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Sharp R-3H57 Service Manual Download Page 10

R-3H57

8

Home fuse blows when power sup-
ply cord is plugged into wall outlet.

FUSE M8A blows when power
supply cord is plugged into wall
outlet.

Display does not show anything
when power supply cord is plugged
into wall outlet.

Display  does not operate properly
when STOP/CLEAR pad is
touched.

Oven lamp does not light at door
opened. (Display appears.)

Oven does not start when the
START pad is touched.  (Display
appears)

Oven lamp does not light (Display
appears.)

Fan motor does not operate. (Dis-
play appears.)

Turntable motor assembly does
not operate. (Display appears.)

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 or no heat is produced in oven
load. (Microwave power level is
set at HIGH)

Oven does not seems to be oper-
ating properly when MEDIUM
HIGH, MEDIUM, MEDIUM LOW
or LOW is set. (Oven operates
properly at HIGH and then the
STOP/CLEAR pad is touched the
oven stops.)

Oven goes into cook cycle but shuts
down before end of cooking cycle.

Oven stops as soon as when the
START pad is touched.

AH sensor does not end during
Sensor Cooking condition. (Oven
does not shut off after a cup of
water is boiling by sensor cooking.

Oven stops at 16 sec. after start-
ing.

OFF
CONDITION

PROBLEM

CONDITION

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

TEST PROCEDURE

ON
CONDITION

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

1ST. LATCH SWITCH

2ND. LATCH SWITCH

STOP SWITCH

MONITOR SWITCH

MONITOR RESISTOR

TEMPERATURE FUSE 95˚C

THERMAL CUT-OUT 145˚C

FAN MOTOR

TURNTABLE MOTOR

FUSE M8A

TOUCH CONTROL PANEL

KEY UNIT

RELAY (RY-1, RY-2)

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

OVEN LAMP OR SOCKET

WALL OUTLET

MISADJUSTMENT SWITCH

HOME FUSE OR BREAKER

BLOCKED COOLING FAN

BLOCKED VENTILATION

NOISE FILTER (FOR N.Z.)

AH SENSOR

CK = Check / RE = Replace

A B C D E E E E G F F H   H I J K L M

 RECK CKRECK CKCKCKCK

N O

SENSOR
COOKING
CONDITION

Summary of Contents for R-3H57

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 33 CONTROL PANEL CIRCUIT 35 PRINTED WIRING BOAR...

Page 2: ...R 3H57 ...

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: ... 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 LOW approx 30 of Full Power LOW approx 10 of Full Power HELP pad SENSOR COOK pads SENSOR INSTANT ACTION pads NUMBER pads POWER LEVEL pad EASY DEFROST pad MEMORY pads MORE LES...

Page 5: ...g If not pressed HIGH is automatically selected EASY DEFROST PAD Press to defrost meat by entering weight MORE LESS PADS Press to increase decrease the time in one minute increments during cooking or to alter the doneness for the Convenience Meals or Information Cook modes STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven during cooking press twice to cancel coo...

Page 6: ... switch COM NO Closed Open The circuits to the power transformer fan motor and turntable motor are cut off when the 1st latch switch 2nd 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 remaining time 6 MONITOR SWITCH CIRCUIT The monitor swi...

Page 7: ...dition DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel refer to the Figure D 1 When the open button is pushed the open button pushes up the switch lever and then the switch lever pushes up the the latch head The latch heads are moved upward and re leased from latch hook Now the door will open LATCH HEADS LATCH HOOK 2ND LATCH SWITCH MONITOR SWITCH SWITCH LEVER...

Page 8: ...y interference that might flow back in the power circuit The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1 7 KV D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage The process of blowing the fuse M8A ...

Page 9: ...arry 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 c...

Page 10: ...ates properly at HIGH and then the STOP CLEAR pad is touched the oven stops Ovengoesintocookcyclebutshuts down before end of cooking cycle Oven stops as soon as when the START pad is touched AH sensor does not end during Sensor Cooking condition Oven does not shut off after a cup of water is boiling by sensor cooking Oven stops at 16 sec after start ing OFF CONDITION PROBLEM CONDITION POSSIBLE CAU...

Page 11: ...ws 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 approximat...

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: ...ulty and should 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 ...

Page 14: ...hort 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 capacitor shows an infinite resistance G The resistance across all the terminals and the chassis must be i...

Page 15: ...INDING TEST Table Resistance of Motor Motors Resistance Fan motor Approximately 370 Ω Turntable motor Approximately 16 08 kΩ If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS I BLOWN FUSE F M8A CARRY OUT 3D CHECKS 1 If the fuse M8A is blown there could be shorts or ground in electrical parts or wire harness Check them and replace the defective parts or repair the wire harnes...

Page 16: ...roper temperature measurement is not obtained K KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat...

Page 17: ...with a fine foil pattern added to the primary on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS STEPS OCCURANCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at Check supply voltage and oven power cord POWER terminal of CPU connector CN A 2 The ...

Page 18: ...s with food at normal storage temperature For example chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings The sensor will detect the vapour given of by the spray and turn off before food is properly cooked 8 If the sensor has not detected the vapour of the food ERROR will...

Page 19: ...move outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector that is mounted to lower portion of control panel 5 Then connect the dummy resistor circuit see fig to the sensor connector of control panel 6 Reconnect the oven to the power supply and check the sensor cook operation proceed as follows 6 1 Touch Reheat Beverage ...

Page 20: ...d and anode voltage VF1 2 2Vac Filament of fluorescent display tube VF2 VF1 to VF2 voltage TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It incorporates a very small error because it works on commercial frequency 4 ACL Circuit A circuit to g...

Page 21: ...T IN Connected to VC 21 X2 OUT Terminal not used 22 X1 IN Connected to GND 23 VSS IN Power source voltage 5V VC voltage of power source circuit input 24 OSC1 IN Internal clock oscillation frequency input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to OSC1 terminal 25 OSC2 OUT Internal clock oscillation frequency control output Output...

Page 22: ...obe signal Signal applied to touch key section A pulse signal is input to P70 P73 terminal while one of G3 line keys on key matrix is touched 36 P43 OUT Segment data signal Signal similar to P46 Key strobe signal Signal applied to touch key section A pulse signal is input to P70 P73 terminal while one of G4 line keys on key matrix is touched 37 P42 OUT Segment data signal Signal similar to P46 Key...

Page 23: ...ce circuit input 49 55 P60 P66 OUT Segment data signal Signal similar to P46 56 P67 OUT Terminal not used 57 P70 IN Signal coming from touch key When any one of G12 line keys on key matrix is touched a corresponding signal from P40 P46 P57 will be input into P70 When no key is touched the signal is held at L level 58 P71 IN Signal coming from touch key When any one of G11 line keys on key matrix i...

Page 24: ...w 2 Operational Principle of Absolute Humidity Sensor Thefigurebelowshowsthebasicstructureofanabsolute humidity sensor A bridge circuit is formed by two thermistors and two resistors R1 and R2 The output of the bridge circuit is to be amplified by the operational amplifier Each thermistor is supplied with a current to keep it heated at about 150 C the resultant heat is dissipated in the air and if...

Page 25: ...ls 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 ends of the door sensing switch on PWB of the touch control panel with a jumper which ...

Page 26: ...rom power supply 2 Removefour 4 screwsfromrearandtwo 2 screwsalong the right side edge of case OUTER CASE REMOVAL 3 Slide the entire case back out about 1 inch 3 cm to free it from retaining clips on the cavity face plate 4 Lift entire case from the unit CAUTION DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE POWER TRANSFORMER REMOVAL 2 Install the terminal insulator to receptacle of...

Page 27: ...AGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW 1 CARRY OUT 3D CHECKS 2 Disconnect the high voltage of the high voltage rectifier assembly from the power transformer 3 Remove one 1 screw holding capacitor holder to oven cavity rear plate 4 Disconnect rectifier terminal from capacitor Rectifier and high voltage assembly is now free 5 Remove one 1 screw holding high voltage rectifier ass...

Page 28: ...n the rotor and the stator of the fan motor because the rotor is easily 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 disfigure the bracket by touching with the pliers 2 Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand 3 Now the fan blade w...

Page 29: ...avity holding the lamp socket 4 Lift up the oven lamp socket 5 Now the oven lamp socket is free Removal 1 CARRY OUT 3D CHECKS 2 Remove the one 1 screw holding the green yellow wire to the bottom plate right 3 Disconnect the brown wire lead of the power supply cord from the fuse holder 4 Cut away the connector 5 Release the power supply cord from the rear cabinet 6 Now the power supply cord is free...

Page 30: ... following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch hook pushing and pulling lower portion of the door toward the oven face Both results play in the door should be less than 0 5mm 2 The 2nd latch switch and stop switch i...

Page 31: ...he following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approvedmicrowavesurveymeter RefertoMicrowave Measure...

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: ...ARTH BLU BRN 240V 50Hz OL FM TTM N O RY 1 G Y COM FUSE M8A A1 THERMAL CUT OUT 145 C OVEN RY 2 2ND LATCH SWITCH MONITOR RESISTOR 0 8 20W F3 F1 F2 AH SENSOR POWER TRANSFORMER MAGNETRON H V RECTIFIER ASYMMETRIC RECTIFIER CAPACITOR 1 07µ AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LAMP STOP SWITCH MONITOR SWITCH CONTROL UNIT THERMAL CUT OUT 145 MG THERMAL CUT OUT 95 C FAN 1ST LATCH SWITCH B1 B2 A3 OL FM TT...

Page 34: ... COM FUSE M8A A1 THERMAL CUT OUT 145 C OVEN RY 2 2ND LATCH SWITCH MONITOR RESISTOR 0 8 20W F3 F1 F2 AH SENSOR POWER TRANSFORMER MAGNETRON H V RECTIFIER ASYMMETRIC RECTIFIER CAPACITOR 1 07µ AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LAMP STOP SWITCH MONITOR SWITCH CONTROL UNIT THERMAL CUT OUT 145 MG THERMAL CUT OUT 95 C FAN 1ST LATCH SWITCH B1 B2 A5 A3 OL FM TTM N O RY 1 COM A1 THERMAL CUT OUT 145 C OV...

Page 35: ...T HIGH VOLTAGE TRANSFORMER COM NO LSI CN B RY1 CN G RY2 2 1 GRN GRY CN A 1 2 3 4 5 WHT BLK WHT RED GRY ORG BLK RED BLK GRY WHT RED GRY BLK GRY BLACK MARK BLK BLK THERMAL CUT OUT OVEN FAN MOTOR RED BLK WHT GRY CN B CN A WHT WHT BLU BRN POWER SUPPLY CORD EARTH NEUTRAL LIVE GRN GRN BLK 3 1 5 1 ORG GRY GRY STOP SWITCH COM NO GRY GRN G Y WHT WHT THERMAL CUT OUT FAN BLK RED THERMAL CUT OUT MAGNETRON WHT...

Page 36: ... mark on the oven light socket HIGH VOLTAGE TRANSFORMER COM NO CN B 2 1 GRN GRY CN A 1 2 3 4 5 WHT BLK WHT RED GRY ORG BLK RED BLK GRY WHT GRY GRY BLACK MARK BLK BLK THERMAL CUT OUT OVEN FAN MOTOR RED BLK WHT GRY WHT WHT BLU BRN POWER SUPPLY CORD EARTH NOISE FILTER L N M8A NEUTRAL LIVE GRN GRN BLK ORG GRY GRY STOP SWITCH COM NO GRY GRN G Y WHT WHT THERMAL CUT OUT FAN BLK RED THERMAL CUT OUT MAGNET...

Page 37: ...2 15k R41 15k P90 P91 P92 P93 P94 P95 P96 P97 AVCC AN0 AN1 AN2 AN3 AN4 AN5 AN6 AN7 AVSS TEST X2 X1 VSS OSC1 OSC2 RST P10 P11 P14 P15 P16 P47 P77 P76 P75 P74 P73 P72 P71 P70 P67 P66 P65 P64 P63 P62 P61 P60 Vdisp P57 P56 P55 P54 P53 P52 P51 P50 P40 P41 P42 P43 P44 P45 P46 1 32 5 10 20 25 30 33 35 40 45 50 55 60 64 IC1 IZA657DR D48 D47 D46 D45 D44 D43 D42 D41 5 4 3 2 1 0 9 8 7 6 MEMORY 1 MEMORY 2 POW...

Page 38: ... 26 28 IC1 D48 1 12 CN G R72 R44 R43 R41 R42 1 12 IC2 J7 J6 J4 J2 C30 25 J5 C10 SP1 3 1 J3 R30 30 R31 CN F CN B 1 2 D22 R50 D30 DOOR SW LEAD WIRE GREEN 40 33 34 C21 C6 ZD2 LEAD WIRE C45 C46 C47 C48 B E Q60 R48 R47 R46 R45 J13 D60 31 C5 32 C11 35 42 CN D R4 C3 C4 B B E E B E Q22 Q1 B E R2 R3 1 2 J10 J14 J11 39 27 D21 D20 C20 Q21 Q20 B B E E Q10 41 36 D6 D5 C2 C1 D1 T1 C8 R7 D3 D4 J15 R1 D2 S1 S2 P ...

Page 39: ...or CN F 1 AD 3 1D QCNCWA057DRE0 12 pin connector CN G 1 AF 3 1E RV KXA069DRE0 Fluorescent display tube 1 AX C1 RC KZA125DRE0 Capacitor 0 1µF 50V 1 AL C2 VCEAB31VW108M Capacitor 1000µF 35V 1 AF C3 VCEAB31VW106M Capacitor 10µF 35V 1 AB C5 VCEAB31CW476M Capacitor 47µF 16V 1 AA C7 VCKYD11CY103N Capacitor 0 01µF 16V 1 AH C8 VCEAB31CW476M Capacitor 47µF 16V 1 AA C9 RC KZA087DRE0 Capacitor 0 1µF 50V 1 AB...

Page 40: ...275WRE0 Waveguide cover 1 AR 4 10 PCUSGA339WRP0 Cushion 1 AG 4 11 PCUSUA329WRP0 Cushion 1 AC 4 12 PDUC A597WRF0 Air guide 1 AG 4 13 PFILWA041WRE0 Lamp filter 1 AF 4 14 PPACGA084WRF0 TTM packing 1 AF 4 15 LANGQA368WRP0 Fuse angle for Australia 1 AL 4 16 LANGQA343WRP0 Thermal cut out Fan mounting angle 1 AK 4 17 PCUSGA378WRP0 Cushion 1 AL 4 18 PCUSGA388WRP0 Cushion 1 AK 4 19 PCUSUA278WRP0 Cushion 1 ...

Page 41: ...606WRE0 New Zealand BOTTOM PAD ASSEMBLY FPADBA312WRK0 6 2 TURNTABLE TRAY 6 3 OPERATION MANUAL 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA257WRE0 INTO THE OVEN CAVITY SPAKCC591WRE0 Australia SPAKCC607WRE0 New Zealand 6 12 QTANP0020YBE0 Connector for Australia 1 AA 6 13 TCAUHA185WRR0 Micro caution for New Zealand 1 AD 6 14 TGAN A079WRR0 Warrant card for New Zealand 1 AF SCREWS NUTS AND WASHERS 7 1 XFPSD4...

Page 42: ... 8 7 6 7 3 1 9 4 2 7 2 1 5 1 1 7 6 4 6 7 3 1 4 4 10 1 1 1 2 7 5 7 5 4 1 7 1 4 3 7 1 4 4 6 2 6 1 1 7 1 16 6 11 4 7 2 4 7 6 7 5 7 5 2 2 2 4 7 5 2 3 4 9 7 1 1 14 4 14 4 8 4 5 1 10 7 1 1 11 7 4 1 17 7 8 1 10 For New Zealand For Australia 4 18 4 19 7 1 1 9 4 17 x2 1 15 7 3 1 1 7 1 4 15 4 16 1 8 7 2 7 7 A A 7 6 6 13 6 9 1 6 1 18 4 20 7 6 7 2 7 6 4 23 4 24 4 21 4 22 ...

Page 43: ...2 3 A B C D E F G H A B C D E F G H CONTROL PANEL PARTS Actual wire harness may be different than illustration 6 6 6 4 6 12 6 7 6 5 MISCELLANEOUS 3 1 3 2 1 3 3 3 4 3 2 6 10 3 5 3 5 5 2 5 3 5 1 5 5 5 6 5 7 5 4 5 9 5 9 5 8 DOOR PARTS ...

Page 44: ...42 R 3H57 95SHARP CORP 08K0 820E Printed in Australia ...

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