Sharp Carousel R-480E Service Manual Download Page 31

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R-480E
R-480E(K)

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.

NOTE: " " indicates components with potentials above 250V.

Figure O-1. Oven Schematic-OFF Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START KEY TOUCHED.

Figure O-2. Oven Schematic-Cooking Condition

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

H. V. FUSE
0.75A

CAPACITOR
1.13

AC2300V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

2ND. INTERLOCK
RELAY CONTROL
SWITCH

MONITOR SWITCH

CONTROL
UNIT

1ST. LATCH
SWITCH

TTM

N.O.

RY-1

COM.

THERMAL
CUT-OUT
145˚C (OVEN)

THERMAL
CUT-OUT 145˚C
(MAGNETRON)

RY-2

MONITOR

RESISTOR

0.8/20W

EARTH

BLU

BRN

230-240V/50Hz

G-Y

FUSE
M10A

LINE CROSS CAPACITOR

0.068

/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022

/AC250V

LINE BYPASS

CAPACITOR

0.0022

/AC250V

AH
SENSOR

2ND.
INTERLOCK
RELAY

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

H. V. FUSE
0.75A

CAPACITOR
1.13

AC2300V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

1ST. LATCH
SWITCH

TTM

N.O.

RY-1

COM.

THERMAL
CUT-OUT
145˚C (OVEN)

MONITOR

RESISTOR

0.8/20W

EARTH

BLU

BRN

230-240V/50Hz

G-Y

FUSE
M10A

LINE CROSS CAPACITOR

0.068

/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022

/AC250V

LINE BYPASS

CAPACITOR

0.0022

/AC250V

AH
SENSOR

2ND. INTERLOCK
RELAY CONTROL
SWITCH

CONTROL
UNIT

N.O.

COM.

THERMAL
CUT-OUT 145˚C
(MAGNETRON)

RY-2

2ND.
INTERLOCK
RELAY

Summary of Contents for Carousel R-480E

Page 1: ... CPU UNIT CIRCUIT 32 PRINTED WIRING BOARD 33 PARTS LIST 34 S7108R480EPJ MICROWAVE OVEN MODELS R 480E R 480E K In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used SHARP CORPORATION SERVICE MANUAL Sensor SENSOR DEFROST COOK HELP SENSOR INSTANT REHEAT S E N S O R C O O K Info Display HELP SOUP CASSEROLE DINNER PL...

Page 2: ...R 480E R 480E K ...

Page 3: ...rbing load attached Never look into an open waveguide or antenna 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 b...

Page 4: ...tes 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 INSTANT REHEAT pads SENSOR COOK pads SLOW COOK pad EXPRESS DEFROST pad EASY DEFROST pad MORE LESS pads QUICK EASY pad NUMBER pads POWER LEVEL ...

Page 5: ...tion of oven during cooking press twice to can cel cooking programme POWER LEVEL PAD Press to select microwave power setting If not pressed HIGH is au tomatically selected INSTANT COOK START PAD Press once to cook for 1 minute on HIGH or increase in 1 minute incre ments each time this pad is pressed during cooking Press to start the oven after setting programmes See NOTE HELP PAD Press to select a...

Page 6: ...t 3 3 volts A C output on the filament winding and high voltage of approximately 2000 volts A C on the secondary winding 2 The filament winding voltage 3 3 volts heats the magnetron filament and the high voltage 2000 volts is sent to the voltage doubling circuit where it is doubled to negative voltage of approximately 4000 volts D C 3 The 2450 MHz microwave energy produced in the magnetron generat...

Page 7: ...veenergyisproducedandfirststageisstarted The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR pad 4 When the sensor detects the vapor emitted from the food thedisplayswitchesovertotheremainingcooking time and the timer counts down to zero At this time the door may be opened to stir food...

Page 8: ...thehighvoltagerectifier or magnetron is shorted THERMAL CUT OUT 145 C OVEN The thermal cut out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control unit Under normal operation the oven thermal cut out remains closed However when abnormally high temperat...

Page 9: ...ect the leads to the primary of the power trans former WARNING TO SERVICE PERSONNEL REMEMBER TO CHECK 4R 1 Reconnect all leads removed from components during 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 turn...

Page 10: ...s properly at HIGH and when 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 starting MAGNETRON POWER TRANSFORMER H V RECTIFIER ...

Page 11: ...ad is as follows Room temperature T0 around 20 C Power supply Voltage Rated voltage Water load 1000 g Initial temperature T1 10 1 C Heating time 36 sec Mass of container mc 330 g T2 Final Temperature P 115 x T 0 55 x mc T2 T0 36 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 ...

Page 12: ...ed a Primary winding approx 1 0 Ω b Secondary winding approx 87 Ω c Filament winding 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 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 volta...

Page 13: ...nal Released Open circuit Short circuit NO Normally open terminal Depressed Short circuit Open circuit NC Normally close terminal If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS F NOISE FILTER TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the noise filter Using an ohmmeter check between the terminals as de scri...

Page 14: ...tors Resistance Fan motor Approximately 250 Ω Turntable motor Approximately 12 2 kΩ If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS CARRY OUT 3D CHECKS 1 If the fuse M10A 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 harness 2 If the fuse M10A is blown when the door is opened check...

Page 15: ... possible M KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable 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 ribbon cable that connects th...

Page 16: ...elay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 APPROX 25 0V D C Oven lamp Turntable motor Cooling fan motor RY2 APPROX 24 0V D C Power transformer CARRY OUT 4R CHECK...

Page 17: ...0 milliliter measuring cup 9 2 Place the container on the center of tray in the oven cavity 9 3 Close the door 9 4 Touch the CLOCK pad once the POWER LEVEL pad twice the START pad once the number pad 1 once and the number pad 4 once 9 5 The control panel is in automatic Sensor operation 9 6 The oven turns off automatically and the time for detecting moisture will be displayed If new sensor dose no...

Page 18: ... the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5V LSI IC1 4 Relay Circuit A circuit to drive the magnetron fan motor turntable motor and light the oven lamp 5 Buzzer Circuit ThebuzzerisresponsivetosignalsfromtheLSItoemit audible sounds key touch sound and completion sound 6 Synchron...

Page 19: ... motor driving signal To turn on and off shut off relay RY1 The squarewaveformvoltageisdeliveredtotheRY1 driving circuit and RY2 control circuit 30 P44 OUT Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cook ing and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L leve...

Page 20: ...erminal to judge the model The signal out of P04 will be input into AIN6 through G4 line on key matrix The LSI will judge the model by this signal 49 AIN5 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 LSI 50 AIN4 IN Used for initial balancing of the bridge circuit absolute humidity sensor This input is an anal...

Page 21: ... 19 123 SEG 21 SEG 38 104 SEG 2 SEG 18 124 SEG 22 SEG 37 105 SEG 3 SEG 17 125 SEG 23 SEG 36 106 SEG 4 SEG 16 126 SEG 24 SEG 35 107 SEG 5 SEG 15 127 SEG 25 SEG 34 108 SEG 6 SEG 14 128 SEG 26 SEG 33 109 SEG 7 SEG 13 129 SEG 27 SEG 32 110 SEG 8 SEG 12 130 SEG 28 SEG 31 111 SEG 9 SEG 11 131 SEG 29 SEG 30 112 SEG 10 SEG 10 132 SEG 30 SEG 29 113 SEG 11 SEG 9 133 SEG 31 SEG 28 114 SEG 12 SEG 8 134 SEG 32...

Page 22: ... absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its AIN5 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistancevalues...

Page 23: ...o check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 4 Servicing Tools Tools required to service the touch control panel assembly 1 Soldering iron 30W It is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or m...

Page 24: ...e transformer High voltagecapacitor Highvoltagerectifierassembly and High voltage fuse 2 Hot parts Ovenlamp Magnetron Highvoltagetransformer and Oven cavity 3 Sharp edge Bottom plate Oven cavity Waveguide 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 In...

Page 25: ...pacitor holder 11 Disconnect the high voltage rectifier assembly from capacitor 12 Now capacitor and rectifier assembly are free CAUTION WHEN REPLACING HIGH VOLTAGE REC TIFIER AND HIGH VOLTAGE CAPACITOR GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL TURNTABLE MOTOR REMOVAL 1 Disconn...

Page 26: ... 3D CHECKS 2 Disconnect the wire leads from the fan motor 3 Remove the fan duct from the oven cavity 4 Remove two 2 screws holding the fan motor to the back plate of the oven cavity 5 Removethefanbladefromthefanmotorshaftaccording to the following procedure 1 Hold the edge of the rotor of the fan motor by using a pair of grove joint pliers CAUTION Make sure that any pieces do not enter the gap bet...

Page 27: ...ith two 2 mounting screws to oven flange 4 Make sure that the monitor switch is operating properly and check continuity of the monitor circuit Refer to chapter Test Procedure and Adjustment procedure 1ST LATCH SWITCH 2ND INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH REMOVAL 1ST LATCH SWITCH 2ND INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT If the 1st latch switch 2nd interlock r...

Page 28: ... and remove it from door frame with releasing latch spring from door frame and latch head 13 Now latch head and latch spring are free 14 Remove the three 3 screws holding the door panel to the door frame 15 Release door panel from nine 9 tabs of door frame by sliding door panel downward 16 Now door panel with sealer film is free 17 Tear sealer film from door panel 18 Now door panel is free 19 Remo...

Page 29: ...zontal 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 Measurement Procedure Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle Thi...

Page 30: ... standardformicrowaveovensmustbeusedfortesting 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 mate...

Page 31: ...145 C MAGNETRON RY 2 MONITOR RESISTOR 0 8 20W EARTH BLU BRN 230 240V 50Hz G Y FUSE M10A N L LINE CROSS CAPACITOR 0 068µ AC250V NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0022µ AC250V LINE BYPASS CAPACITOR 0 0022µ AC250V F1 F2 F3 AH SENSOR 2ND INTERLOCK RELAY POWER TRANSFORMER MAGNETRON H V RECTIFIER H V FUSE 0 75A CAPACITOR 1 13µ AC2300V TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH 1ST L...

Page 32: ...RN RED 2 1 CN B BLU BRN POWER SUPPLY CORD EARTH NEUTRAL LIVE G Y N L WHT RED M10A CONTROL PANEL RY1 N O N O COM COM RY2 CN A CN B T1 1 1 2 2 CPU UNIT POWER UNIT CN F CN C CN G RED ORG ORG W H T OVEN LAMP AND SOCKET BLACK MARK NOTE Neutral WHT wire must be connected to the terminal with black mark on the oven light socket ORG WHT ORG RED THERMAL CUT OUT MAGNETRON BLK ORG MONITOR RESISTOR H V RECTIF...

Page 33: ... 35v C4 10µ 35v R1 2 4k 1SS270A 1SS270A D1 D4 11ES1 D6 R5 4 7k R2 680 1 2w R3 510 1 2w R6 3 3k Q2 2SB1238 SP1 PKM22EPT Q1 2SB1238 RY1 RY2 Q3 KRC243M CN C 12PIN LEAD WIRE HARNESS LED GND VC VA INT VR BUZZER MICRO NC NC OVEN LAMP TURNTABLE MOTOR FAN MOTOR AC AC MICRO 2ND INTERLOCK RELAY CONTROL SWITCH 2ND INTERLOCK RELAY CONTROL SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR C10 C 2 C 3 C 1 C 4 C 9 C 5 ...

Page 34: ...109 144 36 1 COM4 COM3 COM2 COM1 COM0 VL1 VL2 VL3 VL4 VL5 C3 C2 C1 VLIN VREG NC VSS P27 P26 P25 P24 P23 P22 P21 P20 P47 P46 P45 P44 P43 CNTR0 P05 COM6 COM16 COM15 COM14 COM13 COM12 COM11 COM10 COM9 SEG40 SEG39 SEG38 SEG37 SEG36 SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 S...

Page 35: ...H B SH A 1 C3 C4 C5 R3 C2 F C1 10 D4 D2 D1 D3 D9 D10 RY3 CN D D8 ZD1 VRB D U R2 R1 R6 R5 SP1 3 E B D6 D5 Q2 R4 2 6 11 P S RY2 T1 AC VRS1 QKITPB026MRE0 5 D7 OMIF D U 9 8 7 E Q1 B 4 E RY1 AC OL TTM FM B Q3 CN C CN C CN B CN A 1 1 9 12 1 1 1 2 XA VH 2 2 Figure S 4 Printed Wiring Board ...

Page 36: ...1 GCABUA711WRP0 Outer case cabinet R 480E 1 BC 2 1 GCABUA716WRP0 Outer case cabinet R 480E K 1 BH 2 2 FDAI A225WRYZ Bottom plate 1 BB 2 3 GLEGPA074WRE0 Foot 4 AC CONTROL PANEL PARTS 3 1 DPWBFC194WRKZ Power unit New Zealand only 1 BK 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B QCNCMA275DRE0 2 pin connector CN B 1 AB 3 1C FW VZA232DRE0 12 pin harness CN C 1 AE C1 RC KZA087DRE0 Capacitor 0 1µF ...

Page 37: ...OOR PARTS 5 CDORFA927WRKZ Door assembly R 480E 1 BK 5 CDORFA928WRKZ Door assembly R 480E K 1 BK 5 1 FDORFA290WRT0 Door panel 1 BA 5 2 HPNL A692WRR0 Door screen 1 AX 5 3 GWAKPA813WRRZ Door frame R 480E 1 AX 5 3 GWAKPA814WRRZ Door frame R 480E K 1 AX 5 4 GCOVHA382WRF0 Choke cover 1 AM 5 5 PSHEPA336WRP0 Sealer film 1 AF 5 6 LSTPPA139WRF0 Latch head 1 AF 5 7 MSPRTA084WRE0 Latch spring 1 AD 5 8 XEPSD40...

Page 38: ...4 11 7 1 7 4 7 1 4 6 7 6 1 15 7 2 4 9 1 13 7 5 4 1 4 7 1 9 4 4 1 3 1 4 1 3 1 14 1 1 1 11 1 12 7 9 2 3 7 8 2 2 4 15 7 8 2 3 2 3 6 5 4 19 7 1 1 7 1 8 7 1 4 16 4 2 4 17 A A 4 3 1 18 7 5 4 12 4 21 4 10 6 6 1 6 7 7 7 5 1 10 1 2 7 5 7 8 7 1 7 8 7 8 7 1 1 16 4 14 4 13 7 1 7 3 7 1 7 4 1 17 4 22 4 8 6 4 OVEN AND CABINET PARTS ...

Page 39: ...C D E F G H 2 3 4 5 6 1 2 3 4 5 6 CONTROL PANEL PARTS DOOR PARTS Actual wire harness may be different from illustration 6 3 4 18 5 4 5 8 5 8 5 5 5 6 5 1 5 7 5 3 5 2 5 3 1 3 6 3 6 3 6 3 6 3 2 3 3 6 1 3 4 3 5 3 3 1 3 3 3 3 3 2 6 2 MISCELLANEOUS ...

Page 40: ...HEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA317WRK0 PLASTIC BAG SSAKHA032WRE0 Not replaceable items PACKING CASE SPAKCD597WREZ R 480E SPAKCD613WREZ R 480E K BOTTOM PAD ASSEMBLY FPADBA318WRK0 6 8 TURNTABLE TRAY 6 7 OPERATION MANUAL 6 4 TURNTABLE SUPPORT TRAY PACK SPADFA389WRE0 INTO THE OVEN CAVITY CABINET COVER for R 480E K SPAKHA010WRE0 FOAM SHEET SPAKHA013WREZ ...

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