Sharp E52 Service Manual Download Page 1

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Summary of Contents for E52

Page 1: ...NFORMATION Page 1 CAUTION MICROWAVE RADlATION WARNING PRODUCT SPECIFICATIONS 1 APPEARANCE VIEW 2 OPERATION SEQUENCE 3 FUNCTION OF IMPORTANT COMPONENTS 4 SERVICING 5 TEST PROCEDURE 7 TOUCH CONTROL ASSEMBLY 10 COMPONENT REPLACEMENT AN J USTM ENT PR O E UR E IIII I I IIIII Il 17 MICROWAVE MEASUREMENT 23 TEST DATA AT A GLANCE 30 WIRING DIAGRAM 31 PICTORIAL DIAGRAM 32 CONTROL PANEL CIRCUIT 34 PRINTED W...

Page 2: ... 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 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...

Page 3: ... Width 381 mm 1 Height 210 mm Depth 411 mm 360mm Touch Control System Clock 1 OO 12 59 Timer 0 99 minutes 99 seconds 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 For R 4A52 For R 4E52 AUTO COOK INSTANT ACTION EASY REHE...

Page 4: ...me in one mcnute mcre ments during cookmg or to increase decrease the trme whrlst programmrng the Easy Reheat Auto Cook or Easy Defrost modes INSTANT COOK START PAD Touch once to cook for 1 mmute at HIGH or Increase by 1 mrnute multrples each trme this pad IS touched during cookmg Touch to start oven after settmg programmes Place the roller stay on the coupling in the oven and seat the turntable o...

Page 5: ...food is placed to be cooked 4 When the cooking time is up a signal tone is heard and the relays RYI RY2 go back to their home position The circuits to the oven lamp power transformer fan motor and turntable motor are cut off When the door is opened during a cook cycle the switches come to the following condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOKING Upper latch switch COM NO...

Page 6: ... STOP SWITCH SW4 1 When the oven door is closed the contacts COM NO must be closed 2 When the oven door is opened the contacts COM NO must be opened M ONITOR SWITCH SW3 1 When the oven door is closed the contacts COM NC must be opened 2 When the oven door is opened the contacts COM NC must be closed 3 If the oven door is opened and the contacts COM NO of the upper and lower latch switches SW1 SW2 ...

Page 7: ...ods It is then exhausted through the exhausting air vents at the oven cavity ASYMMETRIC RECTIFIER The asymmetric rectifier is a solid state device that prevents current flow in both directions And it pre vents the temperature rise of the power transformer by blowing the fuse E M8A when the high voltage rectifier is shorted qlG VOLTAGE RECTIF ER The rated peak reverse voltage of Dl of the asymmetri...

Page 8: ...water is now hot If the water remains cold carry out 3D checks and re examine Sharp recommend that wherever possible the connections to the component being tested faultifinding is carried out with the supply discon netted It may in 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 pnmary of the...

Page 9: ...uched Oven lamp does not light at door opened Display appears Oven does not start when START pad is touched Display appears 0 0 Oven lamp does not light Display appears Fan motor does not operate Display appears 0 Turntable motor assembly does not operate Display apears 0 Oven or any electrical parts does not stop But cooking time is 0 or STOP CLEAR pad is touched IN ONDITION Oven seems to be oper...

Page 10: ...R 4A52 R 4E52 I I z s 2 I E r t Z 2 0 z Y o_ u 0 7 5 9 I 2 22 23 F 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...

Page 11: ...s used When P W heating works for t second approximately P x t 4 2 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 1 The formulae is as follows I P x t 4 2 V x AT P W 4 2 x V x AT t Our condition for the water load is as follows Room temperature around 2O C Power supply Voltage 240 v...

Page 12: ...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 circuits including the magnetron filament CARRY OUT D CHECKS Disconnect the leads to the primary winding of the power transformer Disconnect the filament and secondary winding connec...

Page 13: ...is probably faultly and must be replaced with the high voltage rectifier When the asymmetric rectifier is defective check whether magnetron high voltage rectifier high voltage wire or fila ment winding of the power transformer is shorted CARRY OUT 4R CHECKS z H OLTAOE RECT F ER C NOTE FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLYAGE A...

Page 14: ... leads from the terminal of the noise filter WHT N 0 g Q Using an ohmmeter check between the terminals as described in the following table L hinl Cx ZO CvtZmb 1 0 mti 0 066 lF 22OOpF MEASURING POINTS Between N and L INDICATION OF OHMMETEf2i 1 I Open circuit I I 1 Between terminal N and WHITE Short circuit I I 4 Between terminal L and RED Short circuit l If incorrect readings are obtained replace t...

Page 15: ...ncorrect readings are obtained replace the temp fuse or thermal cut out An open circuit temperature fuse MG indicates that the magnetron has overheated this may be due to resistricted ventilation cooling fan failure or a fault condition within the magnetron or HV circuit An open circuit thermal cut out OVEN indicates that the foods in the oven catch fire this may be due to over heating produced by...

Page 16: ...CARRY OUT 3D CHECKS Remove test meter leads 1O Reconnect the leads to the primary of the power transformer If a reading of the line voltage was obtained step 7 but the motor was not turning then it is faulty and should be replaced If the meter indicated that no supply was present then the wiring I to the motor should be checked for continuity K BLOWN FUSE F M8A CARRY OUT J CHECKS 1 If the fuse E M...

Page 17: ... not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 2 3 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible d Proper temperature measurement is not obtained PROCEDURES TO BE TAKEN WHEN THE FOI...

Page 18: ...plication VDD 12v LSI ICY ACL circuit VREF VP i V LSI ICI Fluorescent display tube Grid VF and anode voltage 3V P P F rrenent of fluorescent display VF VF to VF voltage Synchronizing Signal 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 5 6 7 8 ACL...

Page 19: ...ith commercial source frequency 50Hz This is the basic timing for time processing of LSI PIN NO 6 1 SIGNAL 1 CNVSS I I O 1 IN _ _______ Power source voltage input terminal Connected to GND PIN NO 7 10 1 SIGNAL FO F3 I I O 1 OUT Segment data signals Refer to the touch control panel circuit for the relationship between signals and indicators Normally one pulse is output in every synchronized signal ...

Page 20: ...ouch key section A pulse signal is input to K4 K7 terminal while one of D 3 line keys on key matrix is touched PIN NO 1 17 Seclment data siqnal 1 SIGNAL S6 I I O 1 OUT Signal similar to FO Kev strobe signal Signal applied to touch key section A pulse signal is input to K4 K7 terminal while one of D 2 line keys on key matrix is touched PIN NO j 18 1 SIGNAL j 57 I l O OUT ____ Senment data siqnal Si...

Page 21: ...ot cooking In other cooking modes MED HIGH MED MED LOW LOW the signal turns to H level and L level in repetition according to the power level PIN NO 33 I 1 SIGNAL 1 DO I I O 1 OUT en lamp turntable motor and coolinq fan motor drivinq siqnal Square Waveform 50Hzl To turn on and off the control relay The pulse signal 50Hz is delivered to the control relay driving circuit and cook relay control circu...

Page 22: ...nding signal will be input into K5 PIN NO 38 1 SIGNAL j K4 IN ___ Signal coming from touch key When either one of D l 2 line keys on key matrix is touched a corresponding signal will be input into K4 PIN NO 39 1 SIGNAL j K3 I I O IN _ Terminal not used PIN NO 40 SIGNAL j K2 I I O IN Input signal which communicates the do r open close information to LSI Door closed H level signal Door opened L leve...

Page 23: ...s recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC IOMHz type or more ad vanced model 3 Others Hand tools 5 Other Precautions For those models therefore check and repair all the controls with the sensor related ones included of the touch control panel while keeping it in contact with the oven proper B On some models on the other hand the p...

Page 24: ...d wedge it open free it from retaining clips on the cavity face plate 5 Lift the entire case from the oven moved 6 Discharge the HV capacitor before carring out any N B Step I 2 and 6 form the basis of the 3D checks further work CAUTION DISCHARGE 7 Do not operate the oven with the outer case re HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING HIGH VOLTAGE COMPONENTS REMOVAL HIG...

Page 25: ...URNTABLE MOTOR REMOVAL I Disconnect the oven from power supply 2 Remove the turntable motor cover by removing the two 2 screws 3 Disconnect the wire lead from turntable motor and remove the two 2 screws holding the turntable motor 4 Remove the O ring and washer from the turntable motor 5 Turntable motor is now free XFTSD40PlOOOO Figure C l NOTE The two 2 screws holding the turntable motor to the o...

Page 26: ...lamp socket Flat type screw dri Figure C 3 Oven lamp socket UPPER LATCH SWITCH LOWER LATCH SWITCH STOP SWITCH AND MONITOR SWITCH REMOVAL CARRY OUT 3D CHECKS Remove the air duct from the oven cavity Disconnect the main wire harness and switch har ness from the control panel Disconnect the leads from all switches Remove the two 2 screws holding the latch hook to the oven cavity Remove the latch hook...

Page 27: ...ve activated with the door closed LATCH The vertical position of the latch hook should be placed where the lower latch switch and upper latch switch have activated with the door closed 4 Secure the screws with washers firmly 5 Make sure of the upper latch switch stop switch lower latch switch and monitor switch operation If those switches have not activated with the door closed two 2 screws holdin...

Page 28: ...holes Refer to latch switch adjustments 2 Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 Omm 3 The door is positioned with its face depressed to ward the cavity face plate 4 Reinstall outer case and check for microwave leakage around the door with an approved micro wave survey meter Refer to Microwave Measure ment Procedure CABINET Figure C 6 Door As...

Page 29: ...e oven cavity 5 Remove the single 1 screw holding the cord anchorage to the oven cavity 6 Remove the power supply cord from the oven Re install 1 Insert the power supply cord into the cord anchorages 2 Connect the brown wire of the power supply cord to the fuse holder 3 Install the green yellow wire of the power supply cord to the oven cavity with the single 1 screw tightly 4 Make sure that the bl...

Page 30: ...e earth angle and tighten the screw holding the earth angle Tighten the single 1 screw holding the cord anchorages CARRY OUT Q CHECKS Note Step 5 above is important and it must be done after replacing power supply cord Procedure 1 Pushing the lever of positive lock connecotr 2 Pull down the connector from the terminal 3 Now the connector is free Note If the positive lock has a insulation sleeve fi...

Page 31: ...ard 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 I 5ml of water initially at 20f5 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 m...

Page 32: ...t 1n Filament chassis 00 ohm Filament winding 1R Secondary winding Approx 78 9n Primary winding Approx 1 42231 TEST POINTS ON CONTROL UNIT In Out put terminal Input SUPPlY input Stop switch Output Oven lamp Fan motor Turntable motor Output Power transformer Output Earth Resistance Test point Volt Disconnect the power plug and door is closed Al A3 240V Approx 9000 Bl B2 OR Al A5 240V 98Q Al A7 240V...

Page 33: ...BROWN BLU BLUE G Y GREEN AND YELLOW STRIPE lB SECTIONAL AREA OF 0 75mm2 MIN 5w2 SE SWITCH T POWER TRANSFOAMER n H V RECTIFIER MG MA Figure O 1 a Oven Schematic OFF Condition For Australia Model I SCHEMATIC YOTE CONDITION OF OVEN l DODR CLOSED 2 COOKING TIME PROGRAMMED 3 START KEY TOUCHED sw1 UPPER LATCH SWITCH F FUSE M0A SW2 LOWER LATCH SWITCH Figure O 2 a v Oven Schematic ON Condition For Austral...

Page 34: ...ECTIONAL AREA OF 0 75mm2 MIN 3 TC THERMAL CUT OUT 143 OVEN r 1 7 1 j_ qliikMGj I _ UPPER LATCH SWITH SWl UPPER LATCH SWITH SW2 LOWER LATCH SWITCH SW3 MONITOR R MONITOR SWITCH RESISTOR 0 w2ow SCHEMATIC NOTE CONDITION OF OVEN l OOOR CLOSED SW3 MONITOR R MONITOR SWITCH RESISTOA 0 w2ow l DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY 2 COOKING TIMED PROGRAMMED 3 START KEY TOUCHED I I I H V RECTIFIER H V RECTI...

Page 35: ... 1 1 I G I I lH j i A B C D E F G H 7 mfxz I 2 G 2 co N 9 PC 2 4 r 5 a z z z a 5 U 5 B n 1 5 5 ii 5 r CA i 5 U a 81 3fh 93 I I crm3 1 I i 1 1 i P H Y 4 pgg TIP 97 l 01 c P Q L I I I I I t 11 j 6 l E 4 I 9 iit v 0 w 5X 8 k 81 II kg 3EC gg 2 z W I 0 Z 1 2 I 3 4 5 6 34 ...

Page 36: ...ij 2 z 2 N s z z IA E ii ii n z E G iT s 7 c z is LL 1 9 I 9 42 A Y a3g ii WI Lo F z v 43 i I I I a L zcn ti 8 E z 8 I I gg 6 t E 3 Y x 2 8F s2 luJ E 6 I u om UW 8 iTI ifi 1 I L u P ru U d u Etu4Jal e J c f c o culc fEE I F z I I 1 2 3 4 5 6 35 ...

Page 37: ...R 4A52 R 4E52 1 I 2 3 4 I 5 I 6 u z z PBY 2 em PI Y x gg El XS B sz 07 z S r ZZZO d 5 6L c 4 1 2 3 4 I 5 6 iz 3 1 c k z t 6 I z ii t p L E 00lE Ij cdj 2 ii 1 LL F 1 36 ...

Page 38: ...R 4A52 R 4E52 r A BI C D E F G H L r E I 4 z B CD iz6 fZd 8 z 8Z x 8mn X p 45 PZ EZBB N e sif2 R 2 a z z 5 z 2 PBP z c z 3 p P c e c z z s cs 1 T Gi ii Y E C 5 6 z 5 e z E 8 i cd c s U P 1 2 3 4 5 6 37 ...

Page 39: ...R 4A52 R 4E52 w 1 _ I 5 _ IO BFzoo I i x L I 1 r I R64 is on this inserted position __ 1 9 L w IJl a n RY I CN A Figure S 4 Printed Wiring Board A 0 C D E F G H 38 ...

Page 40: ...aland Model 1 AX CABIN ET PARTS 2 1 FHNG A128WRMO Lower oven hinge 1 AF 2 2 GCABUA310WRPO Outer case cabinet 1 BF 2 3 MHNG A227WRMO Upper oven hinge 1 AE 2 4 PCOVPA211WRPO Turntable motor cover 1 AE 2 5 PCAPHA015WREO Cabinet cap white 2 AD 2 6 GLEGPA023WREO Foot 4 AC CONTROL PANEL PARTS I A CPWBFA366WRKO Control unit New Zealand only QCNCMAO78DREO 4 pin connector A 3 1B QCNCM0027WREO 2 pin connect...

Page 41: ...E52 3 4 GMADIA055WRFO Display window 3 5 JBTN A596WRFO Open button R4A52 JBTN A659WRFO Open button R4E52 3 6 MSPRTA050WREO Open button spring 3 7 XEPSD30PlOXSO Screw Control unit mtg 1AA 1 AA 1 AA 1 AA 1AA AH i AK 1 AA AS i AE 1 AB 1AA AC AA 1 AS 1 AS 1 BC BC t AE 1 AF 1 AF 1 AA 3 AA OVEN P ARTS 4 1 LBNDKA038WRPO Capacitor holder 1 AH 4 2 LSTPPA069WRFO Cord anchorage upper 1 AE 4 3 LSTPPA070WRFO C...

Page 42: ...Model TGAN A002WRRO Guarantee card For New Zealand Model 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 AV AF AF AB AD AA AH AF AC AX AH AE AB AB AB AB AA AB AA AA AA AB AA AA 3 AA 6 AA 3 AA AA AA AA AA AA AA AA AA AA I 6 5 6 6 6 7 6 8 I cj 6 10 6 11 SCREWS AND WASHERS Screw fuse holder mtg For Australian Model Screw M4 x 12 For Australian Model Screw M4 x 12 For New Zealand Model Screw M4 x 12 Special screw LHSTI...

Page 43: ...R 4A52 R 4E52 1 2 3 4 I 5 6 OVEN PARTS I 3 6 l 12 1 2 3 4 5 6 42 ...

Page 44: ...7 A B C D E F G H CONTROL PANEL PARTS R 4A52 3 1 P R 4A52 R 4E52 1 2 3 4 5 6 1 I d 3 3 CONTROL PANEL PARTS R 4E52 3 1 P 1 2 3 4 5 6 43 ...

Page 45: ...R 4A52 R 4E52 1 2 3 4 5 6 DOOR PARTS ___________ ______ _ _ _ _ _ _ _ I __ _ _ MISCELLANEOUS 240mm 1 2 3 4 5 6 4 44 ...

Page 46: ...ND ACCESSORIES A PACKING ADD KIT FOR R 4E52 7 CPADBA 108WRKO TRAY HOLDER __ _ _ tft SPADFA208WREO B C D E SPADFAOGlWREO F I Tray pad G FOR R 4A52 AUSTRALIA SPAKCB567WREO FOR R 4A52 NEW ZEALAND ic SPAKCB548WREO FOR R 4E52 H 1 2 3 I 4 5 6 45 ...

Page 47: ...R 4A52 R 4E52 SHARP 90 0 SHARP CORP lOK0 93E Printed in Japan ...

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