Sharp R-340A Service Manual Download Page 27

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R-340A

SCHEMATIC

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

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

SCHEMATIC

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

Figure O-2. Oven Schematic-Cooking Condition

Figure O-1. Oven Schematic-OFF Condition

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

CAPACITOR

1.07

AC2200V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

2ND INTERLOCK
RELAY CONTROL
SWITCH

MONITOR SWITCH

CONTROL

UNIT

TTM

N.O.

RY-1

COM.

THERMAL CUT-OUT
125˚C (OVEN)

RY-2

MONITOR

RESISTOR

0.8/20W

EARTH

BLU

BRN

220V 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

H.V. FUSE

0.75 A

NOISE FILTER

2ND
INTERLOCK
RELAY

THERMAL CUT-OUT
95˚C (MG)

1ST. LATCH
SWITCH

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

CAPACITOR

1.07

AC2200V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL

UNIT

THERMAL CUT-OUT
95˚C (MG)

1ST. LATCH
SWITCH

TTM

N.O.

RY-1

COM.

RY-2

MONITOR

RESISTOR

0.8/20W

EARTH

BLU

BRN

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

2ND INTERLOCK
RELAY CONTROL
SWITCH

220V 50Hz

H.V. FUSE

0.75 A

NOISE FILTER

2ND
INTERLOCK
RELAY

THERMAL CUT-OUT
125˚C (OVEN)

Summary of Contents for R-340A

Page 1: ...N 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 28 PRINTED WIRING BOARD 29 PARTS LIST 30 INSTANT ACTION To adjust quantity touch pad again BEVERAGE REHEAT PIE REHEAT PORRIDGE REHEAT PIZZA FRESH VEGETABLES FROZEN VEG...

Page 2: ...R 340A ...

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: ...0 12 59 Timer 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 INSTANT ACTION pads DEFROST pad NUMBER pads POWER LEVEL pad TIMER CLOCK pad STOP CLEAR pad INSTANT COOK START pad Set Weight Approx 17 ...

Page 5: ...STANT COOK START STOP CLEAR 1 2 3 4 5 6 7 8 O 9 NUMBER PADS Press to enter cooking times clock time or weight of food POWER LEVEL PAD Press to select microwave power setting If not pressed 100 is au tomatically selected Press to alter the cooking result for automatic operations STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven during cooking press twice to can c...

Page 6: ...g condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOK ING 1st latch switch COM NO Closed Open 2nd interlock relay control switch COM NO Closed Open Monitor switch COM NC Open Closed The circuits to the power transformer fan motor and turntable motor are cut off when the 1st latch switch and 2nd interlock relay control switch are made open The oven lamp remains on even if the oven d...

Page 7: ...uited this fuse M10A blows to prevent an electric shock or fire hazard HIGH VOLTAGE FUSE 0 75A The high voltage fuse blows when the high voltage rectifier or the magnetron is shorted OVEN THERMAL CUT OUT The thermal cut out located on the top of the oven cavity is designed to prevent damage to the oven by fire If the foods load is overcooked by either error in cook time or defect in the control un...

Page 8: ...nd reconnect the leads to the primary of the power trans former 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 turntable close the door...

Page 9: ...y doesnotoperateprop erly when STOP CLEAR pad is touched Oven lamp does not light at door opened Display ap pears Oven does not start when the START pad is touched Dis play appears Oven lamp does not light Dis play appears Fan motor does not operate Display appears Turntable motor assembly does not operate Display appears Oven or any electrical parts does not stop when cooking time is 0 or STOP CL...

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 42 sec P 100 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: ...he rest of the 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 86 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 ...

Page 12: ...dings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the thermal cut out Then using an ohmmeter make a continuity test across the two terminals as described in the table below CARRY OUT 4R CHECKS Table Thermal cut out Test Temperature of ON condition Temperature of OFF condition Indication o...

Page 13: ...0A is blown by incorrect door switching replace the defective switch s and the fuse M10A CARRY OUT 4R CHECKS CAUTION ONLY REPLACE FUSE M8A WITH THE CORRECT VALUE REPLACEMENT I BLOWN FUSE F M10A J NOISE FILTER TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the noise filter Using an ohmmeter check between the termi nals as described in the following table MEASURING POINT INDICAT...

Page 14: ...ents of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 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 CLE...

Page 15: ...nsformer with a tester for the presence of layer short circuit check the primary coil resistance If any abnormal condition is detected replace the defective parts CARRY OUT 4R CHECKS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST O PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN Remove the outer case and check voltage between Pin No 3 of the 2 pin connector A ...

Page 16: ...en lamp 5 Buzzer Circuit The buzzer is responds to signals from the LSI to emit audible sounds key touch sound and completion sound 6 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 7 Door Sensing Switch A switch to tell the LSI i...

Page 17: ...23 P43 OUT Terminal not used 24 INT0 IN Signal synchronized with commercial power source frequency Thisisthebasictimingfortimeprocessing of LSI 25 P41 OUT Terminal not used 26 P40 IN Connected to VC 27 RESET IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is applied Temporarily set to L level the moment power is applied at this time the LSI is reset Thereaft...

Page 18: ...Pin No LSI signal Pin No LCD Pin No P13 45 S16 25 SEG 13 59 S20 12 P12 46 S15 24 SEG 11 61 S21 11 P11 47 S14 23 SEG 10 62 S22 10 SEG 24 48 S13 22 SEG 9 63 S23 9 SEG 23 49 S12 21 SEG 8 64 S24 8 SEG 22 50 S11 20 SEG 7 65 S25 7 SEG 21 51 S10 19 SEG 6 66 S26 6 SEG 19 53 S9 18 SEG 5 67 S 4 5 SEG 18 54 S8 17 SEG 3 69 S 3 4 SEG 17 55 S7 16 SEG 2 70 S 2 3 SEG 16 56 S6 15 SEG 1 71 S 1 2 SEG 15 57 S5 14 SEG...

Page 19: ...g 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 on PWB of the...

Page 20: ...he wire leads touch to the following parts 1 High voltage parts Magnetron High voltage transformer High voltage capacitor and High voltage rectifier assembly 2 Hot parts Ovenlamp Magnetron Highvoltagetransformer 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 O...

Page 21: ...eguide flange 6 Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna 7 Now the magnetron is free Re install 1 Re install the magnetron to waveguide flange with the two 2 screws diagonally as shown in Figure C 1 2 Insertthetwo 2 tabsofthechassissupporttotheoven cavity front plate and back plate 3 Re install the chassis support to oven cavity front plat...

Page 22: ...lamp socket Terminal Wire lead Terminal hole Flate type small screw driver Figure C 5 Oven lamp socket TURNTABLE MOTOR REMOVAL 1 Disconnect oven from power supply 2 Remove turntable and turntable support from oven cavity 3 Lay the oven on it s backside Remove the turntable motor cover by snipping off the material in four corner 4 Where the corners have been snipped off bend corner areasflat Noshar...

Page 23: ...ing to the pictorial diagram Coil Gap Rotor Bracket Stator Groove joint pliers Shaft Axis Stator These are the position where should be pinched with pliers Rotor Shaft Table Center of bracket Side View Rear View POWER SUPPLY CORD REPLACEMENT Removal 1 CARRY OUT 3D CHECKS 2 Disconnect the brown and blue wires of the power supply cord from the noise filter 3 Remove the single 1 screw holding the ear...

Page 24: ...t oven from power supply 2 Push the open button and open the door slightly 3 Insertanputtyknife thicknessofabout0 5mm intothe gap between the door stopper and the choke cover to free engaging parts as shown in Figure C 8 4 Try the principles of the lever and lift up the door stopper 5 Now the door stopper is free from the door assembly 6 Release two 2 pins of door panel from two 2 holes of upper a...

Page 25: ...Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment 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 ...

Page 26: ...dformicrowaveovensmustbeusedfortesting 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 suc...

Page 27: ...BLU BRN 220V 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 H V FUSE 0 75 A NOISE FILTER 2ND INTERLOCK RELAY THERMAL CUT OUT 95 C MG 1ST LATCH SWITCH POWER TRANSFORMER MAGNETRON H V RECTIFIER CAPACITOR 1 07µ AC2200V TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH CONTROL UNIT THERMAL CUT ...

Page 28: ... OVEN FAN MOTOR RED BLK WHT GRY WHT WHT WHT BLU BRN POWER SUPPLY CORD EARTH NOISE FILTER M10 A N L NEUTRAL LIVE GRN GRN GRN ORG WHT GRY G Y WHT WHT THERMAL CUT OUT 95 C MG WHT 2 1 WHT RED 3 MONITOR RESISTOR RED GRY NOTE Neutral WHT wire must be connected to the terminal with black mark on the oven light socket WHT RED BLACK MARK CONTROL UNIT RY1 N O COM RY2 RELAY CN B CN A T1 1 1 2 3 CN G IC1 RED ...

Page 29: ... T1 MICRO NOTE IF NOT SPECIFIED 1 4w 5 IF NOT SPECIFIED 1SS270A TURNTABLE MOTOR OVEN LAMP FAN MOTOR AC220V 50Hz 1 WH 1 R4 27 R5 4 7k R3 750 1 2w R6 3 3k SP1 VRS1 C1 0 1µ 50v C5 10µ 35v C2 1000µ 25v J1 D5 D3 D4 D2 D1 a c d b D6 RY1 D7 Jumper 6 150 D8 RY2 J2 Q2 2SA933 D1 D4 11ES1 Q3 KRC243M VR VR VR LD1 LD5 LD1 LD2 LD3 LD4 LD5 A 1 N O COM 2 3 4 ...

Page 30: ...1 0 9 8 7 6 P14 45 P13 46 P12 47 P11 1 VL2 2 VL1 3 AN7 4 AN6 5 AN5 6 AN4 7 AN3 8 AN2 9 P61 10 P60 11 P57 12 P56 13 P55 14 P54 15 P53 16 P52 17 P51 18 P50 19 P47 20 P46 21 P45 22 P44 23 P43 24 26 P40 25 P41 VL3 VCC G12 C 2 C 3 C 4 C 5 C 6 C 7 C 8 C 9 C 1 NC GND VC INT BUZZER RY1 RY2 NOTE IF NOT SPECIFIED 1 10W 5 DOOR SWITCH G11 G10 G 9 G 8 G 7 G 6 G 5 G 4 G 3 G 2 G 1 IF NOT SPECIFIED 1SS355 IF NOT ...

Page 31: ...0 LD1 LD2 LD3 LD4 LD5 WH 1 SH A GREEN SH B R2 J4 Q2 Q1 C5 T1 6 1 1 3 3 7 4 4 RY1 RY2 HVT DU DU OMIF OMIF AC COM OL FM AC VH XH 1 3 1 3 CN A TTM 1 E E R4 D6 D5 C4 B B 1 1 1 2 2 DIP CN C 9 R5 R1 ZD1 CN B DOOR SW C3 R6 SP1 D7 Q3 J3 J2 J1 6 7 C1 D4 D2 D1 D3 C2 B E R3 D9 D8 VRS1 RY3 LOT NO F 2 3 4 5 1 2 WH 1 ...

Page 32: ...nnector CN A 1 AD 3 1B QCNCMA275DRE0 2 pin connector CN B 1 AB 3 1C QCNCMA422DRE0 9 pin connector CN C 1 AF 3 1D FW VZA196DRE0 Lead wire harness WH 1 1 AD 3 1E LHLD A171WRF0 LED holder 1 AE C1 RC KZA087DRE0 Capacitor 0 1µF 50V 1 AB C2 VCEAB31EW108M Capacitor 1000µF 25V 1 AE C5 VCEAB31VW106M Capacitor 10µF 35V 1 AA D1 4 VHD11ES1 1 Diode 11ES1 4 AB D5 8 VHD1SS270A 1 Diode 1SS270ATA 4 AA LD1 5 VHPSLZ...

Page 33: ...PA382WRE0 Sealer film 1 AH 5 3 GWAKPA505WRR0 Door frame 1 AY 5 4 HPNL A673WRR0 Door screen 1 AT 5 5 GCOVHA370WRF0 Choke cover 1 AM 5 6 LSTPPA139WRF0 Latch head 1 AF 5 7 MSPRTA084WRE0 Latch spring 1 AB 5 8 XCPSD40P08000 Screw 4mm x 8mm 1 AA 5 9 XCPSD40P08WN2 Screw 4mm x 8mm 1 AC MISCELLANEOUS 6 1 FROLPA079WRK0 Turntable support 1 AQ 6 2 NTNT A084WRE0 Turntable tray 1 AR 6 3 FW VZB602WRE0 Main wire ...

Page 34: ... 4 18 7 2 4 16 7 3 1 5 7 6 6 2 7 3 1 1 1 1 4 1 1 15 4 8 1 7 4 4 7 5 7 6 7 1 7 5 6 5 4 3 7 6 6 1 7 1 7 1 1 9 1 5 4 6 1 8 4 17 1 4 4 7 4 12 4 14 1 12 7 1 x2 4 13 4 2 4 15 1 14 7 3 1 16 4 15 2 3 4 5 1 3 1 2 1 6 1 17 7 1 7 6 7 5 7 6 7 6 2 5 2 4 7 5 2 4 7 3 2 2 4 11 4 9 4 10 1 13 7 1 7 3 1 11 1 10 6 7 7 6 7 1 6 9 ...

Page 35: ... 3 A B C D E F G H A B C D E F G H CONTROL PANEL PARTS DOOR PARTS 5 2 5 8 5 5 5 1 5 3 5 7 5 Actual wire harness may be different from illustration 6 3 5 4 5 9 3 4 3 7 3 7 3 7 3 1E 3 1 3 2 3 3 3 6 3 5 3 3 1 4 19 5 6 6 4 MISCELLANEOUS ...

Page 36: ...OOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA311WRK0 PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCC931WRE0 BOTTOM PAD ASSEMBLY FPADBA351WRK0 6 2 TURNTABLE TRAY PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA397WRE0 INTO THE OVEN CAVITY ...

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