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R307KW

12 – 1

R307KW

Service Manual

CHAPTER 12.

CIRCUIT DIAGRAMS

[1] Pictorial Diagram (Figure S-1)

Figure S-1. Pictorial Diagram

GRY

MONITOR

SWITCH

SECONDARY

INTERLOCK

SWITCH

COM

COM

BLK

N.C.

N.O.

N.O.

COM

GRY

GRN

GRN

WHT

THERMAL

CUT-OUT

(OVEN)

DOOR

SENSING

SWITCH

WHT

RED

BLK

TEMPERATURE

FUSE

(MAGNETRON)

RED

GRN

CONTROL

PANEL

WHT

RY1

PRIMARY

INTERLOCK

RELAY

CN-B

2

1

CN-A

N.O.

COM.

T1

3

1

RY2

RED

PNK

RED

CN-A

2

GRY

1

3

CN-B

2

1

GRN

GRY

COM

N.O.

BLK

GRY

WHT

HIGH

VOLTAGE

CAPACITOR

H.V.

RECTIFIER

(RED)

(WHT)

(RED)

HIGH

VOLTAGE

COMPONENTS

MAGNETRON

TURNTABLE

MOTOR

POWER

TRANSFORMER

RED

RED

GRY

GRY

RED

WHT

PNK

GRY

FUSE

FAN

MOTOR

WHT

BLK

PNK

OVEN

LAMP

PNK

GRY

GRN

GRY

L

N

WHT

RED

Power

Supply

Cord

Oven

Cavity

Back

Plate

Screw

Noise

Filter

GRY

GRY

RED

Connect

the

wire

lead

which

has

the

black

case

to

the

terminal

"L"

of

the

noise

filter.

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Summary of Contents for R-307KK

Page 1: ...APTER 12 CIRCUIT DIAGRAMS Parts List SERVICE MANUAL R307KW CONTENTS SHARP CORPORATION This document has been published to be used for after sales service only The contents are subject to change without notice S0601R307KPW MICROWAVE OVEN R 307KK R 307KW MODELS In the interest of user safety the oven should be restored to its origi nal condition and only parts identical to those specified should be ...

Page 2: ...E TEST 8 3 10 Procedure I NOISE FILTER TEST 8 4 11 Procedure J TOUCH CONTROL PANEL ASSEMBLY TEST 8 4 12 Procedure K KEY UNIT TEST 8 5 13 Procedure L RELAY TEST 8 6 14 Procedure M DEFROST TEST 8 6 15 Procedure N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 8 6 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PANEL 9 1 2 DESCRIPTION OF LSI 9 1 3 SERVICING FOR TOUCH CONTROL PANEL 9...

Page 3: ...components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner BEFORE SERVICING Before servicing a...

Page 4: ...h voltage capacitor 4 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord 2 When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage cap...

Page 5: ...he oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically non conductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking ...

Page 6: ...rackets 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 out only by trained service personnel 3 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact th...

Page 7: ... for holding food is less Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of FULL Power P 80 approx 80 of FULL Power P 70 approx 70 of FULL Power P 60 approx 60 of FULL Power P 50 approx 50 of FULL Power P 40 approx 30 of FULL Power P 30 approx 40 o...

Page 8: ...have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter properly grounded and polarized If the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRO...

Page 9: ...NEL NOTE Some one touch cooking features such as MINUTE PLUS are disabled after three minutes when the oven is not in use These fea tures are automatically enabled when the door is opened and closed or the STOP CLEAR pad is pressed ...

Page 10: ...time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the sec ondary interlock switch and primary interlock relay and is mechani cally associated with the door so that it will function in the following sequence a When the door opens from the closed position the primary interlock relay RY2 and secondary interlock switch open thei...

Page 11: ...OVEN TEMPERATURE FUSE 150ºC MAGNETRON THERMAL CUT OUT 145ºC OVEN 120V AC 60 Hz GRN FUSE 20A NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0 22μF AC 250V LINE BYPASS CAPACITOR 0 0033μF AC125V LINE BYPASS CAPACITOR 0 0033μF AC 125V L N NOISE FILTER or NOTE indicates components with potentials above 250V POWER TRANSFORMER RECTIFIER MAGNETRON CAPACITOR 0 91μF AC2100V OVEN LAMP TURN TABLE MOTOR FAN MOTOR...

Page 12: ...rntable motor rotates the turntable located on the bottom of the oven cavity so that the food on the turntable is cooked evenly The turntable may turn in either direction 5 COOLING FAN MOTOR The cooling fan motor drives a blade which draws external cool air This cool air is directed through the air vents surrounding the magne tron and cools the magnetron This air is channelled through the oven cav...

Page 13: ...alled 7 Run the oven and check all functions 1 TROUBLESHOOTING CHART Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected RE CK A B C D E F F G H RE RE CK J CK CK CK K L N I POSSIBLE CASE AND DEFECTIVE PARTS SHORT IN POWER CORD SHORT OR OPENED WIRING MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR TEMPERATURE FUSE o...

Page 14: ...e to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be32 1 to 59 7 F 17 9 to 33 2 C rise in tempera ture If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low ...

Page 15: ...perature fuse Oven or thermal cut out Oven indicates overheating of the oven exchange the temperature fuse or thermal cut out and check inside of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air guide 6 Reconnect all leads removed from components during testin...

Page 16: ...igh voltage capacitor 4 Before performing this test make sure that the secondary interlock switch and the primary interlock relay are operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When th...

Page 17: ... control panel assembly is divided into two units Control Unit and Key Unit and troubleshooting by unit replacement is described according to the symptoms indicated Before testing 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads ...

Page 18: ...ck it open 3 Discharge high voltage capacitor 4 Reconnect all leads removed from components during testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions 12 Procedure K KEY UNIT TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage ...

Page 19: ...ower supply cord after the outer case is installed 15 Run the oven and check all functions 14 Procedure M DEFROST TEST WARNING The oven should be fully assembled before following procedure 1 Place one cup of water in the center of the turntable tray in the oven cavity 2 Close the door touch the DEFROST pad once And then touch the number pad 2 3 Touch the number pad 5 and then touch the start pad 4...

Page 20: ...he primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord 7 Follow the troubleshooting guide given below for repair 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 11 Reconnect...

Page 21: ...ercial frequency 7 Door Sensing Switch A switch to tell the LSI if the door is open or closed 2 DESCRIPTION OF LSI The I O signal of the LSI are detailed in the following table Symbol Voltage Application VSS 5V LSI IC1 Pin No Signal I O Description 1 P50 IN Signal coming from touch key When either G7 line on key matrix is touched a corresponding signal out of P24 P26 and P31 P33 will be input into...

Page 22: ...rce voltage The power source voltage to drive the A D converter in the LSI 52 P11 IN To input signal which communicates the door open close information to LSI Door close H level signal 0V Door open L level signal 5V 53 P10 OUT Terminal not used 54 P33 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P50 P51 P52 and P53 terminal while one of G1 line keys on key m...

Page 23: ...all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is so 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 ov...

Page 24: ...s adjusted accordingly 3 Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosion of...

Page 25: ...t close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and transmission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are...

Page 26: ... capacitor Refer to PICTORIAL DIAGRAM 4 Reinstall outer case and check that oven is operating properly 4 HIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE CAPACITOR AND HIGH VOLT AGE RECTIFIER ASSEMBLY To remove the components proceed as follows 1 Disconnect the power supply cord and remove outer case 2 Open the oven door and block it open 3 Discharge high voltage capacitor 4 Disconnect the high voltag...

Page 27: ...he control unit to the control panel frame And remove the control unit 6 Remove the rubber connector from the long slit on the control panel frame 7 Tear away the graphic sheet from the control panel frame 8 Tear away the membrane switch from the control panel frame 2 REINSTALL 1 Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol 2 Tear the backing pa...

Page 28: ... because the coil may be cut or injured Do not disfigure the bracket by touching with the pli ers 8 Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand 9 Now the fan blade will be free CAUTION Do not re use the removed fan blade because the hole for shaft may be larger than normal 10 Now the fan motor is free 2 INSTALLATION 1 Install t...

Page 29: ...in its place The secondary interlock monitor switches are in the lower position and the door sensing switch is in the upper position 2 Reconnect 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 Test Procedure and Ad...

Page 30: ... latch spring are free 15 Remove door screen from door frame 16 Now door screen is free 2 REINSTALL 1 Re install door screen to door frame 2 Reinstall the latch spring to the latch head Reinstall the latch spring to the door frame Reinstall latch head to door frame 3 Reinstall door panel to door frame by fitting ten 10 tabs of door frame to ten 10 holes of door panel 4 Put sealer film on door pane...

Page 31: ... film as shown in Fig C 7 2 Tear the backing film by pulling the adhesive tape 3 Put the pasted side of the sealer film on the door panel Figure C 7 Sealer film Pin Pin Upper Oven Hinge Upper Oven Hinge Lower Oven Hinge Lower Oven Hinge Slit choke of door panel Choke Cover Sealer film Backing film Adhesive tape ...

Page 32: ...L PANEL WHT RY1 PRIMARY INTERLOCK RELAY CN B 2 1 CN A N O COM T1 3 1 RY2 RED PNK RED CN A 2 GRY 1 3 CN B 2 1 GRN GRY COM N O BLK GRY WHT HIGH VOLTAGE CAPACITOR H V RECTIFIER RED WHT RED HIGH VOLTAGE COMPONENTS MAGNETRON TURNTABLE MOTOR POWER TRANSFORMER RED RED GRY GRY RED WHT PNK GRY FUSE FAN MOTOR WHT BLK PNK OVEN LAMP PNK GRY GRN GRY L N WHT RED Power Supply Cord Oven Cavity Back Plate Screw No...

Page 33: ... T1 D1 D2 D3 D4 D1 D4 1N4002L X 4 NOTE SEG1 SEG3 SEG2 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 COM2 COM1 COM0 B1 DOOR 5V INT BZ COM M C40 GND R4 910 1 2W CN B AC AC AC120V 60HZ G4 G5 G6 G1 LSI UNIT J1 DTA123JS G8 G9 G10 G2 G3 G7 VR R30 3 3K 0 01uF 50V KEY UNIT PA142DR COM1 COM2 COM3 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 P71 P72 AVDD P01 P00 RESET X2 X1 VSS VDD XT2 XT1 IC P53 P52 P51 P50 P02 17 R50 ...

Page 34: ...R307KW 12 3 3 Printed Wiring Board Figure S 3 Figure S 3 Printed Wiring Board ...

Page 35: ... marked may cause undue microwave exposure Parts marked are used in voltage more than 250V 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS INDEX DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA610WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE FPAK A556WRKZ R 307KK FPAK A557WRKZ R 307KW BOTTOM PAD ASSEMBLY FPADBA611WRKZ CABINET COVER for R 307KK SPAKHA011WRE0 FOAM SHEET SP...

Page 36: ... 4 12 2 1 7 1 1 13 1 2 1 7 7 3 1 10 1 9 4 10 7 10 7 10 7 8 4 11 7 5 4 17 7 4 7 10 1 5 1 4 4 2 1 1 1 1 1 11 7 7 7 10 7 3 7 7 6 4 7 11 7 9 7 2 7 2 7 10 7 10 7 10 7 6 1 12 7 8 4 8 1 8 7 10 7 8 1 2 2 3 2 2 4 12 4 6 4 14 7 1 1 3 4 16 4 15 1 6 7 1 6 1 6 2 4 7 2 3 2 3 4 12 2 3 ...

Page 37: ...A288WRE0 BK Magnetron 1 11 RV MZA321WRZZ BH Magnetron Interchangeable 1 11 RV MZA340WRZZ Magnetron Interchangeable for production use 1 12 QFS TA014WRE0 AG Temperature fuse 150deg C Magnetron 1 13 FPWBFA385WRKZ AV Noise filter assembly CABINET PARTS 2 1 GCABUA889WRPZ BF Outer case cabinet R 307KK 2 1 GCABUA883WRPZ BF Outer case cabinet R 307KW 2 2 GDAI A360WRWZ AS Bottom plate 2 3 GLEGPA074WRE0 AC...

Page 38: ...R307KW 4 2 DOOR AND CONTROL PANEL PARTS 3 2 6 6 3 3 3 6 3 2 1 3 2 2 3 4 3 5 3 1 3 7 6 5 5 1 5 3 5 2 5 4 5 5 5 8 5 7 5 6 5 8 ...

Page 39: ...pen button R 307KW 3 4 MSPRCA050WRE0 AB Button spring 3 5 QCNC A014WRZZ AE Rubber connector 3 6 RLCDSA105DRZZ AQ Liquid crystal display 3 7 XEPS730P08XS0 AB Screw 3mm x 8mm DOOR PARTS 5 1 FDORFA364WRTZ AS Door panel 5 2 PSHEPA382WRE0 AH Sealer film 5 3 GWAKPB015WRRZ AX Door frame R 307KK 5 3 GWAKPB017WRRZ AX Door frame R 307KW 5 4 HPNL A854WRRZ AS Door screen R 307KK 5 4 HPNL A859WRRZ AS Door scre...

Page 40: ...78WRP0 1 4 12 AB PDUC A833WRPZ 1 4 8 AM PDUC A853WRWZ 1 4 9 AP PHOK A145WRFZ 1 4 1 AL PPACGA176WREZ 1 4 10 AC PSHEPA382WRE0 2 5 2 AH PSHEPB159WREZ 2 3 2 1 AU PSHEPB160WREZ 2 3 2 1 AU Q QCNC A014WRZZ 2 3 5 AE QFS TA014WRE0 1 1 7 AG 1 1 12 AG QSW KA062DRZZ 2 3 2 2 AQ QSW MA147WRZZ 1 1 1 AG R RC QZA218WRE0 1 1 5 AW RC QZA295WRZZ 1 1 5 AV RLCDSA105DRZZ 2 3 6 AQ RLMPTA082WRZZ 1 1 8 AL RLMPTA085WRZZ 1 1...

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