Sharp R-7A55 Service Manual Download Page 48

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R-7A55(W)/(B)
R-7E45(W)/(B)

'93 SHARP CORP. (12

S1.31E) Printed in Germany

Summary of Contents for R-7A55

Page 1: ...ROCEDURE 12 TOUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 25 MICROWAVE MEASUREMENT 30 TEST DATA AT A GLANCE 31 WIRING DIAGRAM 32 PICTORIAL DIAGRAM 35 CONTROL PANEL CIRCUIT 36 PRINTED WIRING BOARD 38 PARTS LIST 39 In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used SY308R7A55EHW R 7A55 W...

Page 2: ...s sitä käytetään tai jos se kytketään väärin Kaikkien mikroaaltoliitäntöjen sekä syöttö että ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunnia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä ADVARSEL MIKROBØLGESTRÅLING Personell må ikke utsettes fo...

Page 3: ...losed B The door latches and hinges are not defective C The door is not deformed or warped D There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service engineers Note All the parts marked on the parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed WARNING Note The parts marked are use...

Page 4: ...8 mm Cooking Cavity Dimensions Width 342 mm Height 195 mm Depth 357 mm Turntable diameter 325mm Control Complement Touch Control System Microwave Cooking Control 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 POTATO keys R 7A55 only INSTANT ACTION keys R 7A...

Page 5: ... to confirm the oven is operating as de sired 1 MORE indicator 2 LESS indicator 3 CONVECTION indicator 4 GRILL indicator 5 LOW 6 MEDIUM LOW Microwave 7 MEDIUM power level 8 MEDIUM HIGH Indicators 9 HIGH 10 Digital display 11 Units of weight indicator 12 Cook indicator This indicator shows cooking in progress OPERATING KEY 13 POTATO keys 14 INSTANT ACTION keys 15 MORE LESS keys 16 Time keys 17 MINU...

Page 6: ...witch and monitor switch SW4 are made open The circuit to the fan motor is cut off when the relayRY6 is made open The circuit to the turntable motor is cut off when the contacts COM NO of the 2nd latch switch are made open The relay RY2 and RY6 are made open when the door is opened The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted because the rel...

Page 7: ...s the convection heater element is also activated Program desired cooking time and grill mode by touching TIME keys and GRILL key When the START key is touched the following operations occur 1 The numbers of the digital readout start the count down to zero 2 The oven lamp cooling fan motor turntable motor and convection motor are energized 3 The relay RY5 is energized and the grill heating element...

Page 8: ...cts open due to their being normally open contact switches 2 As the door goes to a closed position the monitor switch SW3contacts COM NC areopenedandcontacts COM NO closed and 2nd latch switchSW2 contacts COM NO are closed and then the 1st latch switch and stop switch contacts close On opening the door each of these switches operate inversely 3 If the door is opened and the 1st latch switch SW1 co...

Page 9: ...and is located on the top of the oven cavity CONVECTION HEATING ELEMENT CH The convection heating element is located 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 convection heating element CONVECTION COOKING SYSTEM This oven is designed with a hot air heating system where food is n...

Page 10: ...cooking shut off relay RY7 is energized and the damper is returned to the open position NOTE If the damper door is not in the proper position closed durining convection grill or dual or open durning microwave the control unit will stop oven operation after 1 minute Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Grill cooking CLOSE Dual cooking CLOSE SENSING FIRE O...

Page 11: ...r for two 2 minutes And set the power level to HIGH 100 and push the start key 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 REMEMBER TO CHECK 3D 1 Disconnect the supply 2 Door opened and wedged open 3 Discharge high voltage capacitor WARNING AGAINST...

Page 12: ...oes not seem to be operating properly during variable cooking condition Oven operates properly at HIGH Oven goes into cook cycle but shuts down before end of cooking cycle Convection heating element does not heat Oven seems to be operate when the temperature in the oven cavity is lower or higher than preset one Grill heating element does not heat Convection heating element does not stop when the t...

Page 13: ...TING ELEMENT CONVECTION HEATING ELEMENT THERMISTOR POWER SUPPLY CORD SHORTED WIRE HARNESS OPENED WIRE HARNESS OVEN LAMP OR SOCKET TC TRANSFORMER TOUCH CONTROL PANEL BLOCKED VENTILATION OPENINGS WRONG OPERATION MIS ADJUSTMENT OF SWITCHES HOME FUSE OR BREAKER NO POWER AT WALL OUTLET BLOCKED CONVECTION FAN BLOCKED COOLING FAN RELAY RY1 2 3 4 5 7 FOIL PATTERN ...

Page 14: ...ltage Rated voltage Water load 1000 g Initial temperature 10 2 C Heating time 42 sec P 100x T NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION TEST PROCEDURES PROCEDURE LETTER A MAGNETRON TEST Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an ou...

Page 15: ...tained Reverse the meter leads and note this second reading The normal resistance is infinite in one direction and more than 100 kΩ in the other direction CARRY OUT 4R CHECKS ASYMMETRIC RECTIFIER TEST CARRY OUT 3D CHECKS CARRY OUT 3D CHECKS 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 c...

Page 16: ...uring instrument which is set to the highest resistance range C A normal capacitor shows continuity for a short time kick and then a resistance of about 10MΩ after it has been charged D A short circuited capacitor shows continuity all the time E An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance F When the internal wire is opened in the high voltage...

Page 17: ...perature is approx 20 C Thermal cut out This is not resetable Above 170 C Closed circuit 170 C TC1 type Thermal cut out This is not resetable Above 125 C Closed circuit 125 C TC2 type Thermal cut out Below 170 C Above 190 C Closed circuit 190 C TC3 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 descri...

Page 18: ...be shorts in 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 Only replace fuse F3 F10A with the correct value replacement M CONVECTION HEATING ELEMEN...

Page 19: ...s a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 In connection with indicators a At a certain digit all or some segments do not light up b At a certain digit brightness is low c Only one indicator does not light d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of i...

Page 20: ...not check oven circuit Relay Test Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation convection cooking operation or grill cooking 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 Approx...

Page 21: ...n power cord 2 The rated AC voltage is present at primary side of low voltage transformer Low voltage transformer or secondary circuit defective Check and repair 3 Only pattern at a is broken Insert jumper wire J1 and solder CARRY OUT 3D CHECKS BEFORE REPAIR 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d CARRY OUT 3D CHECKS BEFORE REPAIR CARRY OUT 3D CHECKS NOTE At t...

Page 22: ... Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit 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 responsive to signals from the LSI to emit noticing sounds k...

Page 23: ... 9 R01 OUT Grill heating element driving signal To turn on and off the grill heating element relay RY5 L level during grill or dual cooking H level otherwise 10 R02 OUT Timing signal output terminal for temperature measurement OVEN H level GND Temperature measuring timing Convection cooking or dual cooking L level 5V Thermistor OPEN timing 11 R03 IN Input signal which communicates the damper open ...

Page 24: ...und 2 4sec 38 D4 OUT Cooling fan motor driving signal To turn on and off shut off relay RY6 H level during both microwave Grill and convection cooking L level otherwise 39 D5 OUT Damper motor relay driving signal To turn on and off shut off relay RY7 40 45 D6 D11 OUT Digit selection signal The relationship between digit signal and digit are as follows Digit signal Digit D6 1st D7 2nd D8 3rd D9 4th...

Page 25: ...l while one of G 7 line keys on key matrix is touched 55 R93 OUT Segment data signal Signal similar to D12 Key strobe signal Signal applied to touch key section A pulse signal is input to R20 R23 terminal while one of G 8 line keys on key matrix is touched 56 59 R10 R13 OUT Segment data signal Signal similar to D12 60 R20 IN Signal coming from touch key When either one of G 9 line keys on key matr...

Page 26: ...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 terminals 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 1 Precautions for Hand...

Page 27: ... supply 2 Open the oven door and wedge it open 3 Remove the screws from rear and along the side edge of case 4 Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate 5 Lift the entire case from the oven CAUTION DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENT OR WIRING CONTROL PANEL REMOVAL 1 CARRY OUT 3D CHECKS 2 Disconnect the connectors ...

Page 28: ...he rotor is easy to be shaven by pliers and metal pieces may be produced Do not 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 Removethefanbladeassemblyfromtheshaftofthe fan motor by pulling and rotating the fan blade with your hand 3 Now the fan blade will be free CAUTION Do not use this removed fan b...

Page 29: ... holding the back plate to oven cavity 3 Disconnect the wire leads from the convection heating element convection motor and thermal cut out 4 Remove the three 3 screws holding the convection fan duct to the oven cavity from out side 5 Remove the six 6 screws holding the convection fan duct to the oven cavity 6 Now the convection fan duct is free CONVECTION HEATING ELEMENT 7 Remove the two 2 screws...

Page 30: ... has pushed the plungers of the monitor switch and 2nd latch switch with the door closed The vertical position of the latch hook should be placed where the latch head has pushed the plungers of the 1st latch switch and stop switch with the door closed and the start button pushed 4 Secure the screws with washers firmly 5 Make sure of the all switches operation If the latch head has not pushed the p...

Page 31: ...d check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure DOOR REPLACEMENT AND ADJUSTMENT FigureC 7 DoorAssemblyReplacementand Adjustment RE INSTALL DOOR ASSEMBLY OUTER CASE CABINET LATCH HEADS SCREWS CHOKE COVER REMOVAL 1 Insert an iron plate thickness of about 0 5mm or flat type screw driver to the gap between the choke cover a...

Page 32: ...d for 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 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 mate...

Page 33: ...lament winding 1Ω Secondary winding Approx 81 7Ω Primary winding Approx 1 22Ω Resistance Disconnect the In Out put terminal Test Point Volt power and door is closed Input terminal Power supply A1 A3 220 230V Approx 480 Ω Input terminal Stop switch B1 B2 0 Input terminal Thermistor B5 B6 DC 5V Approx 69 kΩ at 20 C 30 C Output terminal Grill heating element N O of RY5 A1 220 230V Approx 170 Ω Output...

Page 34: ...ITOR 1 2µ AC2100V H V RECTIFIER MG MAGNETRON OL L N CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENT DM DAMPER MOTOR H5 H6 H7 H8 A3 H3 H1 B2 B1 B3 B4 B6 B5 A5 A7 A9 COM COM COM N O N O N O RY3 RY5 RY1 RY4 RY6 RY7 SW5 DAMPER SWITCH THER MISTOR RY2 NOISE FILTER SW4 MONITOR SWITCH SW1 1ST LATCH SWITCH A1 220 230V 50Hz BLU 15 BRN 15 G Y 15 EARTH 0 22µ 250V F1 FUSE 15A NOISE SUPPRESSION COIL 10M ...

Page 35: ...SYMMETRIC RECTIFIER C CAPACITOR 1 2µ AC2100V H V RECTIFIER MG MAGNETRON OL L N CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENT DM DAMPER MOTOR H5 H6 H7 H8 A3 H3 H1 B2 B1 B3 B4 B6 B5 A5 A7 A9 COM COM COM N O N O N O RY3 RY5 RY1 RY4 RY6 RY7 SW5 DAMPER SWITCH THER MISTOR RY2 NOISE FILTER SW4 MONITOR SWITCH SW1 1ST LATCH SWITCH A1 220 230V 50Hz BLU 15 BRN 15 G Y 15 EARTH 0 22µ 250V F1 FUSE 15A ...

Page 36: ...VECTION FAN MOTOR F2 FUSE F6 3A SW3 STOP SWITCH T HIGH VOLTAGE TRANSFORMER ASYMMETRIC RECTIFIER C CAPACITOR 1 2µ AC2100V H V RECTIFIER MG MAGNETRON OL L N CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENT DM DAMPER MOTOR H5 H6 H7 H8 A3 H3 H1 B2 B1 B3 B4 B6 B5 A5 A7 A9 COM COM COM N O N O N O RY3 RY5 RY1 RY4 RY6 RY7 SW5 DAMPER SWITCH THER MISTOR RY2 A1 220 230V 50Hz BLU 15 BRN 15 G Y 15 EARTH ...

Page 37: ...ECTIFIER T HIGH VOLTAGE TRANSFORMER G Y BLU BRN F1 FUSE 15A NOISE FILTER POWER SUPPLY CORD F2 FUSE F6 3A BRN BLK RED BRN 6 5 GRN 4 RED 3 2 1 COM BLU WHT WHT GRN BRN ORG CN B NO SW2 2ND LATCH SWITCH SW3 STOP SWITCH NO COM NC COM SW4 MONITOR SWITCH SW1 1ST LATCH SWITCH NO COM GH GRILL HEATING ELEMENT RED WHT CAPACITOR RED BLU W H T R E D R E D BRN BRN BLU BLU COM THERMISTOR BRN BRN BRN WHT WHT ORG G...

Page 38: ...5V R1 S2 P T1 4 3K 1 2W ZD1 HZ6A 3 R2 1K 1 2W Vdisp R3 1 2K 1 2W C3 47µ 16V C4 ZD2 HZ4C 3 R4 1K Q1 2SA933S R5 15K C5 R10 47K R11 56K C10 0 01µ 50V C21 4 7µ 35V C20 0 1µ 50V Q20 DTA114ES R20 470 Q21 DTD143EA Q22 Q23 Q24 Q25 Q26 Q27 R93 1 5K ZD3 HZ20 2 Q2 2SB 910M C90 47µ 35V D1 S1NB10 VRS1 a b c d RY1 RY2 RY3 RY4 RY5 RY6 RY7 D20 D21 D22 D23 D24 D25 D26 R94 120 1W R96 100 1W R97 100 1W J3 J5 J7 J2 J...

Page 39: ...5V R1 S2 P T1 4 3K 1 2W ZD1 HZ6A 3 R2 1K 1 2W Vdisp R3 1 2K 1 2W C3 47µ 16V C4 ZD2 HZ4C 3 R4 1K Q1 2SA933S R5 15K C5 R10 47K R11 56K C10 0 01µ 50V C21 4 7µ 35V C20 0 1µ 50V Q20 DTA114ES R20 470 Q21 DTD143EA Q22 Q23 Q24 Q25 Q26 Q27 R93 1 5K ZD3 HZ20 2 Q2 2SB 910M C90 47µ 35V D1 S1NB10 VRS1 a b c d RY1 RY2 RY3 RY4 RY5 RY6 RY7 D20 D21 D22 D23 D24 D25 D26 R94 120 1W R96 100 1W R97 100 1W J3 J5 J7 J2 J...

Page 40: ... R94 ZD1 D20 S1 P CN H S2 8 1 2 3 4 5 6 7 8 HZ RLY OVEN TH DAMP SW DOOR SW CN B 15 C91 D28 J5 J3 D40 17 16 R3 14 J4 13 E B R1 C2 C1 D1 R10 R11 F1 J8 C10 R30 SP30 R31 1 10 12 1 CN G CR70 6 c77 c76 c75 c74 c73 c72 c 71 c 70 B Q27 B Q26 2 1 33 35 40 45 50 55 60 64 32 30 25 20 15 10 5 1 7 8 IC 1 B Q60 E J1 R92 R62 R100 ZD4 R2 Q3 C40 12 11 R16 10 R40 R50 C60 R60 C50 R51 J6 J6 J7 J8 Q90 B E D90 R98 C3 C...

Page 41: ...hite 1 AX 2 4 MHNG A325WRM0 U Lower oven hinge 1 AC 2 5 GDAI A219WRP2 U Base plate 1 AS 2 6 GLEGPA028WRE0 U Foot 4 AA CONTROL PANEL PARTS 3 1 CPWBFA564WRK0 J Control unit 1 BT 3 1A QCNCMA227DRE0 J 9 pin connector A 1 AC 3 1B QCNCMA267DRE0 J 6 pin connector B 1 AC 3 1C QCNCWA030DRE0 J 12 pin connector G 1 AE 3 1D QCNCMA346DRE0 J 6 pin connector H 1 AK 3 1E RV KXA058DRE0 J Fluorescent display tube 1...

Page 42: ...0 J Buzzer PKM22EPT THAI 1 AG VRS1 RH VZA010DRE0 J Varistor 15G471K T 1 AE ZD1 VHEHZ6A3 1 J Zener diode HZ6A3 1 AA ZD2 VHEHZ4C3 1 J Zener diode HZ4C 3 1 AA ZD3 VHEHZ202 1 J Zener diode HZ20 2 1 AB 3 2 DUNTKA579WRK0 J Key unit assembly R 7A55 B 1 BB 3 2 DUNTKA580WRK0 J Key unit assembly R 7A55 W 1 BB 3 2 DUNTKA577WRK0 J Key unit assembly R 7E45 B 1 BB 3 2 DUNTKA578WRK0 J Key unit assembly R 7E45 W ...

Page 43: ...U High voltage wire A 1 AE 6 7 QW QZA176WRE0 U High voltage wire B 1 AE 6 8 FW VZB279WRE0 U Main harnes 1 BB 6 9 TLABSA055WRR0 U Fuse label 1 AB 6 10 TINS A412WRR0 U Operation manual for R 7A55 B W 1 AH 6 10 TINS A411WRR0 U Operation manual for R 7E45 B W 1 AH 6 12 TSPCNB921WRR0 U Rating label 1 AH 6 13 TCADCA500WRR0 U Cook book 1 AQ 6 14 TLABMA372WRR0 U Menu label for R 7A55 W only 1 AG 6 14 TLAB...

Page 44: ...lease furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION 7 24 LX EZA004WRE0 U Special screw 5 AA Note The parts marked may cause undue microwave exposure The parts marked are used in voltage more than 250V Mark Spare parts delivery section REF NO PART NO DESCRIPTION Q TY CODE ...

Page 45: ... F2 7 1 7 16 1 3 4 18 6 9 F1 7 6 7 17 4 6 TC2 7 16 7 20 7 6 7 20 4 26 R1 1 6 F3 7 12 7 13 7 9 4 19 7 16 1 7 OL TC1 7 17 7 24 7 16 7 21 7 5 7 20 4 21 7 7 4 25 4 23 4 37 4 20 7 18 TTM 7 18 4 29 4 22 4 4 4 1 4 27 4 17 2 5 7 19 4 31 7 3 4 28 T 4 32 2 4 7 24 2 6 7 20 7 20 7 20 7 20 4 35 6 4 4 34 6 3 7 15 4 24 MG 4 15 4 14 SW2 SW3 SW4 SW1 7 20 1 3 4 16 FM 7 14 C 4 2 1 4 7 6 x2 x6 x2 x3 x4 x4 x2 7 16 2 1...

Page 46: ...44 R 7A55 W B R 7E45 W B 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H DOOR PARTS CONTROL PANEL PARTS 3 5 3 6 3 8 3 7 3 1 3 2 3 3 3 4 5 3 5 5 1 5 8 5 6 5 7 5 7 5 7 5 4 5 5 5 2 ...

Page 47: ...COOK BOOK COVER SSAKHA045WRE0 COOK BOOK INSTRUCTION BOOK ROLLER STAY TRAY PAD SPADPA474WRE0 TOP PAD ASSEMBLY FPADBA272WRK0 BOTTOM PAD ASSEMBLY FPADBA273WRK0 WRAP COVER SSAKHA044WRE0 DOOR PROTECTION SHEET SPADPA468WRE0 PACKING CASE SPAKCC251WRR0 R 7A55 B SPAKCC255WRR0 R 7A55 W SPAKCC250WRR0 R 7E45 B SPAKCC254WRR0 R 7E45 W Not Replaceable Items 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H...

Page 48: ...46 R 7A55 W B R 7E45 W B 93 SHARP CORP 12S1 31E Printed in Germany ...

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