Sharp R-3A55 Service Manual Download Page 33 | Manualshive

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Summary of Contents for R-3A55

Page 1: ...L IMPORTANT INFORMATiON I WARNING 1 RODUCT SPECIFICATIONS 2 APPEARANCE VIEW 3 OPERATING SEQUENCE FUNCTION OF IMPORTANT COMPONENTS TRABLESHOOTING CHART 7 TEST PROCEDURE 9 TOUCH CONTROL PANEL 16 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 21 MICROWAVE MEASUREMENT 26 WIRING DIAGRAM 27 PICTORIAL DIAGRAM 2 8 CONTROL PANEL CIRCUIT 29 PRINTED WIRING BOAD 30 PARTS LIST 31 SHARP CORPORATION ...

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Page 3: ... andgaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide 7 I I I I I J WARNING 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 visi...

Page 4: ... secinds Microwave Power for Variable Cooking Repetition Rate HIGH Full power throughout the cooking time MEDIUM HIGH approx 70 of Full Power MEDIUM approx 50 of Full Power MEDIUM LOW approx 30 of Full Power LOW approx 10 of Full Power INSTANT ACTION 8 menu AUTO COOK pad EASY DEFROST NUMBER pads POWER LEVEL pad MORE LESS pads STOP CLEAR pad AUTO START CLOCK pad INSTANT COOK START pad A a 4P I nuur...

Page 5: ...Power supply cord 13 Rating label DISPLAY I REtiEAT 3E ROST MED LOW rflGc j 1Km I r l I I TI x I x I QiJ ldrcator VA AUTO Kg COOK t TOUCH CONTROL PANEL INSTANTACTiONPADS pCpdiTMU AUTOCOOKMENUS ww 3Jacket potato 4RoastLamb 5cornedMeat z3 or4 SERVE OuANTTlY PAD Toaxktw three orfourse es AUTO press padprior pressing COOK ltlf2InslarltAdionpad N PADS Presstoentercooldhgtines dod tine weigMofquantih of...

Page 6: ...3 volts A C output on the filament winding and high voltage of approximately 2000 volts A C on the secon dary winding The filament winding voltage 3 3 volts heats the mag netron filament and the high voltage 2000 volts is sent to the voltage doubling circuit where it is doubled to negative voltage of approximately 4000 volts D C The 2450 MHz microwave energy produced in the magnetron generates a w...

Page 7: ...R The rated peak reverse voltage of DI of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1 7 KV Dl and D2 of the asymmet ric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage The process of blowing the fuse MSA 1 The high voitage rectifier is shorted by any causes ...

Page 8: ...l cut out protect the fan motor against over heating If its temperature goes up higher than 95 C be cause the fan motor is locked or the ventilation operating are blocked the contacts of the thermal cut out will open and switch off the oven When the oven cools itself down to 7523 the contacts of the thermal cut out will close again TURNTABLE MOTOR The turntable motor drives the turntable roller as...

Page 9: ...some cases be necessary to connect the supply after the outer case has been removed in this event carry out 30 checks and then disconnect the leads to the primary of the power transformer Ensure that these leads remain isolated from other components and the oven chassis Use insulation tape if necessary When the testing is completed carry out 3tJ checks and reconnect the leads to the primary of the...

Page 10: ...le 88 88 does not appear in drs FF ONDITION Display does not ooeratt properly when STOPICLEAF I pad IS touched 1Oven iamp does not irah a I pears ooor ooeped iDlsp aG ap siay a npeaf s i Sver 12 5 does noi r gnr DIS p av 293ears i Far mote aoes not ooeiate 3 s la 223e2rs ir Yp 25iE more assem3ly aoes nc zoerate Zsp ah ap Gears I Over or any erectncai parts aoes no stop when cookrng time 1s0 c STOP...

Page 11: ...g this microwave heating period the calorie of thewater is V x IT The formula is as follows I Pxti4 187 Vx_l T P W 4 l87xVxAT t 1 Our condition for the water load is as follows I Room temperature around 20 C Power supply Voltage I 1 Water load 1000 g Rated voltage Initial temperature 10 2 C Heating time I 49 sec j P 85 x IT Measuring condition 1 Container The water container must be a cylindrical ...

Page 12: ...ad 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 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 formulae is as follows P 8330xAT t Our condition for the water load is as follows Room temperature 23 2...

Page 13: ...nts are present at the secondary winding and fila 1 ment winding of the power transformer It is very dangerous to work near this 1 part when the oven is on NEVER make any voltage measurements at the high voltage circuits including the magnetron filament CARRY OUT 3D CHECKS Disconnect the leads to the primary winding of the power transformer Disconnect the filament and secondary winding connections...

Page 14: ...f the measuring instrument must have a voltage at least 6 volts because otherwise an infinite resistance might be shown in both directions D HIGH VOLTAGE CAPACITOR TEST CARRY OUT m CHECKS A Isolate the high voltage capacitor from the circuit 3 Continuity check must be carried out with measuring instrument which is set to the highest resis tance range C A normal capacitor shows continuity for a sho...

Page 15: ...r HV 3 1rzziT An open circuit thermal cut out 145 C OVEN indicates that the foods in the oven may catcn fire ths may be due to over heating produced by improper setting of the cooking time or faiiure of the contrc panel An open circuit thermal cut out 95 C FAN indicates that the fan motor Jvinding has overheated this may be due to blocked ventilation or locked cooling fan G MONITOR RESISTOR TEST C...

Page 16: ...ith only a voltmeter and ohmmeter In this service manual the touch control panel assembly is divided into two units Control Unit and Key Unit and troubleshooting by replacement is described according to the symp toms indicated 1 Key Unit The following y p s m toms indicate a defective key unit Replace the key unit aj When touching the pads a certain pad produces no signal at all b When touching a ...

Page 17: ...ith a fine foil pattern added to the primary 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 30 CHECKS STEPS j OCCURANCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at Check supply voltage and oven power cord POWER terminal of CPU connector CN A The r...

Page 18: ...oltage Application VC 5v LSI IC1 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock cir cuit It accompanies a very small error because it works on commercial frequency 4 ACL Circuit A circuit to generate a signals which resets the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzzer is resp...

Page 19: ...c2 OUT Internal ciock oscillation frequencv input settinq The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to OSCl terminal Internal clock oscillation frequencv control output Output to control oscillation input of OSC2 10 l 1 GND Avss IN IN Connected to VC 12 j AN0 OUT Oven lampturntable motor and coolinq fan motor drivinq siqnal Square Wave j f...

Page 20: ...he touch control panel circuit for the relationship between signals and indica tors Normally one pulse is output in every synchronized signal period and input to the anode of the fluorescent display R8c 1 OUT Seqment data siqnal Refer to the touch control panel circuit for the relationship between signals and indica tors Normally one pulse is output in every synchronized signal period and input to...

Page 21: ...lied to touch key section A pulse signal is input to ROo ROs terminal whiie one of G4 line keys on key matrix is touched OUT Seqment data siqnal Signal similar to 08 Kev strobe siqnal Signal applied to touch key section A pulse signa one of G3 line keys on key matrix is touched I is input to ROo ROs terminai whiie OUT Seament data siqnal Signal similar to 08 Kev strobe siqnal Signal applied to tou...

Page 22: ...ouch 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 do...

Page 23: ...SCHARGE HIGH VOLTAGE CAPACI from retaining clips on the cavity face plate TOR BEFORE TOUCHING ANY OVEN Lift the entire case from the oven COMPONENTS OR WIRING POWER TRANSFORMER REMOVAL CARRY OUT CHECKS Disconnect wire leads from power transformer magne tron and capacitor terminals Remove four 4 screws holding transformer to base plate right Remove transformer 6 Discharge the H V capacitor before c...

Page 24: ...touch the pliers to the coil of the fan motor because the coil may be cut or injured Do not transform the bracket by touching with the pliers 2 Remove the fan blade assembly from the shaft of the fan motor by pulling fan retainer clip and rotating the fan blade with your hand 3 Now the fan blade will be free CAUTION Do not use this removed fan blade again Because the hole for shaft of it may becom...

Page 25: ...rocedure 1ST LATCH SWITCH 2ND LATCH SWITCH AND MONITOR SWITCH ADJUSTMEPIT If the 1st latch switch 2nd latch switch stop switch and monitor switch do not operate properly due to a misadjust ment the following adjustment should be made 1 Loosen the two 2 screws holding latch hook to the oven cavity front flange 2 With door closed adjust latch hook by moving it back and forth and up and down In and o...

Page 26: ...nge to the top of the oven cavity Note After any service to the door A Make sure that door sensing switch and secon dary interlock switch are operating properly Re fer to chapter Test Procedures B An approved microwave survey meter should be used to assure compliance with proper micro wave radiation emission limitation standards After adjustment make sure of the following 1 Door latch heads smooth...

Page 27: ...l are provided at 18 places do not force any particular part 2 Insert an putty knife thickness of about 0 5mm into the gap between the choke cover and corner portion of door panel as shown Figure C 4 to free engaging parts 3 Lift up choke cover 4 Now choke cover is free from door panel 5 Remove four 4 screws holding the door flame to the gutter for choke cover 6 Remove the door flame with pulling ...

Page 28: ... microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M 2 Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water initially at 20 5 C in the center of the oven tray The water container should be a low form of 600 ml beaker with inside di ameter of approx 8 5cm and made of an electrically non conductive material...

Page 29: ...r 4 L I 5 J I 6 L r r 0 u a I 7 I I g Ea g 3 2 e O l Oven Schematic OFF Condition yF 7 z2 _ T L I I i 4 48 ST e It T c_r 7 o _ V _ _ E 5 I_ TJT 8 I 5 8 az L 0 13 2 I z E h 5 2 5 I I an OO r b3 z 8 2 Figure O 2 Oven Schematic Cooking Condition 27 ...

Page 30: ...I 1 2 3 4 5 6 I E Q r m n Yi it G CI u n c IF H ...

Page 31: ... 7 J i I I i _ 1 di1 fy I j i 1 1 1 I Ii 7 i co L J j111 II I 0 P 5 FT zz AOSiril O 13 i23iJ E i MP Olki ii zr 1 A id iF 1 jw p 0 is s 2 2 siz f v c c j pci w w iihriI GGG if it ew v mrJY I IoI l I IIit I 535 LL u LL c I I I 4 I j i I i I Cd i s 33 pz 5 0 P 62 au J tg C T b 1 2 I 3 4 5 I 6 29 I CI z 6 z ii e 0 E 2 5 0 cy cn ii 5 c ts C E I F I I I tc ...

Page 32: ...1 2 4 5 6 3A55 I I I t Bi I I I i t E F Gi I I I t I Hi J 3 s 1 4 S 2 CI 6 t 6 Figure S 3 Printed Wiring Boad I 1 2 3 4 5 6 30 ...

Page 33: ... 3l H 04M c21 VCEm31 W4 5M c30 VCKYDllCY103N CFl RCRS A012DREO CR50 Ceramic resonator CST4 00MGW RMPTEAOllDREO CR array Dl D20 21 D23 RSRCDA013DREO VHDlSS27OA 1 VHDlSS270A 1 D30 VHDlSS27OA 1 D50 57 VHDlSS27OA 1 ICl RH IZA496DREO Ql VS2SA933S 3 Q20 VSDTA114ES 3 Q21 VSDTD143ES 3 Q22 VSDTB143ES 3 VRD B12HF202J VRD B12HF681J VRS B13AA102J Rll 1 VRD B12EF56 i R20 VRD Bl2EF471 R30 VRD B12EF33lJ R31 I VR...

Page 34: ...unting angle Fan blade Fan duct Oven cavity Bottom piate R assembly Bottom plate L Foot Clhassissupport Partition angle ver hinge Upper 3ver hinge Lower Switch lever 2oupl kg T drnzablemotor cox er z T rr 1 2 Lu cie cover 2LS FliOI l c 1r aAeA q 1A dLA AUil 2 A g 2 de I T o mr Cd L__ CL _w _ L Z Sr_iJr T z zaLle otor pzekng I 0 i L r ve_v _ 7 p S iCsl 1 4Q AL i A f 1 AK 1 AL i AQ 1 BE _1 2 AT L 1 ...

Page 35: ...1x 1 1 AA y 6 XVPSD40P20000 Screw 4mn 1 x 2Omm 1 AA 7 7 LX CZAO38WREO Special 1 AA screw 8 LX CZ0052wREG Special 2 AA screw 7 9 XFPSD30P06000 2 Screw 3rru n x 6rrn AA Lo XFPSD30PlOOOO Screw 3rrmx 1Omm 4 AA 7 1 LX CZA029WREO Special screw A 7 12 XFPSD40P08000 3 AA Screw 41 1 m x 8mm 7 13 XOTSD40P12RI 70 4 Screw 4 m x 12rm AA i A AA HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly a...

Page 36: ...R 3A55 1 2 3 4 I 5 I 6 1 I 2 3 I 4 I 5 6 34 1 ...

Page 37: ...1 I 2 3 I 4 I 5 1 6 CONTROL PANEL PARTS I I I I A0 4 J o VI 1 2 I 3 4 5 6 35 1 I I I it I I I iH I 1 IA 1 I i i 1 1 1 I j I I I ...

Page 38: ...illustration PACKiNG AND ACCESSORIES TURNTABLE TRAY 0 DOOR PROTECTION SHEET e SPADPA204WREO OPERATION MANUAL COOK BOOK t cx TURNTABLE SUPPORT 3 e POLYETHYLENG BAG SSAKHA034WREO 0 TRAY PACK SPADFA257WREO 0 PACKING PAD KIT CPADBAICZWRKO MICROWAVE OV DOOR PAD SPADFAO61 WREO Not Replaceable Items 1 1 2 I 3 I 4 5 6 36 ...

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Page 40: ...SHARP 93 SHARP CORP 07K0 75E Printed tn Austraha 38 ...

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