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SERVICE MANUAL R-939(BK) R-939(IN) R-939(W)

Contents

1. or YOLON i ma gt LHM ITEVINYNL z Q E AJO NLL e 3 LHM 6 NEE 9 MIA y 9 HINYOASNVUL 3 JAIM AH MIA 2 OIL 2 NOULINOVIN IND SININOdNO9 ADVLIOA H9IH YOLON BES MN AUD nog SAR gt 8 V NO AM Oi MA K a a
2. AOS 3NL 0 AOS 40 AGZ 3N 00 031410345 LON 41 1 810 SSESSI 021410348 LON 41 DE YSF MOL L 031412395 LON 31 ts gt nosan yo LON SEL 1219 2 r8d 99 191 ZNIVIN s8d s9 191 LNIVIN EZIO Il 4 98d re Lo NIVIN ZZO 0 28d e9 191 LNI LWOO ZOD AOS ANL O 1210 0 4 z9 101 OG EROS ro ons 1 a 1 d 19 191 ano9 52 58 gt deo 2 Zed o9 L01 ZA 1935 A d 69 101 EG 2935 93S 07 t 2 2 T FN Fo vea es 1ot 9935 pn 4 Dn 1935 2525 eazs 101 sa 81936 a a 2452936 y Sp Sp g d 9s L01 oq es H R 5 s 1245 IR IR UEdSS191 e 1293 2 19 2935 1938 21935 5 N 33 9LINOO 7936 5 sN 38 SLINOO 935 903 a fa a 11935 535 SG JR JA poas SJEF Es Eri 2935 00 121 ANS SINODO 2938 938 Le oe ZZHasvivsdaoTd ao1 L0d ES 191 14544 NG e 3 Eze 222 2 ITS 2592 T 92 2 S 2 8 8 A 2 ig 8 2 2 A Ircul tor Ci S 4 Indica 14 8 Figure R939 W 6 Jog and Switch Unit Circuit
3. IF NOT SPECIFIED 0 01uF 25V or 50V CN J IF NOT SPECIFIED 1 10W 5 id B13B PH K S 46 35 22 Ht p sw1 SW5 sw9 sw11 1C1 6 P73 AUTO EXPRESS T cook COOK Y eyes 1 sw2 de SW10 sw12 1C1 7 P72 WW 3 WATT c n SW7 swi3 1 1 8 71 NER OG AUTO ji BDO REHEAT STOP swa sw8 LLL RA 15 DARE g al zl 8 x da a x c FFFF 4 R72 R75 C60 C63 100K x4 330pF 50V x4 GND E 3 3 R52 1C1 77 AN4 A 2 2 VRI ET Ts T i L sis el 5 t c csit C50 218 238 R50 2 2 ES 1C1 18 P47 a0 AW 3 Boo 4 7K REI rh g SWITCH UNIT 1C1 22 INT1 4 A G So RSW 4 7K i Figure 5 5 Jog and Switch Unit Circuit 14 9 7 Printed Wiring Board Le fr 5 1 dC 2 R5 z O HS 5 gt d0 5 e 5 e D8 2 ES 8 3 gt R1 O ZD1 e r 4 RY8 lt N 3 O SB c2 4 Ee RY E lt pa E NI VAN MN Ha H9 2 NO zr VRS1 POWER CONT gt Figure S 6 Printed Wiring
4. Grill Heating Door Oven Cavity Elements Convection lt lt Passage O Convection 2 H Heating Element fl Cooling d Convection Turntable Motor H is Jj r Convection Roller Stay Turntable Motor Fan Figure D 2 Convection Cooking System 19 FIRE SENSING FEATURE The oven will stop its operation when there is a fire in the oven cavity in microwave cooking condition LSI measures the voltage across the temperature measurement circuit intermittently within 32 seconds time base since the oven is started in microwave cooking condition The oven will stop its operation when the difference of the voltage is more than 0 39 volts in microwave cooking condition 1 Within a 32 seconds base the thermistor is energized for 2 sec onds At that time the voltage across the temperature measure ment circuit is measured The oven carries out the procedure above again If the second volt age is 0 39V higher than first voltage LSI judges it is a fire in the oven cavity and stop the oven When LSI judges it is a fire in the oven cavity LSI will switch off the relays to high voltage transformer and fan motor and LSI stops counting down THERMISTOR oy OFF ON Sensing Voltage Sensing the voltage across temperature measurement circuit 20 OPEN JUDGE BY THERMISTOR 1 If the temperature of the thermistor does not r
5. 14 Turntable support 15 High Rack 16 Low Rack 17 Bakingtin 18 Square shelf 19 Square fin 2 TOUCH CONTROL PANEL Digital display and indicators 1 COOKING IN PROCESS indicator 2 GRIL indicator 3 CONVECTION indicator 4 MICROWAVE indicator 5 INFO indicator Operating buttons 6 INFORMATION button 7 LANGUAGE button 8 EXPRESS DEFROST button 9 AUTO REHEAT button 10 COOKING MODE dial Rotate the dial so that indicator points to appropriate symbol for microwave cooking mw for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL cor CONVECTION 11 CONVECTION button Press to change the convection temperature 12 TIMER WEIGHT knob Rotate the knob to enter either the cooking defrosting time or weight food 13 P START 1 min button See note NOTE This features is disabled after three minutes when the oven is not in use This feature is automatically enabled when the door is opened and closed or the STOP button is pressed 14 14 STOP button 15 CLOCK SETTING button 16 MICROWAVE POWER LEVEL button Press to change the microwave power setting 17 AUTO COOK button 18 EXPRESS COOK button 19 LESS MORE buttons 17 COOK AUTO gt REHEAT tb Se 16 GRILL HOTAIR R939 W CHAPTER 5 OPERATION SEQUENCE 1 OFF CONDITION Closing the door activates the monitored
6. 9 1 CHAPTER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER CHAPTER 11 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 1 BEFORE OPERATING 11 1 2 OUTER CASE REMOVAL 11 1 3 HIGH VOLTAGE COMPONENTS RE cansas 11 1 4 HIGH VOLTAGE TRANSFORMER RE A ete het 11 2 5 MAGNETRON REMOVAL 11 2 6 CONTROL PANEL ASSEMBLY RE MOVAL xoti ten Piana etd tedio 11 2 7 FAN MOTOR 11 2 8 TURNTABLE MOTOR REPLACEMENT 11 3 CONVECTION MOTOR AND CONVEC TION HEATING ELEMENT REMOVAL 11 3 10 POSITIVE LOCK en 11 4 11 OVEN LAMP SOCKET REMOVAL 11 4 R939 W CHAPTER 1 BEFORE SERVICING 1 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp Service engineers with Operation and Service Information It is recommended that service engineers carefully study the entire text of this manual so they will be qualified to render satisfactory customer ser vice WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE GREEN AND YELLOW EARTH NEUTRAL BROWN LIVE 2 WARNING Note The parts marked A are used at voltage more than 250V Parts List Anm Delar m rket me
7. y Latch hook b SW2 Stop switch SW3 Monitor switch SW1 Monitored latch switch Figure C 6 Latch Switches Adjustment CAUTION DO NOT DEFORM OR WARP THE TEETH OF COMB OF THE DOOR PANEL TO PREVENT MICROWAVE RADIA TION EMISSION FROM THE DOOR LATCH HEAD AND SPRING 11 Slide latch head upward and remove it from door frame with releas ing latch spring from door frame and latch head 12 Now latch head and latch spring are free DOOR HANDLE AND FRONT DOOR GLASS 13 Remove the two 2 screws holding the door handle and the glass stopper to the door frame 14 Remove the door handle and the glass stopper from the door frame 15 Slide the front door glass leftward and then slide downwards to release the tabs holding it 16 Now the front door glass is free 2 1 REINSTALLATION Re install the front door glass to the door frame as follows 1 Insert the upper edge of the front door glass into the tabs of the door frame 2 Slide the front door glass downwards and insert the lower edge of the front door glass into the tabs of the door frame 3 Slide the front door glass rightwards and insert the right edge of the front door glass into the tabs of the door frame Re install the door handle and the glass stopper to the door frame as follows 1 Insert the door handle and the glass stopper to the door frame 2 Hold the door handle and the glass stopper to the door fr
8. Cooking is not possible Proper temperature measurement is not obtained 14 Procedure N JOG AND SWITCH UNIT TEST If the display fails to clear when the STOP button tact switch SW13 is depressed first ver ify the wire harness is marking good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the wire 2 AUTO EXPRESS harness that connects the Jog and Switch unit to the control unit and make sure the SOOKE LOK sw2 Sw6 SW10 SW12 sensing switch is closed either close the door or short the door sensing switch connecter i WATT Use the Jog and Switch unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP button tact switch SW13 mark a ao ing momentary contact If the control unit responds by clearing with beep the Jog I cx reneat STOP Switch unit is faulty and must be replaced If the control unit does not respond it is a faulty ST EXPRESS and must be replaced If a specific button does not respond the above method may be used 1 DEFROST after clearing the control unit to determine if the control unit or Jog and Switch unit is at fault
9. I 2 2 5 S S 3 2 O SE a gez iJ 5 DO E 2 5 5 5 va 9 u5 ud 345 3 E Ze 555 2 ao zi x Q zi x 9 o e Y 5 1no Lno E 12 2 1no 1no 5 2 IVAS3HL 2 E 8 ANOD o uj ANOD u BOL 5 WL z wL E _ va ea 23 5 Tea a HINYOISNYYL O L 3E 6 MAWYOSSNVYL O L 3E 1no 1no 1NO LND LO 110 102 100 112 TYNSSHL TYNYIHL TYNSSHL OVN OL meo zo E OVN LOL TIO 201 vea x E g LU E ASN Cd AOS 400 MOSZ 4004 gt 0 ose 1900 7 MOSZ 400 E d MS0 P 089 L lo gt u G MS 0 M 089 m TOI NOE ra E m Lu 1102 NOISSZYAANS 3SION 3SION 36 A o 3SION l F C u Ts angr o9 auza oz Gc gt 7 3505 L4 AOSZIN 220 o n O 3snd bd AOSZIN 220 E A u HLIVA E o 3 Lr 2 E HLIVA SLA 9 IVELNIN 2 3 2 z gt GUAD Il WuLNSN SUNYA Sina e x gt 2 O E sina ZHOS AOEZ TTI i 8 2 om ZHOS AOEZ TTI 500030 2 lt EW Figure O 5 b Oven Schematic Dual cooking Condition Microwave and Grill 14 4 R939 W 2 Pictorial Diagram SanL Aelg YINYOISNVYL FOVL IOA HOI
10. MIA NS Eno Ino cium ON o ms ANOO LNO LND HOLVI L 9AY COL por Q3HOLINON LMS DEIA Me MIX I ler 3 N0 i wma IN3W37I ONLLVSH Sha NOILOSANOO HO MIA H es ad YOLON HOLIMS TAY la NOLLOSANOO Wo Xe ET TEES HH eem Woo ON falt S NO MIA ma el E ASD MIA ne a ojt 3SION NOI SOLON LHM YIdNVA LHM a bus ti FI HOLME ON THM rel v 8 eo gt YMS IL dL ank oi TL LHM E d e ehi v L 9 2 S ma S ST LHM AUD fo E y 999 gt 7 NOS M mm v m E 1 E il ab C 2 TE 3 HOLIMS NuO 2 4015 1 ATddNS ZMS NO riio ino 1n2 NUS TANVd TOULNO9 ER IVAYIHL Zo dAV1N3AO mem VETT 2 ONLLV3H e THO HO YOLSINYIHL SN Figure S 1 Pictorial Diagram 14 5 R939 W 3 Power Unit Circuit c3 C1 D10 OVEN Ti Eh SINB10 end WH1 4 THERMISTOR WH1 3
11. ond approximately P x t 4 187 calorie is generated On the other hand if the temperature of the water with V ml rises AT C during this microwave heating period the calorie of the water is v x AT The formula is as follows P xt 4 187 Vx A T 0 55 x mc T2 T0 4 187 P W 4 187 x V x AT t 0 55 x mc 2 Our condition for water load is as follows Room temperature TO around 20 C Power Supply VoltageRated voltage Water load act 1000 g Initial temperature T1 10 1 C Heating time ii 47 sec Mass of container MC 330 g 2 Final Temperature AT T2 T1 P 90 x AT 0 55 x mc 2 0 47 Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start of the test 3 Temperature of the water The initial temperature of the water is 10 2 C 4 Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5 C 5 Select stirring devices and measuring instruments in order to minimize addition or removal of heat 6 The graduat
12. 5 E suma ZHOS A OEZ l 8 5 8 6 ZHOS A OEZ TTI 500000 ZEND W Figure O 4 Oven Schematic Convection Condition 14 3 R939 W NOTE indicates components with potentials above 250V SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 5 CONVECTION TEMPERATURE SELECTED 4 MICROWAVE POWER LEVEL SET 6 STRAT BUTTON PRESSED 2 DUAL1 MODE SET 3 COOKING TIME SET NOS L3NOVW ON NOULINOVIN DIN AH C x AH N00LZOW snop HOLIOVJVI 9 ASYMMETRIC RECTIFIER ASYMMETRIC RECTIFIER YUINYOAISNVEL L x YINYOASSNVUEL FOVLIOA L 9 2 AN3N373 NOLL93ANO9 HO E 1N3IN3T3 ONILV3H NOLLO3ANOO HO 9 YOLOW 3TEVANYNL Sa 9 YOLON FIEVINSNL OE OT gt OT EO 8 Ze 8 55 25 o 20 o 7 o 9 o z 5 z 2 2 0 4 5 0 4 I 86 3 5 5
13. CARRY OUT 4R CHECKS SWITCH UNIT R939 W 15 Procedure O RELAY TEST CARRY OUT 3D CHECKS Remove the outer case and check voltage between Pin Nos 1 and 3 of the 4 pin connector E on the control unit with an A C voltmeter The meter should indicate 230 volts if not check oven circuit Relay Test Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation grill operation convection operation or dual operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 18 0V D C Oven lamp Turntable motor RY2 18 0V D C High voltage transformer RY3 24 0V D C Grill Top heating element RY4 24 0V D C Convection heating element RY5 APPROX 24 0V D C Fan motor RY6 24 0V D C Touch control transformer RY7 24 0V D C Convection motor RY8 24 0V D C Damper motor CARRY OUT CHECKS 16 Procedure P PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protect the electronic circuits this model is provided with a fine foil pattern added to the inp
14. HOIH 1 R FOVLIOA L Y SIN3N313 TMO H SIN3W313 TIRO HO TRUM ULL 2 ONLLV3H NOLLOSANOO HO g 1N3 4373 ONLLV3H NOLLO3ANO9 HO 3 GET 379VINUNI YOLON OT 05 ES ED o ZE 3 zt HOLON NYJ 9 gt 20 20 uolowNouoaANoo dv 2 E E HOLON o 9 FA ca 2 wa n y V pr 2 O 2 4 I 4 55 b GE 9 OE T 2 T 5 5 5 s 5 2 soll 3 ag a NOE os 205 ES 553 n 5 n 5 8 E 8 Ez al 9 35 3 55 252 a x n 8 5 8 5 7 o 1no lno 2 2 1no dno 2 IVAY3HL 5 6 8 o TVNS3HL gt 5 ANOO ui o ANOD EOL m 9 ea 23 YINYOASNVUL O L e Q 5 LNO 1N9 INO LN9 100 100 TYNYSHL JIVNYIHL D OWN OL Tiso 201 iL OVN ol _ THYD 201 asna za 85 4 24 AOSZ 40027 AOSZ 4004 ul sna A0sz 19002 062 4004 LS MS 0 089 MS 0 M 089 gt T P ual 1102 NOISS3YAANS 3SION E 4 0 Ha TOI NOISE SION 3SION o tx 3SION O o i uu FEO MS 0 NOL 5 o 6 2 a MS O MOL 22542 2 3SNH L4 eco o uZzsz O voz JSN thd 220 _ HINV3 2 9 E 2 Hlava 2 ZAN SUAS IVULNIN 5 3 9 Q am ZAN SL A D WHLNSN SUNYA 5
15. IN3 W373 ONILVIH NOLLOJANOD HO E HOLON Pa 3 YOLOW 318VINSN L x 2 Or EO 5 e 65 8 amp 5 5 5 35 AOL SOLON NS 35 3 mo OLON 23 N NOLLOSANOO 8 HOLO NOLLOSANOO 8 YOLON J gt YOLOW na 2 wa 2 ia zv y Nor P E 2 2 a ae Pio ghi Oo 0 VO Vi 2 5 Tote PePe lelzre E E x xlz I E 2 9 o P be u E 514 X 5 gt 5 a c a NAE a g 5 One 303 OV gt ADB x 2 a za 5 gt 5 9 O 5 SU Se Lgs 2 gs 2 Me SLE e ste 2 555 35 5 OG 5 3 5 5 e 5 PQ_S E E E 1nono Orns Ze 19 2 INO INO IVNYAHL ilg gt amp 5 a o5 a E a c ANOD 2 ANOD ui EOL EOL E wl 3 ev 5 d wi 3 23 93 a 13 YINYOISNVUL O L YAWYOASNVYL 9 1 3E Z pr 5 100 110 LNO 1N9 IO HT TWWYSHL 9 JYNYIHL 0 TJYNYIHL TVWH3HL OVN LOL E Tuo zo 0 E OVN VOL TINO 201 FT ves R gt ul f Lysa 3SNI 24 AOSZ 80027 AOSZ d004t ic lO a ASN 24 MOSZ 100 52 400 i M amp 0 P 089 E 2 SC i M amp 0 PA 089 1102 NOISS3YAANS 3SION iu 1102 NOISS3YAANS 3SION 3SION 16 9 3SION 1 lt 1 MSO
16. RTRN A529WRE1 AW TC transformer 1 5 FH HZA075WREO AS Thermistor CABINET PARTS 2 1 GCABDAOO5URP1 BC Back plate 2 2 GCABUBOS1WRPZ BM Outer case cabinet R 939 W 2 2 GCABUBO52WRPZ BN Outer case cabinet R 939 BK R 939 IN 2 3 GLEGPAO57WRE2 AF Foot 2 4 A003URP3 BA Base plate OVEN PARTS 4 1 PCUSUA312WRPO AC Cushion 4 2 PCUSUA050UREO AB Cushion 4 3 LANGFA002URPO AL Cavity support angle 4 4 DOVN A024URK0 BU Oven cavity 4 5 MCAMPAOO1URF 1 AF Damper cam 4 6 LANGTA009URP2 AG Damper angle 4 7 FFTA A001URK0 AM Damper assembly 4 9 PDUC A011URF1 AQ Air intake duct 4 10 PDUC A014URPO AH Exhaust duct 4 11 PSKR A010URPO AF Partition plate B 4 12 PDUC A012URPO AL Air duct 4 13 LANGQA017URPO AF Grill heater angle 4 14 OTANNAOO1URPO Earth plate 4 15 PREFHAOO1URPO AS Grill reflector 4 16 LANG A054WRP 1 AK Convection heater angle 4 17 LANGQA308WRP 1 AK Convection motor angle 4 18 NFANMA003URPO AF Cooling fan 4 19 PDUC A042URPO AG Convection duct 4 20 PPiPFA005UR10 AK Pipe 4 21 PSKR A013URPO AG Air separate angle A 4 22 PSKR A014URPO AF Air separate angle B 4 23 PSKR A015URPO AF Air separate angle C 4 24 PSKR A016URPO AF Air separate angle D 4 25 PSLDHA005URPO AQ Rear heat cover 4 26 LANGQAO 1 8URP 1 AM Convection heater angle A 4 27 PFPF AOO2URE1 AL Heat insulating material 4 28 PSKR A012URPO AG Air separate angle E 4 29 PSKR A308WRF 1 AL Rear barrier 4 30 NFANMAOO4UR
17. 10 Secondary winding Approx 1230 Primary winding Approx 1 90 WARNING DISCONNECT THE PLUG WHEN MEASURING RESISTANCE 13 1 R939 W NOULINOVIN x NOSLINDVN OW NH 931311938 AH indicates components with potentials above 250V SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 3 NOTHING APPEARS ON DIS PLAY 2 PLUGGED IN OVEN CHAPTER 14 CIRCUIT DIAGRAMS 1 Oven Schematic R939 W E gt E um MESS x x o AO0LZOV Hu AO0LZOV G ANOLE 91 LEI zb 4 9 25 Lu zu zu H3IAHOJSNVHL i E YINYOISNVYL i E 1 1 SIN3W3T3 ONLLV3H THD HO TIYO HO UU TL UL TU UL UUL iieo 1N3IN3T3 NOLLOSANOO HO 9
18. 300 NOWWOO NOILIGNOO ONIMOOI TNA NOILIGNOD 2NMOO9 TUD NOILO3ANOO SNPOOD JAVMOSDIN aaon ODNIMO09 330 R939 W CHAPTER 8 TEST PROCEDURES 1 Procedure A MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals the meter should show a reading of less than 1 ohm To test for a short circuit filament to anode condition connect ohmmeter between one of the filament terminals and the case of the magnetron ground This test should be indicated an infinite resistance If a low or zero resistance reading is obtained then the magnetron should be replaced MICROWAVE OUTPUT POWER IEC60705 The following test procedure should be carried out with the microwave oven in a fully assembled condition outer case fitted Microwave output power from the magnetron can be measured by IEC test procedure i e it can be measured by using water load how much it can be absorbed by the water load To measure the microwave output power in the microwave oven the relation of calorie and watt is used When P W heating works for t sec
19. 8 POWER OUTPUT REDUCTION After the same cooking mode is carried out for more than the basis cooking time the power output is automatically reduced by turning the control relays on and off intermittently as shown in the table below This is to protect the oven door against temperature rising Cooking mode Basis cooking Reduced power Time base time minutes output seconds Microwave 100 20 70 32 Grill 15 70 48 Convection No reduction Micro 70 40 Micro 50 48 D Grill 15 Grill 50 48 U Micro 100 15 Micro 50 48 A Grill 15 Grill 50 48 L Micro 70 40 Micro 50 48 Conv No reduction NOTE 1 If the multiple sequence cooking is carried out in the same mode the basis cooking time is calculated from the first 2 Even if the cooking is stopped by the STOP key or opening the door the basis cooking time is calculated from the first 3 If the same cooking mode is repeated within 1 minute and 15 seconds the basis cooking time is calculated from the first 4 If the same menu of Automatic Cooking is repeated within 1 minute and 15 seconds the power output of the micro wave or the grill will be reduced to 70 after 20 minutes when the started at first 9 FAN MOTOR OPERATION in Grill Convection and Dual mode When oven is stopped during cooking or after the cooking is com pleted the fan motor will operate if the o
20. Man b r ikke uds tte sig for mikrob lgebestr ling fra magnetronen eller andre mikrob lgefrembringende anordninger hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges forkert Alle mikrob lgeindgange og udgange b lgeledere flanger og t tningsstrimler m v re forsvarligt udf rt Anvend aldrig ovnen uden en mikrob lgesabsorberende anordning Se aldrig ind i en ben b lgeleder eller antenne mens ovnen er i brug R939 W CHAPTER 2 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current contact with following parts will result in electrocution High voltage capacitor High voltage transformer Magnetron High voltage rectifier assembly High voltage harness REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1 Disconnect the supply 2 Door opened and wedged open 3 Discharge high voltage capacitor WARNING AGAINST THE CHARGE OF THE HIGH VOLTAGE CAPACITOR The high voltage capacitor remains charged about 60 econds after the oven has been switched off Wait for 60 seconds and then short circuit the connection ofthe high voltage capacitor that is of the connectin glead of the high voltage rectifier against the chas siswith the use of an insulated screwdriver Sharp recommend that wherever possible fault findingis carried out with the supply disconnected It may in some Cases be necessary to connect the supply after the out er case
21. TYNSIHL TIMO COL AOSZ 400 AOSZ 190024 MS 0 hl 089 VALI 3SION 1102 NOISS3YddNS 3SION NOL AOSZ N 22 0 3SN3 lA HLUVI ZAN SUA vann SNYE Sina ZHOS A 02 Figure O 2 Oven Schematic Microwave cooking Condition 14 2 indicates components with potentials above 250V SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 4 STRAT BUTTON PRESSED 2 GRILL MODE SET 3 COOKING TIME SET R939 W NOULINOVIN DIN NOULINOVIN DIN YaldlLO38 AH YIIHLLOIY AH c IN i ur gt T NE 2 ok mm E wiz En A00LZOV Anobii zu angy zu E 4 voLovavo L I 25 0 1 2c Ru LJ N YINYOISNVEL i IN H3AHOJSNVHL i
22. o O N a O i Stator ics M Stator 1 Gap Bracket Rotor Rotor Rear View Side View 8 TURNTABLE MOTOR REPLACEMENT REMOVAL Disconnect the oven from the power supply Remove the turntable roller stay from the oven cavity Turn the oven over gt PAN Cut the three 3 bridges holding the turntable motor cover to the base plate with cutting pliers as shown in Figure C 1 a CAUTION DO NOT DROP THE TURNTABLE MOTOR COVER INTO THE OVEN AFTER CUTTING THE BRIDGES BECAUSE IT WILL DAMAGE THE WIRE LEADS OF THE MOTOR AND IT IS DIFFICULT TO REMOVE IT OUT OF THE OVEN 5 Remove the turntable motor cover from the base plate Disconnect the wire leads from the turntable motor 7 Remove the two 2 screws holding the turntable motor to the oven cavity back plate Remove the turntable motor from the turntable motor angle Now the turntable motor is free REINSTALL Remove the any sharp edges on the turntable motor cover and the base plate with the cutting pliers Re install turntable motor by locating shaft onto coupling to the oven cavity base plate with the two 2 screws the wire leads to the turntable motor R939 W Make sure that the fan blade rotates smoothly after installation Make sure that the axis of the shaft is not slanted 3 Insert the tabs of the fan duct to the back plate 4 Install the fan duct to the back plate with the one 1 screw
23. r felanslutna eller anv nds fel s tt Alla in och utg ngsanslutningar f r mikrov gor vagledare fl nsar och packningar m ste vara fast anslutna Mikrov gsgeneratorn f r inte arbeta utan att absorberande belastning r ansluten Titta aldrig in i n ppen v gledare eller antenn n r mikrov gsgeneratorn r p kopplad eller laddad VAROITUS MIKROAALTOSATELY Kaytt j ei saa joutua alttiiksi mikroaaltoenergialle jota voi s teill magnetronista tai muusta mikroaaltoja kehitt v st laitteesta jos sit k ytet n tai jos se kytket n v rin Kaikkien mikroaaltoliit nt jen sy tt ett ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunnia ei koskaan saa k ytt ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettyn ADVARSEL MIKROB LGESTR LING Personell m ikke utsettes for mikrob lge energi som kan utst les fra magnetronen eller andre mikrob lge generende deler dersom apparatet feilbetjenes eller blir feiltikoplet Alle inn og ut tilkoplinger i forbindelse med mikrob lge str lingen b lgeledere flenser oc tetningsringer pakninger m festes ordentlig Aldri bruk apparatet med mindre en mikrob lge absorberende last er plassert i ovnsrommet Aldri se direkte inn i en pen b lgeleder eller antenne imens apparatet er str mf rende ADVARSEL MIKROB LGEBESTRALING
24. Board of Power Unit 14 10 R939 W R939 W MEMO 8 Printed Wiring of Board of Switch Unit n a e aT Figure S 7 Printed Wiring of Board of Switch Unit 14 11 R939 W SHARP PARTS LIST MICROWAVE OVEN WITH GRILL AND CONVECTION HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following information MODELS R 939 B K 1 MODEL NUMBER 3 PART NO R 939 IN 4 DESCRIPTION R 939 W Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250 CONTENTS 2 CONTROL PANEL AND DOOR 1 OVEN PARTS PARTS m INDEX PACKING AND ACCESSORIES PAD ASSEMBLY FPADBA640WRKZ PROTECTION SHEET A DOOR PROTECTION SHEET SPADPA025URE0 SPADPA178WREO LOW RACK QUICK START GUIDE TINS A703WRRZ CAUTION LABEL TCAUHAO24URRO HIGH RACK ROLLER STAY ASSEMBLY BOTTOM PAD ASSEMBLY FPADBA641WRKZ OPERATION MANUAL WITH COOKBOOK MENU LABEL SQUARE TRAY for only R 939 BK PSRA A001URHO SQUARE RACK for only R 939 BK FAMI A003URK1 INTO e TURNTABLE TRAY OVEN CAVITY ty ACCESSORY HOLDER SPADPAO19UREO PACKING CASE SPAKCE407WRRZ R 939 W SPAKCE416WRRZ R 939 IN Not Replaceable Items SPAKCE417WRRZ R 939 BK This document has been published to be used SHARP CORPORATION for after sales service on
25. GND 3 2 5 e ON e 5 3 NEL LE 0 8 He Q 5ma b 4 le 3 5432 7 a STE 3 R4 510 1w o WH1 6 1 Q1 2581238 R5 3 3k 9 BUZZER AC230V A3 Sai R3 680 1w ssi 50Hz di LN 9 amp RY5 SP1 3 E 2 oz lt T 2 2 i 88 A a i AO A5 VR RY6 WHTS INT Ft A 111 POWER vg NHL CONTROL FAN MOTOR Le WHT 8 RY7 ce CONVECTION 9 r5 MOTOR D 1 WH1 7 RY8 WEE DAMPER D3 WH2 4 NC D5 OVEN LAMP RY1 R6 130 1w TURNTABLE MOTOR A Le CONVECTION RY4 HEATING WH1 12 ELEMENT AZ GRILL RY3 HEATING 1 WH1 13 ELEMENT AS T4 RY2 HIGH VOLTAGE TRANSFORMER 5 I Ta WH1 14 J Q A E i WH1 15 Q2 NI 3 6 B4 25 1238 r pi DAMPER e 5 SWITCH b H3 y 3 DAMPER TAS SWITCH NI STOP amp LB T Nc SWITCH x B1 WH1 1 STOP SWITCH NOTE 1 NOTE 2 w IF NOT SPECIFIED 1 4W 5 WH1 n 15 WIRE HARNESS IF NOT SPECIFIED 0 1 F 50V rs aE WIRE HARNESS DL IF NOT SPECIFIED 1SS270A Figure S 2 Power Unit Circuit 14 6 ASz 3N 100 091412345 LON dl 1 59656 131519395 LON dl AT SF MOL L 031519395 LON dl MW LON x ES y VIOOPZIV vol as Q hos zv 3 51 LOI 7 9 5
26. Magnetronovens mogen niet leeg aangezet worden Om te controleren of er microgolf energie binnen de oven wordt geproduceerd plaatst u een mok met koud water op de draaitafel van de oven sluit de deur zet de oven op HIGH en stelt de klok van de magnetron in op twee 2 minuten Wanneer de twee minuten voorbij zijn klok staat op nul controleert u voorzichtig of het water heet is Indien het water nog steeds koud is herhaalt u de allereerste drie stappen en controleer nogmaals de aansluitingen naar de geteste onderdelen Wanneer alle reparaties zijn uitgevoerd en de oven weer in elkaar is gezet moet de het magnetronvermogen worden gecontroleerd en moet worden gecontroleerd of er geen microgolflekkage is R939 W Los hornos de microondas contienen circuitos el ctricos capaces de producir voltajes de alta tensi n y descargas el ctricas Para evitar el riesgo de electrocuci n abst ngase de tocar los siguientes componentes condensador de alta tensi n transformador de alta tensi n magnetr n dispositivo del rectificador de alta tensi n y arn s de alta tensi n RECUERDE LA COMPROBACION 3D 1 Desconecte la alimentaci n 2 Deje la puerta abierta y calzada 3 Descargue el condensador de alto voltaje ADVERTENCIA SOBRE LA CARGA DEL CONDENSADOR DE ALTO VOLTAJE El condensador de alto voltaje permanece cargado unos 60 segundos despu s de haber apagado el horno Espere 60 segundos y luego ponga en cortoc
27. clean and replace bits more often when using lead free solder To reduce bit wear care should be taken to clean the bit thoroughly after each use 10 1 R939 W CHAPTER 11 COMPONENT REPLACEMENT AND ADJUSTMENT DURE 1 BEFORE OPERATING WARNING AGAINST HIGH VOLTAGE Microwave ovens contain circuitry capable of producing very high voltage and current contact with following parts may result in severe possibly fatal electric shock Example High Voltage Capacitor High Voltage Transformer Magnetron High Voltage Rectifier Assembly High Voltage fuse High Voltage Harness etc WARNING Avoid possible exposure to microwave energy Please follow the instructions below before operating the oven 1 Disconnect the power supply cord 2 Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and trans mission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven
28. input and output ter minals For this reason it is easily influenced by the surrounding high voltage power source static electricity charge in clothes etc and sometimes it is not fully protected by the built in protection circuit In order to protect CMOS LSI 1 When storing and transporting thoroughly wrap them in aluminium foil Also wrap PW boards containing them in aluminium foil 2 When soldering ground the technician as shown in the figure and use grounded soldering iron and work table approx 1M ohm VC 5 2V LSI IC1 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to com pose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency ACL A circuit to generate a signal which resets the LSI to the initial state when power is supplied Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds key touch sound and completion sound 9 Door Sensing Switch Stop Switch A switch to tell the LSI if the door is open or closed c Relay Circuit To drive the magnetron grill heating element convection heating element convection motor fan motor turntable motor damper motor touch control transformer and light the oven lamp Back Light Circuit A circuit to drive the back light Light emitting diodes LD10 LD19 Indicator Circuit 02
29. latch switch and the stop switch IMPORTANT When the oven door is closed the contacts COM NC of the moni tor switch must be open When the microwave oven is plugged in a wall outlet 230V 50Hz the line voltage is supplied to the noise filter Figure O 1 on page 14 1 1 The control unit is not energized The display shows nothing Fig O 1 a 2 Open the door The contacts COM NC of the monitored latch switch are closed and the control unit is energized Then contacts of relays RY1 are closed and the oven lamp will light and the display will show SELECT LANGUAGE in 5 languages Fig O 1 b NOTE NOTE Once the language is selected using the LANGUAGE key the display will show ENERGY SAVE MODE TO GO OUT OF ENERGY SAVE MODE SET CLOCK when the oven is plugged in 3 Close the door The contacts COM NC of the monitored latch switch are opened and the contacts of relay RY1 are opened and the oven lamp will be turned off The display will show 0 Fig O 1 c NOTE Energy save mode 1 If the oven has not been used for more than 3 minutes the contacts of the relay RY5 will be opened and the control unit will be not energized Open and close the door the control unit will resume 2 If the clock is set this energy save mode does not work 3 If the display shows different messages from ENERGY SAVE MODE the oven may be set in demo mode Close the door see operation manual to cancel de
30. obtained replace the thermal cut out An open circuit thermal cut out MG TC1 indicates that the magnetron has overheated this may be due to resistricted ventilation cooling fan failure An open circuit thermal cut out GRILL TC2 indicates that the oven cavity has overheated this may be due to no load operation An open circuit thermal cut out CONV TC3 indicates that the convection fan winding has overheated this may be due to resistricted ventilation or locked cooling fan or locked convection fan motor CARRY OUT CHECKS 8 Procedure H MOTOR WINDING TEST CARRY OUT 3D CHECKS Disconnect the leads from the motor Using an ohmmeter check the resistance between the two terminals as described in the table below Table Resistance of Motor Motors Resistance Fan motor Approximately 398 9 Q Turntable motor Approximately 14 7 kQ Convection fan motor Approximately 183 7 kQ Dumper motor Approximately 14 7 kQ If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS R939 W 9 Procedure I NOISE FILTER TEST CARRY OUT 3D CHECKS F1 Lo Disconnect the leads from the terminals of the noise filter Using an ohmmeter check 20 L between the terminals as described in the following table Cx T m MEASURING POINT INDICATION OF OHMMETER L Between N and L Approx 680 No 22 C o RED Between t
31. oven lamp from its retaining clips by pushing the tab of the air intake duct 4 Now the oven lamp is free 12 POWER SUPPLY CORD REPLACEMENT 1 REMOVAL 11 4 Terminal Positive lock connector Lever Figure C 3 Oven lamp 1 CARRY OUT 3D CHECKS Remove the 1 screw holding the green yellow wire to the back plate Disconnect the leads of the power supply cord from the noise filter referring to the Figure C 4 a Release the power supply cord from the rear cabinet 5 Now the power supply cord is free Power supply cord Back plate Green Yellow wire Brown wire Figure C 4 a Replacement of Power Supply Cord 13 GRILL HEATING ELEMENTS REMOVAL 1 2 3 CARRY OUT 3D CHECKS Disconnect wire leads from the thermal cut out GRILL Remove the two 2 screws holding the two 2 terminals of the main wire harness to the two 2 grill heating elements Remove the one 1 screw holding the exhaust duct to the oven cavity top plate 5 Remove the exhaust duct from the oven cavity top plate By pushing the two 2 tabs holding the grill reflector to the oven cavity top plate slide the grill reflector toward the magnetron And then lift up the grill reflector and remove it R939 W REINSTALL Insert the moulding cord stopper of power supply cord into the square hole of the power angle referring to the Figure C 4 b Install the earth wire lead of power
32. performing the checks Many of the possible causes of trouble will require that a specific test be performed These tests are given a procedure letter which will be found in the Test Procedure section IMPORTANT If the oven becomes inoperative because of a blown fuse F2 F8A the monitored latch switch SW1 monitor switch SW3 circuit check the moni tored latch switch SW1 and monitor switch SW3 before replacing the noise filter fuse F2 F8A R939 W 2 CHART Jeey jou seop Buneeu IS JESU JOU op s ueweje Duneeu UONDSAUO euo 95 uey Jeuiu JO Jamo SI UI ay INQ aq pedoud aq 0 wees jou seop peo UI peonpoud si ou Jo mq Bunesado aq ejoKo jo pue sinus 2 2 3009 USAO ejeJedo jou seop Jueweje Buneeu UD euo jesaJd uey JO SI ueno y ui aunjejadua y INQ Bunejedo aq ueAQ Jeay jou seop Buryooo jo pue eJojeq sinus INQ 1009 qui ueAQ Uonipuoo Bunyoo9 00 1daoxa uonipuoo ajqenea Buunp aq jou seop OOL 18 195 SI eo
33. que el agua se ha calentado Si el agua permaneciese fr a efect e las comprobaciones 3D y vuelva a examinar las conexiones de los componentes que han sido probados Cuando haya terminado la intervenci n en el equipo y el horno haya sido ensamblado de nuevo completamente deber comprobar la potencia de salida de microondas y realizar unaprueba de fugas de microondas Mikrov gsugnar inneh ller kretsar som producerar mycket h ga sp nningar och str mmar Kontakt med f ljande komponenter kan leda till d dsfall H gsp nningskondensator transformator magnetron h gsp nnings likriktare h gsp nnings kablage KONTROLLERA 3 STEG 1 Koppla fr n str mk llan 2 ppna d rren gl nt 3 Ladda ur h gsp nningskondensatorn VARNING F R LADDNINGEN H GSP NNINGSKONDENSATORN H gsp nningskondensatorn r laddad 60 sekunder efter det att ugnen st ngts av V nta 60 sekunder och korislut sedan kondensatoms anslutning dvs anslutningen h gsp nningslikriktaren till chassiet med hj lp av en isolerad skruvmejsel Sharp rekommenderar att fels kning sker med str mmen fr nkopplad kan det var n dv ndigt att koppla str mmen efter det att h ljet avl gsnats utf r da 3 Steg kontrollen och koppla sedan fr n ledarna till transformatorns prim rsida Se till att ledarna r isolerade fr n andra komponenter och chassiet Anv nd isoleringsband om det
34. supply cord to the back plate with one 1 screw and tight the screw Connect the brown and blue wire leads of power supply cord to the noise filter correctly referring to the Pictorial Diagram Power supply cord Moulding cord stopper Back plate Square hole Figure C 4 b Power Supply Cord Replacement Remove the one 1 screw holding the grill heater angle to the grill heater reflector Straighten the two 2 tabs of the grill heater angle and remove the grill heater angle from the grill reflector Remove the two 2 screws holding the earth plate to the two 2 grill heating elements 10 Remove the two 2 grill heating elements from the grill reflector 11 Now the grill heating elements are free 14 MONITORED LATCH SWITCH MONITOR SWITCH AND STOP SWITCH REMOVAL 1 CARRY OUT 3D CHECKS Remove the control panel assembly referring to CONTROL PANEL ASSEMBLY REMOVAL 3 Disconnect the leads from all switches Remove the two 2 screws holding the latch hook to the oven cav ity 5 Remove the latch hook Remove the switch es from the latch hook by pushing the retaining tab backwards slightly and turning the switch es on the post Now the switch es free SW2 Stop switch SW3 Monitor switch SW1 Monitored latch switch Figure C 5 Switches 15 MONITORED LATCH SWITCH STOP SWITCH AND MONITOR SWITCH ADJU
35. the base plate Remove the one 1 screw holding the chassis support to the back plate Remove the one 1 screw holding the back plate to the air intake duct 11 3 R939 W 9 Remove the two 2 screws holding the back plate to the convec tion duct 10 Remove the back plate from the oven cavity 11 Disconnect the wire leads from the convection heating elements convection motor and thermal cut out 12 Remove the one 1 screw holding the convection duct to the oven cavity back plate from outside of the oven cavity 13 Remove the seven 7 screws holding the convection duct to the oven cavity back plate from inside of the oven cavity 14 Lift up the convection duct and release the three 3 tabs of the oven cavity back plate from the convection duct 15 Now the convection unit assembly is free 2 CONVECTION HEATING ELEMENT REMOVAL 1 Remove the convection unit assembly refer to the UNIT ASSEMBLY REMOVAL 2 Remove the two 2 screws holding the convection heating element to the convection duct 3 Remove the one 1 screw holding the convection heater angle to the convection duct 4 Remove the one 1 screw holding the convection heater angle and the air separate angle D to the convection duct 5 Remove the one 1 screw holding the convection heater angle A to the convection duct Remove the convection heating element from the convection duct Now the convection
36. the electrical parts When the cut out cools itself down to the operating temperature of 155 C the contacts of the thermal cut out will close again 10 THERMAL CUT OUT CONV This thermal cut out protects the convection motor against overheat ing If the temperature of the thermal cut out TC3 rises above 170 C because the convection fan is interrupted the ventilation openings are obstructed or the other abnormal matter occurs the thermal cut out opens and switches off the convection heating element and the other electrical parts When the cut out cools itself down to the operating temperature of 155 C the contacts of the thermal cut out will close again TC3 170 11 ASYMMETRIC RECTIFIER The asymmetric rectifier is solid state device that prevents current flow in both directions And it prevents the temperature rise of the high volt age transformer by blowing the fuse F2 F8A when the high voltage rectifier is shorted ASYMMETRIC RECTIFIER HIGH VOLTAGE RECTIFIER R939 W the rectifier is 1 7 01 and 02 of the recti fier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage The pro cess of the blowing the fuse 2 F8A 1 The high voltage rectifier is shorted by some fault when microwave cooking or dual cooking The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltag
37. 2 AM JHNDPA263WRFZ 2 5 1 9 AN 1 JHNDPA264WREZ 2 5 1 4 BA RTRN A016URE2 1 BL JKNBKA766WRFZ 2 3 10 AG RTRN A529WRE1 TETEA AW JKNBKA767WRFZ 2 3 11 AG RV MZA264WRE1 1 MG BG JKNBKA769WRTZ 2 3 10 AG T 1 JKNBKA770WRTZ 2 3 11 AG TCADCA896WRRZ 2 6 7 AP 1 TCAUHA024URRO 2 6 11 AE LANG A054WRP1 1 4 16 AK TiNS A703WRRZ 2 6 12 AM LANGFA001URP1 1 4 35 AL TLABMB127WRRZ 2 6 6 AL LANGFA002URPO 1 4 3 X 1 LANGQA017URPO 1 4 13 XBPWW30P05K00 1 7 12 AA LANGQAO18URP1 1 4 26 5740 44 50 2 5 1 11 LANGQA308WRP 1 1 4 17 XCBWW30P06000 1 7 3 AA LANGTA009URP2 1 4 6 5730 06000 2 5 1 8 LBNDKA111WRP1 1 4 48 AG XEPS730P10X00 2 3 13 AA LHLDKA008WRF1 1 6 10 AF XEPS740P25000 1 7 7 LSTPPAO17URFO 2 5 1 5 5730 06000 1 7 8 LSTPPAO18URFO 2 5 2 BB XHPS740P06000 1 7 10 LX CZA001UREO 1 7 16 5740 08 00 1 7 1 LX EZA042WREO 1 7 2 AB XHTS740P08RVO 1 7 15 M 1 XHTWW40P08000 1 7 13 AC MCAMPA001URF 1 1 4 5 AF XJBS730P16000 1 7 14 MSPR A006WREZ 2 8 12 AF XJPS740P10X00 1 7 9 AB MSPRTA197WREZ 2 5 1 6 AF XNEUW40 32000 1 7 4 AA CN XOTS740P10000 1 7 17 NCPL A040WRE2 1 4 36 AL XOTWW40P10000 1 7 11 AA NFANJA038WREO 1 4 33 AG XRES740 06000 1 7 5 NFANMA003URPO 1 4 18 XWSUW40 10000 1 7 6 NFANMA004URPO 1 4 30 AG
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39. 5 Re install the chassis support to the oven cavity with the four 4 screws Install the noise filter to the fan duct and the chassis support with the one 1 screw Re connect the wire leads to the fan motor Shaft These are the positions that should be pinched with pliers Table 7277 Center of bracket 4 Insert the 1 tab of the turntable motor cover into the slit of the base plate as shown in Figure C 1 b 5 Re install the turntable motor cover to the base plate with the screw XHPS740P08K00 as shown in Figure C 1 b Cutting pliers Base plate Bridges Turntable motor cover zd Figure C 1 a Turntable Motor Cover Replacement Turntable Screw XHPS740P08K00 Base plate Figure C 1 b Turntable Motor Cover reinstall 9 CONVECTION MOTOR AND CONVECTION HEATING ELEMENT REMOVAL CONVECTION UNIT ASSEMBLY REMOVAL CARRY OUT 3D CHECKS Now the outer case cabinet and the air duct should have been removed Remove the one 1 screw holding the earth wire of the power sup ply cord to the back plate Release the power supply cord from the back plate 4 Remove the two 2 screws holding the rear barrier to the base plate 5 Release the three 3 tabs of rear barrier from the base plate And remove the rear barrier 6 Remove the one 1 screw holding the back plate to
40. 8 wo a gt SOLON YIANYA q ma z wa ia uv d oe 2 o 8 Pate 2 a 3 K 2 2 o Omg gl 5 an 3 E Q p 1 g 1N0 1ND 2 TVWHSHL ANOO Ya calle a HINHOISNYYL 2 1 3E 1noino 100 1102 IVINYIHI OVW OL TINO oL ma ASN cJ AOSZ 400 MOSZ 4002 MG 0 Pl 089 OFF Condition after the oven door is closed c Oven Schematic 1 Figure O SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 MICROWAVE MODE SET 3 COOKING TIME SET 4 STRAT BUTTON PRESSED NOH L3NOVMW DIN Y31311938 AH A00LZOW YOLIDVAVI D RECTIFIER YINYOJSNVIL HOIH 4 SIN3 N3713 ONILVIH or E SEE c lt a ca 4 al a 5 1no ino zc 19 2 IVAYIHI Er I 65 9 EOL ONILV3H NOLLO3ANOO HO 2 MOLON ITEVANYNL oF OF 2 8 35 YOLON NVH 23 8 2 WO NI A HOLON 52 NI 2 SW1 LATCH SWITCH Lv 63 3 YINYOSSNVUL 2 1 3E 1N0 1N9 TYNYIHL OVW LOL 110 119
41. CIENT 8 1 R939 W 10009 Fi 1000g 10004 KID TT jn fi gt FE T1 C T2 C Heat up for 50 sec 2 Procedure B HIGH VOLTAGE TRANSFORMER TEST WARNING High voltages and large currents are present at the secondary winding and filament winding of the power transformer It is very dangerous to work near this part when the oven is on NEVER make any voltage measurements of the high voltage cir cuits including the magnetron filament 1 CARRY OUT 3D CHECKS 2 Disconnect the leads to the primary winding of the high voltage transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three winding The following readings should be obtained a Primary winding approximately 1 9 Q b Secondary winding approximately 123 Q c Filament winding less than 1 Q If the readings obtained not stated as above then the high voltage transformer is probably faulty and should be replaced 3 Also the high voltage transformer has the thermal cut out in the primary coil The thermal cut out will open when the temperature of the thermal cut out in the primary coil reaches approximately 150 C The thermal cut out resets automatically at 130 C If an ohmmeter indicates an open cir cuit under normal condition replace the high
42. COOKING CONDITION 5 1 3 GRILL COOKING CONDITION 5 2 4 CONVECTION COOKING CONDITION 5 2 5 DUAL COOKING CONDITION 5 2 6 ON OFF TIME 5 3 7 AUTOMATIC COOKING 5 3 B POWER OUTPUT REDUCTION 5 3 9 FAN MOTOR OPERATION 5 3 10 CONVECTION MOTOR 5 3 CHAPTER 6 FUNCTION OF IMPORTANT COM PONENTS 1 DOOR OPEN MECHANISM 6 1 2 MONITORED LATCH SWITCH SW1 6 1 3 STOP SWITCH 5 2 6 1 4 MONITOR SWITCH 5 3 6 1 5 FUSE F1 20A 250 6 1 6 FUSE F2 250V NOISE FILTER 6 1 7 TC TRANSFORMER 6 1 8 THERMAL CUT OUT TC1 125C MG 6 1 9 THERMAL CUT OUT TC2 170C ie 6 1 10 THERMAL CUT OUT TC3 170 cn ai 6 1 11 ASYMMETRIC RECTIFIER 6 1 12 NOISE FILTER nnen 6 2 13 TURNTABLE MOTOR TTM 6 2 14 FAN MOTOR 6 2 15 CONVECTION MOTOR CM 6 2 16 GRILL HEATING ELEMENT GH 6 2 17 CONVECTION HEATING ELEMENT lo EEE 6 2 18 CONVECTION COOKING SYSTEM 6 2 19 FIRE SENSING FEATURE 6 2 20 OPEN J
43. DE VOLGENDE 3 STAPPEN NIET 1 Haal de stekker het stopcontact 2 Open de deur en zorg ervoor dat hij niet dicht kan vallen 3 Ontlaad de hoogspanningscondensator PAS OP VOOR DE ELECTRISCHE LADING VAN DE HOOGSPANNINGSCONDENSATOR De hoogspanningscondensator blijft nog ongeveer 60 seconden lang opgeladen nadat de oven is uitgeschakeld Wacht 60 seconden voordat u de verbinding van de hoogspannings condensator m a w de verbindingsdraad van de hoogspanningsgelijkrichter met een ge soleerde schroevedraaier kortsluit tegen het chassis Sharp beveelt ten sterkste aan dat voor zover mogelijk defecten worden opgespoord wanneer de stekker uit het stopcontact is gehaald Soms is het nodig om de stroomtoevoer weer tot stand te brengen nadat de buitenmantel verwijderd is Herhaal dan de bovengenoemde 3 stappen en haal deelectrische draden uit de primaire zijde van de vermogenstransformator Zorg ervoor dat deze draden ge soleerd blijven van andere elementen en van het chassis van de oven Gebruik zo nodig isolatieband Wanneer de test is uitgevoerd herhaalt u de bovenstaande 3 stappen en verbindt u de electrische draden weer aan de primaire zijde van de vermogenstransformator VERGEET DE VOLGENDE 4 STAPPEN NIET 1 Sluit de draden weer aan diezijn losgehaald voor de test 2 Plaats de buitenmantel weer om het toestel heen kabinet 3 Stop de stekker weer in het stopcontact 4 Zet de oven aan Controleer alle functies
44. ENZIONE AL CONDENSATORE AD ALTA TENSIONE PUO ESSERE CARICO Il condensatore ad alta tensione rimane carico per circa 60 secondi dopo lo spegnimento del forno Occorre quindi spettare 60 secondi prima di cortocircuitare utilizzandoun cacciavite con impugnatura isolata il collegamento del condensatore ad alta tensione cio del conduttore di collegamento del raddrizzatore ad alta tensione sul telaio del forno Sharp raccomanda nei limiti del possibile che la ricerca dei guasti avvenga in assenza di alimentazione elettrica In alcuni casi tuttavia pu essere necessario alimentare l apparecchiodopo aver rimosso la scatola esterna In questo caso eseguire i tre controlli sopra citati e quindi scollegare i connettori dal primario del trasformatore Assicurarsi che tali connettori non vengano a contatto con altri componenti ne con il telaio del forno fare uso se necessario di nastro isolante AI termine dell intervento eseguire nuovamente i tre controlli e ricollegare i conduttori al primario del trasformatore QUATTRO VERIFICHE IMPORTANTI DA NON DIMENTICARE 1 Ricollegare tutti i conduttori staccati dai vari componenti durante l intervento 2 Rimontare la scatola esterna 3 Ripristinare l alimentazione elettrica 4 Rimettere in funzione il forno Controllare tutte le funzioni forni a microonde non devono mai funzionare a vuoto Per verificare la presenza di energia da microonde all interno di una cavit mette
45. ER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER 1 Employing lead free solder The Main PWB of this model employs lead free solder This is indicated by the LF symbol printed on the PWB and in the service manual The suffix letter indicates the alloy type of the solder Sn Ag Cu Indicates lead free solder of tin silver and copper Example 2 Using lead free wire solder When repairing a PWB with the LF symbol only lead free solder should be used Using normal tin lead alloy solder may result in cold soldered joints and damage to printed patterns As the melting point of lead free solder is approximately 40 C higher than tin lead alloy solder it is recommend that a dedicated bit is used and that the iron temperature is adjusted accordingly 3 Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosion of the bit To reduce wear on the bit reduce the temperature or turn off the iron when it is not required Leaving different types of solder on the bit will cause contamination of the different alloys which will alter their characteristics making good soldering more difficult It will be necessary to
46. If the wire harness or electrical components are shortcircuited this fuse F1 20A blows to prevent an electric shock of fire hazard 6 FUSE F2 F8A 250V NOISE FILTER 1 If the wire harness or electrical components are shortcircuited this fuse blows to prevent an electric shock or fire hazard The fuse also blows when the monitored latch switch SW1 remains closed with the oven door open and when the monitor switch SW3 contact COM NC closes The fuse also blows when the asymmetric rectifier H V rectifier H V wire harness H V capacitor magnetron or secondary winding of high voltage transformer is shorted 7 TC TRANSFORMER T C transformer converts A C line voltage into low voltage to drive the control unit 8 THERMAL CUT OUT TC1 125 MG This thermal cut out protects the magnetron against overheat If the temperature goes up higher than 125 C because the fan motor is interrupted or the ventilation openings are blocked the thermal cut out TC1 will open and switch off all the electrical parts The defective ther mal cut out must be replaced with a new one 9 THERMAL CUT OUT TC2 170C GRILL This thermal cut out protects the oven against the overheat during grill cooking convection cooking or dual cooking If the temperature rises above 170 C because the fan motor is interrupted the air inlet duct is blocked or the ventilation openings are obstructed the thermal cut out TC2 opens and switches off all
47. KA77OWRTZ AG Vari knob R 939 BK R 939 IN 3 12 MSPR A006WREZ AF Switch spring 3 13 XEPS730P10X00 AA Screw 3mm x 10mm DOOR PARTS 5 1 CDORFB049WRKZ BX Door panel assembly R 939 W 5 1 CDORFB051WRKZ Door panel assembly R 939 BK 5 1 CDORFA050WRKZ BV Door panel assembly R 939 IN 5 1 1 GCOVHA024URFO AT Choke cover 5 1 2 DDORFB260WRKZ BF Door panel 5 1 3 GWAKPBO45WRFZ AT Door frame R 939 W 5 1 3 GWAKPBO48WRFZ AT Door frame R 939 BK 5 1 3 GWAKPA046WRTZ BD Door frame R 939 IN 5 1 4 JHNDPA259WREZ AY Door handle R 939 W 5 1 4 JHNDPA264WREZ BA Door handle R 939 BK R 939 IN 5 1 5 LSTPPAO17URFO AK Latch head 5 1 6 MSPRTA197WREZ AF Latch spring 5 1 7 PGLSPA668WREZ AX Front door glass R 939 W 5 1 7 PGLSPA670WREZ BA Front door glass R 939 BK R 939 IN 5 1 8 XEBS730P06000 AC Screw 3mm x 6mm 5 1 9 JHNDPA260WRFZ AH Handle cover R 939 W 5 1 9 JHNDPA263WRFZ AN Handle cover R 939 BK R 939 IN 5 1 10 JHNDPA261WRFZ AG Handle base R 939 W 5 1 10 JHNDPA262WRFZ AR Handle base R 939 BK R 939 IN 5 1 11 5740 44 50 AC Screw 4mm x 44mm 5 2 LSTPPAO18URFO BB Door stopper MISCELLANEOUS 6 3 PSRA A025WRP 1 AY Baking tray 6 4 FAMi A001URK1 AT High rack 6 5 FAMi A002URK1 AT Low rack 6 6 TL ABMB127WRRZ AL Menu label 6 7 TCADCA896WRRZ AP Operation Manual with Cook book 6 8 FW VZA104URE2 BD Main harness 6 9 FW VZA074URE4 AN Stop switch harness 6 11 TCAUHAO24URR
48. MOL NS 3 MS 0 Wor ASN 14 22 0 5 3snd 14 22 0 s HLAVA Q HLAVA GLAD Ganan 5 3 3A SUA 9 I fvaman SUNY Ow m SLINTE ZHOS A OEZ TTI 8 ZHOS A OEZ kE ot ZN Figure O 1 b Oven Schematic OFF Condition when the oven door is opened 14 1 R939 W SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 0 APPEARS ON DISPLAY NOTE indicates components with potentials above 250V NOHLINDVN DIN x HaldlLO3H AH we gt N E x x Es 00120 FLA SF 2 x aur N YINYOASNVEL N Ly 77 SIN3W3T3 ONLLV3H THD HO tee N O 3SION VOZ SSNS 4 1102 NOISS3HddNS 3SION MS 0 NOL AOSCIn 220 aA GLAD TYHLNIN ZHOS A OEZ HLUVI IN3W373 ONILV3H YOLON ie 2 Wi 25 Va 5 ze 10 9 SOLON 52 SOLOW _ dv
49. O AE Caution label R 939 BK R 939 IN 6 12 TINS A703WRRZ AM Quick start guide 6 13 FAMi A003URK1 AW Square rack R 939 BK 6 14 PSRA A001URHO 2 Square tray R 939 BK R939 W BINDEX PARTS CODE No MAC PART PARTS CODE No Pe RANK C 1 NTNT A040WREO 1 6 2 AZ CDORFA050WRKZ 2 5 1 BV 1 CDORFBO49WRKZ 2 5 1 BX PCOVPA309WREO 1 4 37 CDORFBO51WRKZ 2 5 1 PCUSUA050UREO 1 4 2 AB D 1 PCUSUA312WRP0 1 4 1 DDORFB260WRKZ 2 5 1 2 PDUC A011URF1 1 4 9 AQ DOVN A024URK0 1 4 4 BU PDUC A012URPO 1 4 12 AL DPWB A406DRKZ 2 3 1 PDUC A014URPO 1 4 10 DPWB A411DRKZ 2 3 3 BC PDUC A016URF1 1 4 32 AQ DPWBFA226URKO 2 3 2 PDUC A042URPO 1 4 19 AG 1 PF i LWA001URPO 1 4 39 AG FAMi A001URKI 2 6 4 PFPF A002URE1 1 4 27 AL A002URK1 2 6 5 AT PFPF A003URE2 1 4 38 A003URK1 2 6 13 AW PGLSPA668WREZ 2 5 1 7 FFTA A001URKO0 1 4 7 AM PGLSPA670WREZ 2 5 1 7 BA FH DZA035WRE1 1 1 1 5 PHOK A002URF1 1 4 31 AT FH HZA075WREO 1 1 5 AS PPACGA101WREO 1 4 40 AF FPWBFA309WRE4 1 1 3 AT PPi
50. ONDITION DURING DOOR OPEN eme CONTACT COOKING NO COOKING Monitored latch Closed Opened switch COM NC Opened Closed Stop switch COM NO Closed Opened Monitor switch Closed Opened COM NC Opened Closed The circuit to the high voltage transformer is cut off when the contacts of relay RY2 and the contacts COM NO of the monitored latch switch SW1 and monitor switch SW3 are made open The circuit to the fan motor is cut off when the relay RY6 is made open The circuit to the turntable motor is cut off when the contacts COM NO of the moni tored latch switch SW1 are made open The oven lamp remains on even if the oven door is opened after the cooking cycle has been inter rupted because the relay RY1 stays closed Shown in the display is remaining time 6 MONITOR SWITCH CIRCUIT The monitor switch SW3 is mechanically controlled by the oven door and monitors the operation of the monitored latch switch SW1 1 When the oven door is opened during or after the cycle cooking program the monitored latch switch SW1 and stop switch SW2 must open their contacts COM NO first And the contacts COMNC of the monitored latch switch SW1 are made closed After that the contacts COM NC of the monitor switch SW3 be closed and the contacts COM NO of monitor switch SW3 are made open 2 When the oven door is closed the contacts COMNC of the monitor switch SW3 must be opened and the contacts NO
51. PFAOOSUR10 1 4 20 AK FROLPAO60WRKO 1 6 1 AW PREFHAOO1URPO 1 4 15 5 FW VZA074URE4 2 6 9 AN PSKR A010URPO 1 4 11 AF FW VZA104URE2 2 6 8 BD PSKR A012URPO 1 4 28 AG PSKR A013URPO 1 4 21 AG GCABDAOOSURP 1 1 2 1 BC PSKR A014URPO 1 4 22 AF GCABUBO51WRPZ 7 2 2 BM PSKR A015URPO 1 4 23 GCABUB052WRPZ 1 2 2 BN PSKR A016URPO 1 4 24 AF GCOVHA002URPO 1 4 34 AG PSKR A308WRF1 1 4 29 AL GCOVHA024URF0 2 5 1 1 PSLDHA002URP3 1 4 41 AS GDA i A003URP3 1 2 4 PSLDHAOO5URPO 1 4 25 AQ GLEGPA057WRE2 1 2 3 PSPAGA001WREO 1 4 42 GMAD i A1 63WRRZ 2 8 5 AL PSRA A001URHO 2 6 14 AZ GWAKPA046WRTZ 2 5 1 3 BD PSRA A025WRP1 2 6 3 AY GWAKPBO45WRFZ 2 5 1 3 AT GWAKPB048WRFZ 2 5 1 8 AT QACCVA004URE3 1 1 2 AT 1 QFS BA012WRZZ 1 1 AG HPNLCC003WRRZ 2 3 4 AX QSW MA146WRZ1 1 SW1 AM HPNLCC004WRRZ 2 3 4 1 SW3 AM HPNLCC006WRRZ 2 3 4 QSW MA147WRZ1 1 SW2 AM T J 77 1 SW4 AM JBTN B367WRFZ 2 3 6 AG 1 4 14 JBTN B368WRRZ 2 3 7 AG 1 JBTN B369WRRZ 2 3 8 AG RC QZA219WRE1 1 5 JBTN B370WRFZ 2 3 9 AG RHET A231WRZ1 1 GH AU JBTN B371WRTZ 2 3 6 RHET A269WRZ1 1 JBTN B372WRRZ 2 8 7 AG RLMPTAO66WRE1 1 OL AP JBTN B373WRRZ 2 3 8 RMOTDA267WRZ1 1 JBTN B374WRTZ 2 3 9 AH RMOTDA269WRZ1 1 DM AP JHNDPA259WREZ 2 5 1 4 RMOTEA00 2URE2 1 AV JHNDPA260WRFZ 2 5 1 9 RMOTEA41 5WRZ1 1 CM BB JHNDPA261WRFZ 2 5 1 10 AG RTHM A098WREO 1 TC1 AK JHNDPA262WRFZ 2 5 1 10 AR RTHM A109WREO 1 TC
52. PO AG Convection fan 4 31 PHOK A002URF 1 AT Latch hook 4 32 PDUC A016URF1 AQ Fan duct 4 33 NFANJAOS8WREO AG Fan blade 4 34 2 AG Bottom heater cover 4 35 LANGFA001URP1 AL Chassis support 4 36 NCPL A040WRE2 AL Coupling 4 37 PCOVPA309WREO AF Waveguide cover 4 38 PFPF A003URE2 AM Heat insulating material 4 39 PFiLWA001URPO AG Lamp filter 4 40 PPACGA101WREO AF O ring 4 41 PSLDHA002URP3 5 Heater cover right 4 42 PSPAGAOO1WREO AB Vibration proof cushion 4 43 LBNDKA11 1WRP1 AG Capacitor holder MISCELLANEOUS 6 1 FROLPAOGOWRKO AW Roller stay 6 2 NTNT A040WREO AZ Turntable tray 6 10 LHLDKA008WRF1 AF P clip SCREWS NUTS AND WASHERS 7 1 XHPS740P08K00 AB Screw 4mm x 8mm 7 2 LX EZA042WREO AB Special screw 7 3 XCBWW30P06000 AA Screw 3mm x 6mm 7 4 XNEUW40 32000 AA Nut 4mm x 3 2mm 7 5 XRES740 06000 AB Ring 3 R939 W PRICE NEW PART NO PARTS CODE RANK MARK RANK 1 OVEN PARTS 7 6 XWSUW40 10000 AA Washer 4mm x 1 0mm 7 7 XEPS740P25000 AB Screw 4mm x 25mm 7 8 XHPS730P06000 AB Screw 3mm x 6mm 7 9 XJPS740P10X00 AB Screw 4mm x 10mm 7 10 XHPS740P06000 AB Screw 4mm x 6mm 7 11 XOTWW40P10000 AA Screw 4mm x 10mm 7 12 XBPWW30P05K00 AA Screw 3mm x 5mm 7 13 XHTWW40P08000 AC Screw 4mm x 8mm 7 14 XJBS730P16000 AC Screw 3mm x 16mm 7 15 XHTS740PO8RVO AG Screw 4mm x 8mm 7 16 LX CZAOO1UREO AC Special
53. R939 W SHARP SERVICE MANUAL S9614R939PHW MICROWAVE OVEN WITH GRILL AND CONVECTION MODELS R 939 BK R 939 IN R 939 W In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used CONTENTS CHAPTER 1 BEFORE SERVICING CHAPTER 9 TOUCH CONTROL PANEL ASSEMBLY CHAPTER 2 WARNING TO SERVICE PERSONNEL CHAPTER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER CHAPTER 3 PRODUCT SPECIFICATIONS CHAPTER 11 COMPONENT REPLACEMENT AND CHAPTER 4 APPEARANCE VIEW ADJUSTMENT PROCEDURE CHAPTER 5 OPERATION SEQUENCE CHAPTER 12 MICROWAVE MEASUREMENT CHAPTER 6 FUNCTION OF IMPORTANT COMPO CHAPTER 13 TEST DATA AT A GLANCE NENTS CHAPTER 14 CIRCUIT DIAGRAMS CHAPTER 7 TROUBLESHOOTING GUIDE Parts List CHAPTER 8 TEST PROCEDURES EE EEE EE This document has been published to be used for S RATIO N after sales service only The contents are subject to change without notice CONTENTS CHAPTER 1 BEFORE SERVICING 1 GENERAL IMPORTANT INFORMA 2 WARNING 1 1 3 CAUTION MICROWAVE RADIATION 1 2 CHAPTER 2 WARNING TO SERVICE PERSON NEL CHAPTER 3 PRODUCT SPECIFICATIONS CHAPTER 4 APPEARANCE VIEW UE S loa 4 1 2 TOUCH CONTROL 4 1 CHAPTER 5 OPERATION SEQUENCE 1 OFF CONDITION es 5 1 2 MICROWAVE
54. STMENT 1 Adjustment If the monitored latch switch stop switch and monitor switch do not operate properly due to mis adjustment the following adjustment should be made 1 CARRY OUT 3D CHECKS 2 Loosen the two 2 screws holding the latch hook to the oven cavity front flange 3 With the door closed adjust the latch hook by moving it back and forward or up and down and out play of the door allowed by the latch hook should be less than 0 5 mm R939 W The horizontal position of the latch hook should be placed where the monitor switch has activated with the door closed The vertical position of the latch hook should be placed where the monitored latch switch and stop switch have activated with the door closed Secure the screws with washers firmly 5 Make sure of the all switches operation If the latch head has not pushed the plungers of the monitor switch with door closed adjust the latch hook position At that time the latch head should have pushed the plungers of the monitored latch switch and stop switch If the latch head has not pushed the plungers of the monitored latch switch and stop switch with door closed loose two 2 screws hold ing latch hook to oven cavity front flange and adjust the latch hook position After adjustment make sure of following 1 In and out play of door remains less than 0 5 mm when latched position First check the latch hook position pushing and pulling up
55. SWA4 is re sensed in the control unit and shut off relay RY8 is turned off 5 The rated voltage to the damper motor DM is stopped and the motor turns off 2 When oven is microwave cooking Damper is in the open position 3 When oven is convection cooking 1 Damper motor DM is energized right after the oven is started 2 When damper is in the closed position damper switch SW4 is OFF its signal is sensed by the control unit and shut off relay RY8 is de energized 3 The damper is held in the closed position during the convection cooking operation 4 At the end of the convection cooking when the fan motor EM stops shut off relay RY8 is energized and the damper is returned to the open position NOTE If the damper door is not in the proper position closed during convection grill or dual or open during microwave the control unit will stop oven operation after 1 minute 4 Operation of damper is shown below Cooking Mode Operation of Damper Microwave cooking Open Convection cooking Closed Grill during backed up with convection heating element Grill after convection heating element Open backed up has stopped Dual Microwave and Convection Closed Dual Microwave and Grill Open Open Fire sensing condition Closed Closed R939 W R939 W CHAPTER 7 TROUBLESHOOTING GUIDE 1 FOREWORD When troubleshooting the microwave oven it is helpful to follow the Sequence of Operation in
56. This circuit consists 40 segments and 16 common electrodes using a Liquid Crystal Display The Liquid Crystal Display LCD is drive by LCD driver IC3 10 Temperature Measurement Circuit OVEN THERMISTOR The temperature in the oven cavity is sensed by the thermistor The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI The LSI uses this information to control the relay and display units 11 Damper Switch A switch to tell the LSI if the damper is open or close 2 Servicing of Touch Control Panel We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so To perform the servicing power to the touch control panel is available either from the power line of the oven itself or from an exter nal power source 1 Servicing the touch control panel with power supply of the oven CAUTION THE HIGH VOLTAGE TRANSFORMER OF THE MICRO WAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD Therefore before checking the performance of the touch control panel 1 2 3 Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor 4 5 Disconnect the leads to the primary of the power transformer Ensure that these leads remain isolated from other components and oven chassis by us
57. UDGE BY THERMISTOR 6 2 21 DAMPER OPEN CLOSE MECHANISM 6 2 CHAPTER 7 TROUBLESHOOTING GUIDE 1 FOREWORDL e vasa metae aps 7 1 PI CHAR Tra abad 72 CHAPTER 8 TEST PROCEDURES 1 Procedure A MAGNETRON TEST 8 1 2 Procedure HIGH VOLTAGE TRANS FORMER TEST reet 8 2 3 Procedure HIGH VOLTAGE RECTIFI ER TEST edt 8 2 4 Procedure D HIGH VOLTAGE CAPACI TORTES Tanan senere 8 2 5 Procedure E SWITCH TEST 8 3 6 Procedure F THERMISTOR TEST 8 3 7 Procedure G THERMAL CUT OUT TEST acti een etn IS 8 3 8 Procedure H MOTOR WINDING TEST 8 3 9 Procedure I NOISE FILTER TEST 8 4 10 Procedure J BLOWN FUSE F1 20A 8 4 11 Procedure K BLOWN FUSE F2 8A NOISE FILTER 8 4 12 Procedure L GRILL HEATING ELE MENTS TOP AND CONVECTION HEATING ELEMENT TEST 8 4 13 Procedure M CONTROL PANEL AS SEMBLY TEST iita carni ii 8 4 14 Procedure N JOG AND SWITCH UNIT TES ie iii dime dies 8 5 15 Procedure O RELAY 8 6 16 Procedure P PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN cuina litis 8 6 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PAN En 9 1 2 SERVICING FOR TOUCH CONTROL PANEL 2
58. ame with the two 2 screws Re install the latch spring to the latch head Re install the latch spring to the door frame Re install latch head to door frame Re install door panel to door frame Hold the door panel to the door frame with eight 8 screws 5 6 Re install choke cover to door panel by clipping into position 7 Locate door panel hinge pins into cavity hinge location holes 8 Re install the door stopper to the chock cover NOTE After any service to the door 1 Make sure that the monitor switch monitored latch switch and stop switch are operating properly Refer to chapter Test Procedures 2 An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards Refer to Microwave Measurement Procedure 3 After any service make sure of the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through centre of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approved micro wave survey meter Refer to Microwave Measurement Procedure 11 7 R939 W NOTE The door on a microwave oven is designed to act as an elec tronic seal preventing the leakage of microwave energy from oven cav
59. amod wy 4 Control Unit C R939 W 6 19 HAZZNA 0 A y ceo IQ 5 5 214 i IEA OE Ca 01 19 gt N TR SIG eig 6101 K E ART AE oim CONO 9101 on Lo gt L99L VIA S ISES 535 ISES 525 AES 524 Ry an 2 522 532 Q lazo 332 333 lo 282 RSS RSH glo 8 3 DIC ajo asc E 3 RES 28 08 REE OS G 2 F2 To 15 alts ji bi T sa Bl lt e 19 S 19 IN Figure S 3 CPU Unit Circuit 14 7 R939 W IFCUI 5 Indicator C
60. beh vs N r Du testat f rdigt utf r Du 3 Steg kontrollen ochansluter ledningarna till transformatorns prim rsida igen KOM IH G ATT KONTROLLERA 4 STEG Anslut alla ledningar som anv nts vid testning S tt tillbaka ytterh ljet Anslut str mk llan p nytt S tt p ugnen Kontrollera alla funktioner 1 2 3 UD 4 Mikrov gsugnar f r inte anv ndas tomma Kontrollera mikrov gsstr lningen i olika delar av ugnen genom att placera en kopp med kallt vatten p ugnens tallrik st ng d rren st ll in HIGH och st ll in 2 minuter p timern N r tv minuter har g tt timem visar 0 kontrollerar du om vattnet r varmt Om vattnet fortfarande r kallt utf r Du 3 steg kontroller och kontrollerar anslutningarna till varje enskild komponent p nytt N r all service r klar och ugnen ihopskruvad skall ugnens uteffekt och eventuellt mikrov gsl ckage kontrolleras R939 W I forni a microonde contengono un circuito elettrico in grado di generare tensioni e correnti estremamente elevate L eventuale contatto con i seguenti componenti pu causare la folgorazione condensatore ad alta tensione trasformatore ad alta tensione magnetron rettificatore alta tensione cablaggio ad alta tensione TRE OPERAZIONI IMPORTANTI PER INCOMINCIARE 1 Scollegare l alimentazione elettrica 2 Verificare che la porta sia bloccata in posizioneta aper 3 Scaricare il condensatore ad alta tensione ATT
61. by touching CONVECTION button When the START button is touched the following operations occur 1 The relays RY1 RY6 and RY7 are energized the oven lamp turn table motor fan motor and convection motor are turned on The relay 4 and are is energized and the main supply volt age is applied to the convection heating element and the grill heat ing elements After the temperature of oven cavity rises to the selected one the oven will continue to turned the convection heating element on and off to maintain the temperature for 30 minutes And simultaneously the grill heating element will be operated at 10 power output R939 W 3 CONVECTION COOKING by 250 C Rotate the COOKING MODE dial to the convection setting And enter the cooking time by rotating the TIMER WEIGHT dial And select the desired cooking temperature 250 C by pressing the CON VECTION button When the START button is pressed the following operations occur 1 The relays RY1 RY6 and are energized the oven lamp turn table motor fan motor and convection motor are turned on The relay 4 are energized and the main supply voltage is applied to the convection heating element and the grill heating elements The oven will continue to turn the convection heating element on and off to maintain the temperature for the programmed cooking time And simultaneously the grill heating elements will be opera
62. cavity are not intact 3 If the door is not closed 4 If the outer case cabinet is not fitted WARNING FOR WIRING To prevent an electric shock take the following manners 1 Before wiring 1 Disconnect the power supply cord 2 Open the door and block it open 3 Discharge the high voltage capacitor and wait for 60 seconds 2 Don t let the wire leads touch to the following parts 1 High voltage parts Magnetron High voltage transformer High voltage capacitor and High voltage rectifier assembly 2 Hot parts Grill heating element Convection heating element Oven lamp Magnetron High voltage transformer and Oven cavity 3 Sharp edge Bottom plate Oven cavity Waveguide flange Chassis support and other metallic plate 4 Movable parts to prevent a fault Fan blade Fan motor Switch Turntable motor Convection motor convection fan and cooling fan 3 Do not catch the wire leads in the outer case cabinet 4 Insert the positive lock connector certainly until its pin is locked And make sure that the wire leads should not come off even if the wire leads is pulled 5 To prevent an error function connect the wire leads correctly refer ring to the Pictorial Diagram Please refer to OVEN PARTS CABINET PARTS CONTROL PANEL PARTS DOOR PARTS when carrying out any of the following removal proce dures 2 OUTER CASE REMOVAL To remove the outer case procedure as follows 1 Disconnect t
63. d A har en sp nning verstigande 250V Huom Huolto ohjeeseen merkitty A osat joissa j nnite on yli 250 V Bemerk Deler som er merket A er utsatt for spenninger over 250V til jord Bem rk Dele m rket med A benyttes med h jere sp nding end 250 volt Never operate the oven until the following points are ensured A The door is tightly closed B The door brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service engineers Removal of the outer wrap gives access to potentials above 250V All the parts marked on parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed R939 W 3 CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized VARNING MICKROVAGSSTRALING Personal f r inte uts ttas f r mikrov gsenergi som kan ustrala fr n magnetronen eller andre mikrov gsalstrande anordningar om dessa
64. d SALMOJIIA Ol ueno ul paonpold si ou Jo aq Bunuejs Joye ejnuiu 54046 ue o eje1edo jou seop 1 ma 20021 uey sayBiy SI USAO jo einjejeduie y Bunjooo ejofo Bunooo jo pue eJojeq sinus ajo o 4009 qui ueAQ eje1edo Jou op sped nq Auadoud sajesado Aejdsig 3009 eng pue 1daox3 passad SI 1 MWIS spuooes pue sejnuiu p Joye 60016 pesseJd si UONNA 4015 JO 0 s Bunjooo uaym dojs jou seop ue sued Aue Jo 51461 uano jou saop ejqejuun sajeado ajeJado jou uez 461 due jou saop Ue y jou JO OW ejqejuum pue 1461 100 seop due edsiq passa d si I HVIS ay uaym 5 JOU seop seye1edo Aejdsig pauado s Joop 161 jou seop passaid si UORNY 4015 jou seop ejdsiq pasojo pue peuedo SI Joop sy pue Jenno qui si puoo Jamod usym ejdsip ul sjeedde Jen
65. e 1 7 KV in the voltage doubler circuit 3 D2 of the rectifier is shorted The large electric currents flow through the high voltage winding of the high voltage transformer The large electric currents beyond 8A flow through the primary winding of the high voltage transformer The fuse F2 F8A blows by the large electric currents 7 The power supplying to the high voltage transformer is cut off 12 NOISE FILTER The noise filter assembly prevents radio frequency interference that might flow back in the power circuit 13 TURNTABLE MOTOR TTM The turntable motor rotates the turntable 14 FAN MOTOR FM The fan motor drives a blade which draws external cool air This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron This air is channelled through the oven cavity to remove steam and vapours given off from heating food It is then exhausted through the exhausting air vents of the oven cavity 15 CONVECTION MOTOR CM The convection motor drives the convection fan and provide the heated air 16 GRILL HEATING ELEMENT GH The grill heating elements are provided to brown the food and are located on the top of the oven cavity 17 CONVECTION HEATING ELEMENT CH The convection heating element situated at the rear of the oven cavity It is intended to heat air driven by the convection fan The heated air is kept in the oven and force circulated and reheated by the conv
66. ection heating element 18 CONVECTION COOKING SYSTEM This oven is designed with a hot air heating system where food is heated by forced circulation of the hot air produced by the grill heaters The air heated by the grill heating elements is circulated through the convection passage provided on the outer casing of the oven cavity by means of the convection fan which is driven by the convection motor It is then enters the inside of the oven through the vent holes provided on the back side of the oven Next the hot air heats the food on the turntable and leaves the oven cavity through the vent in the oven cav ity rear wall In this way the hot air circulates inside the oven cavity to raise its temperature and at the same time comes into contact with the food being cooked When the temperature inside the oven cavity reaches the selected temperature the heating elements are de ener gized When the temperature inside the oven cavity drops below the selected temperature the heating elements are energized again In this way the inside of the oven cavity is maintained at approximately the selected temperature When the convection time reaches 0 the heating elements are deen ergized and the convection fan stops operating and the oven shuts off At that time if the cavity air temperature has risen above 120 C the fan motor remains rotating Automatically the fan motor will be shut down at low temperature less than 105 C
67. erminal N and WHITE Short circuit AER y Between terminal L and RED Short circuit m L min Cx 20 Cy 20 R1 R2 If incorrect readings are obtained replace the noise filter unit 10mH 022 uF 4700pF 10 680kQ CARRY OUT 4R CHECKS 10 Procedure J BLOWN FUSE F1 20A CARRY OUT 3D CHECKS If the fuse F1 20A is blown there is shorts or grounds in electrical parts or wire harness Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION Only replace fuse with the correct value replacement 11 Procedure K BLOWN FUSE F2 8A NOISE FILTER CARRY OUT 3D CHECKS 1 If the fuse F2 is blown when the door is opened check the monitored latch switch SW1 and monitor switch SW3 2 If the fuse F2 is blown by incorrect door switching replace the defective switch es and the noise filter 3 If the fuse F2 F8A is blown there could be shorts the asymmetric rectifier or there is a ground in wire harness A short in the asymmetric rectifier may be occurred due to short or ground in H V rectifier magnetron high voltage transformer or H V wire Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION REPLACE NOISE FILTER 12 Procedure L GRILL HEATING ELEMENTS TOP AND CONVECTION HEATING ELE MENT TEST CARRY OUT 3D CHECKS Before carrying out the following tests make sure the heating element is cool completel
68. ernal power source Disconnect the touch control panel completely from the oven proper and short both ends of the door sensing switch on PWB of the touch control panel which brings about an operational state that is equivalent to the oven door being closed Connect an exter nal power source to the power input terminal of the touch control panel then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 3 Servicing Tools Tools required to service the touch control panel assembly 1 Soldering iron 60W It is recommended to use a soldering iron with a grounding termi nal 2 Oscilloscope Single beam frequency range DC 10 2 type or more advanced model 3 Others Hand tools 4 Other Precautions 1 Before turning on the power source of the control unit remove the aluminium foil applied for preventing static electricity 2 Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted 3 After aluminium foil is removed be careful that abnormal voltage due to static electricity etc is not applied to the input or output ter minals 4 Attach connectors electrolytic capacitors etc to PWB making sure that all connections are tight 5 Be sure to use specified components where high precision is required R939 W R939 W CHAPT
69. esired cooking time by rotating the TIMER WEIGHT dial When the START button is pressed the following operations occur 1 The numbers on the digital readout start the count down to zero 2 The oven lamp cooling fan motor and turntable motor are ener gized The relay is energized and the main supply voltage is applied to the top grill heating elements 4 NOTE The convection cooking condition will be carried out simulta neously until the temperature of the oven cavity rise to 220 C Now the food is cooked by the top grill heating elements 4 CONVECTION COOKING CONDITION 1 PRE HEATING by 40 C 130 C Rotate the COOKING MODE dial to the convection setting And programme the desired convection temperature of 40 C 1309 by touching CONVECTION button When the START button is touched the following operations occur 1 The relays RY1 RY6 are energized the oven lamp turn table motor fan motor and convection motor are turned on The relay RY4 is energized and the main supply voltage is applied to the convection heating element After the temperature of oven cavity rises to the selected one the oven will continue to turned the convection heating element on and off to maintain the temperature for 30 minutes 2 PRE HEATING by 160 C 250 C Rotate the COOKING MODE dial to the convection setting And programme the desired convection temperature of 160 C 250 C
70. has been removed in this event carry out 3D checks and then disconnect the leads to the primary of the high voltage transformer Ensure that these leadsre main isolated from other components and the oven chas sis Use insulation tape if necessary When the testing is completed carry out 3D checks and reconnectthe leads to the primary of the high voltage transformer 1 all leads removed from components dur ing testing 2 Replace the outer case cabinet 3 Reconnect the supply 4 Run the oven Check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on the oven turntable close the door and set the power to HIGH and set the microwave timer for two 2 minutes When the two minutes has elapsed timer at zero carefully check that the water is now hot If the water remains cold carry out 3D checks and re examine the connections to the component being tested When all service work is completed and the oven is fully assembled the microwave power output should be checked and a microwave leakage test should be carriedout Magnetronovens bevatten circuits die een zeer hoge spanning en stroom kunnen voortbrengen Contact met de volgende onderdelen kan elektrocutie tot gevolg hebben Hoogspanningscondensator hoogspanningstransformator magnetron hoogspanningsgelijkrichter hoogspannings kabelboom VERGEET
71. he oven from power supply 2 Open the oven door and wedge it open 3 Remove the one 1 screw holding the air duct to the oven cavity rear plate 4 Remove the air duct 5 Remove the nine 9 screws from rear and along the side edge of case 3 HIGH VOLTAGE COMPONENTS REMOVAL 6 Slide the entire case back about 3 cm to free it from retaining clips on the cavity face plate 7 Lift the entire case from the oven 8 Discharge the H V capacitor before carrying out any further work 9 Do not operate the oven with the outer case removed NOTE Step 1 2 and 8 form the basis of the 3D checks CAUTION DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENT OR WIRING HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY To remove the components proceed as follows 1 CARRY OUT 3D CHECKS 2 Disconnect the filament lead of the high voltage transformer and the high voltage wire of the high voltage transformer from the high voltage capacitor 3 Disconnect the high voltage wire from the magnetron R939 W 4 Remove one 1 screw holding earth side terminal of the high volt age rectifier assembly to the base plate through the capacitor holder 5 Release the capacitor holder from the base plate Remove the high voltage capacitor from the capacitor holder 7 Disconnect the high voltage rectifier assembly from the high volt age capacitor 4 HIGH VOLTAGE TRANSFORMER REMOVAL To remove
72. heating element is free 3 CONVECTION MOTOR REMOVAL 1 Remove the convection unit assembly refer to the CONVECTION UNIT ASSEMBLY REMOVAL 2 Remove the one 1 nut and washer from the convection motor shaft 3 Remove the convection fan from the convection motor shaft 4 Remove the pipe from the convection motor shaft 5 Remove the two 2 screws holding the convection motor angle to the convection duct 6 Remove the cooling fan from the convection motor shaft 7 Remove the two 2 screws holding the convection motor to the convection motor angle 8 Remove the one 1 ring from the convection motor shaft 9 Now the convection motor is free 10 POSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVAL POSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CON NECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVALPOSITIVE LOCK CONNECTOR REMOVAL 1 CARRY OUT 3D CHECKS 2 Push the lever of positive lock connector 3 Pull down the positive lock connector CAUTION WHEN CONNECTING THE POSITIVE LOCK CONNEC TORS TO THE TERMINALS CONNECT THE POSITIVE LOCK SO THAT THE LEVER FACES YOU 11 OVEN LAMP SOCKET REMOVAL 1 CARRY OUT 3D CHECKS 2 Remove the wire leads as Positive lock connector removal above 3 Lift up the
73. ing insulation tape 6 After that procedure re connect the power supply cord After checking the performance of the touch control panel 1 Disconnect the power supply cord 2 Open the door and block it open 3 Re connect the leads to the primary of the power transformer 4 Re install the outer case cabinet 5 Re connect the power supply cord after the outer case is installed 6 Run the oven and check all functions a On some models the power supply cord between the touch control panel and the oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other For those models therefore it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper in this case you must short both ends of the door sensing switch on PWB of the touch control panel with a jumper which brings about an operational state that is equivalent to the oven door being closed As for the sensor related controls of the touch control panel checking them is possible if the dummy resistor s with resistance equal to that of the controls are used 2 Servicing the touch control panel with power supply from an ext
74. initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately Close the door and turn the oven ON with the timer set for several minutes If the water begins to boil before the survey is completed replace it with 275ml of cool water 5 Move the probe slowly not faster that 2 5cm sec along the gap The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven Microwave leakage measurement at 5 cm distance 12 1 CHAPTER 13 TEST DATA 5 SYMBOL VALUE DATA Fuse F1 20A 250V Fuse Noise filter F2 F8A Thermal cut out TC1 125 C Off Thermal cut out TC2 TC3 170 C Off 155 C On Thermistor Approx 359 9 152 at 20 C 30 C Grill heating element GH Approx 37 40 39 70 18 70 19 850 x 2 Insulation resistance gt Convection heating element CH Approx 34 090 36 720 Insulation resistance gt 10MQ Oven lamp OL 240 250V 25W High voltage capacitor C AC 2100V 1 16uF Magnetron MG Filament lt 10 Filament chassis oo ohm High voltage transformer T Filament winding lt
75. ion of the thermometer must be scaled by 0 1 C at minimum and an accurate thermometer 7 The water load must be 1000 5 g 8 t is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included NOTE The operation time of the microwave oven is t 3 sec 3 sec is magnetron filament heat up time Measuring method 1 1 Measure the initial temperature of the water before the water is added to the vessel Example The initial temperature T1 11 C 2 Add the 1 litre water to the vessel 3 Place the load on the centre of the shelf 4 Operate the microwave oven at 100 for the temperature of the water rises by a value AT of 10 C 5 Stir the water to equalize temperature throughout the vessel 6 Measure the final water temperature Example The final temperature T2 21 C 7 Calculate the microwave power output P in watts from above formula Room temperature i 21 Initial temperature 4 400 0 1 11 Temperature after 47 3 50 sec annen nennen T2 21 C Temperature difference Cold Warm AT 2 1 AT 10 Measured output power The equation is 90 AT P 90 x 10 C 900 Watts JUDGEMENT The measured output power should be at least 15 of the rated output power CAUTION 1 C CORRESPONDS TO 90 WATTS REPEAT MEASUREMENT IF THE POWER IS INSUFFI
76. ircuito la conexi n del condensador de alto voltaje esto es del conductor de conexi n del rectificador de alto voltaje al chasis con un destornillador de mango aislado Se recomienda encarecidamente que siempre que sea posible la localizaci n de fallos se realice con la alimentaci n desconectada Puede ser que en algunos casos sea necesario conectar la alimentaci n despu s de haber retirado la carcasa exterior En este caso realice las comprobaciones 3D y luego desconecte los conductores del primario del transformador de alimentaci n Aseg rese de que estos conductores permanezcan aislados de otros componentes y del chasis del horno Use cinta aislante si es necesario Cuando termine la prueba efect e las comprobaciones 3D y reconecte los conductores al primario del transformador de alimentaci n RECUERDE LA COMPROBACI N 4C 1 Conecte todos los componentes desconectados de los componentes durante la prueba 2 Coloque la carcasa exterior cabina 3 Conecte la alimentaci n 4 Compruebe todas sus funciones despues de poner en marcha el horno Los hornos de microondas no deben funcionar vac os Para comprobar la presencia de energ a de microondas dentro de una cavidad coloque una taza de agua fr a en el plato giratorio del horno cierre la puerta y ponga la potencia en HIGH alta y coloque el temporizador en dos 2 minutos Cuando transcurran los dos minutos temporizador a cero compruebe cuidadosamente
77. ise to more than 40 after 4 minutes and 15 seconds from when the oven is started in convection grill or dual cooking mode the oven is turned off When the thermistor or the wire harness to the thermistor is opened the oven is turned off after 4 minutes and 15 seconds because this condition is same as above 21 DAMPER OPEN CLOSE MECHANISM Damper position is set automatically by damper motor DM damper switch and motor cam These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the CPU unit 1 Microwave Cooking Damper is in the open position because a portion of cooling air is channelled through the cavity to remove steam and vapours given off from the heating foods It is then exhausted at the top of the oven cav ity into a condensation compartment 2 Convection Cooking Damper is in the closed position so that no hot air will be allowed to leak out the oven cavity 3 Damper Operation 1 When power supply cord is plugged in or when the control unit resumes after energy save mode finishes 1 When power supply cord is plugged in a signal is sensed in the control unit and operates shut off relay RY8 2 Contacts of shut off relay RY8 close the damper motor DM is energized opening the damper door 3 When the damper is moved to the open position by the damper cam damper switch SW4 is closed ON position 4 The signal of damper switch
78. ity during cook cycle This function does not require that door be air tight moisture condensation tight or light tight Therefore occasional appearance of moisture light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from oven cavity Door 2 assembly q Lower oven Pin hinge Figure C 8 Door Replacement R939 W CHAPTER 12 MICROWAVE MEASUREMENT After adjustment of door latch switches monitor switch and door are completed individually or collectively the following leakage test must be per formed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW cm at any point 5cm or more from external surface of the oven PREPARATION FOR TESTING Before beginning the actual test for leakage proceed as follows 1 Make sure that the test instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water
79. ly The contents are subject to change without notice R939 W 1 OVEN PARTS T E RN d DIST ES x Y ES Q d a R939 W PRICE NEW PART NO PARTS CODE RANK MARK RANK DESCRIPTION 1 OVEN PARTS ELECTRIC PARTS RC QZA219WRE1 AS High voltage capacitor RHET A269WRZ1 AY Convection heating element CM RMOTEA415WRZ1 BB Convection motor DM RMOTDA269WRZ1 AP Damper motor Fi QFS BA012WRZZ AG Fuse 20A FM RMOTEA002URE2 AV Fan motor GH RHET A231WRZ1 AU Grill heating element MG RV MZA264WRE1 BG Magnetron OL RLMPTA066WRE1 AP Oven lamp SW1 QSW MA146WRZ1 AM Monitored latch switch SW2 QSW MA147WRZ1 AM Stop switch SW3 QSW MA146WRZ1 AM Monitor switch SW4 QSW MA147WRZ1 AM Damper switch T RTRN A016URE2 BL High voltage transformer TC1 RTHM A098WREO AK Thermal cut out 125 C MG TC2 RTHM A109WREO AM Thermal cut out 170 C GRILL TC3 RTHM A109WREO AM Thermal cut out 170 C CONV TIM RMOTDA267WRZ1 AP Turntable motor 1 1 FH DZAO35WRE1 AS High voltage rectifier assembly 1 2 QACCVA004URE3 AT Power supply cord 1 3 FPWBFA309WRE4 AT Noise filter F2 Fuse F8A 1 4
80. measuring maximum width depth and height Height 272 mm Actual capacity for holding food is less Depth 395 mm Turntable diameter 362 mm Control Complement Net Weight Touch Control System Timer 0 90 minutes Clock 1 00 12 59 or 0 00 23 59 Microwave Power for Variable Cooking Repetition Rate ODDW viva iii Full power throughout the cooking time 6 0 70 of FULL Power 450W cia approx 50 of FULL Power LOW id approx 30 of FULL Power 2 pend 10 of FULL Power Convection temperature control range 250 C 230 C 220 C 200 C 190 C 180 C 160 C 130 C 100 C and 40 C LESS w MORE a buttons LANGUAGE button INFORMATION button EXPRESS COOK button EXPRESS DEFROST button AUTO REHEAT button AUTO COOK button COOKING MODE dial CONVECTION button MICROWAVE POWER LEVEL button TIMER WEIGHT dial CLOCK setting button STOP button START 1min button Approx 23 kg CHAPTER 4 APPEARANCE VIEW 1 OVEN Grill heating element R939 W Oven lamp Control panel Shelf runners Oven cavity Coupling 1 2 3 4 5 Waveguide cover 6 7 8 Door seals and sealing surfaces 9 Door opening handle d 10 Air vent openings 11 Outer cabinet 12 Power cord 13 Turntable
81. mo mode 2 MICROWAVE COOKING CONDITION 1 HIGH COOKING Rotate the COOKING MODE dial to the micro setting And press the POWER LEVEL button once And enter the cooking time by rotating the TIMER WEIGHT dial And start the oven by pressing START but ton Function sequence Figure O 2 on page 14 2 CONNECTED COMPONENTS RELAY Oven lamp Turntable motor RY1 High voltage transformer RY2 Fan motor RY6 1 The line voltage is supplied to the primary winding of the high volt age transformer The voltage is converted to about 3 3 volts A C output on the filament winding and high voltage of approximately 2000 volts A C on the secondary winding 2 The filament winding voltage 3 3 volts heats the magnetron fila ment and the high voltage 2000 volts is sent to the voltage dou bling circuit where it is doubled to negative voltage of approximately 4000 volts D C 3 The 2450 MHz microwave energy produced in the magnetron gen erates a wavelength of 12 24 cm This energy is channelled through the waveguide transport channel into the oven cavity where the food is placed to be cooked 4 When the cooking time is up a signal tone is heard and the relays RY1 RY2 RY6 go back to their home position The circuits to the oven lamp high voltage transformer fan motor and turntable motor are cut off 5 When the oven door is opened during a cooking cycle the switches come to the following condition C
82. municated among them are explained below 1 Jog and Switch Unit 1 Tact switch circuit The jog and switch unit is composed of a matrix signals generated in the LSI are sent to the jog and switch unit from P10 P11 P12 P13 P14 P15 P16 and P17 When a tact switch pad is touched a signal is completed through the jog and switch unit and passed back to the LSI through P70 P71 P72 and P73 to perform the function that was requested 2 Encoder The encoder converts the signal generated by LSI into the pulse signal and the pulse signal is returned to the LSI 3 Potentiometer circuit The circuit makes setting of the cooking mode by variable resis tance 2 Control Unit Control unit consists of LSI power source circuit synchronizing signal circuit ACL circuit buzzer circuit relay circuit temperature measure ment circuit indicator circuit and back light circuit 1 LSI This LSI controls the temperature measurement signal tact switch strobe signal relay driving signal for oven function and indicator signal 2 Power Source Circuit This circuit generates voltage necessary in the control unit Symbol Voltage Application 2 SERVICING FOR TOUCH CONTROL PANEL 1 Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits When dling these parts the following precautions should be strictly followed CMOS LSI have extremely high impedance at its
83. nd Switch unit wire harness connection before replacement The following symptoms indicate a defective Jog and Switch unit Replace the Jog and Switch unit 1 Tact switch a When touching the buttons a certain button produces no signal at all 8 4 R939 W b When touching the buttons sometimes a button produces no signal 2 Potentiometer a When rotating the potentiometer the cooking mode can not be selected 3 Encoder a When rotating the encoder the cooking time or the weight of food can not be entered 2 Control Panel The following symptoms indicate a defective control unit Before replacing the control unit perform the Jog and Switch unit test Procedure N to determine if control unit is faulty 1 In connection with buttons a When touching the buttons a certain group of buttons do not produce a signal b When touching the buttons no buttons produce a signal 2 connection with indicators a certain digit all or some segments do not light up b At a certain digit brightness is low e Wrong figure appears Only one indicator does not light up The corresponding segments of all digits do not light up or they continue to light up f A certain group of indicators do not light up 9 The figure of all digits flicker 3 2 3 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock does operate properly
84. no s Jamod ueuM vOz L 4 9514 Jenno em pebBnid si p109 amod USYM SSN SWOH BLOCKED COOLING FAN BLOCKED CONVECTION FAN NO POWER AT WALL OUTLET HOME FUSE OR BREAKER MIS ADJUSTMENT OF SWITCHES BLOCKED VENTILATION OPENINGS OPENED WIRE HARNESS SHORTED WIRE HARNESS OVEN LAMP OR SOCKET POWER SUPPLY CORD A FOIL PATTERN P W B O RELAY RY8 O RELAY O RELAY RY6 O RELAY RY5 O RELAY RY4 O RELAY RY3 O RELAY RY2 RELAY RY1 Z KEY UNIT TOUCH CONTROL PANEL TC TRANSFORMER CONVECTION HEATING ELEMENT GRILL HEATING ELEMENT NOISE FILTER FUSE 2 F8A gt FUSE F1 20A NOISE FILTER DAMPER MOTOR DM CONVECTION FAN MOTOR FAN MOTOR FM TURNTABLE MOTOR TM THERMAL CUT OUT 170 C TC3 THERMAL CUT OUT 170 C TC2 THERMAL CUT OUT 125 C TC1 THERMISTOR DAMPER SWITCH SW4 MONITOR SWITCH SW3 STOP SWITCH SW2 MONITORED LATCH SWITCH SW1 O HIGH VOLTAGE CAPACITOR H V HARNESS H V RECTIFIER ASSEMBLY HIGH VOLTAGE TRANSFORMER MAGNETRON peuedo si Joop eu uaym 84 24 esn NI1808d SLYYd 3ALLO333G 3SNVI ITHISSOd 34NAJDO YA 1531 TIOOYDIN SNDIOOO SNDIOOO
85. of monitor switch SW3 must be closed After that the con tacts COM NO of the monitored latch switch SW1 and the stop switch SW2 are made closed And the contacts COM NC of the monitored latch switch SW1 are made open 3 When the oven door is opened and the contacts COM NO of the monitored latch switch SW1 remain closed the fuse F2 F8A will blow Because the relay RY1 and monitor switch SW3 are closed and short circuit is caused 2 MEDIUM HIGH MEDIUM MEDIUM LOW LOW COOKING When the microwave oven is preset for variable cooking power the line voltage is supplied to the high voltage transformer intermittently within 32 second time base through the relay contact which is cou pled with the current limiting relay RY2 The following levels of micro wave power are given SETTING 32 sec ON 100 EN 24 8 sec OFF 70 MEE Approx 70 HIGH Approx 70 18 sec ON 14 sec OFF 50 MEDIUM Approx 50 30 MEDIUM 12 sec ON 20 sec OFF i LOW Approx 3096 6 sec ON 26 sec OFF 10 Low EMI Approx 1096 NOTE The ON OFF time ratio does not exactly correspond to the percentage of microwave power because approx 3 seconds are needed for heating up the magnetron filament 3 GRILL COOKING CONDITION 1 TOP GRILL Figure O 3 In this condition the food is cooked by the top grill heating element Rotate the COOKING MODE dial to zw GRILL setting And enter the d
86. ommon terminal to Normally open terminal Common terminal to Normally close terminal Released Open circuit Short circuit Depressed Short circuit Open circuit If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT CHECKS 6 Procedure F THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect the connector B from CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to Pin No s C1 and C3 of the thermistor harness Room Temperature Resistance 20 C 30 C Approximately 359 9 152 If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS 7 Procedure G THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the thermal cut out Then using an ohmmeter make a continuity test across the two terminals as described in the below Table Thermal Cut out Test Temperature of ON condition Temperature of OFF condition Indication of ohmmeter When room Parts Name re closed circuit open circuit temperature is approx 20 C Thermal cut out TC1 125 C This is not resetable type Above 125 C Closed circuit Thermal cut out TC2 170 C Cuts back in at 155 C Above 170 C Closed circuit Thermal cut out TC3 170 C Cuts back in at 155 C Above 170 C Closed circuit If incorrect readings are
87. per portion of the door toward the oven face Then check the lower latch hook position pushing and pulling lower portion of the door toward the oven face Both results play of the door should be less than 0 5mm The contacts COM NO of the stop switch and the monitored latch switch open within 1 8mm gap between right side of cavity face plate and door when door is opened When the door is closed the contacts COM NO of the stop switch close 16 DOOR REPLACEMENT OQ Qu REMOVAL Disconnect the oven from the power supply Push the door slightly Remove the door stopper from the choke cover Lift the door upwards Now door assembly is free from oven cavity Insert an putty knife thickness of about 0 5mm into the gap between the choke cover and door frame as shown in Figure C 7 to free engaging parts 7 Release choke cover from door panel 8 Now choke cover is free Putty knife Choke cover Door frame Figure C 7 Door Disassembly DOOR PANEL 9 Remove the eight 8 screws holding the door panel to the door frame 10 Now door panel is free 11 6 4 When the door is closed the contacts COM NC of the monitor switch and monitored latch switch open And the contacts COM NO of their switches close Re install outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Micro wave Measurement Procedure Door
88. ply voltage is applied to the convection heating element The relay RY2 is energized and the microwave energy is generated by magnetron Now the food is cooked by microwave and convection energy simultaneously 2 MICROWAVE AND TOP GRILL Figure O 5b Rotate the COOKING MODE dial to DUAL 2 setting And enter the desired cooking time by rotating the TIMER WEIGHT dial And press POWER LEVEL button to set the desired microwave power When the START button is pressed the following operations occur Bevi 1 The numbers on the digital read out start the count down to zero 2 3 The oven lamp fan motor and turntable motor are energized The relay RY3 is energized and the main supply voltage is applied to the grill heating elements The relay RY2 is energized and the microwave energy is generated by magnetron Now the food is cooked by microwave and grill simultaneously R939 W 6 ON OFF TIME RATIO In dual cooking the magnetron operate within a 48 second time base The following table is the ON OFF time ratio at each power output of the magnetron POWER OUTPUT ON TIME OFF TIME 100 48 sec 0 sec 70 36 sec 12 sec 50 26 sec 22 sec 30 16 sec 32 sec 10 8 sec 40 sec 7 AUTOMATIC COOKING Auto Cook functions automatically work out the correct cooking mode and cooking time and or cooking temperature They will cook accord ing to the special cooking sequence
89. r magnetron high voltage rectifier high voltage wire or filament winding of the high voltage transformer is shorted CARRY OUT CHECKS NOTE FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS 4 Procedure D HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS Isolate the high voltage capacitor from the circuit Continuity check must be carried out with measuring instrument which set to the highest resistance range A normal capacitor shows continuity for a short time kick and then a resistance of about 10MQ after it has been charged An open capacitor constantly shows a resistance about 10 MQ because of its internal resistance 1 2 3 4 A short circuited capacitor shows continuity all the time 5 6 When the internal wire is opened in the high voltage capacitor shows an infinite resistance 7 The resistance across all the terminals and the chassis must be infinite when the capacitor is normal 8 2 R939 W If incorrect reading are obtained the high voltage capacitor must be replaced CARRY OUT 4R CHECKS 5 Procedure E SWITCH TEST CARRY OUT 3D CHECKS Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table Table Terminal Connection of Switch Plunger Operation C
90. re una tazza di acqua fredda sul piatto rotante del forno chiudere la porta regolare la potenza su HIGH ed impostate il temporizzatore su due 2 minuti Trascorsi i due minuti temporizzatore a zero controllare accuratamente che ora l acqua sia calda Se l acqua rimasta fredda eseguire i tre controlli iniziali e verificare nuovamente i collegamenti del componente in questione Dopo aver portato a termine le operazioni di manutenzione e rimontato il forno necessario controllare la potenza delle microonde emesse ed eseguire un test per verificare che non vi sia alcuna dispersione R939 W CHAPTER 3 PRODUCT SPECIFICATIONS TEM DESCRIPTION Power Requirements 230 Volts 50 Hertz Single phase 3 wire earthed Power Consumption Microwave cooking 1 5 kW Approx 6 7A Convection cooking 2 8 KW Approx 12 2A Grill cooking 2 8 KW Approx 12 2A Dual cooking Micro and Grill 2 80kW Approx 12 4A Micro and Convection 2 95kW Approx 13 0A Power Output Grill heating element Power Output 900 watts nominal of RF microwave energy IEC60705 Test Procedure Operating frequency 2450 MHz 1300W 650W x 2 Convection heating element Power Output Outer Case Dimensions 1450W Width 550 mm Height 368 mm including foot Depth 537 mm NOTE The Depth does not include the door opening handle Cooking Cavity Dimensions Width 375 mm NOTE Internal capacity is calculated by
91. ron Remove the chassis support from the oven cavity Disconnect the wire leads from the fan duct Remove the one 1 screw holding the fan duct to the back plate Release the tabs of the fan duct from back plate Remove the fan duct from the oven 0 the fan blade from the fan motor shaft according to the fol lowing procedure i Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers 11 2 8 Now the high voltage rectifier assembly and the high voltage capacitor should be free CAUTION WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY ENSURE THAT THE CATHODE EARTH CONNECTION IS SECURELY FIXED TO THE BASE PLATE THROUGH THE CAPACITOR HOLDER WITH AN EARTHING SCREW 4 Remove the two 2 screws holding the transformer to the base plate 5 Remove the transformer 6 Now the high voltage transformer is free 5 Remove the magnetron from the waveguide with care so the mag netron antenna is not hit by any metal object around the antenna 6 Now the magnetron is free CAUTION CAUTION WHEN REPLACING THE MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND THE MAG NETRON MOUNTING SCREWS ARE TIGHTENED SECURELY 7 Remove the four 4 screws holding the power unit to the control panel 8 Remove the one 1 screw holding the LCD holder to the control panel 9 Remove the control unit assembly CPU unit and Power unit from the control panel 10 Remove the seven 7 scre
92. screw 7 17 XOTS740P10000 AB Screw 4mm x 10mm 2 CONTROL PANEL AND DOOR PARTS Actual wire harness may be different than illustration OF R939 W PRICE NEW PART NO PARTS CODE RANK MARK RANK DESCRIPTION 2 CONTROL PANEL AND DOOR PARTS CONTROL PANEL PARTS 3 1 DPWB A406DRKZ BR CPU unit 3 2 DPWBFA226URKO BQ Power unit 3 3 DPWB A411DRKZ BC Switch unit 3 4 HPNLCCOO6WRRZ AV Control panel R 939 W 3 4 HPNLCCO004WRRZ AV Control panel R 939 BK 3 4 HPNLCC003WRRZ AX Control panel R 939 IN 3 5 GMAD i A163WRRZ AL Display window 3 6 JBTN B367WRFZ AG Key button A R 939 W 3 6 JBTN B371WRTZ AG Key button R 939 BK R 939 IN 3 7 JBTN B368WRRZ AG Key button B R 939 W 3 7 JBTN B372WRRZ AG Key button R 939 BK R 939 IN 3 8 JBTN B369WRRZ AG Key button C R 939 W 3 8 JBTN B373WRRZ AG Key button R 939 BK R 939 IN 3 9 JBTN B370WRFZ AG Clear button R 939 W 3 9 JBTN B374WRTZ AH Clear button R 939 BK R 939 IN 3 10 JKNBKA766WRFZ AG Timer knob R 939 W 3 10 JKNBKA7 69WRTZ AG Timer knob R 939 BK R 939 IN 3 11 JKNBKA767WRFZ AG Vari knob R 939 W 3 11 JKNB
93. tacts COM NO of the switch must be closed When the oven door is opened the contacts COMNO of switch must be opened 4 MONITOR SWITCH SW3 The monitor switch is activated the contacts opened by the upper latch head on the door while the door is closed The switch is intended to render the oven inoperative by means of blowing the fuse F2 F8A when the contacts of the monitored latch switch SW1 fail to open when the door is opened Function 1 When the door is opened the contacts COM NC of monitor switch SW3 close to the ON condition due to their being normally closed and contacts COM NO open At this time the contacts COM NO of monitored latch switch SW1 is in the OFF condition contacts open due to their being normally open contact switches As the door goes to a closed position the monitor switch SW3 con tacts COM NC are opened and contacts COM NO closed and then contacts COM NO of monitored latch switch SW1 and stop switch SW2 are closed On opening the door each of these switches operate inversely 3 If the door is opened and the monitored latch switch SW1 contacts fail to open the fuse 2 F8A blows immediately after closing of the monitor switch SW3 contacts CAUTION BEFORE REPLACING A NOISE FILTER BLOWN FUSE E2 F8A TEST THE MONITORED LATCH SWITCH SW1 AND MONITOR SWITCH SW3 FOR PROPER OPERA TION REFER TO CHAPTER TEST PROCEDURE 5 FUSE F1 20A 250V
94. ted at 1096 power output 4 CONVECTION COOKING by 40 C 230 C Rotate the COOKING MODE dial to the a convection setting And enter the cooking time by rotating the TIMER WEIGHT dial And select the desired cooking temperature 40 C 230 C by pressing the CONVECTION button When the START button is pressed the follow ing operations occur 1 The relays RY1 RY6 are energized the oven lamp turn table motor fan motor and convection motor are turned on The relay RY4 is energized and the main supply voltage is applied to the convection heating element The oven will continue to turn the convection heating element on and off to maintain the temperature for the programmed cooking time 5 DUAL COOKING CONDITION 1 MICROWAVE AND CONVECTION Figure O 5a Rotate the COOKING MODE dial to DUAL 1 setting And enter the desired cooking time by rotating the TIMER WEIGHT dial And press POWER LEVEL button to set the desired microwave power And press the CONVECTION button to set the cooking temperature When the START button is pressed the following operations occur dtt ss NOTE The 10096 microwave power level can not be selected When the START button is touched the following operations occur 1 The numbers on the digital read out start the count down to zero 2 The oven lamp fan motor turntable motor and convection motor are energized The relay RY4 will be energized and the main sup
95. the components proceed as follows 1 2 CARRY OUT 3D CHECKS Disconnect the main wire harness from the high voltage trans former Disconnect the filament leads and high voltage wire of high voltage transformer from high voltage capacitor and the magnetron 5 MAGNETRON REMOVAL 1 2 CARRY OUT 3D CHECKS Disconnect the H V wire and filament lead of the transformer from the magnetron Carefully remove two 2 screws holding the magnetron to the waveguide when removing the screws hold the magnetron to pre vent it from falling Remove the one 1 screw holding the magnetron to the chassis support 6 CONTROL PANEL ASSEMBLY REMOVAL 1 2 3 CARRY OUT 3D CHECKS Disconnect the wire leads and the connectors from the power unit Remove the one 1 screw holding the control panel to the oven cavity face plate Remove the one 1 screw holding the earth wire to the oven cavity face plate Lift up the control panel assembly and pull it forward Now the control panel assembly is free Jog and Switch unit 6 Disconnect the connector CN G from the CPU unit 7 FAN MOTOR REREPLACEMENT 1 1 2 REMOVAL CARRY OUT 3D CHECKS Remove the one 1 screw holding the noise filter to the chassis support 3 Release the noise filter from the tabs of the fan duct 2 09 0 m Remove the three 3 screw holding the chassis support to the oven cavity front flange back plate and the magnet
96. ut circuit on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS STEPS OCCURRENCE CAUSE OR CORRECTION 4 The rated AC voltage is not present between Pin No 1 and 3 of the 4 pin connector E Check supply voltage and oven power cord Low voltage transformer or secondary circuit defective 2 The rated AC voltage is present at primary side of low voltage transformer Check and replace power unit 3 Only pattern at a is broken Insert jumper wire J1 and solder 4 Pattern at a and b broken unit CARRY OUT 3D CHECKS BEFORE NOTE At the time of these repairs make a visual inspection of the varistor for burn ing damage and examine the transformer with tester for the presence of layer If any abnormal condition is detected replace the power unit short circuit check primary coil resistance O Z b CARRY OUT 4R CHECKS m br VINO R939 W CHAPTER 9 TOUCH CONTROL PANEL ASSEMBLY 1 OUTLINE OF TOUCH CONTROL PANEL The control section consists of the following units as shown in the con trol panel circuit 1 Jog and Switch Unit 2 Control Unit The Control unit consists of Power unit and CPU unit The principal functions of these units and signals com
97. ven cavity temperature is above 120 C and the fan motor will stop if the oven cavity tempera ture is below 105 C 10 CONVECTION MOTOR OPERATION If the temperature of oven cavity is higher than 120 C after and when operated by 250 C convection cooking 250 C dual convection cook ing or 250 C preheating the convection motor will operate for maxi mum 1 minute until the oven cavity temperature drops below 105 C ON OFF TIME RATIO In grill cooking convection cooking or dual cooking the top heater bottom heater or magnetron operate within a 48 second time base The following table is the ON OFF time ratio at each power output of the top heaters bottom heater or magnetron R939 W CHAPTER 6 FUNCTION OF IMPORTANT COMPONENTS 1 DOOR OPEN MECHANISM The door can be opened by pulling the door handle When the door handle is pulled the latch head is moved upward and released from the latch hook now the door can be opened Latch hook SW2 Stop switch SW3 Monitor switch SW1 Monitored latch switch Figure D 1 Door Open Mechanism 2 MONITORED LATCH SWITCH SW1 1 When the oven door is closed the contacts COM NO of the switch must be closed And the contacts COMNC must be opened When the oven door is opened the contacts COMNO of the switch must be opened And the contacts COM NC must be closed 3 STOP SWITCH SW2 1 When the oven door is closed the con
98. voltage transformer because the primary coil thermal cut out has opened An open primary coil thermal cut out indicates overheating of the high voltage transformer Check for restricted air flow to the high voltage transformer especially the ventilation opening 4 CARRY OUT 4R CHECKS 3 Procedure C HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS Isolate the high voltage rectifier assembly from the circuit The high voltage rectifier can be tested using an ohmmeter set to its highest range Connect the ohmmeter across the terminal B C of the high voltage rectifier and note the reading obtained Reverse the meter leads and note this second reading The normal resistance is infinite in one direction and more than 100 in the other direction CARRY OUT 4R CHECKS ASYMMETRIC RECTIFIER TEST CARRY OUT 3D CHECKS ASYMMETRIC Isolate the high voltage rectifier assembly from the HV circuit The asymmetric rectifier can be REIER y HIGH VOLTAGE tested using an ohmmeter set to its highest range across the terminals A B of the asymmetric RECTIFIER rectifier and note the reading obtained Reverse the meter leads and note this second reading If an open circuit is indicated in both directions then the asymmetric rectifier is good If the asymmetric rectifier is shorted in either direction then the asymmetric rectifier is faulty and must be replaced with high voltage rectifier When the asymmetric rectifier is defective check whethe
99. ws holding the jog and switch unit to the control panel 11 Remove the jog and switch unit from the control panel 12 Now the jog and switch unit is free CAUTION Make sure that no swarf from the rotor enters the gap between the rotor amp stator of the fan motor Avoid touch the coil of the fan motor with the pliers as the coil may become cut or damaged Avoid deforming the bracket whilst using the pliers ii Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand iii Now the fan blade is free CAUTION Do not re use the removed fan blade as the fixing hole may be oversize 11 Remove the two 2 screws holding the fan motor to the fan duct 12 Now the fan motor is free 2 INSTALLATION 1 Install the fan motor to the fan duct with the two 2 screws and nuts 2 Install the fan blade to the fan motor shaft according to the following procedure Hold the centre of the bracket which supports the shaft of the fan motor on a flat table Apply the screw lock tight into the hole for shaft of the fan blade iii Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet CAUTION Do not hit the fan blade when installing because the bracket may be deformed Coi Groove joint pliers
100. y 1 Resistance of heater Disconnect the wire leads to the heating element to be tested Using ohmmeter with low resistance range Check the resistance across the termi nals of the heating element as described in the following table Table Resistance of heater Parts name Resistance Grill heating elements GH Top Approximately 37 4 Q 39 70 18 70 19 850 x 2 Convection heating elements CH Approximately 34 09 36 720 2 Insulation resistance Disconnect the wire leads to the heating element to be tested Check the insulation resistance between the element terminal and cavity using a 500V 100 insulation tester The insulation resistance should be more than 10 MA in the cold start If the results of above test 1 and or 2 are out of above specifications the heating element is probably faulty and should be replaced CARRY OUT 4R CHECKS 13 Procedure M CONTROL PANEL ASSEMBLY TEST The control panel consists of circuits including semiconductors such as LSI ICs etc Therefore unlike conventional microwave ovens proper main tenance can not be performed with only a voltmeter and ohmmeter In this service manual the control panel assembly is divided into two units Control Unit and Jog and Switch Unit and also the control unit is divided into two units CPU unit and Power unit and troubleshooting by replacement is described according to the symptoms indicated 1 Jog and Switch Unit Note Check Jog a

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