SERVICE MANUAL Microwave Oven EM
Contents
1. COMPONENT CHECKOUT PROCEDURE RESULT Check each voltage at connector 5104 and S105 Normal reading after removing each connector female from power POWER circuit board Connection RCB Pin No 3 Ground and 4 5 1 2 at S105 Pin No Voltage V Pin No 1 and 2 at 9104 S105 3 to 4 DC 12 CAUTION 3 to 5 DC 16 Proceed with the test only after removing the 3 to 1 DC 30 wire leads from the primary winding of high 3 to 2 DC 35 voltage transformer for your safety S104 Test procedures 1 to 2 AC 2 4 a Make sure that the power supply cord is not plugged in b Remove the connector S104 and S105 from the power circuit board c Plug the power supply cord d And then measure each voltage Measure the voltage Between test points TP 1 CONTROL 25i 2 TP 8 and ground See figure 14 on page Test point P C B TP Voltage V Note Proceed with the check of the control P C B to TPA DC 5 see if any one of the measured values is differ TP 2 DC 12 ent from the specified values TP 3 DC 16 TP 4 DC 35 COMPONENT CHECKOUTPROCEDURE RESULT Measure the resistance between terminals of e TOUCH KEY connector after removing it from S110 BOARD Figure 10 NOTE When reconnecting the connector make sure i the connector are properly inserted to the When checking 900 w iun Sorineetor 110 ohm meter to the terminal 12 to 1 MATRIX CIRCUIT FOR SWITCHBOARD POW Comp Display POR2. No continuity No continuity No continuity Voltage N incorrect Voltage N incorrect Resistance incorrect Resistance incorrect Resistance incorrect Contact on No continuity Shorted Shorted REMEDY Reconnect Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace or Adjust Replace Replace CONDITION TROUBLE CHECK RESULT REMEDY gt Transformer Shorted Replace gt H V Capacitor Shorted Replace gt Magnetron gt Shorted Replace gt H V Diode gt Shorted Replace gt Fuse Diode gt Shorted gt Replace Low microwave gt Magnetron ERES Poor f Replace output oscillation Uneven heating Rotation of top or Rotation gt Repair or bottom anttena stop replace C ERROR INDICATION This model has some self diagnosis functions Display shows E depending on the trouble DISPLAY Trouble Situation E 21 Thermistor for duct of cavity top is operated by Buzzer will continuously beep tone Blower over heating of 120 C motor will stop immediately Then oven will stop heating E 31 Thermistor for lower magnetron or duct is Blower motor will stop immediately Then shorted oven will stop heating E 32 Thermistor for lower magnetron or duct is dis Oven will stop heating connected or removed from connector socket Blower motor will be ope
3. 0121 AL porom 10K Rise 30 rae tx 5302 XA 2P B1 c0101 R0101 5V si1o O22 MPGOSS 5308 posteo 1000p 6 100k 6 XA 13P 32 poa temi Ro AE ou SKART 86303 5w302 22 pos toni 13 bui LE bol 9 ego 54 i Pog PD t3 ur EL 55 4 o 0 0 0 POLIPO ee 56 RH W Sw301 60 PD 18 ar 12 aio 101 Ty ILLI M l i5 ATs 3 50 2 i ee Gy H0 iz soms eros d es Re 00 COM 33 10x 7 8301 XA 3P 22 te rl E0121 34 10K 5V kaoz 502 L R L 5 143 1008 25034 zn MS QS T ve 180w 360W 2900W 18 LEDI bet EI R304 DI ot vt lt il 1800V s E T o Lud e Ex e at s pzsov 7 00 t p 8 t 10K 10K oo 8 R189 10K f 2119 n ge 11 ree 29 0115 j nto 53819 re oa 8V jc 0114 1n 80V C3399 2120 d ro ee moe noes ea wom tg ATK 200r 3 10K 1 Ride D 10 Ty GBON 0113 47K x Toe 1348 SY er Mene E aK 1 mel RIA P TK 0148 VREF 3 R140 B TK pias AVES 32 35 f PES Riga 2 7K D147 vss T er AA Je 28 PON aa mien 2 0148 2 AINTO Sear 19 9110 A1349 was 1000P 5 x a R601 aioe C3402 i MEN S s 1 Pree tox C iok Vo i30 8130 ATUM Aas La bye 2T0n 2 AW 4 d i gt I EF 0115 di0T c3402 ior E Mas 10K I 35V M o n MEN ae BOF Ae 270092 peicPa 84 tox q l qr
4. Turn the TIMER KNOB to left until display r 1 nf is shows O cod d 0 c pde eThe total cooking time appears in the 5 display for 5 seconds Touch START key first and also touch oo 2 a POWER SELECTION key until display changes f ml amp 0 appears in the display L IINE eC P t D Indication of remaining cooking time The volume of the buzzer when cooking is interrupted by door opening 1 To cancel remaining cooking time Operation Display window D e Turn the TIMER KNOB to left until display i shows 0 XO UE e The display indicates number of current eTouch START key first and also touch 2 POWER SELECTION key 170W until display changes p BGI 8 Turn the TIMER KNOB to change setting 3 When you don t change setting skip steps 3 od d ENSE 9 0 8 in the displa Li ppears in the display 4 Volume of buzzer is set cod 18 12 PES 8 EXPLODED VIEW AND PARTS LIST Main body Parts 1 eee eee eee eee eee 10 Parts marked with this sign have special Characterstics important for microwave leakage When replacing any of these parts use only Manufacturers specified parts 13 N UN N Parts marked with this sign are supplied with high voltage exceeding 250V
5. Hieh Voltage tranatermer Trenetormateur s haute tension Hoegspann inga tranatormator 5 Kendenaator Capacitor condensateur lt Condensator 4 2 t F4 F Mes asa EE Maonetron Seu Magn tron PERI Lo S55 LE H GLELCHRICHTEUR REDRESBEUR 5 AMBM BEUHGERAREMAROUER IMPORTARTER d L ventilati Histo C SCHALTPLAN FUER DAS MODELL CIRCUIT DIAGRAM FOR MODEL MANUEL SCHAKELDIAGRAM VOOR MODE NOISE FILTER CONTROL PRINTED CIRCUIT BOARD SICHERUNBOLE icHRICHTEUR PUSIBLEREORESSEUR GLE TCHR ICHTEUR REDRESSEUR s INTERLOCK RELAY RLI RLA RLB RLG DE SERVICE POUR L EM C1800MK POWER PRINTED CIRCUIT BOARD 104 S108 DISPLAY PRINTED CIRCULT BOARD START SW COM OQ Ez TIMER SW T r aensor achaitter Door sensing switch interrupteur sensitif de porte Deur sensor schaketaar Hochspannungee transformator High voltago transformer Trenaformateut haute tension Hoogasanninga tranaformater Kondensator Capacitor Condensateur Condensator 1 2 Magn tron e UEBER 260V iuo lg ons OIE MIT DIESEM ZEICHEN VERSEHEN SIND F UEHREN HOCHSPARNUNG e TAN MARQUEES DE CE SPIGHE SONT HOUS NAUTE TENSION SUPERIEUREB ELGERRCHAPTER DIE FUER DIE LECKSTRAMLUNG BEI MIKROWELLEN WICHTIQ BEND SOLLTE CINEG OIEBER TELLE AUSQEVECHRELT WERDEN BITTE NUR YOR BE
6. Parts marked with this sign have special Characterstics important for microwave leakage When replacing any of these parts use only Manufacturers specified parts 14 Main body parts 1 KEY NO SERVICE PART NO DESCRIPTION G O un amp Q e 617 120 2854 617 055 9584 617 123 9942 617 208 1472 617 196 9184 617 078 3132 617 140 1332 617 179 6087 617 202 7845 617 120 4230 617 120 4148 617 120 3387 617 149 3009 617 077 6356 617 120 3370 617 202 5261 402 061 1505 617 131 3789 517 214 1633 617 206 7506 617 192 2110 617 202 0150 617 214 1619 617 130 4879 617 209 9422 617 120 3325 617 212 8535 617 121 9265 617 217 5911 617 120 3349 617 120 3332 617 207 6836 423 018 7609 617 195 1295 412 006 9800 617 214 4801 617 125 3832 617 140 1349 CABINET FRAME PLATE ASS Y INSU SHEET CORD ASS Y GERMANY CORD ASS Y UK CORD BUSH UK CORD BUSH GERMANY FRAME B C T INSU SHEET SHELF ASS Y STIRRER GUIDE LIGHT OPENING COVER LAMP P C B COMP LAMP SOCKET CAVITY COVER THERMISTOR ASS Y CERAMIC RES 25 J RELAY P C B COMP CONTROL P C B COMP NOISE FILTER TERMINAL PLATE P C B COMP RELAY POWER HARNESS GEAR MOTOR ANTENNA SHAFT ANTENNA BEARING CLIP ANTENNA LOWER SPECIAL NUT ANTENNA UPPER CLIP FUSE 250V 10 SPECIAL WASHER SCR TRS 4X12 FRAME REAR PLATE ASS Y BOTTOM BRACKET UK BOTTOM BRACKET GERMANY 15 15 SUS amp
7. 2 8908 617 122 6379 617 120 3394 411 004 3508 517 080 3830 617 080 5179 617 080 5186 411 055 0202 DESCRIPTION BLOWER COMP MAGNETRON 2M254 M THERMOSTAT 150C DUCT MAG UPPER DUCT MAG LOWER CAPACITOR 1 0MFD FERRITE Q TY MICRO MICRO MICRO SWITCH MONITOR SWITCH DOOR LATCH SWITCH DOOR SENSING LATCH LEVER LATCH LEVER LATCH LEVER SPRING SPRING SPRING LEVER STOPPER HARNESS WITH H V DIODE HV TRANSFORMER SPECIAL SCREW CLIP GROMET FILTER ASS Y NUT HEX FLG W SRT 5 SPECIAL SCREW SPECIAL WASHER SPECIAL WASHER NUT HEX 5 48 5 18 BM C1800IHK NGT O3EN 150C 8400R 8400R 1 0 HF70RU 16 28 9 V 5220D 502 V 5930D 013 V 5330DK SUS304 WPB DO 65 US304 WPB DO 65 SUS304 WPB DO 6 6 G 15 N5T C1850 US 430 D TO 5XD7 3XD13 SPG T1 0XD5XD13 5 k2 PJ pS oh R A BR PQ oe 55 deb 155 deb deb DO PQ RA RBS P2 Door parts KEY 1 2 3 4 5 6 7 9 SERVICE PART NO 617 201 9697 617 201 9680 617 120 3110 617 120 3127 617 120 3073 617 130 4862 617 121 5489 617 178 0734 617 178 1441 617 178 0840 617 120 3028 411 089 2500 617 080 3847 617 068 3623 617 068 1087 617 140 5392 617 068 3579 DESCRIPTION Q TY DOOR HANDLE DOOR BASE ORNAMENT PLATE ORNAMENT PLATE DOOR COVER DOOR PANEL PACKING DOOR ASS Y DOOR PANEL CHOKE DIELECTRIC HINGE WASHER F 5X10X0 8 SPECIAL SCRE
8. 30 TO 6 TO KABELMETAL HO7RN F SR 31 2 LGCC T1 2 TO 4 P P TO 1 240 250V 25M E 14 PAO 2A250V T150 70 8 MTST ERF 20HMJ250 LY2F T2 T115 CB 70921 M2CJ29AA49 H UL AL PFA AL AL AL MPS 04 0 250V TLC 10A LGD T1 2 60160 Q bappa gn pa RO PO P r5 PS PO ps de de ol pA R Rh PO 2 peo e deb p geb de geb TY Main body Parts 2 Q l lt Parts marked with this sign are supplied with high voltage exceeding 250V Parts marked with this sign have special Characterstics important for microwave leakage When replacing any of these parts use only Manufacturers specified parts Parts marked with this sign are supplied with high voltage exceeding 250V Characterstics important for microwave leakage When replacing any of these parts use only Parts marked with this sign have special Manufacturers specified parts 17 Main body parts 2 KEY NO SERVICE PART NO nn 9 GF IE FO PO PQ PO PQ FO dee gt peb pei eh qe qn ge SO C Ano 9 L4 PO R D C QC Xn WN 0 617 196 9245 415 002 6408 617 214 7628 617 120 3431 517 120 3448 617 206 8220 617 181 2206 617 004 5230 617 160 0438 617 004 3724 617 178 1182 617 178 1175 617 178 1168 617 178 1205 617 178 1212 617 187 2217 617 178 1151 617 214 6553 617 214 4474 617 080 4196 617 12
9. 40 Pu PD ED S 8 pea 29 100K ZAN3 21 VENTRI C123 HT 30 100K dp NEN J Riga tad 10K 3 MW 2 he C110 0133 a ETT d ATK EE sov 9s an 1 E AME sy 22 22 H i AEE i SIA REPRE CONTROL CIRCUIT BOARD P N 611 214 1633 RT7O4 R702 O crag 05 P OT E MCI3 8 3 0 o Ba sii 8 3 7o Q S ee 1 4 03 o Jm Bm mga S n ROR i Je 5110 ls 3 ors 541977 VE T Ri g e O RBIOI Di59 pig S108 Siis goo ALR ee 8 Ohh CBI02 ag Juo Wo 48 Rie RAS ML C RIT RB C gt RUG C lt JUT EZ np U aS 5 amp P Wu TP 3 3120 GE s R26 gt aro sO RI i er E 2 08 te e O o 21m Oo X Il ODA 9 E 58 5 gt IUTE Re onz lt 16 Ox JB108 a oz 5 j TP 4 amore SOS 11 oy c 160 8 g es SSR a hse Ok oa SEES Ne TP 2 ep P Co R139 J8104 bcc e 5 Cmm RF RE 222 RIQ6 1 lo 103 ENDRAR cista g ROS Sese RUD oo Bf gt OR la S6 188008 s TP 1 8 at 389 Ono Dios eue Ground s2 OE co P 2 Q ts n S 8 5501 BRNE Figure 12 SANYO SANYO Electric Co Ltd Osaka Japan 23
10. A BUDE R102 10K 103 5 9 x RUE tese ony FILTER NOTIS PRINTED CIRCUIT BOARD i ue E x orienter cc hr gap Bh amp lo amp lo DAY K W r l rj r z x a val irl 7 id r M Sel Sol ELU aco zig MONITOR aw Q i ra DA MONITOR j pet m Q ie L BLT Sp Sp NIA ET i2 429 oo H Vv te R v WO jg TRANSFORMER a TRANSFORMER ern P w l i cis B L ced 0 Juri MAGNETRON UPPER By 1 XA 3 TL o cii miza RIEZ 10K D ae vsti vst2 3104 9 01u 10K 3 4 BP 0 OPENO 5 O OPEN 1 BY OPENO a OPEN cis 8105 c20 1 R20 1k ae pA 2084 r 1 011 MPOOSG ROS 6E553 K Fn ME amp Di3tsp2 mo i 000m 3 joo an 7168Y z E ad 051 Gh ae 2R MPGOSG e o J y Lo 52 ai1781214 3 5Y 0108 C3402 piza 1000 45 O aR ALLA LORS Era o t Meneses T O a5v 53 aae O VF bad koe FTE PUM 1600 104 21 u az 23 PER HM BY PLB eno cits i Pt4 pD C115 102 45 sy 1000 3103 jp Door PLUM 29 7 80v 27K z sensing 46 20 R187 sv PL2tror 4 AYJ ton 6 81u BOV 1 EN 18
11. ATIONS Microwave output 1 800W to 180W Frequency 2 450MHz Power supply 230V 50Hz Rated current 13 Amp Safety Device Thermal limitter Magnetron 150 C Open 80 Close Thermistor Magnetron 200 C Open 108 C Close Thermistor Duct 120 C Open Fuse Cartridge Type 250V 10A Micro switch Relay Primary interlock Switch Interlock monitor Switch Door sensing Switch and Relay RL 3 and 4 Max input time Electronic Digital up to Manual 10min Memory 30min Overall Dimensions 422 W x540 D x335 H mm Oven cavity size 330 W x330 D x230 H mm Effective Capacity of Oven Cavity 19 1 liters Net weight 32Kg 3 POWER OUTPUT MEASUREMENT 1 Prepare 1000 5g tap water 2 Adjust water temperature to 10 12 C 3 Pour water into a container made of borosilicate Glass 190mm outer diameter cylinder maximum 3mm thickness Note Use the container kept on the room tem perature 4 place the container on the center of oven cavity 5 Set the heating time for 27 seconds and rating full power and then start oven 6 Take the container out immediately when heat ing time is up 7 Stir water for making even water temperature in the container 8 Measure water temperature Water temperature rise sh
12. BSTELLER ANGESEGLH ERBATZTEILE VERVERDEN LES PIECES MARQUEES DE CE SIGNE ONT GES SPECIPICATIONS IMPORTANTE POUR L TMPERMEAGILITE AUX MICRO ONDES EN CAS DE L UNE DE CES PIECES N UTILISER QUE DER PIECER ME DU FABRICANT DIEBEM ZEICHEN VERDENEN BING HABEN BRPEZIELLE BECOHDARY INTERLOCK LATCH INTERLOCK pons RELAY 8 WiERLOCK MONITOR SERS iNO SVITEN WITCH BELAY 432 2 8955 20800 6 TEST PROCEDURES AND TROUBLESHOOTING DISCONNECT THE POWER SUPPLY CORD FROM THE WAL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES ON PRIMARY WINDING THE HIGH VOLTAGE TRANSFOREMER SEE FIGURE 3 A TEST PROCEDURES CAUTION Primary winding Nd Secondary Windings Filament Windings Rx1 scale 2 Check for resistance Between each filament terminal of the magnetron and the chassis ground with an ohm meter on highest scale COMPONENT CHECKOUT PROCEDURE RESULT 1 Check for resistance Across the filament ter Normal reading MAGNETRON minal of the magnetron with an ohm meter on Less than 1 ohm Normal reading Infinite ohms HIGH VOLTAGE TRANSFORMER 1 Measure the resistance With an ohm meter on R x1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance with an oh
13. FIGURE 10 CHECKOUT PROCEDURE FOR SWITCHES Disconnect the lead wires from the switches and check for the continuity of the switches connecting an ohm meter to its terminals SWITCHES DOOR DOOR SEE Figure 1 on page 1 CHECKOUT PROCEDURES OPEN CLOSE PRIMARY INTERLOCK Terminals COM and NO a CA L DOOH SENSING eel o aa I INTERLOCK MONITOR Terminals COM and NC 3 esser CAUTION After checking the switches make sure that the interlock monitor switch is properly connected according to the CIRCUIT DIAGRAM on page 3 Power is applied with normal voltage Timer is set Touch Select key TROUBLE y No display cooking time _ Cooking opera tion will not start gt Oven dose not heat up Fuse 10A blows off immediately CHECK Connection of S110to S107 Power circuit board See page 6 Control circuit board See page 6 Primary Interlock switch See page 7 Thermal protector Door sensing switch See page 7 Control circuit board See page 6 Control circuit board See page 6 H V Transformer See page 4 H V Capacitor See page 5 Magnetron See page 4 Monitor switch See page 7 Blower motor Step down Transformer m i i i RESULT Poor Contact Voltage incorrect Voltage incorrect
14. SANYO SERVICE MANUAL Microwave Oven EM C1800MK ermany EM C1800MKw x dd d AA Model No Pro Code No EM C1800MKSD 437 477 00 EM C1800MKUK 437 477 01 Foreword Read this manual carefully especially precaution on microwave energy and follow the procedure strictly careless servicing and testing may expose yourself to the microwave energy leakage PRECAUTIONS 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 operated with the door open b Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 Interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual befo
15. W DOOR ARM DOOR LATCH SPRING ARM PIN PO PO PO Dj PO deb geh geh PQ deb qeb 19 19 Control panel parts Control panel parts KEY NO SERVICE PART NO DESCRIPTION 8 TY 1 617 193 6100 CONTROL PLATE 1 2 617 206 0873 CONTROL PLATE WINDOW T2 0 1 3 617 193 6094 CONTROL BASE ABS 1 4 617 130 9348 ORNAMENT ASS Y 1 5 617 073 7616 CAVITY PACKING 1 6 617 073 9672 PACKING COVER SECC TO 6 1 7 617 211 2671 P C B COMP DISPLAY 1 8 617 192 5920 P C B COMP TIMER 1 9 617 206 9203 SWITCH ASS Y TIMER 1 10 617 193 6315 KNOB BODY ABS 1 11 617 213 8596 PARTS BASE LGCC T1 0 1 12 617 208 3377 CONTROL COVER TO 1 1 13 617 213 8619 SPACER 1 14 617 214 6676 OPERATING INSTRUCTIONS 1 Packing parts Items Not illustrated KEY NO SERVICE PART NO DESCRIPTION Q TY 1 617 214 6577 CORRUGATE BOX COMP 1 2 617 195 1035 CORRUGATE BASE COMP 1 3 617 195 4296 BODY CUSHION BED UPPER 1 amp 617 120 3776 BODY CUSHION BED LOWER 1 5 617 195 1066 BODY CUSHION BED LOWER 1 20 20 9 OVERALL CIRCUIT DIAGRAM m uud TT e yi 7 k P i ok E 109 5108 XA OPt SP CPR2411GM lt cm o Ji In dm O A m c 4 5 a 63 e x i i i i 1 i i H A m es Ee m cee ee rt cso t rri n ar reo me oen o DT1 2 6 i ico i Q io5 s108 BP XA GP RLOL 10K BY Q B a R10 e S2 X
16. all be 8 to 12 C 4 PRECATIONS AND REPAIR SERVICE TIPS PRELIMINARY A SINCE NEALY 4 000 VOLTS EXISTS IN SOME CIRCUITS OF THIS MICROWAVE OVEN RE PAIRS SHOULD BE CARRIED OUT WITH GREAT CARE B TO AVOID POSSIBLE EXPOSURE TO MICRO WAVE ENERGY LEAKAGE THE FOLLOWING PRECATIONS MUST BETAKEN BEFORE SER VICING 1 Before the power is applied a Open and close door several times to make sure the door interlock switch and interlock monitor switch operation properly Listen for the clicking sound from switches make sure the interlock monitor switch is closed after the latch interlock switch is open when the door is opened See pages 1 and 8 b Make sure the perforated screen and the choke dielectric of the door are correctly mounted 2 After the power is applied a Open and close the door to see if the interlock mechanism operates properly b Check microwave energy leakage with a leak age detector and confirm the energy leakage is below 5mW c tu 3 Do not operate the unit until it is completely repaired if any of the following conditions exists a Door is not closed firmly against the cavity front b The hinge is broken c The choke dielectric or the door seal is dam aged d The door is bent or warped or there is any other visible damage to the oven that may cause microwave energy leakage Note Always keep the seal clean e Make sure that there are no defective parts in the interlock mechan
17. ary adjustments or replacement of switch by the reversing step 2 and check mi crowave energy leakage according to 1 AD JUSTMENT PROCEDURE FOR SWITCHES on page 1 after it is replaced with new one and check proper operation of it according to CHECKOUT PROCEDURE FOR SWITCHES on page 7 WHEN REPLACING ANY DOOR MICROSWITCH REPLACE WITH THE SAME TYPE SWITCH SPECI FIED ON THE PARTS LIST C REMOVING FUSE Remove the 10A fuse with screwdriver NOTES When replacing the 10A fuse be sure to use an exact repair part If the 10A fuse blows immediately check the primary interlock switch the relay 3 and 4 on the control cir cuit board and the interlock monitor switch according to CHECKOUT PROCEDURE FOR SWITCHES on page 8 and make sure to check the microwave en ergy leakage according to 1 ADJUSTMENT PROCE DURE FOR SWITCHES on page 1 when the primary interlock switch the relay 3 and 4 or the interlock moni tor switch is adjusted or replaced 10 If the primary interlock switch the relay 3 and 4 or the interlock monitor switch operate properly deter mine which of the followings is defective control cir cuit board blower motor gear motor high voltage trans former high voltage capacitor high voltage diode or magnetron If the high voltage diode is defective replace not only the high voltage diode but also the fuse diode D REMOVING DISPLAY CIRCUIT BOARD 1 Disconn
18. ect all lead wires of the Control panel from the Control PCB and Power PCB 2 Remove 4 screws securing the Control panel Ass y to the oven cavity 3 Push up and pull out the Control panel Ass y 4 Remove 4 screws securing the Display PCB 5 Take out the Display PCB and push up the lever end of the plastic fastener and remove the FPC connector from the connector socket S101 CAUTION When replacing new Display PCB please take big care that all 4 LED heads shoul dexacty be in serted into the square holes of control frame all at once Never force to push any LED lead in the PCB E REMOVING MAGNETRONS 1 Remove 2 screws securing the thermal limitter 2 Disconnect 2 lead wires from the magnetron terminals by removing 2 connectors 3 Remove thermistor lower magnetron by pulling horizontally 4 Remove 4 hex nuts upper magnetron or 2 hex nuts lower magnetron securing to the waveguide 5 Remove lower magnetron 6 Take out the magnetron VERY CAREFULLY NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave make sure the microwave energy leakage is below the limit of the regulation bmW cm F CHANGING POWERSUPPLY CORD See explod
19. ed view on page 15 1 Unfasten 1 screw for earth and pull out 2 wires of power cord from terminal plate 2 Remove1 screw for bottom bracket of cord bushing 3 install the new power supply cord with reverse procedure of above 1 to 2 WARNING For the changing the power supply cord never use other than following Key No Order No Parts Name 4 6172081076 Power cord Ass y Germany 5 617 196 9184 Power cord Ass y UK 6 617078 3132 Cord bush UK 7 617 140 1332 Cord bush Germany 39 617 125 3832 Bottom bracket UK 40 617 140 1349 Bottom bracket Germany G REMOVING CERAMIC TRAY ASS Y See Fig 11 1 Take off the cabinet 2 Put insert a screwdriver in the 9 mm diameter hole locating at lower hinge of left side of the oven cavity And push the tray up with the screw driver 3 Open the door and take out the tray very care fully Door Screw driver Figure 11 11 H REMOVING DOOR Remove 2 hex nuts securing the upper hinge remove 3 hex nuts securing the lower hinge and remove1 special screwsecuring the door arm located at the bottom of the door sash NOTES After replacing the door be sure to check that the primary interlock switch the door sensing switch and the interlock monitor swich operate normally See pages 1 and 7 After replacing the door check for microwave ene rgy leakage with a leakage detector Microwave energy leakage must be below the limit of 5
20. h body on the door sensing switch when the door latch is securely locked 3 Tighten the lever stopper screws securely 4 Make sure the interlock monitor switch closes af ter the primary interlock switch opens the door is opened very slowly according to CHECKOUT PROCEDURE FOR SWITCHES on page 6 5 Make sure the interlock monitor switch opens be fore the primary interlock switch closes when the door is closed very slowly according to CHECK OUT PROCEDURE FOR SWITCHES on page 7 Test Procedures and Troubleshooting 4 9 Disassembly Instructions 10 312 Exploded View and Parts List 19 20 Overall Circuit Diagram 21 23 6 Make sure the microwave energy leakage should be no greater than 5 mW cm to allow to measure ment uncertainty when measured with a detector All service adjustments must be made for mini mum microwave energy leakage readings NOTE If the interlock monitor circuit operates and at the same time the fuse blows with the door opened be sure to replace the control circuit board because relay 3 and 4 on the control cir cuit board the door sensing switch and the elec tric circuit related on the door sensing switch which act as Secondary Interlock switch Interlock monitor switch Latch Lever Primary Interlock switch Latch Lever Door sensing switch Screws Figure 1 2 SPECIFIC
21. ism f Make sure that there are no defective parts in the microwave generating and transmission as sembly especially wave guide 4 Following items should be checked after the unit is repaired a The interlock monitor switch is connected cor rectly and firmly b The magnetron gasket on the magnetron is properly positioned c Waveguide and oven cavity are intact No leakage of microwave energy d The door can be properly closed and the safety switches work properly e The oven must be stopped when the door is opened or the time is up The oven must not be operated with any of the above components removed or bypassed HINT FOR LAMP CHANGE Before removing the cabinet pull out the main plug If you want to check the new lamp with the open Cabinet take care of the following safety cautions Do not touch live parts The lamp holder is not con nected to the earth protection lead by a metric Screws 5 CIRCUIT DIAGRAM AC230V 6OHE Retr Power Supply Alimentation Netvoeding Seblasemotor Blower motor thnenraumi iont CGavity ttoht Lumiere du compartiment amp innenverttohting e verrienelunosachaiter Laton interlock swttoh interrupteur de Verroul Liege vererendelachekelaar Interlock Monitor Switch Temperaturbeodrente ungaeschatter Thermal Limit avitoh interrupteur de lime itation de le tempe ratura Thermoataetschake alear Hochepannunen transformator
22. m meter on highest scale a Primary winding to ground b Filament winding to ground Normal reading Approximately 1 0 ohms Less than 1 ohm Approximately 60 ohms Normal reading Infinite ohms Infinite ohms Note Remove varnish of measured point COMPONENT CHECKOUT PROCEDURE RESULT HIGH VOLTAGE CAPACITOR Including bleeder resistor Measure the resistance Across two terminals with an ohm meter on highest scale Normal reading Momentarily indicates several ohms and gradually to 10 meg ohms Abnormal reading Indicates continuity or 10 meg ohms from the beginning HIGH VOLTAGE DIODE Measure the resistance Across two terminals with an ohm meter on highest scale Normal reading Indicate about the middle position in one direct forward and infinite ohms in the reverse direction using meter with a 9 volt battery NOTE Some digital meter may show over even in a forward direction because low mea suring voltage of meter does not allow the meter to pass through the high volt age diode Abnormal reading Indicates continuity or infinite ohms in both directions FUSE DIODE Measure the resistance Across two terminals with an ohm meter on highest scale Normal reading Indicate infinite ohms in both directions Abnormal reading Indicates continuity in both directions or continuity in one direction and infinite ohms in reversed direction
23. mW c tu I HOW TO RESET THE MEMORY OF ACCUMU LATIVE COOKING TIME 1 Push the keys step by step as follows Turn the Timer Knob to left until display shows 0 Touch START key first and also touch POWER SELLECTION key 1800W until display changes The display will show accumulative cooking time in the display window 2 Then push the POWER SELLECTION key 1800W during cooking time appear in the display 3 Push the POWER SELLECTION key 1800W for 4 seconds continuously Accumulative cooking time will be cleared J CAUTION FOR CUSTOMER ON OPENING AND CLOSING DOOR When the Microwave oven is in operation should the customer open the door slightly and close the breaker of the house will occasionally be cut off It is necessary to explain to the customer not to exercise such matter When the Door is opened slightly between 2 or 3 mm distance primary interlock switch turn OFF and operation stops However door sensing switch will remain ON and if door is closed primary interlock switch activates and operation resumes immediately At such time microwave oven will start any time Therefore a big In rush currnet flows and thus Breaker will be cut off CHECKING ACCUMULATIVE COOKING TIME NUMBER OF DOOR OPERATIONS AND CONTROL OF THE BUZZER SOUND ci The number of door operations 100 times Accumulative cooking tima Operation Display window
24. rated U 10 Thermistor for Magnetron is operated by over Buzzer will continuously beep tone heating of 200 C Blower motor will stop immediately t Then oven will stop heating U 50 The purpose of this function is to prevent opera Open and close the door and then touch tion when there is no food in the oven the key before 1 minute passes 7 DISASSEMBLY INSTRUCTIONS OVEN MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPLACEMENTS REPAIRS ADJUSTMENT AND CONTINUITY CHECKS BEFORE PROCEEDING WITH ANY RE PAIR WORK AFTER DISCONNECTING WAIT AT LEAST 1 MINUTE UNTIL THE CAPACITOR IN THE HIGHVOLTAGE AREA HAS FULLY DISCHARGED A REMOVING PRIMARY INTERLOCK SWITCH See Figure 1 on page 1 1 Disconnect all lead wires from the primary in terlock switch 2 Remove 2 screws securing the lever stopper 3 Remove 1 screw securing the switches Then pull out the switches 4 Make necessary adjustment and make micro wave energy leakage check according to 1 AD JUSTMENT PROCEDURE FOR SWITCHES an page 1 after it is replaced with new one and check proper operation of it according to CHECKOUT PROCEDURE FOR SWITCHES on page 7 B REMOVING INTERLOCK MONITOR AND DOOR SENSING SWITCH See Figure on page 1 1 Disconnect all lead wires from the interlock moni tor switch and door sensing switch 2 Remove 1 screw securing the these switches Then pull out the switches 3 Make necess
25. re the oven is released to the owner REFERENCE NO SM 640177 TABLE CONTENTS Adjustment 1 SPCCIICALONS u s u u iass 2 Power output Measurement 2 Precautions and Repair Service Tips 2 Girc it Diagramo R L a R LA Sam uuu Ra 3 CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPLOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENE RATING DEVICE IF IT IS IMPROPERLY USE OR CONNECTED ALL INPUT MICROWAVE CONNEC TIONS WAVEGUIDE FLANGES AND GASKETS MUST BE SECURE NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED 1 ADJUSTMENT PROCEDURES TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE THE FOLLOWING ADJUST MENTS OF THE INTERLOCK SWITCHES SHOULD BE MADE ONLY BY AUTHORIZED SERVICE PER SONNEL PRIMARY INTERLOCK SWITCH INTERLOCK MONI TOR SWITCH AND DOOR SENSING SWITCH JUSTMENT Figure 1 1 Loosen 2 screws securing the lever stopper 2 Adjust the lever stopper position so that it is pushed up and pull backward until there is about zero gap between the latch lever and the switch body on the door primary interlock switch and the at the same time there is about zero gap between latch lever and the switc
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