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R402JWT

11 – 3

3. Hold the chassis support to the oven cavity front plate and the mag-

netron with the two (2) screws.

4. Reconnect the wire leads to the magnetron. Refer to “PICTORIAL

DIAGRAM”.

5. Reinstall outer case and check that the oven is operating properly.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F.

GASKET IS IN PLACE AND MOUNTING SCREWS ARE
TIGHTENED SECURELY.

[6] OVEN LAMP REMOVAL

1. Disconnect the power supply cord and then remove outer case.

2. Open the oven door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the oven lamp.

5. Remove the one (1) screw holding the oven lamp to the magnetron

duct.

6. Remove the oven lamp from the magnetron duct.

7. Now, the oven lamp is free.

Figure C-1. Oven lamp

[7] POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL

1. Disconnect the power supply cord, and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Push the lever of positive lock

connector.

5. Pull down on the positive lock

connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

CONNEC-

TORS TO THE TERMINALS, CONNECT THE POSITIVE
LOCK

SO THAT THE LEVER FACES YOU.

Figure C-2. Positive lock

connector

[8] CONTROL PANEL ASSEMBLY REMOVAL

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 wire leads from panel components.

5. Straighten the nail holding the control panel assembly to the oven

cavity front plate.

6. Slide the control panel assembly upward and remove it.

7. Now, individual components can be removed.

[9] GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT

1. REMOVAL

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. Remove the control panel assembly, referring to chapter of CON-

TROL PANEL ASSEMBLY REMOVAL.

5. Disconnect the ribbon cable of the membrane switch from the con-

trol unit.

6. Remove the back light PWB from the control panel frame.

7. Remove the four (4) screws holding the control unit to the control

panel frame. And remove the control unit.

8. Remove the display window from the control panel frame.

9. Tear away the graphic sheet from the control panel frame.

10.Tear away the membrane switch from the control panel frame.

2. REINSTALLATION

1. Remove remaining adhesive on the control panel frame surfaces

with a soft cloth soaked in alcohol.

2. Tear the backing paper from the new membrane switch.

3. Insert the ribbon cable of the membrane switch into the slit of the

control panel frame.

4. Adjust the upper edge and right edge of the membrane switch to

the small depression on the surface of the control panel frame.

5. Attach the membrane switch to the control panel frame by rubbing

with a soft cloth not to scratch.

6. Tear the backing paper from the new graphic sheet.

7. Adjust the upper edge and right edge of the graphic sheet to the

large depression on the surface of the control panel frame.

8. Attach the graphic sheet to the control panel frame by rubbing with

a soft cloth not to scratch.

9. Insert the ribbon cable into the slit of the control unit.

10.Reinstall the control unit to the control panel frame and hold with

the four (4) screws.

11.Insert and connect the edge of the membrane switch’s ribbon cable

into the connector CN-G.

12.Insert the back light PWB into the square hole.

13.Reinstall the display window to the control panel frame.

Oven lamp

Terminal

Push

Pull down

Lever

Positive lock¨

connector

Summary of Contents for R-402JK-T

Page 1: ...HAPTER 12 CIRCUIT DIAGRAMS Parts List S5601R402JPW MICROWAVE OVEN R 402JK T R 402JW T SERVICE MANUAL R402JWT MODELS CONTENTS SHARP CORPORATION This document has been published to be used for after sales service only The contents are subject to change without notice In the interest of user safety the oven should be restored to its origi nal condition and only parts identical to those specified shou...

Page 2: ...edure H BLOWN MONITOR FUSE 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 ...

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 ...

Page 4: ...gh 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 ca...

Page 5: ...the 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 nonconductive 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: ...oor brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is no 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: ...olding 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 of FULL...

Page 8: ...eptacle is encountered it is the personal responsibility and obligation of the customer to contact a qualified electrician and 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 ...

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: ...he high voltage components are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the pri mary interlock switch and secondary interlock relay and is mechan ically associated with the door so that it will function in the following sequence a When the d...

Page 11: ... MAGNETRON HIGH VOLTAGE CAPACITOR 0 94uF AC2200V SECONDARY INTERLOCK RELAY GND RY1 OVEN LAMP RELAY COM N O COM N C HIGH VOLTAGE RECTIFIER H N C3 C2 C1 C1 LINE CROSS CAPACITOR 0 22uF AC250V C2 C3 LINE BYPASS CAPACITOR 0 033uF AC250V BLK NOISE FILTER MONITOR FUSE 20A TO LOAD TO LOAD TO SOURCE TO SOURCE OVEN THERMAL CUT OUT 120VAC 60Hz WHT GRN B2 B1 CONTROL UNIT MAGNETRON TEMPERATURE FUSE RY2 DOOR SE...

Page 12: ...NSING SWITCH SECONDARY INTER LOCK RELAY RY2 RE LAY RY1 PRIMARY INTER LOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCE DURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY 4 TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the foods on the turntable cook evenly during cooking The turntable may ...

Page 13: ...e is installed 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 MAGNETRON...

Page 14: ... temperature making sure 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 be 34 8 to 64 6 F 19 3 to 35 9 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...

Page 15: ...ng of the magnetron Check for restricted air flow to the magnetron especially the cool ing fan and air guide An open thermal cut out Oven indicates overheating of the oven exchange the 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 fa...

Page 16: ...install the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions 8 Procedure G MONITOR SWITCH TEST 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 Before performing this test make sure that the primary interlock switch and the secondary inter...

Page 17: ... functions 11 Procedure J TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI ICs etc Therefore unlike conventional microwave ovens proper maintenance cannot be performed with only a voltmeter and ohmmeter In this service manual the touch control panel assembly is divided into two units Control Unit and Key Unit and also the Control U...

Page 18: ...k 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 capacitor 4 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...

Page 19: ...after the outer case is installed 14 Run the oven and check all functions 14 Procedure M DEFROST TEST WARNING The oven should be fully assembled before following procedure 1 Open the door 2 Place one cup of water in the center of the turntable tray in the oven cavity 3 Close the door touch the DEFROST pad once 4 Press 2 then press 5 5 Touch the START pad 6 The oven is in Defrost cooking condition ...

Page 20: ...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 al...

Page 21: ...ble sounds key touch sound and completion sound 6 Synchronizing Signal Circuit The power source synchronizing signal is available in order to com pose 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 if the door is open or closed 8 Back Light Circuit A circuit to drive the back light...

Page 22: ...o control oscillation input of XIN 32 VSS IN Power source voltage 5 0V The power source voltage to the drive LSI is input to VSS terminal 33 P27 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P70 P71 P41 and P45 terminal while one of G8 line keys on key matrix is touched 34 P26 OUT Key strobe signal Signal applied to touch key section A pulse signal is input t...

Page 23: ...G 16 73 VCC IN Power source voltage GND 0V 74 VREF IN A D converter power source voltage GND 0V The power source voltage to drive the A D converter Connected to GND 75 AVSS IN A D converter power source voltage 5 0V The power source voltage to drive the A D converter 76 COM3 OUT Common data signal Connected to LCD signal COM3 77 COM2 OUT Common data signal Connected to LCD signal COM0 78 COM1 OUT ...

Page 24: ...e oven itself is so short that the two can t be separated For those models check and repair 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...

Page 25: ...is 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 o...

Page 26: ...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 27: ...all outer case and check that oven is operating properly 4 HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL 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 voltage wire of the power transformer from the high voltage capacitor 5 Disconnect the...

Page 28: ...t the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the control panel assembly referring to chapter of CON TROL PANEL ASSEMBLY REMOVAL 5 Disconnect the ribbon cable of the membrane switch from the con trol unit 6 Remove the back light PWB from the control panel frame 7 Remove the four 4 screws holding the control unit to ...

Page 29: ...ake sure that no metal pieces enter the gap between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor 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...

Page 30: ...wn In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0 5mm The vertical position of the latch hook should be adjusted so that the door sensing switch and primary interlock switch are activated with the door closed The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door cl...

Page 31: ...l choke cover to door panel by pushing 6 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges as shown Figure C 5 7 Re install the door stopper to the door assembly NOTE After any service to the door 1 Make sure that door sensing switch and primary interlock switch are operating properly Refer to chapter Test Proce dures 2 An approved microwave survey meter should be used to...

Page 32: ... BRN ORG THERMAL CUT OUT OVEN MAGNETRON TEMP FUSE FAN MOTOR RED RED WHT WHT RED RED POWER SUPPLY CORD 120V 60Hz NOTE The neutral WHT wire must be connected to the terminal with N mark on the power supply cord RED WHT WHT H N NOTE The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw The screw must always be kept tight COM N O DOOR SENSING SWITCH GRY G...

Page 33: ...1N4002x4 AN4 AN5 AN6 Q4 DTA143EKA D30 SP1 RY1 RY2 DU12D1 1P M R AC N AC H 0 1uF 50 d a b c V POWER UNIT R110 15K AN7 R13 10K R14 10K R15 10K IC1 AN7 AN6 AN5 AN4 AN3 AN2 AN1 VL1 VL2 AN0 P57 P56 P55 CNTR0 P53 P52 P51 P50 P47 P46 P45 P44 P43 INT0 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG9 SEG8 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17 BL F F COM NL CF1 1 24 25 40 41 64 65 80 G G JUMPER...

Page 34: ...R402JWT 12 3 3 Printed Wiring Board Figure S 3 Figure S 3 Printed Wiring Board ...

Page 35: ... NO 3 PART NO 4 DESCRIPTION Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250V 1 OVEN PARTS 2 DOOR CONTROL PANEL PARTS INDEX DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA626WRKZ PLASTIC BAG SSAKHA032WRE0 Not replaceable items PACKING CASE FPAK A564WRKZ R 402JK T FPAK A565WRKZ R 402JW T BOTTOM PAD ASSEMBLY FPADBA627WRKZ 6 2 TURNTABLE TRAY 6...

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

Page 37: ... 12 RMOTDA264WRZZ AT Turntable motor 1 12 RMOTDA186WRE0 AW Turntable motor Interchangeable 1 13 RTRN A746WRZZ BM Power transformer 1 13 RTRN A745WRZZ Power transformer for production use Interchangeable CABINET PARTS 2 1 GCABUA991WRPZ BH Outer case cabinet R 402JK T 2 1 GCABUB012WRPZ BH Outer case cabinet R 402JW T 2 2 GDAI A390WRWZ BA Base plate 2 3 GLEGPA104WREZ AF Leg OVEN PARTS 4 1 PHOK A130WR...

Page 38: ...R402JWT 4 2 DOOR CONTROL PANEL PARTS Actual wire harness may be different from illustration 6 6 6 5 5 6 5 7 5 3 5 4 3 5 6 7 3 4 3 3 3 2 5 1 5 2 5 5 5 8 3 1 3 1 3 3 1 1 3 1 2 3 5 ...

Page 39: ... button R 402JW T 3 3 MSPRCA157WREZ AF Open button spring 3 4 DPWBFC531WRKZ BK Control unit 3 5 XEPS730P08XS0 AB Screw 3mm x 8mm DOOR PARTS 5 1 FDORFA412WRTZ BF Door panel 5 2 PSHEPA336WRP0 AF Sealer film 5 3 GWAKPB034WRRZ AX Door frame R 402JK T 5 3 GWAKPB036WRRZ AX Door frame R 402JW T 5 4 HPNL A868WREZ AR Door screen R 402JK T 5 4 HPNL A869WREZ AR Door screen R 402JW T 5 5 GCOVHA382WRF0 AM Chok...

Page 40: ... 4 8 AF PCUSUA191WRP0 1 4 9 AC PCUSUA410WRP0 1 4 11 AB PCUSUA455WRP0 1 4 12 AD PDUC A610WRF0 1 4 13 AR PDUC A936WRFZ 1 4 14 AV PHOK A130WRFZ 1 4 1 AK PPACGA084WRF0 1 4 10 AE PPACGA272WREZ 1 4 15 AG PSHEPA336WRP0 2 5 2 AF PSHEPB179WREZ 2 3 1 1 AT PSHEPB180WREZ 2 3 1 1 AT Q QFS TA013WRE0 1 1 3 AG QSW KA063DRZZ 2 3 1 2 AQ QSW MA085WRE0 1 1 4 AF QSW MA147WRZZ 1 1 4 AG R RC QZA211WRE0 1 1 9 AV RLMPTA08...

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