Sharp R-450H, Service Manual

Page 1: ...CH CONTROL PANEL 13 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 18 MICROWAVE MEASUREMENT 24 WIRING DIAGRAM 25 PICTORIAL DIAGRAM 26 POWER UNIT CIRCUIT 27 CPU UNIT CIRCUIT 28 PRINTED WIRING BOARD 29 PARTS LIST 30 S7304R450HPJ MICROWAVE OVEN MODEL R 450H In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used SHAR...

Page 2: ...36 R 450H ...

Page 3: ... 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 be car...

Page 4: ...ve 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 INFOMATION COOK pads CONVENIENCE MEALS pads EXPRESS MENUS pads REHEAT MENU pads MORE LESS pads NUMBER pads POWER LEVEL pad CLOCK pad TIMER pad STOP CLEAR pad INSTANT COOK ...

Page 5: ...Meals menus MORE LESS PADS Press to increase decrease the time in one minute incre ments during cooking or to alter the cooking result for automatic operations NUMBER PADS Press to enter cooking times clock time weight or quantity of food POWER LEVEL PAD Press to select microwave power setting If not pressed HIGH is auto matically selec ted STOP CLEAR PAD Press to clear during pro gramming Press o...

Page 6: ...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 output on the filament winding and high voltage of approximately 2000 volts A C on the secondary wi...

Page 7: ...mal 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 temperature is reached within the oven cavity the oven thermal cut out will open at 145 C c...

Page 8: ...cks and reconnect 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...

Page 9: ...Oven does not seems to be operating properly when MEDIUM HIGH MEDIUM MEDIUM LOW or LOW is set Oven operates 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 MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR 1ST LATCH SWITCH 2ND N D I...

Page 10: ... 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 35 sec Mass of container mc 330 g T2 Final Temperature P 120 x T 0 55 x mc T2 T0 35 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 11: ... 1 0 Ω b Secondary winding approx 84 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 voltage rectifier can be tested ...

Page 12: ...ECKS Disconnect the leads from the terminals of the noise filter Using an ohmmeter check between the terminals as de scribed in the following table 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 If incorrect readings are obtained replace the noise filter unit CARRY OUT 4R CHECKS CARRY OUT 3D CH...

Page 13: ... this service manual the touch control panel assembly is divided into two units Control Unit and Key Unit and also the Control Unit is divided into two units CPU Unit and Power Unit and troubleshooting by unit replacement is described according to the symptoms indicated 1 Key Unit Note Check key unit ribbon connection before replacement The following symptoms indicate a defective key unit Replace ...

Page 14: ...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 CARRY OUT 3D CHECKS M RELAY TEST Remove the outer case and check voltage between Pin No 1 of the 2 pin connector A and the common terminal of the relay RY1 on the power unit with an A C voltmeter The meter should indicate 230 240 volts if not check oven...

Page 15: ...nt to the key unit through P00 P07 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through P14 P17 AIN6 and AIN7 to perform the function that was re quested Control Unit Control unit consists of LSI reset circuit indicator circuit power source circuit relay circuit buzzer circuit synchro nizing signal circuit and back light circuit 1 Reset Circuit Th...

Page 16: ...not used 29 P45 OUT Oven lamp fan motor and turntable motor driving signal To turn on and off shut off relay RY1 The square waveform voltage is delivered to the RY1 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 m...

Page 17: ... P15 46 P14 IN Signal similar to P17 When either G12 line on key matrix is touched a corresponding signal will be input into P14 47 AIN7 IN Signal similar to P17 When either G13 line on key matrix is touched a corresponding signal will be input into AIN7 48 AIN6 IN Input terminal 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 m...

Page 18: ...CD segment LSI signal Pin No LCD segment SEG 39 103 SEG 1 SEG 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 1...

Page 19: ...sible to 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 ty...

Page 20: ...ransformer High voltage capacitor High voltage rectifier assembly and High voltage fuse 2 Hot parts Oven lamp Magnetron High voltage transformer 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 ...

Page 21: ...er 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 Disconnect oven fro...

Page 22: ...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 Remove the fan blade from the fan motor shaft according 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 betwe...

Page 23: ...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 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 ...

Page 24: ...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 Remov...

Page 25: ...gnment from horizontal 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 durin...

Page 26: ... 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 27: ...N THERMAL CUT OUT 145 C MAGNETRON RY 2 EARTH BLU BRN 230 240V 50Hz G Y FUSE F10A N L LINE CROSS CAPACITOR 0 068µ AC250V NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0022µ AC250V LINE BYPASS CAPACITOR 0 0022µ AC250V 2ND INTERLOCK RELAY COM N O NOISE FILTER EARTH BLU BRN 230 240V 50Hz G Y FUSE F10A N L LINE CROSS CAPACITOR 0 068µ AC250V NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0022µ AC250V L...

Page 28: ... ORG RED RED GRY 2 1 CN A GRN 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 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 H V RECTI...

Page 29: ... CN C VC BUZZER 2ND INTERLOCK RELAY CONTROL SWITCH 2ND INTERLOCK RELAY CONTROL SWITCH MICRO J1 C7 NC PKM22EPT C1 R2 510 1W R3 390 1W R6 3 3K C4 10uF 35V C3 R4 27 D5 D6 C10 R5 4 7K C8 C11 NC C1 C9 VR C5 10uF 35V D3 D2 D4 D1 D4 1N4002 x 4 NOTE IF NOT SPECIFIED 1 10W 5 IF NOT SPECIFIED 1SS270A IF NOT SPECIFIED 0 1uF 50V INT VA SP1 Q3 KRC243M GND LED Q2 2SB1238 OVEN LAMP TURENTABLE MOTOR FAN MOTOR OVE...

Page 30: ...SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG40 SEG31 SEG32 SEG33 COM5 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 P41 INT0 P07 P06 15K 4 7K 4 7K C 12 C 8 C 7 C 5 C 6 C 1 C 3 C 4 C 2 C12 0 1uF 50V Q11 DTA143EAK 0 01uF 25V 15K Q1...

Page 31: ... Printed Wiring Board WH 1 SH 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 ...

Page 32: ...tor Interchangeable 1 AX 1 14 RTRN A685WRZZ Power transformer 1 BN 1 15 RV MZA295WRE0 Magnetron 1 BF 1 16 QFS IA002WRE0 H V fuse 0 75A 1 AQ CABINET PARTS 2 1 GCABUA711WRP0 Outer case cabinet 1 BC 2 2 FDAI A225WRYZ Bottom plate 1 BB 2 3 GLEGPA074WRE0 Foot 4 AC CONTROL PANEL PARTS 3 1 DPWBFC345WRKZ Power unit New Zealand only 1 BK 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B QCNCMA275DRE0 2 pin...

Page 33: ...S 5 CDORFA982WRKZ Door assembly 1 BK 5 1 FDORFA290WRT0 Door panel 1 BA 5 2 HPNL A692WRR0 Door screen 1 AX 5 3 GWAKPA910WRRZ Door frame 1 AY 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 XEPSD40P06000 Screw M4 x 6 3 AA MISCELLANEOUS 6 1 TSPCND405WRRZ Rating label 1 AF 6 2 FW VZB752WRE0 Switch harness 1...

Page 34: ... 7 8 2 1 6 8 1 5 4 5 7 1 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 x2 1 16 7 5 4 12 4 20 4 10 6 6 1 6 7 7 7 5 1 10 1 2 7 5 7 8 7 1 7 8 7 8 4 14 4 13 7 1 7 3 4 21 4 8 6 4 ...

Page 35: ...E F G H 2 3 4 5 6 1 2 3 4 5 6 CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS 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 ...

Page 36: ...smitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA317WRK0 PLASTIC BAG SSAKHA032WRE0 Not replaceable items PACKING CASE SPAKCD955WREZ BOTTOM PAD ASSEMBLY FPADBA318WRK0 6 8 TURNTABLE TRAY 6 7 OPERATION MANUAL 6 4 TURNTABLE SUPPORT TRAY PACK SPADFA38...