Sharp R-950A Service Manual Download Page 38

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R-950A

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-Microwave Cooking or Easy Defrost 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

170˚C (CONV.)

NOISE FILTER

MONITOR SWITCH

FUSE M10A

MONITOR RESISTOR 0.8

Ω

/ 20W

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER
SWITCH

THER-
MISTOR

2ND.
INTER-
LOCK
RELAY
CONTROL
SWITCH

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0047

/AC250V

0.22

/AC250V

0.0047

/AC250V

NOISE SUPPRESSION COIL

CONVECTION HEATER

GRILL HEATER

MAGNETRON

POWER
TRANSFORMER

ASYMMETRIC
RECTIFIER

H.V. RECTIFIER

CAPACITOR
1.13

RY4

RY5

RY6

RY1

TEMPERATURE
FUSE 150˚C
(MAGNETRON)

THERMAL CUT-OUT
95˚C (FAN)

THERMAL CUT-OUT
125˚C (GRILL)

220V
50Hz

COM.
(RY1)

E-5

E-4

E-3

E-2

E-1

RY3

N.O.
(RY1)

COM.
(RY3)

COM.
(RY7)

COM.
(RY2)

N.O.
(RY2)

N.O. (RY3)

N.O. (RY7)

A-7

FUSE 20A

RY2

RY7

TTM

1ST. LATCH
SWITCH

2ND.

INTER-

LOCK

RELAY

THERMAL

CUT-OUT

170˚C (CONV.)

NOISE FILTER

MONITOR SWITCH

FUSE M10A

MONITOR RESISTOR 0.8

Ω

/ 20W

OVEN LAMP

FAN MOTOR

E-6

CONTROL UNIT

DAMPER
SWITCH

THER-
MISTOR

2ND.
INTER-
LOCK
RELAY
CONTROL
SWITCH

DAMPER MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

0.0047

/AC250V

0.22

/AC250V

0.0047

/AC250V

NOISE SUPPRESSION COIL

CONVECTION HEATER

GRILL HEATER

MAGNETRON

POWER
TRANSFORMER

ASYMMETRIC
RECTIFIER

H.V. RECTIFIER

CAPACITOR
1.13

RY4

RY5

RY6

RY1

1ST. LATCH
SWITCH

TEMPERATURE
FUSE 150˚C
(MAGNETRON)

THERMAL CUT-OUT
95˚C (FAN)

THERMAL CUT-OUT
125˚C (GRILL)

220V
50Hz

COM.
(RY1)

E-5

E-4

E-3

E-2

E-1

RY3

N.O.
(RY1)

COM.
(RY3)

COM.
(RY7)

COM.
(RY2)

N.O.
(RY2)

N.O. (RY3)

N.O. (RY7)

A-7

FUSE 20A

RY2

RY7

TTM

2ND.

INTER-

LOCK

RELAY

Summary of Contents for R-950A

Page 1: ...OCEDURE 12 TOUCH CONTROL PANEL ASSEMBLY 19 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 24 MICROWAVE MEASUREMENT 30 WIRING DIAGRAM 31 PICTORIAL DIAGRAM 34 CONTROL PANEL CIRCUIT 35 PRINTED WIRING BOARD 36 PARTS LIST 37 HELP AUTO COOK AUTO ROAST AUTO GRILL AUTO BAKE OUTO REHEAT POWER LEVEL EASY DEFROST KITCHEN TIMER STOP CLEAR CLOCK SIMUL GRILL SIMUL CONVEC GRILL CONVEC LESS MORE PREHEAT Info Disp...

Page 2: ... 4 1 10 4 21 1 3 7 19 7 23 x2 7 6 1 21 7 18 2 4 2 3 2 2 3 1 7 22 x2 4 28 7 7 4 16 4 24 4 24 7 29 7 29 4 38 4 6 7 15 4 38 x 5 7 2 6 9 7 2 7 24 4 47 4 34 4 25 x3 4 29 6 4 1 25 2 3 x4 x4 1 11 7 22 7 19 x3 4 5 1 3 6 7 1 20 4 31 A x3 7 1 2 5 7 13 7 5 x4 x9 4 11 4 26 4 27 4 18 4 20 7 9 7 16 4 19 1 9 1 14 7 17 4 17 4 14 4 39 7 16 7 2 4 49 2 2 1 18 2 9 x2 2 8 7 8 x3 4 35 7 8 x3 1 19 7 17 x2 7 17 x2 x2 1 2...

Page 3: ...LANEOUS DOOR PARTS CONTROL PANEL 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 7 18 7 18 3 5 3 4 x 2 3 7 3 3 3 1D 3 1E 3 2 3 2 1 3 2 3 3 2 2 3 6 3 6 3 6 3 1 6 8 ...

Page 4: ...RW0 Rear cabinet 1 AV 2 6 LHLDKA009WRF0 Cord holder 1 AG 2 7 LBNDKA036WRP0 Capacitor holder 1 AG 2 8 FHNG A092WRM0 Oven hinge Lower 1 AF 2 9 PHOK A043WRF0 Latch hook 1 AM CONTROL PANEL PARTS 3 1 CPWBFA757WRK0 Control unit 1 BU 3 1A QCNCMA230DRE0 4 pin connector A 1 AC 3 1B QCNCMA267DRE0 6 pin connector E 1 AC 3 1C QCNCWA057DRE0 12 pin connector G 1 AF 3 1D RV KXA078DRE0 Fluorescent display tube 1 ...

Page 5: ...nel back plate 1 AK 3 4 MLEVFA057WRW0 Open lever 1 AE 3 5 NSFTTA042WRE0 Open shaft 1 AE 3 6 XEPSD30P10XS0 Screw control unit mtg 3 AA 3 7 XCPSD40P12000 Screw control panel back plate mtg 2 AA OVEN PARTS 4 1 FOVN A402WRY0 Oven cavity assembly 1 BV 4 2 FROLPA072WRK0 Turntable support 1 AL 4 3 NTNT A019WRH0 Turntable tray 1 AT 4 4 FBRGMA002WRE0 Bearing ass y 1 AQ 4 5 PREFHA028WRW0 Thermal protection ...

Page 6: ... FW VZB623WRE0 Main wire harness 1 BD 6 6 QW QZA202WRE0 High voltage wire A 1 AK 6 7 TCAUHA054WRR0 Cord caution 1 AE 6 8 TSPCNC517WRR0 Name plate 1 AC 6 9 TCAUHA214WRR0 K caution label 1 AF 6 10 TLABNA224WRR0 Menu label 1 AE 6 11 TINSEA721WRR0 Operation manual 1 AP 6 12 TLABSA061WRR0 M10A label 1 AC SCREWS NUTS AND WASHERS 7 1 XOTWW40P10000 Screw 4mm x 10mm 16 AA 7 2 XOTSE40P12000 Screw 4mm x 12mm...

Page 7: ... NEW No Q ty ability FROM CODE Q3 Q40 Q20 Q23 Transistor VSKRA101M 3 8 VSDTA143ES 3 8 A DEC 97 AB Q90 Q91 Q24 Q25 Transistor VSKRA223M 3 3 VSDTB143ES 3 3 A DEC 97 AC Q27 Q26 Transistor VSKRC243M 3 1 VSDTD143ES 3 1 A DEC 97 AB Q60 Transistor VSKRC101M 3 1 VSDTC143ES 3 1 A DEC 97 AC PACKING AND ACCESSORIES 4 3 TURNTABLE TRAY 6 11 OPERATION MANUAL 6 3 COOK BOOK 4 2 TURNTABLE SUPPORT TRAY PACKING FOAM...

Page 8: ...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 9: ...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 approx 10 of Full Power CONVECTION COOKING FUNCTION Temperature for Variable Cooking CONVECTION 40 to 250 C Temp control SIMUL CONVECTION 230 C with 30 of microwave power GRILL COOKING FUNCTION GRILL Grill cooking SIMUL GRILL Grill cooking with 30 of microwave power HELP pad AU...

Page 10: ...o cook with either function POWER LEVEL PAD Press to select microwave power set ting If not pressed HIGH is automat ically selected NUMBER AND TEMPERATURE PADS Press to enter cooking times clock time or convection temperature STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven during cooking press twice to can cel cooking program HELP PAD Press to select auto star...

Page 11: ...microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle the monitor switch 1st latch switch and 2nd interlock relay control 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 s...

Page 12: ...ng 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 relays RY1 RY5 RY6 are energized turning on the oven lamp turntable motor cooling fan motor and convection motor 3 The shut off relay RY4 is energized The damper door is closed from the open position 4 The power supply voltage is added to...

Page 13: ...y But after the Simul Grill cooking exceeds 20 minutes the RY2 will be de energized automatically turning off the power transformer to protect the oven 4 The ON and OFF time ratio does not correspond withthepercentageofmicrowavepower because approx 2 seconds are needed for heating of the magnetron filament 5 SIMUL means Simultaneous AUTO COOK AUTO REHEAT AUTO COOK AUTO REHEAT will automatically co...

Page 14: ...l to open the fuse M8A blows simultaneously with closing the contacts COM NC of the monitor switch CAUTION BEFORE REPLACING A BLOWN FUSE M8A TEST THE 1ST LATCH SWITCH 2ND IN TERLOCK RELAY MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OP ERATION REFER TO CHAPTER TEST PROCEDURE THERMAL CUT OUT 170 C CONV The thermal cut out protect the convection motor or outer case cabinet against overheating If i...

Page 15: ...6 will be maintained by the thermistor circuit to continue operation of the cooling fan motor until the temperature drops below 118 C at which time the relay will be de energized turning off the fan motor Relay RY5 will how ever open as soon as the convection cycle has ended turning off the convection fan motor This will now cool and allow the damper door to open fan motor is interrupted the air i...

Page 16: ...witch is closed ON position 1 4 The signal of damper switch is re sensed in the control unit and shut off relay RY4 is turned off 1 5 The rated voltage to the damper motor is stopped and the motor turns off 2 When oven is microwave cooking Damper is in the open position 3 When oven is convection cooking 3 1 Dampermotorisenergizedbytouchingtheconvection temperature and START pads 3 2 When damper is...

Page 17: ...O CHECK 3D 1 Disconnect 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 rectifi...

Page 18: ...all outlet Display does not show anything when power cord is first plugged into wall outlet Display does not operate properly when STOP CLEAR pad is touched or the time of day should appear on the display with beep sound during normal condition Oven lamp does not light with door opened Oven lamp does not light at all Oven lamp light but turntable motor does not operate Cooling fan motor does not o...

Page 19: ... 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 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 approximately 190 mm 2 Temperature of the oven and vessel The oven and ...

Page 20: ...ing less than 1Ω If the 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 th...

Page 21: ...r the wire harness 2 If the fuse M10A is blown when the door is opened check the 1st latch switch 2nd interlock relay control switch 2nd interlock relay monitor switch and monitor resistor If the fuse M10A is blown by incorrect door switching replace the defective switch es and the fuse M10A 3 If the fuse M10A is blown there could be short in the asymmetric rectifier or there is a ground in wire h...

Page 22: ...the outer case cabinet has overheated this may be due to resistricted ventilation or cooling fan failure 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 cool completely 1 Resistance of heater Disconnect the wire ...

Page 23: ... replace the noise filter unit FUSE 20A L N LINE CROSS CAPACITOR 0 22µ AC 250V NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0047µ AC 250V LINE BYPASS CAPACITOR 0 0047µ AC 250V NOISE FILTER WHT RED MEASURING POINT INDICATION OF OHMMETER Between N and L Open circuit Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit CARRY OUT 4R CHECKS Thetouchcontrolpanelconsistso...

Page 24: ...spond to the STOP CLEAR pad making momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does not respond it is faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to determine if the control unit or key pad is at fault O KEY UNIT TEST 1 2 3 4 5 6...

Page 25: ...een Pin Check supply voltage and oven power cord No 7 of the 4 pin connector A and the common terminal of the relay RY1 2 The rated voltage is applied to primary Power transformer or secondary circuit defective side of power transformer Check and repair 3 Only pattern at a is broken Insert jumper wire J1 and solder 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d NOTE ...

Page 26: ...ime in the clock circuit It incorporates a 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...

Page 27: ...nputting 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 13 P55 OUT Digit selection signal The relationship between digit signal and digit are as follows Digit signal Digit P03 1st P02 2nd P01 3rd P00 4th P37 5th P36 6th P35 7th P55 8th Normally one pulse is output in every ß period and input to...

Page 28: ...gment data signals The relation between signals and indicators are as follows Signal Segment Signal Segment Signal Segment Signal Segment P23 P1 P16 P6 P12 P10 P06 P14 P22 P2 P15 P7 P11 P11 P05 P15 P21 P3 P14 P8 P10 P12 P04 P16 P20 P4 P13 P9 P07 P13 P46 P17 P17 P5 21 P45 OUT Terminal not used 22 P44 OUT Grill heater driving signal To turn on and off shut off relay RY3 L level during grill cooking ...

Page 29: ...al Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 11 line keys on key matrix is touched 43 P15 OUT Segment data signal Signal similar to P46 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 P46 Key str...

Page 30: ...d 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 on PWB of the touch contro...

Page 31: ...amp Magnetron High voltage transformer and Oven cavity 3 Sharp edge Bottom plate Oven cavity Weveguide flange 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 s...

Page 32: ...hermal protection plate left 5 The heater unit is now free HEATING ELEMENT AND THERMISTOR 1 Remove two 2 screws holding convection heater to heater duct 2 Loosen two 2 screws holding holders to heater duct and take convection heater out of heating element holders 3 Heating element is free 4 Remove two 2 screws holding thermistor to heater duct 5 Thermistor is free HEATER UNIT ASSEMBLY REMOVAL CONV...

Page 33: ...over from the oven cavity by sliding it toward the magnetron 11 Make the tabs of heater mounting plate straight 12 Remove the heater mounting plate grill heaters and the short terminal together from the grill cover 13 Removetheheatermountingplatefromthegrillheating elements 14 Remove two 2 screws holding the short terminal to the grill heaters 15 Now the grill heaters are free 1 CARRY OUT 3D CHECK...

Page 34: ...an blade strongly when installed because the bracket may be transformed Make sure that the fan blade rotates smooth after installed Make sure that the axis of the shaft is not slanted 3 Install the fan duct to the air guide 4 Install the chassis support to the oven cavity with three 3 screws 5 Connect the wire leads to the fan motor and the thermal cut out referring to the pictorial diagram 1 Remo...

Page 35: ...ve control panel assembly refer to Control Panel Removal 3 Disconnect wire leads from each of the switches 4 Remove two 2 screws holding latch hook to oven flange 5 Remove latch hook assembly from oven flange 6 Push downward on the one 1 stopper tabs holding each of the switches place 7 Switches are free At this time switch lever will be free do not lose it If 1st latch switch 2nd interlock relay ...

Page 36: ... its face depressed toward the cavity face plate 4 Re install outer case and check for microwave leakage around the door with an approved microwave survey meter RefertoMicrowaveMeasurementProcedure Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from the oven cavity during the cook cycle This function does not require that the d...

Page 37: ...beusedfortesting 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 such as glass or plastic ...

Page 38: ...RY5 RY6 RY1 TEMPERATURE FUSE 150 C MAGNETRON THERMAL CUT OUT 95 C FAN THERMAL CUT OUT 125 C GRILL 220V 50Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 RY3 N O RY1 COM RY3 COM RY7 COM RY2 N O RY2 N O RY3 N O RY7 A 7 CM DM OL FUSE 20A RY2 RY7 TTM 1ST LATCH SWITCH 2ND INTER LOCK RELAY THERMAL CUT OUT 170 C CONV NOISE FILTER MONITOR SWITCH FUSE M10A MONITOR RESISTOR 0 8Ω 20W OVEN LAMP FAN MOTOR A5 A3 A1 E 6 CONTR...

Page 39: ...RON THERMAL CUT OUT 95 C FAN THERMAL CUT OUT 125 C GRILL 220V 50Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 RY3 N O RY1 COM RY3 COM RY7 COM RY2 N O RY2 N O RY3 N O RY7 A 7 CM DM OL FUSE 20A RY2 RY7 TTM 1ST LATCH SWITCH 2ND INTER LOCK RELAY NOTE Attheinitialperiod therelaysRY3andRY5areenergized and the convection heater and the convection motor are energized until the cavity air temperature reaches 220 C MON...

Page 40: ...TIFIER H V RECTIFIER CAPACITOR 1 13µ RY4 RY5 RY6 RY1 1ST LATCH SWITCH TEMPERATURE FUSE 150 C MAGNETRON THERMAL CUT OUT 95 C FAN THERMAL CUT OUT 125 C GRILL 220V 50Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 RY3 N O RY1 COM RY3 COM RY7 COM RY2 N O RY2 N O RY3 N O RY7 A 7 CM DM OL FUSE 20A RY2 RY7 TTM 2ND INTER LOCK RELAY THERMAL CUT OUT 170 C CONV NOISE FILTER MONITOR SWITCH FUSE M10A MONITOR RESISTOR 0 8Ω 2...

Page 41: ...EATER THERMISTOR HIGH VOLTAGE CAPACITOR POWER TRANSFORMER CONVECTION MOTOR GRN PPL WHT WHT WHT WHT GRY BLK RED WHT WHT N O COM PNK PNK BRN GRY GRY GRY ORG ORG ORG RED RED 2 1 WHT COM N O WHT GRY GRY 1ST LATCH SWITCH MONITOR SWITCH COM N C PPL ORG RY3 RY7 RY2 CN A THERMAL CUT OUT 95 C FAN MOTOR RED PNK 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 N O COM COM COM RY...

Page 42: ...OTOR RY6 RY2 D30 RY3 RY1 R31 4 7k R51 4 7k R62 75kF CF1 4 19MHz C70 330pF x 4 C30 C50 C60 D3 D4 D7 Q4 DTA123ES Q3 KRA101M Q90 KRA101M Q91 KRA101M Q40 KRA101M Q21 KRA101M Q22 KRA101M Q27 KRA223M Q24 KRA223M Q25 KRA223M Q23 KRA101M Q60 KRC101M Q26 KRC243M Q20 KRA101M R10 18 1w CONTROL UNIT C10 0 1µ 50v VP VP F F 8G 31 32 1 2 29 P17 21 R90 100k R94 100k FLUORESCENT DISPLAY TUBE NOTE IF NOT SPECIFIED ...

Page 43: ...13 19 16 17 18 20 21 24 25 E E E E E B B B B B 26 Q27 Q25 Q24 Q21 Q20 J1 RY6 D22 R11 R10 C11 D23 C2 C20 29 C1 C22 27 30 31 28 15 ZD3 J12 J6 R47 R49 R46 C46 C47 R48 C5 C10 C6 C9 J13 J7 J5 J3 J2 J14 J4 10 11 E E E E R94 J10 R93 C70 R75 R76 D28 IC3 R100 IC2 E E Q40 R40 R62 CN E D27 D26 D3 D4 D1 D2 D21 D20 1 P S1 S2 4 5 7 8 D7 3 T1 CN A DAMP M CONV M FAN M POWER 34 VRS1 R3 Q26 Q22 Q23 32 33 RY4 R21 Q1...

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Sharp R-950A, Service Manual

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