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R-450C

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 ......................................................................................................................................................  6
TEST PROCEDURE .........................................................................................................................................  8
TOUCH CONTROL PANEL ............................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...........................................................  18
MICROWAVE MEASUREMENT ....................................................................................................................  24
WIRING DIAGRAM .........................................................................................................................................  25
PICTORIAL DIAGRAM ...................................................................................................................................  26
POWER UNIT CIRCUIT .................................................................................................................................. 27
CPU UNIT CIRCUIT ........................................................................................................................................ 30
PRINTED WIRING BOARD ............................................................................................................................. 30
PARTS LIST ...................................................................................................................................................  32

S7906R450CPJ/

MICROWAVE OVEN

MODEL

R-450C

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

Info Display

DINNER

PLATE

PASTA MEAL

FROZEN DINNER

CASSEROLE

SOUP

PIZZA

VEGETABLES

MEAT

POWER

LEVEL

LESS

MORE

STOP

CLEAR

INSTANT COOK

START

CLOCK

TIMER

RICE/PASTA

EASY DEFROST

BEVERAGE

PIE

CONVENIENCE MEALS

REHEAT MENU

1

2

3

4

5

6

7

8

9

0

HELP

SENSOR DEFROST

COOK

HELP

1
2
3
...
»

Summary of Contents for R-450C

Page 1: ...WER UNIT CIRCUIT 27 CPU UNIT CIRCUIT 30 PRINTED WIRING BOARD 30 PARTS LIST 32 S7906R450CPJ MICROWAVE OVEN MODEL R 450C 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 Info Display DINNER PLATE PASTA MEAL FROZEN DINNER CASSEROLE SOUP PIZZA VEGETABLES MEAT POWER LEVEL LESS MO...

Page 2: ...R 450C ...

Page 3: ...d 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 be carried...

Page 4: ...imer 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 CONVENIENCE MEALS pads REHEAT MENU pads INFORMATION COOK pads MORE LESS pads NUMBER pads POWER LEVEL pad CLOCK pad TIMER pad STOP CLEAR...

Page 5: ...g programme POWER LEVEL PAD Press to select microwave power setting If not pressed HIGH is au tomatically selected INSTANT COOK START PAD Press to start the oven after setting programmes Press once to cook for 1 minute on HIGH or increase in 1 minute increments each time this pad is pressed during cooking HELP PAD Press to select auto start infor mation guide on and off child lock or demonstration...

Page 6: ...ICROWAVE COOKING CONDITION HIGH COOKING Enter a desired cooking time with the touching Number pads and start the oven with touching START pad Function sequence Figure O 2 on page 25 CONNECTED COMPONENTS RELAY Oven lamp Fan motor Turntable motor RY1 Power transformer RY2 1 Rated voltage is supplied to the primary winding of the power transformer The voltage is converted to about 3 3 volts A C outpu...

Page 7: ... is pushed the latch lever is moved upward operating the latch heads The latch head is moved upward and re leased from the latch hook Now the door can be opened will open at 145 C causing the oven to shut down The defective thermal cut out must be replaced with new one FUSE M10A 1 If the wire harness or electrical components are short circuited this fuse blows to prevent an electric shock or fire ...

Page 8: ...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 9: ...n does not seems to be operating 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 MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR 1ST LATCH SWITCH 2ND LATCH SW...

Page 10: ...water 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 38 sec P 110 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 ove...

Page 11: ... HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three windings The following readings should be obtained a Primary winding approx 1 2 Ω b Secondary winding approx 93 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...

Page 12: ... 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 scribed in the following tabl...

Page 13: ...e table below Table Resistance of Motor Motors Resistance Fan motor Approximately 295 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 M...

Page 14: ...r 2 3 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not 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...

Page 15: ...s 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 OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Check supply voltage and oven power cord Pin No 1 of the 2 pin connector A and the common terminal of the relay RY1 2 The rated AC voltage is present to pri...

Page 16: ...ower is supplied 2 Indicator Circuit This circuit consists of 40 segments and 16 common electrodes using a Liquid Crystal Display The Liquid Crystal Display LCD is drived by LCD driver IC3 3 Power Source Circuit This circuit generates voltages necessary in the con trol unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the c...

Page 17: ... AN10 AN11 P41 and P42 terminal while one of G4 line keys on key matrix is touched 9 P15 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to AN9 AN10 AN11 P41 and P42 terminal while one of G3 line keys on key matrix is touched 10 P16 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to AN8 AN9 AN10 AN11 P41 and P42 terminal while one...

Page 18: ...ed 87 P41 IN Signal similar to AN10 When either G13 line on key matrix is touched a corresponding signal will be input into P41 88 P42 IN Signal similar to AN10 When either G12 line on key matrix is touched a corresponding signal will be input into P42 89 IRQ0 IN Signal synchronized with commercial power source frequency This is the basic timing for time processing of LSI 90 AVCC IN A D converter ...

Page 19: ...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 approx 1M ohm TOUCH CONTROL PANEL SERVICING both ends of the door sensing switch on PWB of the...

Page 20: ...ansformer 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 Insert...

Page 21: ...e rectifier assembly to the capacitor holder 10 Remove the capacitor 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 HIG...

Page 22: ...connect 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 betweentherotorandt...

Page 23: ...pper position The 2nd latch switch is in the lower position at the back side of the latch hook 2 Re connect wire leads to each switch Refer to pictorial diagram 3 Secure latch hook with 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 TestProcedure and Adjustmentprocedure 1ST LATCH SWITCH 2ND...

Page 24: ...tch 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 Remove door screen from door frame as follows 1 Turn the door frame over Refer to Figure 1 2 Push the lower right corn...

Page 25: ...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 This function does not require that doo...

Page 26: ...irement for instrumentations as prescribed by the performance 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...

Page 27: ...OM A1 THERMAL CUT OUT 145 C OVEN RY 2 2ND LATCH SWITCH 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 POWER TRANSFORMER MAGNETRON H V RECTIFIER H V FUSE 0 75A CAPACITOR 1 13µ AC2300V TURNTABLE MOTOR FAN MOTOR OVEN LAMP STOP SWITCH MONITOR SWITC...

Page 28: ...ORG BLK ORG RED RED GRY 2 1 CN A GRN GRY 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 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 MAGNETRON TEMPERATURE FUSE OVEN ...

Page 29: ...0µ 35v C2 1000µ 35v C4 10µ 35v 1SS270A 1SS270A D1 D4 11ES1 D6 R5 4 7k R3 390 1 2w R2 510 1w R6 3 3k Q2 2SB1238 SP1 PKM22EPT RY1 RY2 Q3 KRC243M CN C 12PIN LEAD WIRE HARNESS LED GND VC VA INT VR BUZZER MICRO NC NC STOP SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR AC AC MICRO STOP SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR C10 C 2 C 3 C 1 C 4 C 9 C 5 C 6 C 7 C 8 C11 C12 A 2 B 2 B 1 NO NO COM COM ...

Page 30: ...Z4 3B R12 15k R11 15k J10 J11 4 7k J13 4 7k J15 4 7k J17 4 7k J12 J14 J16 Q30 DTA143EKA Q11 DTA143EKA Q20 DTA143EKA Q21 DTA123JKA D20 1SS355 D41 1SS355 LD10 LD19 LD18 LD17 LD11 LD12 LD16 LD15 LD14 LD13 CF1 CST4 00MGW R78 270k R79 270k R77 270k R76 270k R75 270k R74 270k R41 15k 1 30 31 50 51 80 81 100 R68 15k R69 15k R70 15k R71 15k R72 15k R73 15k C93 4 7k Q10 2SA1037AK R10 1k R80 1M R66 15k R65 ...

Page 31: ...5 SEG4 SEG3 SEG2 SEG1 COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 VDD NC NC RESET TEST VREF R03 R02 R01 R00 P13 P12 P11 P10 P03 P02 P01 P00 K03 K02 K01 K00 NC NC NC SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG9 1 100 76 75 51 25 IC3 IZA951DR 26 50 R134 15k R132 33k R133 510k R120 4 7k R121 4 7k R122 ...

Page 32: ... 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 ELECTRICAL PARTS 1 1 QFS TA014WRE0 Temp fuse 150 C MG 1 AG 1 2 FPWBFA331WRK0 Noise filter 1 AU 1 3 QSW MA131WRE0 1st latch switch 2nd latch switch Stop switch 3 AG 1 4 QSW MA132WRE0 Monitor switch 1 AH 1 5 RTHM A075WRE0 Thermal cut out 145 C OVEN 1 AN PARTS LIST Note The parts marked may cause undue microwave exposure The pa...

Page 33: ...11ES1 4 AB D5 8 VHD1SS270A 1 Diode 1SS270ATA 4 AA Q2 VS2SB1238 3 Transistor 2SB1238 1 AA Q3 VSKRC243M 3 Transistor KRC243M 1 AB R2 VRS B13AA511J Resistor 510 ohm 1W 1 AA R3 VRD B12HF391J Resistor 390 ohm 1 2W 1 AA R4 VRD B12EF270J Resistor 27 ohm 1 4W 1 AB R5 VRD B12EF472J Resistor 4 7k ohm 1 4W 1 AA R6 VRD B12EF332J Resistor 3 3k ohm 1 4W 1 AA RY1 RRLY A076DRE0 Relay OMIF S 124LM 1 AK RY2 RRLY A0...

Page 34: ...CELLANEOUS 6 1 TSPCNC778WRR0 Rating label 1 AD 6 2 FW VZB122WRE0 Switch harness 1 AP 6 3 FW VZB745WRE0 Main wire harness 1 AU 6 4 FROLPA092WRK0 Turntable support 1 AE 6 5 TLABMA538WRR0 Menu label 1 AF 6 6 PZET A012WRE0 Terminal insulator 1 AB 6 7 TCAUHA214WRR0 K caution label 1 AC 6 8 TINSEA809WRR0 Operation manual 1 AM 6 9 NTNT A095WRE0 Turntable tray 1 AX SCREWS NUTS AND WASHERS 7 1 XHTSD40P08RV...

Page 35: ... 5 4 5 7 1 4 11 7 1 7 4 7 1 4 6 7 5 1 15 7 1 4 21 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 4 6 5 4 8 4 19 7 1 1 7 1 8 7 1 4 16 4 2 4 17 A A 4 3 1 17 7 5 4 12 4 23 4 20 4 10 6 7 1 3 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 6 7 3 4 22 ...

Page 36: ...F G H CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS 6 2 6 6 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 99SHARP CORP 07S0 720E Printed in Australia ...

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