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2. No Code No Description Specification Q ty Remark B001 3405 001034 SWITCH MICRO 125 250VAC 16A 200GF SPST N 1 PRI S W B002 3405 001033 SWITCH MICRO 125 250VAC 16A 200GF SPST N 1 MONITOR B004 3405 001042 SWITCH MICRO DC 24V 0 3A 150gf 1 DOOR S W 006 DE72 00138A BODY LATCH 2000 0 6 0 8 1 2 1 009 DE66 00088A LEVER SWITCH 2000 0 6 0 8 1 2 1 018 DE96 00115A ASSY BODY LATCH MW850WA NC2000 BUTTON 1 001 DE70 30001U PANEL OUTER MR5482W SECC T0 6 W360 L1128 1 MR1031UWC 001 DE70 30001Y PANEL OUTER MR1032BB SECC T0 6 BLK 1 MR1032UBC M015 DE39 20037J ASSY POWER CORD CM1020B SJT AWG16 3 12 1 019 3601 001198 FUSE CARTRIDGE 250V 20A SLOW BLOW CERAMI 1 M018 DE47 40025A HOLDER FUSE KFSN L 16 15A NYLON 66 5G 1 M020 DE96 00305A ASSY MOTOR FAN SMF 5THUA 120V60Hz 2450 5 1 022 DE63 00210A COVER BLOWER 5TH 1 0 PP 1T1 5 1 M023 DE31 10185B MOTOR FAN SMF 3RDUA1 120V60Hz 2300rp 1 M029 DE47 20008A THERMOSTAT PW2N 52JC 100 60 250V 7 5A H 1 M034 DE67 00182A COUPLER 5TH 1 0 PPS 1 M035 OM75P 31 ERHN ASSY MAGNETRON OM75P 31 ERHN 1 M036 4713 001102 LAMP INCANDESCENT 125V 25W TRP 25x 1 M037 DE63 00208A COVER AIR 5TH 1 0 PP 1 M038 DE26 00088A TRANS H V SHV U1040A 120V 60HZ 2220V 3 3 1 039 2501 001016 C OIL 950nF 2 1KV BK 35x54x80 20mm 1 M040 DE61 50106A BRACKET HVC
3. 4 3 3 Removal of Key Door amp Spring Remove pin hinge from Door E Detach spring from Door E and key door Key Door BL b p sm a Aloo S J TES 1 P 4 3 4 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 When 20A fuse blows out by the operation of interlock monitor switch failure replace the primary interlock Switch door sensing switch monitor switch and power relay 3 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 Take out the glass tray guide roller fr
4. 1 P C EA DE60 10082H SCREW A 29 4 12 3 PN OUT DE60 10098A SCREW ASSY TAP TITE GLD SWRCH18A ZPC2 PH TC M4X8 WT 2 M DRIV DE60 10098A SCREW ASSY TAP TITE GLD SWRCH18A ZPC2 PH TC M4X8 WT 1 HVD DE60 10195A SCREW STAR POLE SWCH18A 4 12 TH 2 ZNC 2 O PANEL DE60 10088A SCREW TAP PH FEFZY PLAIN PH M3 L8 2 DE60 10059A SCREW TAP TH SUS410 CR TH M4 L8 2 C CEILING DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 3 B PLTE DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 2 BD LAT DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 2 CN BOX DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 1 CV AIR DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 2 MGT TCO DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 2 MO FAN DE60 10070A SCREW TAP TH FEFZY 2 SLOT TH M4 L12 1 S M EA DE60 10012A SCREW TAP TITE SWR10 M4 L10 TH 3 ZPC2 1 DE60 10080B SCREW WASHER 2S SWRCH18A ZP2 PH PI5 L10 4 MGT DE60 10080B SCREW WASHER 2S SWRCH18A ZP2 PH PI5 L10 4 TNS HV 18 8 P C B Diagrams 8 1 P C B Diagrams This Document can not be used without Samsung s authorization
5. 2 Specifications 2 1 Table of Specifications TIMER 99 MINUTES 99SECONDS POWER SOURCE 120VAC 60Hz POWER CONSUMPTION MICROWAVE 1 500W OUTPUT POWER 1000W 10 LEVEL POWER OPERATING FREQUENCY 2 450MHz MAGNETRON OM75P 31 ESS COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 20 W x 13 H x 14 D NET WEIGHT 40 8 Ibs SHIPPING WEIGHT 36 3 Ibs 3 Operating Instructions 3 1 Control Panel Auto One Defrost Minute Popcorn Potato Beverage Frozen Fresh Pizza Dinner Vegetables Reheat Handy Easy Snack Helper Meals Bar 1 Melt Chocolate 1 Chicken Nuggets 2 soften Cream Cheese 2 Hot Dogs 2 Chicken Wings 3 Melt Butter ch Fries 3 Potato Skins dp Sandwich 4 Cheese Sticks level Less 1 2 3 timer A 5 6 pin 7 8 9 Sound 0 Pause Start Cancel 3 2 Features amp External Views Door Ventilation Holes Light Safety Interlock Holes Control Panel Open Door Push Glass Tray Guide Roller E eI Za L 216mm 4 369 517mm 379mm 4 Disassembly and Reassembly 4 1 Replacement of Magnetron Motor Assembly and Lamp Remove the magnetron including the shield case permanent magnet choke coils and capacitors all of which are contained in one assembly Disconnect all lead wires from the magnetron and lamp Remove a scre
6. um MICROWAVE OVEN MR1031UWC MR1032UBC SERVICE Manual saa 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 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 procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal perfo
7. P6221 Les Leg TEST oeron M HOLD aer INSTANT INSTANT m OPTION 9 OPTION 4 E a TIMER COOK REHEAT 3 OPTION Cito P6120 ap nas 2 3 tal 5 BACON OPTION DUAL OPTION 10 5 6 7 8 9 MoRE IBAVERAGE ES SOFTEN OPTION P65 24 8 ves ICE CREAM al al al al m 8 USA KEY MATRIX 34 15 dadd 004 EASY SENSOR OPTIKON oo od OO Nee 19 PEO t Se Sera 1 1 41BZ CONTROL I MODEL I DATA 1 0 36 I OPTION CH lt I 1004 I l Rm Re7 QU ale a a I 1 2K 100K SENSOR 2002 gu I I iO N RELAY 10uF M 02 5 1B a See TROB 2 BZPLUSE peo 377 272 5v be J Ral frst 1195 I I ws wm e sch RS 11951 REB MEXICO Q a I IGA a 20067 i m 1 777 NL 11523 el SMW250 03BLU ER Uu c r MR EE e IEMATIC 19 8 2 P C B Parts List Code No Description Specification Q ty Remark 2007 000546 R CHIP 20KOHM 5 1 10W DA TP 2012 1 R32 3501 001155 RELAY MINIATURE 24VDC 200MW 3000MA 1FORMA 10MS 10MS 1 01 3501 001188 24V DC 0 53W 1FormA 9 3ms 10m
8. a e 3 ania P73 1 Sa pov H H pe TR13 Tt 1 31 P12 P71 3 2265 a E ele r gt a 5 x S ox 3 3 I Se E VT 2 TOROS SES JS 2 d 15 X IN Pred cS d 15 E E 8 5 I 18 1200 Olen d Blea j 9 S5 ole te Zeaq B e n gt 18 5 I i lea e jw 1 I 92 m z TRO3 Jeg 4 H MHZ Cao x 8 EISE NB gu 9 gt 5 1195 T 1 2 102 z 8 I 19 pn _ L Je sam T ww eil TSS sy e e m i 1NA148M NA 1 48M 1NA148M INA 48M INA148M INA148M NA1 48M 7 D07 x x x x Y a i A yoy I I 045 Vo Vor Yoe Yor _ ce IE Ene Gs lr e S eir cd oil 9 2 3 4 5 6 7 B 3 CNO3 __39 p22 3 gg Ce pm PONER Mum COMBI 6 OPTION 1 E OPTION SMW250 O3WHT 910 Dos kk Ra start 1820915 BESH VUEN opTron Ki 1 1 30 P11 ds BAA VEG DINER I 501 424 02 R10 matzen aen cL et eara 94 oum lem 2 1K OPTION 4 ig J ims 4 DEE WW eegne VER lemer era Bagg MAT Im AAT 8 108 Ee 2 000 IPTZZA EH 40K ae EE an 5
9. 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 assembly Make sure that the latch keys move smoothly after adjustment is completed Body Latch Completely tighten the screws holding the Latch Body to the oven assembly Interlock Monitor Switch 4 Reconnect to Monitor switch and check the ever Switch continuity of the monitor circuit and all latch switches again by following the components test Door Sensing Switch procedures 5 Confirm that the gap between the switch Door Open Door Closed housing and the switch actuator is no more than 0 5mm when door is closed Primary Interlock 0 Monitor switch COM NC 0 6 Interlock Switch Replacement When Door Sensing switch m 0 replacing faulty switches be sure switch mounting tabs are not bent broken or otherwise deficient in their ability to secure the switches in place 10 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 NOT
10. PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER 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 Fuse is OK 2 Open thermal cutout Magnetron cutout is defective No display and no operation at all 3 Open low voltage transformer Check Ass y PCB when LVT is 4 Defective Ass y PCB defective No display and no operation at all 1 Shorted lead wire harness Fuse is blown 2 Defective latch switch NOTE 1 Check adjustment of latch switch 3 Shorted HVCapacitor power relay 4 Shorted HVTransformer NOTE2 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 HVTransformer is replaced check diode and magnetron also Oven does not accept Key input is not in Sequence Refer to operation procedure key input Program Open or loose connection of membrane key pad to Ass y PCB Shorted or open membrane panel Defective Ass y PCB Replace PCB main Off alignment of latch switches Open or loose con
11. SECC T0 8 W31 L125 8 1 M046 DE60 60025A PIN FOOT PP JI350 BLK 4 M047 DE61 40065A FOOT PP T2x22x17mm BLK 4 M048 DE61 00557C BASE PLATE MR1031UWC SGCC T0 6 1 M049 DE31 10154A MOTOR SYNCHRONOUS 2 492 02 5 16 50 60 1 051 DE63 00209A COVER MGT 5TH 1 0 PP T2 0 1 099 DE66 90113A LEVER DOOR PP TB53 GH41 T2 5 12g NT 1 M157 DE31 90057A BLADE FAN PP T1 5 3RD W 1 P020 DE72 50092B DUCT AIR SGCC T0 6 W150 L212 1 T001 DE74 20015G TRAY COOKING 3RD 1 0 T6 1115G HKS 1 T017 DE97 00222A ASSY GUIDE ROLLER NC 1 2CUFT SPS C832 B 1 0009 DE64 00562A TRIM LOWER SECC T1 0 WHT 1 MR1031UWC 0009 DE64 00562A TRIM LOWER SECC T1 0 BLK 1 MR1032UBC U010 DE64 00564A TRIM UPPER SECC T1 0 WHT 1 0 CU FT 1 MR1031UWC U010 DE64 00564B TRIM UPPER SECC T1 0 BLK 1 0 CU FT 1 MR1032UBC 0011 DE70 40311A PLATE BOTTOM MR5481G SGCC T0 6 W253 1 W002 DE39 00256A WIRE HARNESS A MW1250WA 120V60HZ NC2000 1 16 7 3 Control and Door Parts List No Code No Description Specification Q ty Remark C003 RA K2LED1 54 ASSY PCB PARTS MR1031WC UWC 120V60HZ 1 C004 DE34 00190D SWITCH MEMBRANE MR1031UWC XAA ENGLISH 1 MR1031UWC C004 DE34 00190F SWITCH MEMBRANE MR1032UBC XAA ENGLISH 1 MR1032UBC C005 DE72 70202J CONTROL PANEL MW1030WA ABS VE0812 1 MR1031UWC C005 DE72 70202
12. board from the Ass y control box 4 When reconnecting the FPC connector make sure that the holes on the connector are properly SS 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 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 and check continuity 2 Normal resistance readings are as follows SHV U1040A Secondary 99 509 2 Filament Shows Continuity Primary 0 3652 2 Room temperature 20 C Pri 5 2 Lo
13. C CERAMIC CHIP 1nF 10 50V X7R TP 2012 6 C13 C17 C20 2203 001608 C CERAMIC CHIP 22nF 80 2096 50V Y5V TP 2012 4 C09 C12 2401 000151 C AL 1000uF 2096 25V GP TP 10x20 5 1 C02 2401 000244 C AL 100uF 209 6 10V GP TP 6 3x7 5 1 C03 2401 000911 C AL 22uF 20 16V GP TP 5x7 5 2 C04 C06 2401 002075 C AL 4 7uF 20 50V GP TP 5x11 5 1 C05 2401 002598 C AL 220uF 20 50V GP TP 10x16 5 1 C01 2802 000188 RESONATOR CERAMIC 8MHz 0 596 TP 10 0x5 0x8 0mm 1 XTL1 3711 000881 CONNECTOR HEADER BOX 3P 1R 2 5mm STRAIGHT SN 1 CNO3 3711 004143 CONNECTOR HEADER BOX 2P 3P 1R 5mm 2 5mm STRAIGH 1 CNO2 DE39 60001A WIRE SO COPPER PI0 6 SN T 52MM TAPING WIRE 10 J01 J10 20 9 Schematic Diagrams 9 1 Schematic Diagrams This Document can not be used without Samsung s authorization NOTE CIRCUIT SHOWN WITH DOOR IS OPENED POSITION WARNING NOTE FOR SERVICE REPLACEMENT USE 16 GA 105 C THERMOPLASTIC COVERED WIRE EXCEPT POWER MUST BE DISCONNECTED FOR HIGH VOLTAGE LEADS OR AS NOTED ON SPECIAL LEADS BEFORE SERVICING THIS APPLIANCE SECONDARY S W O O a BLK 250V 20 TRANS YE d LK BU e gt P A VY YEL 120V au lt Ko FA Pe e 3LK BS 21V dz gt 9 So YE a POWER 22 C 27 4 CORD 2 Z 3 foe _ 986 MM A 120V60
14. E 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 glass vessel with thermometer and record glass vessel s temperature T1 10 1 C 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 44seconds exactly 3 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 T 6 The output power is obtained by the following formula Output Power 4 187 1000 x AT 0 55xMcx T T 44 Heating Time sec 41 41 Counting Time sec 4 187 Coefficient for Water 1000 Water cc AT Temperature Rise T1 T2 To Room Temperature Mc Cylindrical borosilicate glass weight 7 Normal temperature rise for this model is 9 3 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 11 5 9 Procedure for Measurement of Microwave Energy Leakage 1 Pour 275 15 of 20 5 68 9 F water a beaker which is graduated to 600cc and place the beaker in the center of the o
15. FLOOR OR SUPPORT RUNNERS THAT ARE FLUSH WITH BOTTOM EDGE OF CABINET OPENING Fig 2 4 2 Replacement of High Voltage Transformer 1 Discharge the high voltage capacitor PRECAUTION 2 Disconnect all the leads Servicemen should remove their watches whenever 3 Remove the mounting bolts working close to or replacing the magnetron 4 Reconnect the leads correctly and firmly PRECAUTION There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH VOLTAGE TRANSFORMER secondary and filament terminals It is extremely dangerous to work on or near these circuits with the oven energized DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron 4 3 Replacement of Door Assembly 4 3 1 Removal of Door C Insert flat screw driver into the gap between Door A and Door C to remove Door C Be careful when handling Door C because it is fragile Then remove the door assembly 4 3 2 Removal of Door E 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 tick sound 1 Insertion depth of the thin metal plate should be 0 5mm or less
16. Hz 7 uA 3 ED KO HT 777 gt No N m lt RED E E 9g gt L lt as 7 1 pco pattern H x E e J WHT 7 WHT Oo e c MGT CAVITY TCO PRIMARY INTERLOCK 7777 7777 7777 a E DOOR S W m on POWER RELAY V oxa ASSY P C BOARD VOLTAGE DIODE BLK Em 52 5515 BLK SECONDARY SWITCH TOP ra ILI ig PED D Q ORG x ORG RED d HIGH VOLTAGE CAPACITOR N BLU BLU A RED RED RED WHT DOOR SENSING SWITCH MONITOR SWITCH BLK an BOTTOM CENTER SYMBOL COLOR HIGH VOLTAGE ORG ORANGE TRANSFORMER WHITE WHT RED WHT POWER RELAY 21 This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law ELECTRONICS Samsung Electronics Co Ltd June 2003 Printed in Korea Code No DE68 03208A
17. J CONTROL PANEL MW1030BA ABS VE0812 1 MR1032UBC C006 DE61 70076A SPRING BUTTON HSWR PIO 6 OD19 L23 5T 1 C007 DE66 20275A BUTTON PUSH 3RD W S1 MW5592W 9g 1 MR1031UWC C007 DE66 20275K BUTTON PUSH JE1045GBC ABS BLK SI 1 MR1032UBC C009 DE67 40179A WINDOW DISPLAY SAN T2 0 SMOG 1 C082 ASSY CONTROL BOX 120V60Hz MR1031UWC XAA 1 MR1031UWC S N A C082 ASSY CONTROL BOX 120V60Hz MR1031UBC XAA 1 MR1032UBC 5 0002 DE64 40317M DOOR A MW1030WA ABS GENERAL WHT T2 1 MR1031UWC D002 DE64 40317T DOOR A MW1030BA ABS HRO370 T2 0 BLK NC 1 0 1 MR1032UBC D003 DE67 20197D SCREEN DOOR MW1030WC PET T0 25 W210 4 L3 1 0004 DE94 00910A ASSY DOOR E COATING MW1030WC XAA BLK 5T 1 D005 DE01 00118A FILM DOOR MW5896W L185 T0 15 W304 1 0006 DE64 40012A DOOR C RESIN PP TB53 BLACK CE94 1 D007 DE61 70128A SPRING KEY HSWR PIO 6 D5 0D6 L23 5 21 1 D011 DE64 40006F DOOR KEY POM F20 02 12G BLK MW7897G 1 D015 DE94 00912A ASSY DOOR SUB MW1030WC XAA 5TH 1 0 1 D049 ASSY DOOR MW1030WC XAA PURE WHT 120V 60H 1 MR1031UWC S N A D049 ASSY DOOR MW1030WC XAA BLK 120V 60H 1 MR1032UBC 5 S N A SERVICE NOT AVAILABLE 17 7 4 Standard Parts List Code No Description Specification Q ty Remark DE92 90522A ASSY SCREW PACK MR5481G SCREW A 6EA 1 DE60 10082H SCREW A 29 4 12
18. S 1 02 3708 001551 CONNECTOR FPC FFC PIC 14P 1 25mm STRAIGHT SN 1 CN04 DE07 00021K LED DISPLAY CSQ 4246G 10 NC2000 CMO 40 1 LED1 DE09 00201A IC MICOM TMP87CH47U 3CG1 SM 200102 BN 1 IC01 DE26 00037A TRANS L V SLV 4290U 120V 60Hz AC17V 7V 35 10 PIN 1 LVT1 DE30 20016A BUZZER CBE2220BA STICK 1 BUZ1 0401 001083 DIODE SWITCHING MM4148 100V 150MA LL 34 TP 5 D08 D12 0401 001083 DIODE SWITCHING MM4148 100V 150MA LL 34 TP 9 D15 D23 0402 001103 DIODE RECTIFIER 1T4 400V 1A TS 1 TP 7 D01 D07 0403 001288 DIODE ZENER ZMM55C5V1 4 8 5 4V 500MW LL 34 TP 1 2001 0501 000465 TR SMALL SIGNAL MMBT3904 NPN 350MW SOT 23 TP 30 300 1 TRO1 0504 001008 TR DIGITAL RN2427 PNP 200MW 2 2K 10K SOT 23 TP 5 TRO9 TR13 0504 001080 TR DIGITAL KRC246S NPN 200mW 2 2K 10K SOT 23 TP 3 02 05 08 1202 000141 IC VOLTAGE 7033 SOT 89 3P SINGLE 0V P 1 IC03 1203 001037 IC VOLTAGE REGULATOR 78L05 SOT 89 3P 185MIL PLASTIC 1 IC02 1405 000001 VARISTOR 470V 1250A 14x7 5mm TP 1 ZNR1 2007 000033 R CHIP 0OHM 5 1 8W DA TP 3216 4 J11 J13 J16 2007 000282 R CHIP 100KOHM 5 1 10W DA TP 2012 2 R27 R28 2007 000300 R CHIP 10KOHM 5 1 10W DA TP 2012 3 07 08 09 2007 000346 1200HM 5 6 1 8W DA TP 3216 8 R19 R26 2007 000468 R CHIP 1KOHM 5 1 10W DA TP 2012 6 R01 R03 RO05 R10 R13 2007 000671 R CHIP 2KOHM 5 1 10W DA TP 2012 1 R02 2007 000931 R CHIP 4700HM 5 1 10W DA TP 2012 1 R06 2007 000941 R CHIP 47KOHM 5 1 10W DA TP 2012 5 R14 R18 2203 000444
19. ide and the surface of the wave guide as shown in the following photo but avoid the 19 high voltage components The reading should be less than 4mW cm 2 7 5 11 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 12 Leakage Measuring Procedure 5 12 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 4 mW cm zafter determining that all parts in good condition functioning properly and the identical parts are replaced as listed in this manual notift that fact to CENTRAL SERVICE CENTER 5 12 2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer 12 6 Troubleshooting PRECAUTION CHECK GROUNDING BEFORE CHECKING FOR TROUBLE BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT DISCHARGE THE HIGH VOLTAGE CAPACITOR WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER DISCONNECT ONE LEAD WIRE FROM THESE
20. ing 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 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 Replace turntable motor Oven stops operation during cooking 1 Open or loose wiring of latch switch 2 Operation of thermal cutout Magnetron Adjust door and latch switches Sparks 1 Metallic 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 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 14 7 Exploded Views and Parts List 7 1 Exploded Views 15 7 2 Main Parts List
21. le ventilation slots Inform the manufacturer of any oven found to have emission 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 CENTRAL SERVICE CENTER 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 the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Secondary door sensing switch and power relay 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 13 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 Always unplug the unit s AC power cord from the AC power source before attempting to remove or reinstall any com
22. nection 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 Secondary latch Switch 6 Defective power relay or Ass y PCB N N c Adjust door and latch switches Timer starts countdown but no microwave oscillation No heat while oven lamp and fan motor turn on Check high voltage component according to component test procedure and replace f it is defective Replace PCB main 13 6 1 Electrical Malfunction continued SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1 Misadjustment or loose wiring of latch switch 2 Defective latch switch Adjust door and latch switches Oven can program but timer does not start 1 Open or loose wiring of latch switch 2 Off alignment of latch switch 3 Defective latch switch 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 wir
23. o 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 the other direction Na 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 Secondary 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 and secondary interlock switches Door Sensing Switch 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 Door Sensing switch and Interlock Monitor switch to Latch Body consult the figure 2 No specific adjustment during installation of Primary switch Secondary switch Door Sensing switch p and Monitor switch to the latch body is necessary Primary Interlock 3 When mounting the Latch
24. om cavity 2 Turn the oven upside down to replace the drive motor Remove a screw securing the drive motor cover or disconnect the drive motor cover from base plate by nipper B Disconnect all the lead wires from the drive motor II Remove screws securing the drive motor to the cavity 000 dt e 9 Remove the drive motor and the coupler When replacing the drive motor be sure to IZ 7 En 17 AC remount it in the correct position with the coupler 8 Connect all the leads to the drive motor 9 Screw the drive motor cover to the base plate Drive Motor Cover Base Plate with a screw driver Drive Motor 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 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 Screw 2 Remove screws securing the control circuit board 3 Right up the control circuit
25. ponent or assembly 14 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 15 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 16 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 1 2 Special Servicing Precautions Continued 17 When checking the continuity of the witches or transformer always make sure that the power is OFF and one of the lead wires is disconnected Components that are critical for safety are indicated in the circuit diagram by shading AN or 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 NOTE Connect the oven to a 20A When connecting the oven to a 15A make sure that circuit breaker can operate 1 3 Special High Voltage Precaution
26. rmance standard should be performed on each oven prior to release to the owner 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 2 1 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 N 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 immediately 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 cabinet openings through which people particularly children might insert objects and contact dangerous voltages Examples Lamp ho
27. s 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 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 terminals It is extremely dangerous to work on or near these circuits with the oven energized DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron H V Capacitor Touch chassis ground first then short to the high voltage capacitor terminal by using screwdriver or jumper wire Fig 1 1 Discharging High Voltage Capacitor PRECAUTION Never touch any circuit wiring with your hand nor with uninsulated tool during operation PRECAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron
28. ven 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 probe perpendicular to the cabinet door Place the spacer cone of the probe on the door and or cabinet door e 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 5cm to any metal If it gets closer than 5cm erroneous readings may result 5 Measured leakage must be less than 4mW cm after repair or adjustment Maximum allowable leakage is 5mW cm 4mW cm is used to allow for measurement and meter accuracy 5 10 Check for Microwave Leakage 1 Remove the outer panel 2 Pour 275 15 of 20 5 C 68 9 F water in a beaker 1 which is graduated to 600cc and place the beaker LE the center of the oven Start the oven at the highest power level Set survey meter dual ranges to 2 450MHz O 1 oR Using the survey meter and spacer cone as described above measure near the opening of magnetron the surface of the air gu
29. w Voltage Transformer Priman 1 The low voltage transformer is located on the Resistance control circuit board Terminals 2 Remove the low voltage transformer from the SLV 4290U PCB Ass y and check continuity 3 Normal resistor reading is shown in the table 1 2 Input 3799 3 4 Output7V 10 239 5 6 Output17V 31 9122 5 3 Magnetron 1 Continuity checks can indicate only an open filament or a shorted magnetron To diagnose an 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 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 9M9 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 9 5 Resistance between each terminal and chassis should read infinite 5 5 High Voltage Diode Isolate the diode from the circuit by disconnecting its leads 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 t
30. w securing air cover Remove the air cover Remove screws securing the magnetron to the wave guide Take out the magnetron very carefully Remove tow from the back panel of fan motor assembly Take out the fan motor assembly Remove the oven lamp by rotating to pull out from hole of air cover NOTE1 When removing the magnetron make sure that its antenna does not hit any adjacent parts or it may be damaged 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 1 1 Installation Instructions CAUTION THIS OVEN WAS MANUFACTURED FOR USE IN A RECREATIONAL VEHICLE ONLY THIS OVEN REQUIRES INSTALLATION INTO A CABINET STRUCTURE ONLY THIS OVEN IS NOT DESIGNED FOR USE IN NON CABINET INSTALLATIONS OR FREESTANDING APPLICATIONS 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 SCREW Trim to cabinet SCREW 2 Fig 1 27 Fig 2 Trim to outcase OVEN INSTALLATION ALIGN THE SCREW HOLES ON UPPER AND LOWER TRIMS TO THE HOLES ON THE TOP ENCLOSURE AND BOTTOM ENCLOSURE AND SECURE SCREWS Fig 1 PLUG POWER CORD INTO RECEPTACLE AND SLIDE OVEN INTO CABINET SECURE OVEN TO CABINET THROUGH HOLES IN UPPER AND LOWER TRIMS Fig 2 OVEN FEET MUST SIT ON CABINET

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