Sharp R-7H11 Service Manual Download Page 21 | Manualshive

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Summary of Contents for R-7H11

Page 1: ...riginal spare parts must be used R016101U I TABLE OF CONTENTS Page FOREWORD 1 CAUTION MICROWAVE RADIATION PRODUCT DESCRIPTION GENERAL INFORMATION 3 OPERATION SERVICING 1 TOUCH CONTROL PANEL ASSEMBLY 24 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 33 MICROWAVE MEASUREMENT PROCEDURE 39 PICTORIAL DIAGRAM 40 CONTROL PANEL CIRCUIT 42 PRINTED WIRING BOARD 43 PARTS LIST PACKING AND ACCESSORIES 2 SHARPC...

Page 2: ... to avoid electrical shock and micro wave radiation hazard RD36102U 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 ...

Page 3: ...R 7H71 R 7H21 ...

Page 4: ... Weight Depth 350 mm 330mm Touch Control System Clock I 00 12 59 Timer 0 99min 99 sec Microwave Cooking Control Repetition Rate HIGH Full power throughout the cooking time MED HIGH approx 70 of Full Power MED approx 50 of Full Power MED LOW DEFROST approx 30 of Full Power LOW I approx 10 of Full Power Convection Temperature Control Range i 40 C 70 C to 250 C SENSOR COOK pad COMPU COOK pad CONVECTI...

Page 5: ... the terminal in the plug which is marked with the letter E or by the earth symbol or coloured green or green and yellow The wire which is coloured blue must connected to the terminal which is marked with the letter N or coloured black The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red OVEN DIAGRAM 1 Ventilation openings 6 Oven lamp...

Page 6: ...ST PAD Touch to defrost meat by en tering weight only i CONVECTION COOKING FUNCTION PADS Touch to cook for each func tion r MEMORY PAD Touch to enter one frequent ly used cooking programme Touch to recall the memorized programme i VARIABLE COOKING CON TROL PADS Touch to select microwave power setting If not touched HIGH is automatically selec ted INSTANT COOK START PAD Touch once to cook for 1 min...

Page 7: ...rgy produced by the magnetron is channeled through the waveguide into the cavity feed box and then into the cavity where the food is placed to be cooked Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition When the door is opened during a cook cycle upper latch switch lower...

Page 8: ...and convection motor are de energized At the end of the convection cycle if the cavity air temperature is above 118 C the cir cuit to RY2 will be maintained by the thermistor circuit to continue operation of the cooling fan motor The cavity air temperature drops below 118 C at which time the relay will be de energized turning off the fan motor Relay RY3 will however open as soon as the convection ...

Page 9: ...LEAR pad When the sensor detects the vapor emitted from the food the display switches over to the remaining cooking time and the timer counts down to zero At this time the door may be opened to stir food turn it or season etc When the timer reaches zero an audible signal sounds The shut off relays and micro relay are de energized and the power transformer oven lamp etc are turned off Opening the d...

Page 10: ...5 i I 0 d 7 iz 2 Q EY I ol I c IQ Pci e5 za I z 5 5 z 5s z l l 2s fi 0 gc2 Pz qj g g OBILI EAZ VO W V gg ga z as 03 5 I zt oSid E3b l f 2 L WV0 t f a g t i z3r P x00 aAl i I 32 ammo g3 p z vvov c 6 VI 5 22 P voa G 2 q a s u uoa g z r 8 0 g IL c 6s aa ...

Page 11: ... V RECTIFIER OVEN THERM0 CUT OUT 104 c FAN THERM0 CUT OUT 104 C TEMP FUSE l6O C 1 OWER 1 ATCH SWITCH UPPER LATCH SWITCH SCHEMATIC _ NOTE CONDITION OF OVEN I 1 DOOR CLOSED 2MlX COOKING PAD TOUCHED 3 DESIRED TEMP TOUCHED 4 SrART PAD TOUCHED _ _ __ _ _ _ J d a Q MONITOR RESISTOR MONITOR SWITCH o edow 1 A l w s A 3 CONTROL UN I T Q yY I bn DII 1 L I b CLfii HEATER RELAY m FAN THERM0 CUT OUT lO4 C I TE...

Page 12: ...TDP FUSE 160 C LOWER LATCH SWI TCH OVEN LAW m m CONTROL UN IT I r I A l p p CONTROL UNIT 2 ORANQE WIRE UIVE wST DE CONNECTED TO THE UPPER TERMINAL OF POWER TAAWSFORUER I SCH ATIC NOTE CONOITION OF OVEN I DOOR CLOSED 2 COOKINO TIME PROGRAMME0 3 START PA0 TOUCHED UPPER LATCH 1 SWITCH _ 1 COnVCCT ION MOTOR n u TWTAWF M TOR wrpER LhTCti SWITCH SCHEMATIC NOlE CONOITION OF OVEN 1 DOOR CLOSED 2 CLOCK APP...

Page 13: ... LOTOR HEATER POWER TRhNSFOR ER ASTUlETRfC RECTIFIER FAN THERM CUT WT IM C TEMP FUSE ISO C LOWER LATCH SWI TCH SCHEMATIC _ NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 MIX COOKING PAD TOUCHED 3 DESIRED TEMP TOUCHED 4 START PAD TOUCHED OVEN THERbiO CUT OUT 104 c UPPER LATCIi SW1 TCII O Y 17 WA EARTii NOI 8FIL OVEN LAMP I I CONVECT 1ON MOTDR n L TURNTABLE KITOR ASYMTRIC RECTIFIER SE TER FAN Ttuswl CUT W1 ...

Page 14: ... cuits in the control unit and causes cook time count down to pause MONITOR SWITCH The monitor switch is mounted on the middle of latch hook It is activated the contacts opened by the lower latch head when the door is closed The switch is intended to render the oven inoperative by means of blowing the fuse when the contacts of the upper latch switch and lower latch switch fail to open when the doo...

Page 15: ...t type The temperature in the oven cavity is detected through the resistance of the thermistor and then the control unit causes the heater relay to operate thus the current to the heating element is turned ON OFF DAMPER OPEN CLOSE MECHANISM Usually the damper is in the open position except during convection cooking Damper position is set automatically by damper motor damper switch damper cam and d...

Page 16: ...splay s b G G G Oven lamp does not light with door opened Oven lamp does not light in cook cycle Does light when door is opened OOKING Oven lamp does not light at all CONDTION Oven lamp lights but turntable motor does not operate Cooling fan motor does not operate Oven does not go into a cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced rn oven load ...

Page 17: ...ki c 0 p C 3 0 I 2 0 E 8 z 3 z 0 3 G J id l t 8 a3 n L 5 z E 22 n s c 5 l 8 8 co m z k5 G E 0 2 E 7 Y i Y ki z 0 a n z i5 z E h 3 B 3 4 I I I 7 I 1 I 1 f 1 I 1 7 a fii 2 2 0 t P s 0 P v r 0 c I 4 II 4 I i j z 0 d r 15 ...

Page 18: ...ollows P x t 4 2 V x AT P W 4 2 x V x AT t Our condition for the water ioad is as follows Water load 2000 ml Heating time I 20 seconds P 7Ox 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 I litre and be placed at right and left side by side on the oven shelf 2 Measure the tem...

Page 19: ...ctions the high voltage rectifier is prob ably defective and should be replaced with rectifier ASYMMETRIC RECTIFIER TEST D Isolate the rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the short protector terminals reverse the leads to the short protector terminals and observe meter reading If an infinite resistance is read in both directions the rectif...

Page 20: ...t A continuity check across the thermal cut out terminals should indicate an closed circuit unless the temperature of the oven thermal cut out reaches approximately 104 C The thermal cut out closes automatically at approximately 80 C If im proper operation is indicated replace thermal cut out When the oven thermal cut out opens it indicates overheating of the heater duct Check the convection motor...

Page 21: ...nd 6 a check of contact with an ohmmeter should indicated 3 and 5 contacts are closed Without 12 volts D C applied to the relay coil 1 and 6 an ohmmeter should indicate those contacts are opened If improper operation is indicated replace the relay If proper operation is indicated check for loose on broken wire connections 3 I FliB 5 1 CAL 6 COIL A continuity check of the relay coil should indicate...

Page 22: ...MICRO RELAY 1 Approx 12 V D C 1 Power transformer HEATER RELAY j Approx 12 V D C Heating element TOUCH CONTROL PANEL ASSEMBLY TEST RD82R08U The touch control panel consists of circuits including semiconductors such as LSI ICs etc Therefore unlike conventional microwave ovens proper maintenance cannot be performed with only a voltmeter and ohmmeter In this service manual the touch control panel ass...

Page 23: ...od 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 vapor given of by the spray and turn off before food is properly cooked 8 After 30 minutes if the sensor has not detected the vapor of the food ERRO...

Page 24: ...e properly the problem is with the control unit CHECKING CONTROL UNIT 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector 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 senso...

Page 25: ...he rated voltage is not applied to POWER terminal Check supply voltage and oven power cord of CPU connector CN A I The rated voltage is applied to primary side of power Power transformer or secondary circuit defective transformer j 3 1Check and repair Only pattern at a is broken 1 Insert jumper wire 1 and solder I 4 1Pattern at a and b are broken I 1 Insert the coil RFILNA003DREO between c and I d...

Page 26: ...e in order to compose a basic standard time in the c ock circuit It accompanies a very small error because it works on commercial frequency 4 ACL Circuit A circuit to generate signals resetting the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit noticing sounds key touch sound and completion sound 6 Temperature Measurement C...

Page 27: ...VC Terminal not used Connected to GND 7 IN2 I IN Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI 8 IN1 IN AH sensor input This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the...

Page 28: ...ng signal Square waveform 50l W To turn on and off shut off relay RY4 The square waveform voltage is delivered to the RY4 driving circuit and relays RY3 COOK RELAY and HEATER RELAY control circuit Description Terminal not used Cooling fan motor driving signal To turn on and off shut off relay RY2 L level during both microwave and con vection cooking H level otherwise 1 OFF H GND DUIlng ON cooking ...

Page 29: ...sec OFF L 32 rec k 4 Signal to sound buzzer A Key touch sound B Completion sound C When the temperature of the oven cavity reaches the preset temperature in the pre heating mode or when the preheating hold time 15 minutes is elapsed 0 12 set H GND Signal synchronized with commercial power source frequency This is the basic timing for all time processing of LSI Damper motor relay driving signal To ...

Page 30: ...nto R3 When no key is touched the signal is held at L level I i I T T 35 R2 IN Signal similar to R3 When either one of G 2 line keys on key matrix is touched a corresponding signal will be input into R2 36 Rl IN Signal similar to R3 When either one of G 3 line keys on key matrix is touched a corresponding signal will be input into Rl RO 37 38 IN Signal similar to R3 When either one of G 4 line key...

Page 31: ...UT OUT Segment data signal Signal similar to P17 1 Segment data signal Signal similar to P17 2 Key strobe signal Signal applied to touch key section Apulse signal is input to RO R3 terminal while one of G 5 line keys on key matrix is touched 47 PO7 OUT Digit selection signal Signal similar to P16 48 PO6 OUT 1 Segment data signal Signal similar to Pl7 I 2 Key strobe signal Signal applied to touch k...

Page 32: ... Terminal not used IN 1 Input signal which communicates the door open ciose information to LSI Door closed f i level signal OV Door opened L level signal 5V Connected to GND I Connected to GND i I O OUT 1 Digit selection signal I Signal similar to P16 Description I 1 2 Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 8 line keys on key ...

Page 33: ...t 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 R50 1 Changing the resistance values results in that there is the same potential at troth F 3 ter...

Page 34: ...tact with the oven proper B On some models on the other hand the power supply cord between the touch control panel and the oven proper IS so long that they may be separated from each other For those models therefore It IS allowed to check and repalr 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 on PWBj ...

Page 35: ... 2 If the door is not closed CAUTION DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE DISCHARGE HIGH VO LTAG E CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING RDA1203U OUTER CASE CABINET REMOVAL To remove the outer case and proceed as follows 1 Disconnect oven from power suppply 2 Remove eight 8 screws from the rear and along the side edge of the case 3 Remove two 2 screws LHS...

Page 36: ...CURED Remove one 1 screw holding the H V rectifier FIRMLY WITH A GROUNDING terminal to the capacitor holder SCREW Disconnect the rectifier assembly from the capacitor HIGH VOLTAGE CAPACITOR REMOVAL Disconnect oven from power supply and remove 5 Disconnect high voltage wire lead of capacitor from outer case transformer Discharge the high voltage capacitor Disconnect the high voltage wire leads and ...

Page 37: ... cabinet to heater duct and base cabinet unit angle and chassis support Release tabs of cooling duct assembly holding to rear cabinet And remove rear cabinet Disconnect wire leads from the cooling fan motor OVEN LAMP SOCKET REMOVAL Pull the wire leads from the oven lamp socket by pusnrng tne terminal hole ot the oven lamp socket with the flat type small screw driver Lift up the tab of the oven lam...

Page 38: ...duct and take con motor mounting plate to the heater duct 1G Convection motor mounting plate with convection mtor is free 17 Remove the two 2 screws holding the convection motor to the convection motor mounting angle 17 Convection motor is free UPPER LOWER LATCH SWITCHES STOP SWITCH AND MONITOR SWITCH REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor ...

Page 39: ... 2 The stop and lower latch switches interrupts the circuit before the door can be opened 3 The monitor switch contacts close when the door is opened 4 Re install outer case and check for microwave leakage around the door with an approved micro wave survey meter Refer to Microwave Measure ment Procedure Figure C Z Latch Switches DOOR DISASSEMBLY Remove door assembly refer to Door Replacement Repla...

Page 40: ...ance with proper microwave radiation emission limitation standars The door can be adjusted by keeping the screws of each hinge loose The lower oven hinge can be loos ened with screw driver After adjustment make sure of the following 1 2 3 4 Door latch heads smoothly catch the latch hooks through the latch holes and also the latch head goes through the center of the latch hole Deviation of the door...

Page 41: ...r formance standard for microwave ovens must be used for testing 2 3 4 5 6 Recommended instruments are NARDA 8100 NAR DA 8200 HOLADAY HI 1500 SIMPSON 380M Place the oven tray into the oven cavity Place the load of 275 I 5ml 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 elect...

Page 42: ...i r ch E s I EL 8 5 tL zz i I a I I L I I I 1 I j I 1 1 1 I I I 1 w 3x I 5 i I I e ci c c 3 2 i g i i 3dv1 i 111 j Ij I A 5s 1 B 4 2 r 5 i I I 1 I I I I I I i I D Y 3 uiz z u n m Z Z I I 2 0 a q o 15 lkze 37 r31 I i I I i I E I 5 i Y pq A 0 x zig dl 1r I I r I I I i I i 1 I 11 11oY a P A _ Ez P j i ala r c If I I m Lli OD ON o c 3 LIIclIl 10 7 2q q Y 2z ml e 1 2 3 4 5 6 40 ...

Page 43: ...I G I n t m u 0 m ___ __ _ _ _ _ _ _ __ _______ ___ Y CN F CN I CN A ATTENTION CN F Figure S 2 Pictorial Diagram New Zealand ...

Page 44: ...R 7Hll R 7H21 E 5 I UP 5 D e 1 2 3 4 I 5 6 42 ...

Page 45: ...R 7Hll R 7HU 1 2 3 4 I 5 6 Figure S 4 Printed Writed Board I 1 2 I 3 I 4 5 6 43 ...

Page 46: ...014WREO Heater relay 1 AG 1 AP l 25 l 26 FDTCTA093WRKO AH sensor assembly QFS CAOlOWREO Fuse M8A 1 AY l 27 RFILNA003WREO Noise filter R 7Hll for New Zealand 1 AE 1 28 mbly R Hll for New Zealand CABINET PARTS 2 1 GCABUA271WRPO Outer case cabinet R 7Hll GCABUA283WRPO Outer case cabinet R 7H21 1 AZ 2 2 1 BA 5 i TMAPCA564WRRO Schematic diagram R 7Hll for New Zealand GDAI A075WRWO Base cabinet 1 AC GLE...

Page 47: ... D80 88 D92 99 Fl QFS AA005DREO IC protector ICP NlOS 1 AE ICl RH iZA225DREO LSi IC2 1 AW Ql RH iZ0021WREO IC IR94558 RH TZA035DREO Transistor 2SB793 1 AE Q2OJ0 RH TZA046DREO Transistor DTA143ES 1 AC Q40 6 AB Q84 86 g RH TZA049DREO Transistor DTC114ES RH TZA051DREO Transistor DTD143EA 281 RH TZA047DREO Transistor DTA114YS 282 83 RH TZA097DREO Transistor DTB143ES Rl RR DZ391PDREO Resistor R2 RR DZ3...

Page 48: ...16 FFANJA018WRKO Fan blade assembly 1 AE 4 17 NFANMAOllWRPO Convection fan 1 AD 4 18 NFANMA012WRPO Reflection fan 1 AC 4 19 LANGQA080WRWO Convection motor mounting plate 1 AE 4 20 PFTA A012WRWO Damper 1 AE 4 21 NSFTTA031WRMO Damper shaft 1 AA 4 22 LANGTA128WRWO 4 23 Damper angle 1 AE LANGQA094WRWO Thermal cut out angle 1 4 24 AB PCUSGA137WRPO Damper cushion 1 4 25 AG 4 26 LANGTA123WRWO Chassis sup...

Page 49: ...Latch shaft Q TY 1 1 1 1 1 1 1 1 MISCELLANEOUS LOW rack High rack Thermistor harness Main wire harness R 7H11 7H21 for Australia Main wire harness R 7Hll for New Zealand Purse lock S High voltage wire A High voltage wire B Purse 1ock LL Caution label Cook book Cook book Operation manual R 7Hll Operation manual R 7H21 Name plate R 7Hll for Australia Name plate R 7H2i for Australia Name plate R 7Hll...

Page 50: ...steel 1 Screw M3x10 zinc plated steel 1 Screw M3x15 zinc plated steel 1 Screw M4xlO zinc plated steel 1 Screw M4x 8 zinc plated steel 1 Washer M5x0 6 chrome steel Screw M4x12 chrome plated steel CR 7Hll 4 Screw M4x12 zinc plated steel R 7H21 4 XNASD40 20000 LX EZA037WREO Nut M4x2 0 zinc plated steel Special screw XCPWW3OPlZXSO Screw M3x12 chrome steel DESCRIPTION 1Q TY HOW TO ORDER REPLACEMENT PAR...

Page 51: ...1 I 2 3 4 1 5 8 CABINET PARTS 1 I 2 I 3 4 5 6 R 7Hll R 7H21 49 ...

Page 52: ... 7Hll q 7H21 1 I 2 3 4 5 0 r OVEN PARTS r 1 1 2 3 4 5 1 6 50 ...

Page 53: ...R 7Hll R 7H21 E F G H CONTROL PANEL PARTS DOOR PARTS 0 5 3 1 i 2 3 4 5 6 51 ...

Page 54: ... 1 E 1 2 3 I 4 5 I b MISCELLANEOUS 0 6 I MG WC I PACKING ACCESSORIES HIGH RACK LOW RACK DOOR PROTECTION SHEET lSPAOfV336WREOl PACKING ADD Kll CPADBAOVWRK I PLASTIC BAG CASE 3323WRE0 R 7H7 t J 3368WREO R 7H21 J 3369WRE0 R 7Hl l Z Not Replaceable Items 52 ...

Page 55: ...R 7Hll R 7H21 ...

Page 56: ...R 7Hll R 7H21 RDXI 101 U SHARP 89 0 SHARP CORP 9U0 96E Printed in Australia ...

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