABS D GRY M 43716 1 e C2 DE61 70076A SPRING BUTTON HSW R PIO 6 1 C3 DE34 10202T SWITCH M EM BRANE PET M R4381G XAA SEA 1 C4 DE72 70009B CONTROL PANEL ABS VH 0853 173 5G GRY M W 437 1 C5 DE67 40003A WIN DOW DISPLAY ACRYL 72 3 W 36 8 191 8 SM 1 C 6
11. 8 Je Tas 3 5 1 B C10 R17 pez CONOS 100K DOOR IS OP SERO 1 1 DOOR SWITCH CONO4 15 4250 03 1 Ts B 40 102 Ad 10 SOUND GAS SENSOR OPTION OPTION LEVEL ENED MBB9144AP ICO1 ARO1 BE47K lo is Io im ko lw lo ko Im im In 5 075510 VFD1 CONO5 FCZ254 14SL OPTION 4 1 OPTION PAUSE HOLD CANCEL 9 TIMER 4 AUTO START SOUND VOLUI t 2 CUSTOM HELPE cook2 2 5 EEN 2 BROWNER Ait OPTION A AUTO DEFROST REHEAT A A CHICKEN VEGETABLES FROZEN FISH RICE BREAKFAST a FROZEN FRESH DINNER gt BEVERAGE OIET VPIEGETABLES COOK POTATO POPCORN ONE MIN 2 L START L R33 AM es R34 A7K J DIAGRAM ECTRIC USA 2ND V F D 8 1 Samsung Electronics P C B Diagrams 8 2 P C B Parts List Parts No Description Specification Q ty Remarks 0401 001002 DIODE SW ITCH
12. ING 1N 4148M 100V 200mA 500mW 16 D05 20 0402 000559 DIODE RECTIFIER D4G 400V 1A T 1 1 01 2 4 0501 000283 TR SM ALL SIGNAL PNP 400mW TO 92 TP 120 1 008 1405 000129 VARISTOR 270V 4500A 17x12mm TP 1 ZNR1 2202 000121 C CERAM IC M LC AXIAL 100pF 10 50V Y5P 1 1 C09 2202 000127 C CERAM IC M LC AXIAL 10nF 80 20 25V Y5V 1 C10 2202 000780 C CERAM IC M LC AXIAL 100nF 80 20 50V Y5 1 C05 2202 000780 C CERAM IC M LC AXIA L 100nF 480 2096 50V Y5 1 C06 2202 000780 C CERAM IC M LC AXIAL 100nF 80 20 50V Y5 1 C07 2202 000780 C CERAM IC M LC AXIAL 100nF 80 20 50V Y5 1 11 2401 000247 C AL 100uF 20 10V GP 6 3x11mm 5mm 1 C14 2401 000466 C AL 10uF 20 35V GP 5x7mm 5mm 1 C08 2401 001412 C AL 470uF 20 35V GP 10x16 5mm TP 1 C01 2401 001412 C AL 470uF 20 35V GP 10x16 5mm TP 1 02 2802 000161 RESONATOR CERAM IC 4M Hz 0 5 TP 10 0x5 0x 1 X TAL 3501 001014 RELAY POW ER 24V 21 8mA 17A 1FormA 20mS 8 1 RY02 3501 001016 RELAY M IN IATURE J V24 KT 24V 12 5M A 5A 1 RYOI 3708 000529 CONNECTOR FPC FC PIC FCZ254 14SL BLK 14P 1 CON05 3711 000881 CONNECTOR HEADER SM W 250 03 W HT BOX 3P 1R 1 CON 04 A1000 0218 R CARBON RD 1 8 T 221 J 1 09 1000 0220 R CARBON RD 1 8 T 621 J 1 R08 A1000 0225 R CARBON RD 1 8 T 392 J 8 R16 18 20 26 30 A1000 0228 R CARBON RD 1 8 T 103 J 5 R07 10 14 15 19 A1000 0241 R CARBON RD 1 8 T 202 J 1 R13 A1000 0327 R CARBON RD 1 8 T 471 J 1 01 1000 0327 R CARBON RD 1 8 T 471 1 R02 A1000 0433 R CARBON RD 1 8 T 104 J 2 R17
13. am MICROWAVE OVEN M R4381G SERVICE CONTENTS 1 Precaution MICROWAVE OVEN 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 SEA 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 operated with the door open for any service test or inspection within b Make the following safety checks on the microwave generating all ovens to be serviced before activating compartments check the magnetron the magnetron or other microwave wave guide or transmission line and source and make repairs as necessary cavity for proper alignment integrity 1 Interlock operation and connections 2 proper door closing d Any defective or misadjusted 3 seal and sealing surfaces arcing components in the interlock monitor wear and other damage door seal and microwave generation 4 damage to or loosening of hinges and transmission systems shall be and latches repaired replaced or adjusted by 5 evidence of dropping or abuse rocedures described in this manual efore the oven is released to the owner e A Microwave leakage check to verify compliance with the Federal pe
14. ays 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 witches 18 19 or transformer always make sure that the power is OFF and one of the lead wires is disconnected Components that are critical for safety are indicated in the circuit diagram by shading or A 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
15. emove connectors from the transformer terminals and check continuity 2 Normal resistance readings are as follows Filament Terminals MODEL SHV 4370UCI Secondary 123 50 10 Filament Shows Continuity Primary 0 557Q 10 Prima Secondary ry Terminal Room temperature 20 C Terminals 5 2 Low Voltage Transformer 1 The low voltage transformer is located on the Terminals Resistance control circuit board CE 5574W 2 Remove the low voltage transformer from the PCB Ass y and check continuity 1 2 Input 24870 3 Normal resistor reading is shown the table 4 5 Outputl7V 9 550 7 8 Output2 7V 1 63Q 5 3 Magnetron 1 checks can indicate only Magnetron Antenna filament or a shorted magnetron To diagnose an 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 terminals 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 cont
16. es Examples Lamp hole ventilation slots Inform the manufacturer of any oven found to have emmission in excess of 5 mW cm 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 SAMSUNG ELECTRONICS AMERICA INC HEADQUARTER OFFICE 105 CHALLENGER ROAD RIDGEFIELD PARK N J 07660 0511 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 only 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 Alw
17. etron 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 T1 10 1 C 8 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 61seconds exactly 2 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 T2 5 Subtract T1 from T2 This will give you the water temperature rise AT 6 The output power is obtained by the following formula 4 187 x 1000 x AT 0 88xMcx T2 To 59 81 Heating Time sec Output Power 59 81 4 187 Coefficient for Water 1000 Water cc AT Temperature Rise T2 T1 Mc Cylindrical borosilicate glass weight To Room temperature 7 Normal temperature rise for this model is 9 C to 11 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 watt
18. inuity of all interlock switches and the interlock monitor switch When mounting Primary switch Interlock F Monitor switch and Secondary switch to Latch Body consult the figure No specific adjustment during installation of Bh o Interlock Switch Primary switch and Monitor switch to the latch body is necessary N C2 When mounting the Latch Body to the oven assembly adjust the Latch Body by moving it so Interlock Monitor that the oven door will not have any play in it Switch Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed Completely tighten the screws holding the Latch Body Latch Lever Door Body to the oven assembly Door Sensing 4 Reconnect to Monitor switch and check the Switch continuity of the monitor circuit and all latch switches again by following the components test Door Open Door Closed procedures Primary switch 0 Confirm that the gap between the switch M onitor switch COM NC 0 housing and the switch actuator is no more than Door Sensing S W 0 0 5mm when door is closed 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 M ICROW AVE ENERGY The output power of the magn
19. inuous 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 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 secondary interlock door sensing and the interlock monitor switch replace all together Then follow the adjustment procedures below After repair and adjustment be sure to check the cont
20. n Parts List Ref No Parts No Description S pecification Q ty Remarks M 1 DE70 30128A PANEL OUTER SECC T0 6 W 351 7 L1014 7 MTR 1 M 2 DE91 40100A ASSY NOISE FILTER SN U15A 250V 15A SECA 1 M 3 DE39 20037E ASSY POWER CORD SJ T AWG16 GRY 230V50HZ L135 1 4 DE31 30031B FAN M OTOR SM F437UA 120V 60HZ ASSY FAN MO 1 M 5 DE39 40699A WIRE HARNESS A 120V60HZ R4381G R V M ODEL 1 M 6 DE47 20009A THERM OSTAT CS 7SA 160 60 187Y 250V7 5A 160 1 e M 7 DE03 30029A M AGNETRON OM 75SH 31 ESS 1 A M 8 4713 001012 LAM P INCANDESCENT 130V 40W ORG B L 2 1 M 9 DE71 60010A COVER AIR PP TB53 T1 7 WHT 646 M 745 1 M 10 DE93 20001D ASSY BODY LATCH 2ND SEA MW 4370W 1 M 11 DE66 90013A LEVER DOOR POM 20 01 NTR M W 56307 1 12 DE26 10113A TRANS H V SHV 4370UC1 120V 60HZ DPC 2080V 1 A M 13 2501 001018 C OIL 800nF 2100V 35X54X70 20mm BK 1 M 14 DE61 50106A BRACKET HVC SECC T0 8 W 31 L125 8 1 M 15 DE59 40001A DIODE H V HVR 1X 32B 12 1 M 16 DE74 20102B TRAY COOKING GLASS T5 0 PI288 780G M 745 1 M 17 DE92 90436A ASSY GUIDE ROLLER M W 4370W 1 18 DE67 60002A COUPLER PPS 5GR BRN 97645 1 M 19 DE61 40017A FOOT PP A353 BLK M W5630T 2 M 20 DE80 10117A BASE PLATE SGCC1 Z T0 8 W 340 L550 M TR43 1 M 21 DE31 10154A M OTOR DRIVE M 2HJ 49ZR02 ST 16 21V 5 6 1 e M 22 DE71 60011A COVER M GT PP T2 0 WHT M 745 1 M 23 ASSY CONTROL BOX 120V60HZ M R4371G GRY 1 A M
21. nd capacitors all of which are contained in one assembly Thermo S W Cover Air 1 Disconnect all lead wires from the magnetron d and lamp LF eg Fan Motor 2 Remove the bracket mounting Nie 3 Remove the air cover 4 Remove screws securing the magnetron to the wave guide 5 Take out the magnetron very carefully 6 Remove screws from the back panel 7 Take out the fan motor 8 Remove the oven lamp by pulling out from hole of air cover carefully When removing the magnetron make V Trans sure that its antenna does not hit any adjacent Magnetron parts or it may be damaged H V Capacitor NOTE2 When replacing the magnetron be sure to remount the magnetron gasket in the correct position and make sure the gasket is in good condition 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 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 to remove Door Be careful when handling Door C because it is fragile 4 3 3 Removal of Door E Following the procedure as sho
22. obe perpendicular to the cabinet door Place the spacer cone of the probe on the door and or cabinet door seam and move along the seam the 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 cm2 after repair or adjustment Maximum allowable leakage is 5mW cm 4mW cm is used to allow for measurement and meter accuracy 5 11 Check for Microw ave Leakage 1 Remove the outer panel 2 Pour 275 15cc of 2045 C 68 9 F water in a beaker which is graduated to 600cc and place the beaker in the center of the oven 3 Start the oven at the highest power level 4 Setsurvey meter dual ranges to 2 450MHz 5 Using the survey meter and spacer cone as described above measure arnear 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 neading should be less than 4mW cm2 5 12 Note on M easurement 1 Do not exceed the limited scale 2 The test probe must be held on
23. 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 M agnetron 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 6 1 Troubleshooting 6 1 Electrical Malfunction c ontinued 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 can 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
24. rformance standard should be performed on each oven prior to release to the owner Samsung Electronics 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 1 pa 99 5 pi 95 N 39 All repairs should be done in 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 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 voltag
25. s is computed by multiplying the temperature rise step 5 by a factor of 70 times the of centigrade temperature 5 10 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 RERO Temperature Rise Heat Distribution X 100 Maximum Temperature Rise The result should exceed 65 Cooking Tray Samsung Electronics 5 3 Alignment and Adjustments 5 10 Procedure for Measurement of Microwave Energy Leakage 1 Pour 275 15 of 20 5 68 9 F water ina 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 3 Set survey meter with dual ranges to 2 450MHz 4 When measuring the leakage always use the 2 inch spacer cone with the probe Hold the pr
26. tronics 2 1 3 Operating Instructions 3 1 Control Panel One Minute Button Auto Defrost Button Clock Auto Start Button 4 TA Hold Timer Button Hold More Less Button Less Pause Cancel Button Auto Auto Defrost Reheat Power Level Button _ Power Level Instant Cook Button Frozen Dinner 5 Auto Reheat Button 3 2 Features amp External Views Number Key Button Start Button Door Latches Control Panel Glass Plate Open Door Push Button 200mm Samsung Electronics SE 344mm 3 1 Operating Instructions 3 3 Installation Instructions CAUTION THIS OVEN WAS MANUFACTURED FOR USE IN A RECREATIONAL VEHICLE ONLY MAY BE BUILT INTO A CABINET STRUCTURE BUT NOT FOR USE ADJACENT TO WITHIN 2 FEET OF ANY GAS OR ELECTRIC RANGE COOKTOP OR OVEN PLUG THE THREE PRONG POWER CORD INTO A PROPERLY GROUNDED OUTLET 120V 60Hz SCREW Trim to outcase WIDTH 193 DEPTH 13 HEIGTH 1 1 0 Trim to outcase gt Fig 2 3 2 Samsung Electronics 4 Disassembly and Reassembly 4 1 Replacement of Magnetron otor Assembly and Lamp Remove the magnetron including the shield case permanent magnet choke coils a
27. ut 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 blower motor or high voltage transformer is defective 4 5 Replacement of Drive Motor a amp ON oO 8 9 Take out the glass tray and guide roller from the cavity Turn the oven upside down to replace the drive motor Remove a screw securing the drive motor cover Disconnect all the lead wires from the drive motor Remove screws securing the drive motor to the cavity Remove the drive motor and coupler 7 When replacing the drive motor be sure to remount it in the correct position with the coupler Connect all the leads to the drive motor Screw the drive motor cover to the base plate with a screw driver Samsung Electronics Drive M otor Thermo Switch Base Plate Drive M otor Cover 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 2 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 Control Box the keyboard 4 6 2 Removal of P C B Assembly
28. wn 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 Upper Hinge Screw Lower Hinge Screw Door C Door A Door E LM M NM M BM BE NM BN eee 7 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 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 15A fuse in the fuse holder 3 When replacing the 15A fuse be sure to use an exact replacement part If new 15A fuse blows o
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