Sharp R-4A10 Service Manual Download Page 26 | Manualshive

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Summary of Contents for R-4A10

Page 1: ...rts identical to those specified should be used RDlGlOlU TABLE OF CONTENTS Page FOREWORD 1 CAUTION MICROWAVE RADIATION 1 PRODUCT DESCRIPTION 2 OPERATION 4 SERVICING TOUCH CONTROL PANEL ASSEMBLY 1 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 20 MICROWAVE MEASUREMENT PROCEDURE 24 PICTORIAL DIAGRAM 25 CONTROL PANEL CIRCUIT 26 PRINTED WIRING BOARD 27 PARTS LIST 28 PACKING AND ACCESSORIES 34 SHARPCOR...

Page 2: ...R4AlO R4A20 R4A30 ___c c 3 _ _ k Pug 3 x 1 7 e _ _ ss w z _ II be _ Photo R 4A20 Photo RQA30 ...

Page 3: ...ock and microwave radiation hazard RD361 ON 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 at...

Page 4: ...k and forth 4 900 000 000 times per second This high speed oscillation causes friction between the molecules thereby converting the microwave energy to heat RD41101U SPECIFICATION ITEM Power Requirements 240 Volts 50 Hertz DESCRIPTION Power Consumption Power Output Case Dimensions Single phase 3 wire earthed 13oow 700 watts nominal of RF microwaveenergy 2 liter water load Operating frequency of 24...

Page 5: ...P CLEAR PAD Touch to erase during programming Touch once to stop operation of oven during cooking touch twice to cancel cooking programme r AUTO START CLOCK PAD Touch to set clock or Auto Start time r VARIABLE COOKING CONTROL PADS Touch to select microwave power setting If not touched HIGH is automatically selected MORE A LESS r PADS Touch to increase decrease the time in one minute increments dur...

Page 6: ...mpletion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped oven will revert to the OFF condition The 6 When the door is opened during a cook cycle monitor switch upper latch switch and lower latch switch are activated with the following results The circuits to the turntable motor the cooling fan mo tor and the high voltage comp...

Page 7: ...e I a T I M v RECTIFIER L A MAGNETRON SCHEMATIC II CONTROL HIGH 4 START PAD TOUCHED NOTE CONDITION OF OVEf 1 DOOR CLOSED 2 COOKING TIME PROGRAMMED 3 VARIABLE COOKING I I s a I 1 k i 1 UNIT CONTROL i a2 45 83 e v h M V RECTIFIER Lam MAGNETRON N I Figure 0 1 Oven Schematic Off Condition Figure O 2 Oven Schematic Cooking Condition 4 aa13D bbb bbb 8 I ...

Page 8: ...opened and the upper latch switch contacts fail to open the monitor fuse blows si multaneously with closing of the monitor switch contacts CAUTiON BEFORE REPLACING A BLOWN MONI TOR FUSE TEST THE UPPER LATCH FOR PROPER OPERATION REFER TO CHAP TER TEST PROCEDURE DOOR OPEN MECHANISM The door can be opened by pushing the open button on the control panel refer to the Figure D l When the open button is ...

Page 9: ...ppear in display when power cord is first plugged into wall outlet Defective monitor switch NO power at outlet No power from service entrance Procedure G Check home fuse Check wall outlet I Open wire in power cord or wire harness I Replace same or repair wiring I I Blown fuse I Procedure H I I Defective temp fuse I Procedure F magnetron and oven I Open wire In power cord wlrrng harness Replace or ...

Page 10: ... Procedure E Procedure H I Defective temp fuse Magnetron and Oven 1 Procedure F 1 Defective relay RY 1 RY 2 on control unit Open or loose wiring to the above components Procedure I Check and repair wiring i Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end Defective magnetron Defective relay RY 2 on control unit Procedure...

Page 11: ...ION EASY DEFROST condition touching INSTANT COOK START Pad ERROR appears Programmed incorrectly EASY DEFROST will only operate on a specificweight Range for each food category See steps for Easy Defrost is Operation Manual Defective control unit Procedure I 9 ...

Page 12: ...4 2 x V x AT t Our condition for the water load is as follows Water load 2000 ml Heating time 120seconds P 70 x AT Measuring method 1 Put the water load of two 2 litres on the center of the oven shelf The water load should be arranged in two 2 Pyrex beakers the size of which is one 1 litre and be placed at right and left side by side on the oven shelf 2 Measure the temperature of water before heat...

Page 13: ...als and observe meter reading If a short is indicated in both directions or if an infinite resistance is read in both di rections the rectifier is probably defective and should be replaced R082601 U HIGH VOLTAGE CAPACITOR TEST DISCHARGE THE HlGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING E if the capacitor is open no high voltage will be available to the magnetron Disconnect ...

Page 14: ... monitor switch NC terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When the monitor switch actuater is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened in this condition the plunger of the monitor switch is pushed in the meter should indicate...

Page 15: ... 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 J PROCEDURES TO BE TAKEN WHEN THE F...

Page 16: ...v VREF LSI ICI ACL circuit 6 15V LSI ICl VP VF VF 24V Fluorescent display tube Grid and anode voltage 3V p p t nt of fluorescent display VF to VF voltaqe 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 RD918Al U 4 5 6 7 8 ACL Circ...

Page 17: ...ited with commercialsource frequency 50Hd This is the basic timing for time processing of LSI RO93FAl U PIN NO 6 1 SIGNAL j CNVSS Power source voltacle input terminal Connected to GND I I O IN RD93GA2U PIN NO 1 7 10 f SIGNAL 1 FO F3 I l O OUT Seament data signals Refer to the touch control panel circuit for the relationship between signals and indicators Normally one pulse is output in every synch...

Page 18: ...ianal 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 RD939A3U PIN NO 17 1 SIGNAL S6 I l O OUT Segment data sicrnal Signal similar to FO Kev strobe sianal Signal applied to touch key section A pulse signal is input to K4 K7 terminal while one of D l line keys on key matrix is to...

Page 19: ...PIN NO 1 32 1 SIGNAL j Dl I I O I OUT Mannetron HiQh voltage circuit driving signal To turn on and off the cook relay In high operation the signals holds H level during microwave cooking and L level while not 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 RD933Al U PIN NO 33 1 SIGNAL DO I I O j OUT Oven lam...

Page 20: ... on key matrix is touched a corresponding signal will be input into K5 RD93CA2U PIN NO 1 38 SIGNAL K4 I I O IN Signal comincr from touch kev When either one of D l 1 line keys on key matrix is touched a corresponding signal will be input into K4 RD93CA2U PIN NO j 39 1 SIGNAL j K3 I l O 1 IN Terminal to chanse functions accordinq to the model By using the A D converter contained in the LSI DC volta...

Page 21: ...ervicing the touch control panel assembly 1 Soldering iron 30W To prevent leaking current it is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or more ad vanced model 3 Others Hand tools 5 Other Precautions included of the touch control panel while keeping it in contact with the oven proper 6 On some models on the other hand t...

Page 22: ... case Discharge high voltage capacitor Remove one 1 screw holding capacitor holder to oven unit Remove one 1 screw holding earth side terminal of rectifier and remove capacitor holder 5 Disconnect wire leads and terminal of rectifier from high voltage capacitor Now rectifier is free 6 Disconnect terminals of short protector from high voltage capacitor Now capacitor is free CAUTION WHEN REPLACING R...

Page 23: ...pply Remove turntable motor cover by removing two 2 screws Disconnect wire lead from turntable motor and re move two 2 screws holding turntable motor Turntable motor is free now NOTE This scmw must k wified 1cf8w XF PSD4OPlOOOO on Parts Liet XFPSD4OPlOOOO m 1Omm used the Figure C l TURNTABLE COUPLING REMOVAL Remove turntable motor refer to Turntable Motor Removal Remove washer At this time turntab...

Page 24: ...2 The Upper and Lower latch switches interupt the circuit before the door can be opened 3 The monitor switch contacts close when the door is opened 4 Re install the outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure MONITOR SWITCH UPf ER LATCH SWITCH LOWER LATCH SWITCH STOP SWITCH SWITCH LEVER lOPEN BUTTON Fig...

Page 25: ...d mlcrowave survey meter should be used to assure In compliance with proper mtcrowave radiation standards Refer to Microwave Measurment Procedure UPPER R4AlO AND ADJUSTMENT EEg DOOR ADJUSTMENT When removing and or loosening hinge such as in the case of door replacement the following adjustment criteria are taken Door is adjusted to meet the following three conditions by keeping screws of hinge loo...

Page 26: ...er formance standard for microwave ovens must be used for testing 2 3 4 5 6 Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M Place the oven tray into the oven cavity Place the load of 275 f 15ml of water initially at 20 f5 C in the center 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 elec...

Page 27: ...I I G I n I m I 0 1 n I a I b MAIN Touch conrrol unit SUPPLY CORD u I LATCH SWITCH CN 0 J t MOTOR THE COLOA OF CN A IS WHITE Figure S l Pictorial Diagram I c I n I I I m 0 0 0 I b 333 bbb LRE 000 I ...

Page 28: ...I 2 3 aaa IrZ MJ CM d lOJ lJO 2 S t3Jdhj i MCI1 03ljO3dE ION I YOMW lW NWll YOlOW NV4 WV1 NitA0 Z05NvyA E ...

Page 29: ...r 1 2 Figure S 3 Printed Wiring Board 3 4 5 6 27 ...

Page 30: ...assis AB 2 4 GLEGPAOOGWREO Foot 1 AP 2 5 LSTPPOO65WRFO Cord anchorage upper 4 AB 1 AA 2 6 2 7 LSTPP0066WRFO Cord anchorage lower PCUSU0455WRPO Shading cushion 1 AA 2 8 2 9 PSPAGQ002YBEO Vibration proof cushion 1 AA 2 10 LBNDKA015WRWO Capacitor holder PDUC A134WRFO Fan duct 1 2 11 AG FFANJA013WRKO Fan blade 2 1lA 2 12 LSTY 0030WRE0 Fan retainer clip AE PCAPH0030WREO Cabinet cap i AA 2 13 2 14 PHOK ...

Page 31: ...e HZ6C 2 2 VHEHZllA3 1 Zener diode HZllA 3 HPNLCA334WRFO Control panel frame R 4AlO R 4A20 3 HPNLCA664WRFO Control panel frame R 4A30 DUNTKA279WRKO Key unit R 4AlO DUNTKA278WRKO Key unit R 4A20 4 DUNTKA311WRKO Key unit R 4A30 JBTN A273WRFO Open button R 4AlO R 4A20 JBTN A524WRFO Open button R 4A30 MSPRDA003WREO Open button spring XHPSD30P12XSO Screw Control unit mtg 3 5 3 6 OVEN PARTS 4 1 DOVN A18...

Page 32: ...etcwhite mtg 4 AA 7 2 XFPSD40PlOOOO Screw 7 3 magnetron and turntable motor cover mtg 6 AA XHTSD40P08RVO Screw lamp access cover capacitor holder 3 AA 7 4 monitor resistor mtg XOTSD40P12RVO Screw unit chassis upper and lower hinge and 9 AA 7 5 control panel mtg XTTSD40P12000 Screw fan motor ass y mtg 1 AA 7 6 LX EZA004WREO Screw latch hook mtg 2 AA 7 7 XFPSD30P08XOO Screw lamp socket mtg AA 7 8 7 ...

Page 33: ...R4AlO R4A20 R4A30 CABINET PARTS 0 l 9 6 d y ft M0 1 If d b I j b J I 9 0 4 a 2 2 6 2 7 I Yl f P t I I i I I I 1 I 2 I 3 I 4 I 5 I 6 31 ...

Page 34: ...R4AlO R4A20 R4A30 w 1 I C 0 E F G 1 2 3 4 S 6 OVEN PARTS 0 2 15 1 2 I 3 4 I 5 I 6 32 ...

Page 35: ...R4AlO RQAPO R4A30 1 2 I 3 I 4 5 I 6 CONTROL PANEL PARTS 0 3 3 0 0 DOOR PARTS 0 C D E I I I I F t I I I f 1 I f G i I I H 0 3 6 MISCELLANEOUS 7 6 7 a IO 1 cla 6 12 0 ...

Page 36: ...Y OPERATION MANUAL C 1 a COOK BOOKLET DOOR PROTECTION SHEET 0 SPA DPO336W REO SHRINK FILM SHEET TRAY HOLDER SPADFA049WREO ACCESSORIES ASSENBLY 1 2 3 4 S 6 PACKING ADO KIT D E F G I l Not Replaceable items 1 I 2 I 3 4 5 __ 8 34 88 0 SHARP CORP 8N0 75E Printed in Australia ...

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