Sharp R-980J Page 34 Service Manual Download

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R-980J

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPERARS ON DISPLAY

Figure O-1. Oven Schematic-OFF Condition

Figure O-2. Oven Schematic-High or Easy Defrost or Reheat Sensor Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. START PAD TOUCHED.

NOTE: indicates components with potential above 250V.

THERMAL

CUT-OUT

150˚C (CONV.)

NOISE FILTER

MONITOR SWITCH

MONITOR RESISTOR 0.8

/ 20W

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER
SWITCH

THER-
MISTOR

STOP
SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022µ

/AC250V

0.22µ

/AC250V

0.0022µ

/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER
TRANSFORMER

ASYMMETRIC
RECTIFIER

H.V. RECTIFIER

CAPACITOR
1.13µF
AC2100V

RY4

RY5

RY6

RY1

UPPER LATCH
SWITCH

TEMPERATURE
FUSE 150˚C
(MAGNETRON)

THERMAL CUT-OUT
95˚C (FAN)

230-240V
50Hz

COM.
(RY1)

E-5

E-4

E-3

E-2

E-1

F-3

F-2

F-1

RY3

N.O.
(RY1)

COM.
(RY3)

COM.
(RY2)

N.O.
(RY2)

N.O.
(RY3)

A-9

A-7

FUSE M8A

RY2

TTM

THERMAL CUT-OUT
145˚C (MAGNETRON)

THERMAL

CUT-OUT

150°C (CONV.)

NOISE FILTER

MONITOR SWITCH

MONITOR RESISTOR 0.8

/ 20W

LOWER LATCH SWITCH

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER
SWITCH

THER-
MISTOR

STOP
SWITCH

AH SENSOR

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0022µ

/AC250V

0.22µ

/AC250V

0.0022µ

/AC250V

NOISE SUPPRESSION COIL

CONVECTION

HEATER

MAGNETRON

POWER
TRANSFORMER

ASYMMETRIC
RECTIFIER

H.V. RECTIFIER

CAPACITOR
1.13µF
AC2100V

RY4

RY5

RY6

RY1

UPPER LATCH
SWITCH

TEMPERATURE
FUSE 150°C
(MAGNETRON)

THERMAL CUT-OUT
95°C (FAN)

THERMAL CUT-OUT
145°C (MAGNETRON)

230-240V
50Hz

COM.
(RY1)

E-5

E-4

E-3

E-2

E-1

F-3

F-2

F-1

RY3

N.O.
(RY1)

COM.
(RY3)

COM.
(RY2)

N.O.
(RY2)

N.O.
(RY3)

A-9

A-7

FUSE M8A

RY2

TTM

Summary of Contents for R-980J

Page 1: ...WAVE RADIATION 1 WARNING 1 PRODUCT SPECIFICATIONS 2 GENERAL INFORMATION 2 APPEARANCE VIEW 3 OPERATION SEQUENCE 4 FUNCTION OF IMPORTANT COMPONENTS 7 SERVICING 10 TEST PROCEDURE 12 TOUCH CONTROL PANEL ASSEMBLY 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 26 MICROWAVE MEASUREMENT 31 WIRING DIAGRAM 32 PICTORIAL DIAGRAM 34 CONTROL PANEL CIRCUIT 35 PRINTED WIRING BOARD 36 PARTS LIST 37 INST INSTANT...

Page 2: ...R 980J ...

Page 3: ...rbing load attached Never look into an open waveguide or an tenna while the device is energized 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 ...

Page 4: ...ED approx 50 of Full Power MED LOW DEFROST approx 30 of Full Power LOW approx 10 of Full Power Convection Temperature for Variable Cooking CONVECTION 40 to 250 C Temp control LOW MIX 180 C with 10 of microwave power HIGH MIX 200 C with 30 of microwave power GRILL 250 C Preheat HELP pad SENSOR INSTANT ACTION pads MULTI COOK pad REHEAT SENSOR pad CONVECTION COOKING FUNCTION pads EASY DEFROST pad NUM...

Page 5: ... Press to select microwave power setting If not pressed HIGH is automatically se lected EASY DEFROST PAD Press to defrost meat by entering weight only NUMBER AND TEMPERATURE PADS Press to enter cooking times clock time con vection temperature or to select the Multi Cook menus STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven dur ing cooking press twice to cancel...

Page 6: ...vert to the OFF condition 6 When the door is opened during a cook cycle the monitor switch upper latch switch lower latch switch and stop switch are activated with the following results The circuits to the turntable motor cooling fan motor and high voltage components are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door...

Page 7: ...IX COOKING CONDITION Choose the LOW MIX or HIGH MIX by pressing the LOW MIX pad or HIGH MIX pad And then enter cooking time by pressing the NUMBER pads When the START pad is touched the following operations occur 1 The numbers of the digital read out start the count down to zero 2 The shut off relay RY1 RY5 RY6 energized turning on the oven lamp turntable motor cooling fan motor and convection mot...

Page 8: ...T automatically defrosts roast beef etc When EASY DEFROST is selected and the food weight is entered by using the number pads the oven will cook according to the special cooking sequence Figure O 2 FIRE SENSING FEATURE MICROWAVE MODE This model incorporates a sensing feature which will stop the oven s operation if there is a fire in the oven cavity during microwave cooking This accomplished by the...

Page 9: ...l operation the oven thermal cut out remains closed How ever when abnormally high temperatures are reached within the heater unit the oven thermal cut out will open causing the oven to shut down When the oven has cooled temperature the oven thermal cut out closes THERMAL CUT OUT 95 C FAN MOTOR The thermal cut out protect the fan motor against over heating If its temperature goes up higher than 95 ...

Page 10: ...d by the control unit and shut off relay RY4 is de energized 3 3 The damper is held in the closed position during the convection cooking operation 3 4 At the end of the convection cooking shut off relay beyond the rated peak reverse voltage 1 7 KV in the voltagedoubler circuit 3 D2 of the rectifier is shorted 4 The large electric currents flow through the high voltage winding of the power transfor...

Page 11: ...ven operation after 1 minute Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Sensor cooking OPEN Automatic mix cooking CLOSE Grill cooking CLOSE Slow cooking CLOSE Figure D 2 Damper Mechanism NOISE FILTER The noise filter prevents the radio frequency interference that might flow back in the power circuit DAMPER DUCT DAMPER DAMPER CAM DAMPER MOTOR DAMPER SWITCH DAMP...

Page 12: ...connect the supply 2 Door opened and wedged open 3 Discharge high voltage capacitor WARNING AGAINST THE CHARGE OF THE HIGH VOLTAGE CAPACITOR The high voltage capacitor remains charged about 60 seconds after the oven has been switched off Wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is of the connecting lead of the high voltage rectifier against the c...

Page 13: ... heating element does not heat Temperature in the oven cav ity is lower or higher than preset Convection cycle runs 1 minute then the oven shuts down Convection cycle runs 3 min utes then the oven shuts down Oven is in the sensor cook ing condition but AH sensor does not end 1st stage or does not stop cooking cycle or the oven stops soon MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLT...

Page 14: ...lows Room temperature T0 around 20 C Power supply Voltage Rated voltage Water load 1000 g Initial temperature T1 10 1 C Heating time 47 sec Mass of container mc 330 g T2 Final Temperature T T2 T1 P 90 x T 0 55 x mc T2 T0 47 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 appro...

Page 15: ...reading obtained are not stated as above then the power transformer is probably faulty and should be replaced CARRY OUT 4R CHECKS 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...

Page 16: ...he defective parts or repair the wire harness 2 If the fuse M8A is blown when the door is opened check the upper latch switch lower latch switch monitor switch and monitor resistor If the fuse M8A is blown by incorrect door switching replace the defective switch es and the fuse M8A 3 If the fuse M8A is blown there could be short in the asymmetric rectifier or there is a ground in wire harness A sh...

Page 17: ... circuit An open circuit thermal cut out 150 C CONV indicates that the convection motor has over heated this may be due to convection motor locked An open circuit thermal cut out 95 C FM indicates that the fan motor winding has overheated this may be due to blocked ventilation or locked cooling fan CARRY OUT 3D CHECKS Before carring out the following tests make sure the heater is fully cool 1 Resi...

Page 18: ...r pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal 2 Control Unit The following symptoms indicate a defective control unit Replace the control unit 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 dig...

Page 19: ...ring the control unit to determine if the control unit or key pad is at fault N KEY UNIT TEST O RELAY TEST To protect the electronic circuits this model is provided 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 P PROCEDURES TO ...

Page 20: ...e Sensor works 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 vapor given of by the spray and turn off before food is properly cooked 8 After the oven is started on sensor cooking conditio...

Page 21: ...l 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 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 ...

Page 22: ...very small error because it works on commercial frequency TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 4 ACL Circuit A circuit to generate a signals which resetting the LSI to the initial state when power is applied 5 Buzzer Circuit The buzzer is responds to signals from the LSI to emit noticing sounds key touch sound and completion sound 6 Temperature Measurement Circuit OVEN THERM...

Page 23: ...nal which communicates the door open close information to LSI Door closed H level signal 0V Door opened L level signal 5V 11 AN1 IN Input signal which communicates the damper open close information to LSI Damper opened H level signal 0V GND Damper closed L level signal 5V 12 AN0 IN Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by th...

Page 24: ...zer A key touch sound B Completion sound C When the temperature of the oven cavity reaches the preset tempera ture in the preheating mode or when the preheating hold time 30 min utes is elapsed 24 P42 OUT Timing signal output terminal for temperature measurement OVEN H level GND Thermistor OPEN timing L level 5V Temperature measuring timing Convection cooking 25 INT1 IN Signal to synchronize LSI w...

Page 25: ...o P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 10 line keys on key matrix is touched 44 P14 OUT Segment data signal Signal similar to P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 9 line keys on key matrix is touched 45 P13 OUT Segment data signal Signal si...

Page 26: ...Operational amplifier Output voltage S Thermistor open vessel C Thermistor closed vessel 2 Absolute humidity g m Output voltage Absolute humidity vs output voltage characterist 1 Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration One thermistor is housed in the closed vessel filled with dry air while another in the open vessel E...

Page 27: ... 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 ends of the door sensing switch ...

Page 28: ...e Chassis support and other metallic plate 4 Movable parts to prevent a fault Fan blade Fan motor Switch Switch lever Open button 3 Do not catch the wire leads in the outer case cabinet 4 Insert the positive lock connector certainly until its pin is locked And make sure that the wire leads should not come off even if the wire leads is pulled 5 To prevent an error function connect the wire leads co...

Page 29: ...waveguide with care so the magnetron antenna should not hit by any metal object around the antenna CAUTION WHEN REPLACING THE MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY ASYMMETRIC RECTIFIER AND HIGH VOLTAGE RECTIFIER REMOVAL HIGH VOLTAGE CAPACITOR REMOVAL 1 CARRY OUT 3D CHECKS 2 Disconnect the high voltage wire leads and rectifier assembly...

Page 30: ...R ASSEMBLY REMOVAL REMOVAL 1 CARRY OUT 3D CHECKS 2 Disconnect the wire leads from the fan motor and thermal cut out 3 Remove the three 3 screws holding the chassis support to rear cabinet control panel back plate and waveguide 4 Remove one 1 tab holding the fan duct to air guide 5 Remove the fan motor assembly from the oven cavity 6 Remove the fan blade assembly from the fan motor shaft according ...

Page 31: ...ch lever will be free do not lose it STOP SWITCH UPPER LATCH SWITCH LOWER LATCH SWITCH AND MONITOR SWITCH REMOVAL Re install 1 Re install latch lever and each switch in its place refer to Figure C 1 2 Re connect the wire leads to each switches and fuse holder Refer to the pictorial diagram 3 Secure the latch hook with two 2 mounting screws to the oven flange 4 Make sure that monitor switch is oper...

Page 32: ...owave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards DOOR ADJUSTMENT The door is adjusted by keeping the screws of each hinge loose The lower oven hinge can be loosened After adjustment make sure of the following 1 Door latch heads smoothly catch the latch hook through the latch holes and the latch head goes through the center of the ...

Page 33: ... 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 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 ...

Page 34: ... 13µF AC2100V RY4 RY5 RY6 RY1 UPPER LATCH SWITCH TEMPERATURE FUSE 150 C MAGNETRON THERMAL CUT OUT 95 C FAN 230 240V 50Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 F 3 F 2 F 1 RY3 N O RY1 COM RY3 COM RY2 N O RY2 N O RY3 A 9 A 7 CM DM OL FUSE M8A RY2 TTM THERMAL CUT OUT 145 C MAGNETRON OR THERMAL CUT OUT 150 C CONV NOISE FILTER MONITOR SWITCH MONITOR RESISTOR 0 8 20W LOWER LATCH SWITCH OVEN LAMP FAN MOTOR A5 A...

Page 35: ...GNETRON POWER TRANSFORMER ASYMMETRIC RECTIFIER H V RECTIFIER CAPACITOR 1 13µF AC2100V RY4 RY5 RY6 RY1 UPPER LATCH SWITCH TEMPERATURE FUSE 150 C MAGNETRON THERMAL CUT OUT 95 C FAN 230 240V 50Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 F 3 F 2 F 1 RY3 N O RY1 COM RY3 COM RY2 N O RY2 N O RY3 A 9 A 7 CM DM OL FUSE M8A RY2 TTM THERMAL CUT OUT 145 C MAGNETRON OR THERMAL CUT OUT 150 C CONV NOISE FILTER MONITOR SWI...

Page 36: ...MISTOR HIGH VOLTAGE CAPACITOR POWER TRANSFORMER CONVECTION MOTOR GRN COM N O GRY GRY WHT GRY PPL WHT WHT WHT WHT RED WHT WHT N O COM PNK PNK RED GRY GRY RED RED 2 1 BRN COM N O ORG PNK LOWER LATCH SWITCH MONITOR SWITCH COM N C PPL ORG BLK AH SENSOR RED WHT 1 2 3 CN F 2 RY3 RY2 CN A THERMAL CUT OUT 95ßC FAN MOTOR RED BLK RED GRY R E D WHT R E D R E D RY1 RY6 T1 1 6 5 4 2 3 1 3 5 7 9 N O N O N O COM...

Page 37: ...N THERMISTOR AH SENSOR OVEN LAMP TURNTABLE MOTOR RY6 RY2 D30 RY3 RY1 R31 4 7k R51 4 7k R62 75kF CF1 4 19MHz C70 330pF x 4 A B C C30 C50 C60 D3 D4 D7 Q1 2SB1238 Q4 DTA123ES Q3 KRA101M Q90 KRA101M Q40 KRA101M Q21 KRA101M Q22 KRA101M Q24 KRA101M Q25 KRA101M Q23 KRA101M Q26 KRC243M Q20 KRA101M R10 18 1w CONTROL UNIT C10 0 1µ 50v VP VP F F 8G 31 32 1 2 29 MIX CONV DEFROST SENSOR COOK KG HELP R90 100k I...

Page 38: ... ZD3 ZD4 8 10 11 12 J7 J2 J4 J6 J5 J3 C10 C81 C80 C45 R47 C46 C47 R48 R49 CN D CN G CN G CN F CN E ONLY 9X58PJ C7 C9 C5 C6 C21 C4 C2 C22 C1 R3 C3 C60 C50 C30 R45 R91 R92 R93 R64 R80 R81 R73 D70 D71 D72 D73 D74 D75 D76 D77 R72 R71 R70 R79 R78 R77 R76 R75 R74 R86 J8 R90 R7 R100 R40 DAMP SW DOOR SW OVEN TEMP R50 R51 R31 R30 POWER TRANS POWER OL TTM R62 C20 26 CN A ZD2 R2 D3 D4 D1 D2 Q1 Q23 Q26 Q22 E ...

Page 39: ...1 AK 1 19 RTHM A085WRE0 Thermal cut out 150C Conv 1 AL 1 19 RTHM A099WRE0 Thermal cut out 150C Conv Interchangeable for production use 1 1 19 RTHM A121WRE0 Thermal cut out 150C Conv Interchangeable 1 AK 1 20 RTHM A079WRE0 Thermal cut out 95C Fan 1 AL 1 20 RTHM A111WRE0 Thermal cut out 95C Fan Interchangeable for production use 1 1 20 RTHM A117WRE0 Thermal cut out 95C Fan Interchangeable 1 AK 1 21 ...

Page 40: ...tor 75k ohm F 1 4W 1 AA R63 VRN B12EK101F Resistor 100 ohm F 1 4W 1 AA R64 VRN B12EK222F Resistor 2 2k ohm F 1 4W 1 AA R70 81 VRD B12EF332J Resistor 3 3k ohm 1 4W 12 AA R90 93 VRD B12EF104J Resistor 100k ohm 1 4W 4 AA R100 VRS B13AA331J Resistor 330 ohm 1W 1 AA RY1 3 RRLY A083DRE0 Relay OMIF S 118LM 3 AK RY4 6 RRLY A078DRE0 Relay OJ SS 118LM 3 AG SP40 RALM A014DRE0 Buzzer PKM22EPT 1 AG T1 RTRNPA08...

Page 41: ... 5 AA 5 11 XEBSD30P08000 Screw 3mm x 8mm 11 AA MISCELLANEOUS 6 1 FAMI A088WRM0 Low rack Broiling trivet 1 AW 6 2 FAMI A087WRM0 High rack Baking rack 1 AW 6 3 TCADCA546WRR0 Cook book 1 AZ 6 4 FW VZB635WRE0 Thermistor harness 1 AT 6 5 FW VZB881WREZ Main wire harness 1 BA 6 6 QW QZA202WRE0 High voltage wire A 1 AK 6 7 TINSEB068WRRZ Operation manual 1 AM 6 8 TCAUHA214WRR0 K caution label 1 AF 6 9 TLAB...

Page 42: ...T SPADPA178WRE0 MICROWAVE OVEN TOP PAD ASSEMBLY FPADBA362WRK0 PLASTIC BAG SSAKHA012WRE0 TRAY HOLDER SPADFA348WRE0 BOTTOM PAD ASSEMBLY FPADBA363WRK0 Not replaceable items PACKING CASE SPAKCE142WREZ 1 MODEL NUMBER 3 PART NO 2 REF NO 4 DESCRIPTION HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly please furnish the following information ...

Page 43: ...30 4 7 7 11 4 29 4 1 4 22 4 23 7 11 6 9 7 12 7 25 4 3 4 2 1 5 2 7 7 19 1 1 7 16 7 1 1 8 7 4 1 10 4 21 1 3 7 19 1 9 4 26 4 27 4 18 4 20 7 9 7 16 4 19 1 9 1 14 7 17 4 17 7 23 x2 7 6 1 21 4 40 4 14 7 18 2 4 2 3 2 2 3 1 7 22 x2 4 28 7 7 1 23 4 16 4 24 4 24 7 20 7 20 1 10 4 38 4 6 7 15 4 38 4 39 x 5 7 2 6 8 7 2 4 34 4 25 4 13 x3 6 4 7 16 2 3 x4 x4 1 11 7 22 7 19 x3 4 5 1 3 1 20 4 31 A x3 7 1 2 5 7 13 7...

Page 44: ...4 5 6 1 2 3 4 5 6 CONTROL PANEL PARTS MISCELLANEOUS DOOR PARTS 5 3 5 11 5 1 5 Actual wire harness may be different than illustration 6 4 6 1 6 5 6 6 6 2 5 10 5 10 5 9 5 5 5 4 5 7 5 8 5 6 5 2 5 5 x 2 3 5 3 4 3 7 3 3 3 2 3 2 1 3 2 3 3 2 2 3 6 3 1E 3 1F 3 1 3 6 3 6 7 18 7 18 ...

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Sharp R-980J, Service Manual

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