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R-4H56

SHARP CORPORATION

SERVICE MANUAL

In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.

MODEL

R-4H56

S8405R4H56PJ/

MICROWAVE OVEN

TABLE OF CONTENTS

Page

CAUTION, MICROWAVE RADIATION ................................................................................................................  1
WARNING .............................................................................................................................................................. 1
PRODUCT SPECIFICATIONS .............................................................................................................................  2
GENERAL INFORMATION ................................................................................................................................... 2
APPEARANCE VIEW ...........................................................................................................................................  3
OPERATION SEQUENCE ...................................................................................................................................  4
FUNCTION OF IMPORTANT COMPONENTS ....................................................................................................  5
SERVICING ..........................................................................................................................................................  7
TEST PROCEDURE ............................................................................................................................................  9
TOUCH CONTROL PANEL ................................................................................................................................ 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...............................................................  24
MICROWAVE MEASUREMENT ........................................................................................................................  30
WIRING DIAGRAM ............................................................................................................................................. 31
PICTORIAL DIAGRAM .......................................................................................................................................  32
CONTROL PANEL CIRCUIT .............................................................................................................................. 33
PRINTED WIRING BOARD ................................................................................................................................ 34
PARTS LIST ........................................................................................................................................................  35

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Summary of Contents for R-4H56

Page 1: ... OVEN TABLE OF CONTENTS Page CAUTION MICROWAVE RADIATION 1 WARNING 1 PRODUCT SPECIFICATIONS 2 GENERAL INFORMATION 2 APPEARANCE VIEW 3 OPERATION SEQUENCE 4 FUNCTION OF IMPORTANT COMPONENTS 5 SERVICING 7 TEST PROCEDURE 9 TOUCH CONTROL PANEL 18 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 24 MICROWAVE MEASUREMENT 30 WIRING DIAGRAM 31 PICTORIAL DIAGRAM 32 CONTROL PANEL CIRCUIT 33 PRINTED WIRING BOAR...

Page 2: ...R 4H56 ...

Page 3: ...sed 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 WARNING Never oper...

Page 4: ... Dimensions Width 550 mm Height 312 mm Depth 420 mm Cooking Cavity Dimensions Width 381 mm Height 210 mm Depth 411 mm Turntable diameter 360mm Control Complement Touch Control System Clock 1 00 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...

Page 5: ...TANTACTIONPADS Press tooncetocook1of6 popular menus MORE LESS PADS Presstoincrease decreasethetime inoneminuteincrementsduring cookingortoalterthedonenessfor theSensorInstantAction Reheat Sensor SensorCookorEasyDefrost mode INSTANTCOOK STARTPAD Pressoncetocookfor1minuteat HIGHorincreaseby1minute multipleseachtimethispadis pressedMicrowave Convection GrillorMixcooking AUTOSTART CLOCKPAD Presstosetc...

Page 6: ...Closed Open Monitor switch COM NC Open Closed Stop switch COM NO Closed Open The circuits to the power transformer fan motor and turntable motor are cut off when the upper latch switch lower latch switch and stop switch are made open The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted because the relay RY1 stays closed Shown in the display is the r...

Page 7: ...e oven will revert to an OFF condition 1 Potatoesatroomtemperature Vapor is emitted very slowly 2 Heat potatoes Moisture and humidityisemittedrapidly You can smell the aroma as it cooks 3 Sensor detects moisture and humidity and calculates cooking time and variable power Cooking Sequence 1 Touch each SENSOR COOK function pad to operating the sensor cooking NOTE The oven should not be operated on S...

Page 8: ... 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 chan nelled through the oven cavity to remove steam and va pours given off from the heating foods It is then exhausted through the exhausting air vents at the oven cavity D2 D1 ASYMMETRIC RECTIFIER HIGH VOLTAGE RECTIFIER A B C The rated peak reverse v...

Page 9: ... out 3D checks and reconnect the leads to the primary of the power transformer REMEMBER TO CHECK 4R 1 Reconnectallleadsremovedfromcomponentsduring 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...

Page 10: ...plugged into wall outlet Display doesnotoperateprop erly when STOP CLEAR pad is touched Oven lamp does not light at door opened Display ap pears Oven does not start when the START pad is touched Dis play appears Oven lamp does not light Dis play appears Fan motor does not operate Display appears Turntablemotorassemblydoes notoperate Displayappears Oven or any electrical parts does not stop when co...

Page 11: ...ows P x t 4 187 V x T P W 4 187 x V x T t Our condition for water load is as follows Room temperature around 20 C PowersupplyVoltage Ratedvoltage Water load 1000 g Initial temperature 10 2 C Heating time 47 sec P 90 x T 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 approxima...

Page 12: ...with V ml rises T C during this microwave heating period the calorie of the water is V x T The formula is as follows P 8330 x T t Our condition for water load is as follows Room temperature 23 2 C Power supply Voltage Rated voltage Water load 2000 ml Initial temperature 23 1 C Heating time 1 min 51sec P 75 x T Measuring method A The two water containers must be prepared The water container must be...

Page 13: ...d be replaced CARRY OUT 4R CHECKS C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS Isolate the high voltage rectifier assembly from the HV 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 an...

Page 14: ...easuring 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 volt...

Page 15: ...the table below H MOTOR WINDING TEST Table Resistance of Motor Motors Resistance Fan motor Approximately 295 Ω Turntable motor Approximately 12 5 kΩ If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS LIVE TEST FOR MOTOR WINDINGS CAUTION THE FOLLOWING PROCEDURE REQUIRES THE OVEN TO BE CONNECTED TO THE SUPPLY AND SHOULD ONLY BE USED IF THE RELEVANT COLD CHECKS FOR THE MOTOR UND...

Page 16: ...ad produces no signal 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the key unit test to determine if control units faulty 2 1 In connection with pads a When touching the pads 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...

Page 17: ... RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 Approx 15V D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 24V D C Power transformer NOTE At the time of these repairs make a visual inspectionofthevaristorforburningdamage and examine the transformer with tester presenceoflayershort circuit checkprimary coil resistance If any abnormal condition is detected replace the defective...

Page 18: ... and number pads 1 and 0 Now the oven is in the sensor cooking condition and SC 10 will appear in the display 5 Touch Start pad The oven will operate for the first 16 seconds without generating microwave energy NOTE ERROR will appear if the door is opened or STOP CLEAR pad is touched during first stage of sensor cooking 6 After approximately 16 seconds microwave energy is produced oven should turn...

Page 19: ... by AH sensor 6 4 After approximately 3 seconds cooking operation turns off an audible signal will sound and the display will then revert to the time of day If the above is not the case the control unit is probably defective If the above is proper the AH sensor is probably defective R1 R2 22 ohm 1 1 2W R3 10k ohm 5 1 4W R4 1M ohm 5 1 4W Plunger NC NO COM COM NO NC R3 R4 R1 R2 1 2 3 F 1 F 2 F 3 To ...

Page 20: ...s 13 segments are used for displaying figures 10 Weight Sensor Circuit The circuit measures the weight of food by piezo electric device The touch control section consists of the following units as shown in the touch control panel circuit 1 Key Unit 2 Control Unit The principal functions of these units and the signals com municated among them are explained below Key Unit The key unit is composed of...

Page 21: ...set the LSI to the initial state when power is applied Set to L level the moment power is applied at this time the LSI is reset Thereafter set at H level 13 E0 OUT Terminal not used 14 E1 IN OUT Terminal not used 15 INT1 IN Signal to synchronize LSI with commercial power source frequency This is basic timing for all real time processing of LSI 16 E3 OUT Magnetron high voltage circuit driving signa...

Page 22: ...lar to H4 33 VPP IN Anode segment of Fluorescent Display light up voltage 25V Vp voltage of power source circuit input 34 F0 OUT Digit selection signal Signal similar to H4 35 36 B0 B1 OUT Digit selection signal Signal similar to H4 37 B2 OUT Segment data signals The relationship between signals and indicators are as follows Signal Segment Signa Segment B2 LB G0 f G6 UB B7 e G5 k B6 d G4 j B5 c G3...

Page 23: ...Signal similar to B2 Key strobe signal Signal applied to touch key section A pulse signal is input to H0 H3 terminal while one of G 7 line keys on key matrix is touched 44 G1 OUT Segment data signal Signal similar to B2 Key strobe signal Signal applied to touch key section A pulse signal is input to H0 H3 terminal while one of G 8 line keys on key matrix is touched 45 49 G2 G6 OUT Segment data sig...

Page 24: ...ntrol sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds later the detector circuit starts to function and the LSI observes the initial voltage available at its A6 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change ABSOLUTE HUMIDITY SENSOR CIRCUIT the resistance values in parallel with R 1 Changing the res...

Page 25: ...uded 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 e...

Page 26: ...ven from power 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 1 inch 3 cm to free it from retaining clips on the cavity face plate 5 Lift the entire case from the oven 6 Discharge the H V capacitor before carrying out any further work 7 Do not operate the oven with the outer case removed N B Step 1 2 an...

Page 27: ...e tab holding the oven lamp socket 5 Remove the oven lamp socket 6 Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the flat type small screw driver 7 Now the oven lamp socket is free Oven lamp socket Terminal Wire lead Flat type small screw driver Terminal hole Figure C 1 Oven lamp socket 5 Remove the two 2 screws holding the turntable motor ...

Page 28: ...o the fan motor shaft according the following procedure 1 Hold the centre of the bracket which supports the shaft Shaft Table Center of bracket 1 CARRY OUT 3D CHECKS 2 Disconnect the main harness and low voltage harness from the control panel 3 Remove the single 1 screw holding the control panel to the oven cavity 4 Lift up the control panel assembly and pull it forward Now the control panel assem...

Page 29: ... upper latch switch and lower latch switch interrupt the circuit before the door can be opened 3 The monitor switch contacts close when the door is opened 4 The stop switch contacts open when the door is opened 5 Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure MONITOR SWITCH UPPER LATCH SWITCH STO...

Page 30: ...ge around the door with an approved microwave survey meter Refer to Microwave Measure ment Procedure LATCH HEADS LOWER OVEN HINGE DOOR ASSEMBLY UPPER OVEN HINGE OUTER CASE CABINET RE INSTALL Figure C 6 Door Assembly Replacement and Adjustment 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 and door panel as shown in t...

Page 31: ... from the door assembly now the door frame is free Note We recommend to replace the door assembly when thedoorframeorthedoorpanelisreplaced Because it is little difficult to remove the door frame from the door panel SEALER FILM Removal 1 Tear the sealer film from the door panel 2 Now the sealer film is free Installation 1 Put the adhesive tape on the backing film of the sealer film 2 Tear the back...

Page 32: ...crowave 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 material suc...

Page 33: ...WER TRANSFORMER MAGNETRON ASYMMETRIC RECTIFIER CAPACITOR AC2100V µ 240V 50Hz OL 1 13 TEMP FUSE A1 B2 B1 F3 F2 F1 A3 A5 COM RY1 RY2 CONTROL UNIT MONITOR SWITCH AH SENSOR MONITOR RESISTOR 0 8 20W H V RECTIFIER TTM NEUTRAL LIVE N O FM BLU 18 BRN 18 G Y 18 EARTH FUSE M8A THERMAL CUT OUT UPPER LATCH SWITCH LOWER LATCH SWITCH STOP SWITCH OVEN LAMP FAN MOTOR TURNTABLE MOTOR POWER TRANSFORMER MAGNETRON AS...

Page 34: ...TTM SW2 SW4 SW1 R TF1 RED OVEN LAMP OL RED WHT RED RED WHT RED RED WHT WHT RED WHT RED RED MONITOR SWITCH NC COM SW3 WHT RED 5 4 3 2 1 GRN RED 2 1 BRN ORG WHT R E D G R N W H T W H T W H T RED RED CONTROL PANEL CN F CN B RY2 COM CN A 1 3 5 NO 2 1 CN B RY2 CN A RY2 COM NO P P P P P THERMAL CUT OUT TC 145 OVEN P P P P P P P FUSE M8A F FAN MOTOR FM CONNECTOR CE 230 CONNECTOR CE 230 EARTH NEUTRAL HIGH...

Page 35: ...CF1 CST4 00MGW R113 R110 R111 R112 100K X 4 F 2 F 2 U B k F 1 F 1 N C 1 G 2 G 3 G 4 G 5 G 6 G L B j i h g f e d c b a 2 6 2 5 2 3 2 2 2 1 2 01 9 1 8 1 71 6 1 5 1 4 1 3 1 2 1 0 9 8 7 6 5 4 2 1 IC 2 IZA310DR 1 5 10 15 20 25 27 28 30 35 40 45 50 54 VSS VASS VREF A0 A1 A2 A3 C0 C1 INT1 E3 A4 E1 RESET E0 A6 A7 A5 H1 H2 C7 H0 C6 C4 C5 C2 C3 0 IN 0 OUT TEST VCC G7 G6 G5 B3 B2 B5 B4 G4 B6 G0 B7 G2 G1 G3 H...

Page 36: ...34 R 4H56 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 Figure S 3 Printed Wiring Board ...

Page 37: ...laceble Item 1 BS 3 1A QCNCMA234DRE0 3 pin connector A 1 AC 3 1B QCNCMA275DRE0 2 pin connector B 1 AB 3 1C QCNCMA237DRE0 3 pin connector F 1 AD 3 1D QCNCWA030DRE0 12 pin connector G 1 AE 3 1E RV KXA037DRE0 Fluorescent display tube 1 AU C1 RC KZA087DRE0 Capacitor 0 1uF 50V 1 AA C2 VCEAB31VW108M Capacitor 1000uF 35V 1 AF C3 VCEAB31EW476M Capacitor 47uF 25V 1 AA C4 VCKYB11EX153N Capacitor 0 015uF 25V...

Page 38: ... 4 MSPRCA050WRE0 Open button spring 1 AB 3 5 XEPSD30P10XS0 Screw Control unit mounting 3 AA OVEN PARTS 4 1 LBNDKA038WRP0 Capacitor holder 1 AH 4 2 LSTPPA069WRF0 Cord anchorage upper 1 AE 4 3 LSTPPA070WRF0 Cord anchorage lower 1 AD 4 4 FDAI A150WRY0 Bottom plate 1 AY 4 5 PDUC A406WRF0 Air duct 1 AK 4 6 PHOK A076WRF0 Latch hook 1 AQ 4 7 PCUSUA237WRP0 Waterproof cushion 1 AF 4 8 FDUC A222WRY0 Sensor ...

Page 39: ...408WRR0 Menu label 1 AD 6 14 LHLDWA010WRE0 Purse lock S 1 AC 6 15 UKOG A007WRE0 Touch up paint 1 AT SCREWS NUTS AND WASHERS 7 1 XFPSD30P10000 Screw M3 x 10 zinc plated steel 1 AB 7 2 XOTSD40P12RV0 Screw M4 x 12 7 AB 7 3 XOTSD40P12000 Screw M4 x 12 7 AA 7 4 XBTUW40P08000 Screw M4 x 8 1 AA 7 5 XFTSD40P30000 Screw M4 x 30 zinc plated steel 1 AA 7 6 LX CZ0052WRE0 Special screw 2 AA 7 7 LX EZA036WRE0 S...

Page 40: ... 2 2 1 2 4 7 12 7 3 2 5 7 2 7 2 4 18 1 9 6 9 7 10 1 16 1 13 7 7 4 10 4 6 1 17 1 18 1 4 1 3 4 5 4 2 1 10 7 17 1 12 4 22 7 16 4 24 1 7 7 12 4 23 1 8 4 1 1 14 4 28 7 8 4 13 4 12 2 3 7 2 x 2 4 19 6 6 1 5 4 7 1 1 7 9 7 8 2 5 7 3 4 9 7 5 1 6 4 3 4 14 7 12 7 14 7 11 7 6 7 12 7 12 4 25 4 25 2 2 7 10 7 3 4 26 4 27 7 19 7 19 2 5 1 11 7 1 1 2 4 4 4 16 6 7 7 9 1 19 7 9 4 8 ...

Page 41: ...39 R 4H56 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 CONTROL PANEL PARTS DOOR PARTS 3 5 3 2 6 10 3 3 3 4 3 1 3 2 1 5 4 5 3 5 2 5 1 5 6 5 5 5 5 7 7 15 7 15 ...

Page 42: ...ay be different than illustration 6 8 240 mm 6 12 6 4 6 14 6 11 6 3 TRAY HOLDER SPADFA208WRE0 TURNTABLE TRAY INSTRUCTION BOOK COOK BOOK ROLLER STAY TRAY PAD SPADFA207WRE0 DOOR PROTECTOR SPADPA178WRE0 DOOR PAD SPADFA061WRE0 TOP PAD SPADBA524WRE0 PLASTIC BAG SSAKHA032WRE0 PACKING ADD KIT CPADBA113WRK0 PACKING CASE SPAKCC389WRE0 Not replacement Items ...

Page 43: ...41 R 4H56 ...

Page 44: ...42 R 4H56 94SHARP CORP 08K0 820E Printed in Australia ...

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