Sharp R-4H55 Service Manual Download Page 2

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Summary of Contents for R-4H55

Page 1: ...fied should be used TABLE OF CONTENTS GENERAL IMPORTANT INFORMATION we WARNING RODUCT SPECIFICATIONS 2 APPEARANCE VIEW 3 OPERATING SEQUENCE FUNCTION OF IMPORTANT COMPONENTS TRABLESHOOTING CHART 7 TEST PROCEDURE 10 TOUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 27 MICROWAVE MEASUREMENT 30 WIRING DIAGRAM 34 PICTORIAL DIAGRAM 36 CONTROL PANEL CIRCUIT 38 PRINTED WIRING BOAD 40 P...

Page 2: ... L I _ __ 11w As j prl s i m d R 4X55B R 4X55 ...

Page 3: ...ached Never look into an open waveguide 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 visible damage with the oven Servicing and repair work must be carried out only by trained service engineers All the...

Page 4: ...ntrol System Clock 1 OO 12 59 Timer 0 99 minutes 99 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 DEFROST SENSOR R 4X55 4X55B WEIGHT ADJUST R 4X55 4X55B EASY DEFROST R 4H55 SENSOR INSTANT ACTION SENSOR COOK REHE...

Page 5: ...to cook 1 of 6 popular menus f NUMBER PAD Press to enter cooking times clock time or to select the Sensor Cook menus g POWER LEVEL PAD Press to select microwave power setting If not pressed HIGH is automatically selected 5 2 3 4 5 0 r L 6 7 8 9 0 gc jgqig s h EASY DEFROST PAD R 4H55 Press to defrost meat by entering weight i MORE A LESS v PADS Press to increase decrease the time in one minute incr...

Page 6: ... cook cycle the switches come to the following condition CONDITION SWITCH DURING DOOR OPEN CONTACT COOKING NO COOKING Upper latch switch COM NO Closed Open Lower latch switch COM NO 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 switc...

Page 7: ...ve minutes before cooking on SENSOR COOK REHEAT SENSOR or SENSOR INSTANT ACTION 2 3 4 Select desired Sensor setting Touch START pad REHEAT SENSOR and SENSOR INSTANT ACTION fuction are not neccessary to touch START pad The coil of shut off relay RY 1 is ener gized the turntable motor oven lamp and cooling fan motor are turned on but the power transformer is not turned on After about 16 seconds the ...

Page 8: ...e each peak reverse voltage goes beyond the each rated peak reverse voltage The process of blowing the fuse M8A 1 The high voltage rectifier is shorted by any causes when microwave cooking 2 The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1 7 KV in the voltage doubler circuit 3 D2 of the rectifier is shorted 4 The large electric currents flow through the ...

Page 9: ... is of the the door and set the microwave timer for two 2 min connecting lead of the high voltage rectifier against utes Set the power level to HIGH and push the START the chassis with the use of an insulated screwdriver button When the two minutes has elapsed timer at zero carefully check that the water is now hot If the Sharp recommend that wherever possible fault finding water remains cold carr...

Page 10: ...Oven or any electrical parts does not stop when cooking time is 0 or STOP CLEAR pad is touched Oven seems to be operating but little 0 0 0 00 00 00 0 0 0 0 00 or no heat is produced in oven load 0 0 0 0 Ly rwave power level is set at 0 00 OOKMG Oven does not seems to be operating roperly when MEDIUM HIGH ME oNDrTtoN EIUM MEDIUM LOW or LOW i sset Oven operates roper1 at HIGH and then the ST 8 I P C...

Page 11: ... 7 0 I I I 0 ii 9 I it 5 I Ii 5 5 0 I 3 t Cl z z if 2 2 5 8 1 5 5 5 1 7 5 3 I 0 I CC n 2 8 it 2 iii 9 0 3 D ii g 2 if 0 4 E2 3 3 I CF I c 5 si 5 a r 0 3 5 0 0 E s 4 2 8 2 i 0 d 7 j CK ks 2 aw 0 g 5 I 5 0 e 8 d 1 i 3 l 7 P 3 z 2 3 wz 0 e 52 2 I ...

Page 12: ...rises AT C during this microwave heating period the calorie of thewater is V x AT The formula is as follows Pxtl4 187 VxAT P W 4 187xVxAT t Our condition for the water load is as follows Room temperature around 20 C Power supply Voltage Rated voltage Water load 1000 g Initial temperature 10 2 C Heating time 47 sec P 90xAT Measuring condition 1 Container The water container must be a cylindrical bo...

Page 13: ... 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 C Pow...

Page 14: ...ts are present at the secondary winding and fila ment winding of the power transformer It is very dangerous to work near this 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 from...

Page 15: ...ring 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 3D CHECKS A Isolate the high voltage capacitor from the circuit B 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 short time ki...

Page 16: ...SE OR THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temperature fuse or thermal cut out Then using an ohmmeter make a continuity test across the two terminals as described in the table below CARRY OUTa CHECKS Table Thermal cut out Test Parts Name Thermal cut out 145 C Temperature fuse 15o C Temperature of ON condition Temperature of OFF condition Indicatio...

Page 17: ...vel to HIGH and set the relevant timer for about three 3 minutes 7 Note the reading on the meter and carefully observe the motor under test to see if it is turning 8 CARRY OUT 3D CHECKS 9 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 I...

Page 18: ...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 L KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first veri...

Page 19: ...ION 1 The rated voltage is not applied to POWER Check supply voltage and oven main unit terminal of CPU connector CN A 2 The rated voltage is applied to primary side of Power transformer or secondary circuit defective Check power transformer and repair I I 3 Only pattern at a is broken Insert jumper wire Jl and solder I I 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and ...

Page 20: ...ve energy NOTE ERROR will appear if the door is opend or STOP CLEAR pad is touched during first stage of sensor cooking 6 After approximately 16 seconds microwave energy is produced oven should turn off when water is boiling bubling If the oven does not turn off replace the AH sensor or check the control unit refer to explanation below TESTING METHOD FOR AH SENSOR AND OR CONTROL UNIT To determine ...

Page 21: ...power point 88 88 will appear on the display 3 Press the STOP CLEAR pad Display shows with sound of buzzer 4 Press the AUTO START CLOCK pad Display shows 5 Press the DEFROST SENSOR pad Display shows 0 with sound of buzzer 6 Press the POWER LEVEL pad Display shows O O 7 Press the INSTANT COOK START pad Display shows TEST with sound of buzzer 8 Press the 4 of number pads Display shows lamps come on ...

Page 22: ...ltage Application VC 5 2v LSI ICl ACL circuit VP 25V Fluorescent display tube Grid and anode voltage VFl 3Vac Filament of fluorescent display tube VF2 VFl to VF2 voltage 4 ACL Circuit A circuit to generate a signal which resets the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzzer is responds to signals from the LSI to emit noticing sounds key touch sound and completion s...

Page 23: ... innut This input is an analog input terminal from the AH sensor circuit and connected to the A D convener built into the LSI 11 12 13 14 15 A7 IN Used for intial balancing of the bridge circuit absolute humidity sensor This input is an analog input terminal from the AH sensor circuit and connected to the A D coverter built into the LSI RESET IN Auto clear terminal Signal is input to reset the LSI...

Page 24: ...gnal and digit are as follows Digit signal Digit H H4 ________________________________ 1St S so Z I H5 ________________________________ 2nd ____ _ ____ GND H6 ________________________________ 3rd vp H7 ________________________________ 4th FO _____ ____________________________ 5th BO Bl ____________________________ 6th Normally one pulse is output in every 6 period and input to the grid of the Fluo...

Page 25: ...hed Seament data sianal Signal similar to B2 Kev strobe sianal Signal applied to touch key section A pulse signal is input to HO H3 terminal while one of G 6 line keys on key matrix is touched Seament data sianal Signal similar to 82 Kev strobe sianal Signal applied to touch key section A pulse signal is input to HO H3 terminal while one of G 7 line keys on key matrix is touched Seament data siana...

Page 26: ... LSI to control 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 IN1 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R l Changing the resistance values results...

Page 27: ...ector section When the roller below the turntable presses the knob through oven seal the piezO electric device generates the voltage according the load applied on the roller Weight sensor and then sent to A D conversion input pin A5 inside of LSI The LSI converts the value into weight and calculates the heating time Weight measurement is made by the three rollers passing on the knob taking the ave...

Page 28: ...ded 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 en...

Page 29: ...om rear and along the side edge N B Step 1 2 and 6 from the basis of the 3D checks 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 CAUTION DISC 11 I 1 I TOH Ott u COMPONEI JHAHtit HltiH VULI Atit C Al AC I A IRE TOUCHING ANY OVEN ITS OR WIRING POWER TRANSFORMER REMOVAL 1 CARRY OUT 3D CHECKS 2 Remov...

Page 30: ...bottom plate and remove the cover 6 Turntable motor is now free At this time o ring and Disconnect the wire leads from turntable motor washer is removed Do not loose them TURNTABLE COUPLING REMOVAL Remove the turntable motor refer to Turntable Motor Removal At the time turntable coupling will be free Figure C 2 Turntable Coupling FAN MOTOR REPLACEMENT REMOVAL 1 CARRY OUT 30 CHECKS 2 Disconnect the...

Page 31: ...e oven cavity with one 1 screw 6 Re install the snap band of the wire leads to the oven lamp to the hole of the oven cavity 7 Re install the H V wire A and filament lead into the holes in the fan duct and then re connect them to the magnetron referring to the pictorial diagram 8 Re connect the wire leads to the fan motor referring to the pictorial diagram These are ese are the position the positio...

Page 32: ... For Australia Model POWER SUPPLY CORD REPLACEMENT FOR NEW ZEALAND MODEL Removal CARRY OUT 30 CHECKS Loosen the two 2 screws holding the brown and blue 1 2 3 4 5 wires of the power supply cord to the cord connector on the noise filter Loosen the single 1 screw holding the earth angle and earth wire of power supply cord Remove the single 1 screw holding the cord anchor ages to the oven cavity Remov...

Page 33: ...acts 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 Measure ment Procedure LATCH MONITOR HOOK SWITCH LEJ V SWITCH Figure C 7 Latch Switches Adjustment DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 1 CARRY OUT 3D CHECKS 2 Remove ...

Page 34: ... head from the holes in the door panel Release the latch spring with the latch head from the tabs of the door panel 5 Release the latch spring from the latch head 6 Now the latch head is free LATCH HEAD RE INSTALL 1 Pick up the latch spring and catch the one ring of the latch spring on the tab of the door panel as shown in Figure C i 0 2 Catch the other ring of the latch spring on the tab of the l...

Page 35: ...r 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 5X 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 36: ... 1Y P E ii F P iu a 2 I TTN Tm TzE i Ij Cni zh i 6 ozi g 121 ODL z 5 c 1 r I lWI _A Figure O l a Oven Schematic OFF Condition For Australlia model NOTE WEIGHT SENSOR IS USEDFOR MODEL R 4X55 AND R 4X55B Figure 0 2 a Oven Schematic ON Condition For Australlia model 34 ...

Page 37: ... I F a Figure O l b Oven Schematic OFF Condition For New Zealand model 1 T 1 j L J 1 I I 3 b b 3 55n 0 Fa g str 3 22 Figure 0 2 b Oven Schematic ON Condition For New Zealand model 35 ...

Page 38: ...I il 4 2 z i g 3 cii3 55 F I I 3 r f E 1 I 2 I 3 I 4 I 5 I 6 36 A E C D E F G H A a C D E F G H ...

Page 39: ...R 4H55 R 4X55 A 4X558 1 I 2 I 3 I 4 I 5 I 6 r 1 I I J Y Kc9 Z30 WC g D 4 0 j 2 F aa 3 w t d a 20 a5 2s 1 g I I t 37 ...

Page 40: ...R lX55 B 1 I 2 I 3 I 4 I 5 I 6 Ir A E c D E F G H I 9 m lit 53 I 5 iW1SID O 3 N I a ZYii z r ASZ I 3 2 G e i B c Z I XIZd ISE OOPI 13 I f J i B hOP dI O r 1 I 5 t N I I _ _ _ _ I 7 i 1 I 2 I 3 I 4 I 5 I 38 I 6 ...

Page 41: ...R 4H55 R 4X65 R 4X558 I 1 I 2 I 3 I 4 I 5 I 6 A B c D E F G H 4 I I 1 HH lIr y J i p J l i E 7 z I s fg g u B a a B a P o gge u P 4EB Y it T E z al 5 Ep IA 1 I I c I 3 I 4 I 5 I 6 39 ...

Page 42: ...A B C D E F G H Figure S 5 Printed Wiring Board 1 I 2 I 3 I 4 I 5 I 6 40 ...

Page 43: ...ase cabinet R 4H55 R 4X551 GCABUA429WRPO Outer case cabinet R 4X55Bl MHNG A28OWRTO Upper oven hinge PCOVPA249WRPO Turntable motor cover PCAPHA015WREO Cabinet cap R 4H55 R 4X551 PCAPHA009WREO Cabinet cap R 4X55Bl GLEGPAO23WREO Foot AM BE BE AM AK AD AC AC CONTROL PANEL PARTS 3 1 CPWBFA53OWRKO Control unit New Zealand only R 4X55 R 4X55Bl 1 BT 3 1 CPWBFA529WRKO Control unit Not Replaceble Item R 4H5...

Page 44: ... ohm 1w 1AA R60 VRD B12EF512J Resistor 5 lk ohm 1 4w 1AA R61 VRD Bl2EFlOlJ Resistor 100 ohm 1 4w 1AA R70 71 VRD B12EF106J Resistor 1OM ohm 1 4W R 4X55 R 4X55B 2 AA R72 VRN B12EK683J Resistor R73 68k ohm F 1 4W R 4X55 R 4X55B 1AA VRN Bl2EK244F Resistor 1AA R74 VRN B12EK683F 240k ohm F 1 4W R 4X55 R 4X55B Resistor 1AA R75 68k ohm F 1 4W R 4X55 R 4X55B VRN B12EK244F Resistor R76 77 240k ohm F 1 4W R ...

Page 45: ...96WRKO Door assembly complete R 4X55Bl 1BN 5 1 FCORFA226WRTO Door panel R 4H55 R 4X55 1x 5 1 FCORFA229WRTO Door panel R 4X55B 1BG 5 2 GCOVHA233WRFO Choke cover R 4H55 R 4X55 1AK 5 2 GCOVHA228WRFO Choke cover R 4X55B 1AF 5 3 LSTPPA093WRFO Latch head R 4H55 R 4X55 1AF 5 3 LSTPPA090WRFO Latch head R 4X55B 1AF 5 4 MSPRTAl14WREO Spring 1AD 5 5 HPNL A515WREO Door screen R 4H55 R 4X55 1AX 5 5 HPNL A498WR...

Page 46: ...lated steel 4 AA 7 10 XFPSD4OP08KOO Screw M4 x 8 zinc plated steel Australian Model 2 AA XFPSD40P08KOO Screw M4 x 8 zinc plated steel New Zealand Model 3 AA 7 11 XFPSD4OP08000 Screw M4 x 8 zinc plated steel R 4H55 6 AA 7 11 XFPSD40P08000 Screw M4 x 8 zinc 7 12 plated steel R 4X55 R 4X55B 8 AA XHTSD4OP08RVO Screw M4 x 8 zinc plated steel Australian Model 5 AA 7 12 XHTSD40P08RVO 7 13 Screw M4 x 8 zi...

Page 47: ...1 I 2 I 3 I 4 I 5 I 6 OVEN AND CABINET PARTS R 4HSS R 4X55 R 4X55B A B C D E F G H ...

Page 48: ...B A B C D E F G H I 1 I 2 I 3 I 4 I 5 I 6 CONTROL PANEL PARTS aP b 3 5 a 4 DOOR PARTS J e _ z c I Actual wire harness may be different than illustration 1 I 2 I 3 I 4 I 5 I 6 93 SHARP CORP 09KO 75E Printed inAustralia 46 ...

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