Sharp R-320HK Service Manual Download Page 34

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R - 320HK
R- 320HQ
R-320HW

Figure S-2. Control Unit Circuit

LSI UNIT

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

POWER

TRANSFOMER

IF NOT SPECIFIED 1/10W

G1 3

G1 2

G1 1

G1 0

F-1

F-2

B-1

COM

B-2

10uF/

35V

2SB1238

ZD 1

HZ 16-

3.3K

1/4W

10u

35V

a b

1/4W

1SS270A x2

8 6

(J1

)

-5

1000uF

35V

1/4W

POWER UNIT

P26

P P27

IC1

NOTE:

D31 1SS270A

D30 1SS270A

DTA123JS

DOOR

SENSING

SWITCH

AC(H)

AC(N)

AH SENSOR

CN-F

LD4 LD3 LD2 LD1

WH-1

RY1

RY2

VRS1

10G471K

D1-- D4

1N4002x4

PA111DR

0.1uF

50V

C10

47uF/16V

680 1/2W

4.7K 1/4W

2SB1238

R90

330 1W

R91

3.32KD

KRC243M

1SS270A

DOOR

COM

R40

4.7K

C40

R41

15K

0.01uF 25V

0.1uF

50V

C20

R68

15K

P70

R69

15K

P71

R70

15K

P41

R71

15K

R72

15K

P45

(G)

R74--R78:270Kx5

C60--C64:330pF/50Vx5

R78

R77

R76

R75

R74

C64

C63

C62

C61

C60

R67

15K

R66

15K

P25

R65

15K

P24

R64

15K

P23

R63

15K

P22

R62

15K

P21

R61

15K

P20

R60

15K

R110

15K

R80

P41

P40

RESET

P71

P70

XIN

XOUT

VSS

P27

P26

P25

P24

P23

P22

P21

P20

VL3

COM0

COM1

COM2

COM3

AVSS

VREF

VCC

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

CF1

CST4.00MGW

(F)

(G)

VL2

VL1

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

P57

P56

P55

CNTR0

P53

P52

P51

P50

P47

P46

P45

P44

P12

P13

P14

P15

P16

P17

P43

INT0

R13

10K

R14

10K

R15

10K

LIQUID CRYSTAL DISPLAY

COOK

SENSOR

LBS

DEF

HELP

COM3

COM0

COM1

COM2

COM3

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

COM0

COM1

COM2

GND

AN7

AN6

AN5

AN4

(J16)

(J17)

(J14)

(J12)

(J10)

3.6K

4.7K

(J15)

4.7K

(J13)

4.7K

(J11)

4.7K

0.01uF

25V

C14

15K

R11

Q10

2SA1037AK

UDZ4.3B

D90

MA152WA

ZD10

R10

Q11

DTA143EKA

0.01uF

25V

C13

C92

0.01uF

25V

C93

0.01uF/25V

R95

47K

R94

10K

R97

47K

R93

360KF

37.4KF

R102

R98 620K

R99 300K

R100 150KF

R101 75KF

P57

P56

P55

P51

P53

IC2

BA4558

2 3 4

C91

0.1uF50V

R92

1.8KF

0.1uF 50V

Q30

DTA143EKA

Q20

DTA143EKA

C90

R96

3.57KD

(F)

0.1uF/50V

C11

C12

0.1uF

50V

R12

15K

BEVERAGE

ROLLS/

MUFFINS

GROUND

MEAT

SENSOR

COOK

STEAKS/

CHOPS

HOT

WATER

BONELESS

POULTRY

BONE-IN

POULTRY

KEEP

WARM

TIMER

CLOCK

STOP

CLEAR

POWER

LEVEL

CUSTOM

HELP

SENSOR

REHAET

START

MINUTE PLUS

POPCORN

Summary of Contents for R-320HK

Page 1: ...BSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING INSIDE FRONT COVER WARNING TO SERVICE PERSONNEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 10 TEST PROCEDURE 11 TOUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PR...

Page 2: ...tion 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 an operative unit perform a microwave emission check as per the Mic...

Page 3: ...age capacitor 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 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 capacitor 4 R...

Page 4: ...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 Mode 5 Cl...

Page 5: ...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 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized...

Page 6: ...EL pad TIMER CLOCK pad STOP CLEAR pad START MINUTE PLUS pad Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J SPECIFICATION GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Ele...

Page 7: ...eals and sealing surfaces 6 Turntable motor shaft 7 Removable turntable support Carefully place the turntable support in the center of the oven floor 8 Removable turntable Place the turntable on the turntable support securely The turntable will rotate clockwise or counterclockwise Only remove for cleaning 9 Ventilation openings Rear 10 Oven light It will light when oven is operating door is open 1...

Page 8: ...or was opened 7 The monitor switch electrically monitors the operation of the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from the closed position the primary interlock relay RY2 and secondary interlock switch open their contacts And contacts of the relay RY1 remains clo...

Page 9: ... lamp and cooling fan motor are turned on but the power transformer is not turned on 3 After about 16 seconds the cook relay RY 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR ...

Page 10: ... DOOR SENSING SWITCH RY1 RY2 CONTROL UNIT PRIMARY INTERLOCK RELAY GRN B2 CAPACITOR 1µF AC 2300V B1 F3 F1 F2 AH SENSOR Figure O 1 Oven Schematic Off Condition SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY NOTE indicates components with potential above 250V 120V AC 60 Hz OVEN LAMP OVEN LAMP RELAY TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNET...

Page 11: ...N BEFORE REPLACING A BLOWN C T FUSE TEST THE DOOR SENSING SWITCH PRI MARY INTERLOCK RELAY RY2 SECOND ARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE C T FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the food on the turntable is cooked e...

Page 12: ...KZ as an assembly IMPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 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...

Page 13: ...mely uneven heating is pro duced in oven load food Oven does not cook properly when programmed for Cooking Power P 50 mode Operates properly on Cooking Power P HI HIGH mode Oven goes into DEFROST CENTER but food is not defrosted well AH sensor does not end during Sen sor cooking condition Oven does not shut off after a cup of water is boiling by sensor cooking Oven stops at 16 sec after starting O...

Page 14: ...ature of the water 2 Place the cup of water in the oven Operate oven at POWER P HI HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer or thermocouple through the water until the ma...

Page 15: ... and case If it is shorted replace the capacitor 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions 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 A continuity ch...

Page 16: ...n the door and block it open 3 Discharge high voltage capacitor 4 Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the door sensing switch 5 Reconnect all leads removed from components during testi...

Page 17: ...he Control Unit is divided into two units LSI Unit and Power 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 remain iso...

Page 18: ...hmmeter should indicate short circuit When the pad is released the ohmmeter should indicate open circuit If incorrect readings are obtained the key unit is faulty and must be replaced About the other pads the above method may be used 5 Reconnect all leads removed from components during testing 6 Re install the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8...

Page 19: ...AGE STEAKS CHOPS LEVEL TIME LEVEL TIME LEVEL TIME 0 5lb 70 15sec 60 25sec 30 37sec 6 If improper operation is indicated the control unit is probably defective and should be checked To protect the electronic circuits this model is provided with a fine foil pattern added to the primary on the PWB this foil pattern acts as a fuse 1 Foil pattern check and repairs 1 Disconnect the power supply cord and...

Page 20: ...roper cooling and air flow in the cavity To permit adequate ventilation be sure to install so as not to block these vents There should be some space for air circulation 5 Be sure the exterior of the cooking container and the interior of the oven are dry Wipe off any moisture with a dry cloth or paper towel 6 The Sensor works with food at normal storage temperature For example chicken pieces would ...

Page 21: ... connect the dummy resistor circuit see fig to the sensor connector of control panel 6 Disconnect the leads to the primary of the power transformer 7 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 8 After that procedure re connect the power supply cord 9 Check the sensor cook operation proceed as follows 9 1 Close the door Touch the TIMER CL...

Page 22: ...vailable in order to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5V LSI IC1 4 Relay Circuit A circuit to drive the magnetron fan motor turntable motor and light the oven lamp 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds key touch sound and completion sound 6 Synchronizing Signal Circuit The power source synchronizing ...

Page 23: ...n key matrix is touched a corresponding signal will be input into P46 20 P46 OUT Terminal not used 21 P45 IN Signal similar to AN3 When either G12 line on key matrix is touched a corresponding signal will be input into P45 22 23 P44 P43 OUT Terminal not used 24 INT0 IN Signal synchronized with commercial power source frequency This is the basic timing for time processing of LSI 25 P41 IN Signal si...

Page 24: ...5 P47 and AN3 terminal while one of G2 line keys on key matrix is touched 40 P20 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P70 P71 P41 P45 P47 and AN3 terminal while one of G1 line keys on key matrix is touched 41 P17 OUT Back light signal Light emitting diodes driving signal 42 46 P16 P12 OUT Terminal not used 47 SEG25 OUT Terminal not used 48 72 SEG24 S...

Page 25: ...e at its AN1 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R98 R102 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and AN0 terminal of the LSI The voltage of AN1 terminal will indicate about 2 5V This initial balancin...

Page 26: ... control panel by using the dummy resistor s 3 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 type or more advanced model 3 Others Hand tools 4 Other Precautions 1 Before turning on the power source of the control unit remove the a...

Page 27: ...uses the latch leads to rise it is then possible to hear a click as the door switches operate 3 Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is damaged 3 ...

Page 28: ...Disconnect the filament lead short one of the power transformer from the high voltage capacitor 7 Remove the one 1 screw holding capacitor holder to bottom plate 8 Remove one 1 screw holding high voltage rectifier assembly to capacitor holder 9 Disconnect rectifier terminal from capacitor High voltage rectifier assembly is now free 10 Remove capacitor holder Capacitor is now free CAUTION WHEN REPL...

Page 29: ...e control unit assembly to the control panel frame 7 Release the ontrol unit assembly from the six 6 tabs of the control panel frame 8 Now the ontrol unit assembly is free Installation 1 Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol 2 Make sure that the LED sheet and liquid crystal display are installed in position 3 Reinstall the control unit as...

Page 30: ...NG FAN MOTOR REMOVAL CAUTION Do not reuse the removed fan blade because the hole for shaft may be larger than normal 10 Now the fan motor is free INSTALLATION 1 Install the fan blade to the fan motor shaft according to the following procedure 2 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 3 Apply the screw lock tight into the hole for shaft of the fan ...

Page 31: ... switches If each switch has not activated with the door closed loosen screw and adjust the latch hook position After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT REMOVAL 1 Disconnect the power supply cord 2 Open the door ...

Page 32: ... 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 approved microwave survey meter Refer to Microwave Measurement Procedure Note The do...

Page 33: ...HT wire must be connected to the terminal with N mark on the power supply cord GRY RED BLK RED PNK W H T WHT GRY RED GRY GRY GRN GRY GRY GRN BLK GRY WHT GRY RED RED BLK PNK GRY C T FUSE FAN MOTOR TEMPERATURE FUSE OVEN BLK WHT 2 1 WHT WHT WHT WHT RED RY1 PRIMARY INTERLOCK RELAY CN B SP1 CN F CN B T1 1 1 2 3 N O COM RY2 N O COM CONTROL UNIT H N NOTE The grounding conductor of the power supply cord h...

Page 34: ... P20 VL3 COM0 COM1 COM2 COM3 AVSS VREF VCC SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 1M CF1 CST4 00MGW 25 30 75 5 10 15 20 60 55 50 45 70 35 40 41 24 1 80 64 65 F G G6 VL2 VL1 AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 P57 P56 P55 CNTR0 P53 P52 P51 P50 P47 P46 P45 P44 P12 P13 P14 P15 P16 P17 P43 INT0 R13 1...

Page 35: ... B C D E F G H Figure S 3 Printed Wiring Board of Power Unit RY1 RY2 E C B E C B E C B VRS1 L1 D7 D3 P S D4 C2 D1 C1 D2 R8 R7 R2 R4 Q3 Q4 SP1 T1 D6 DZ1 WH 2 WH 2 LED Q2 D5 D8 D30 1 2 J1 J6 J2 J5 R5 C4 C5 CN B CN F 1 2 3 C10 DIP CHIP SIDE R90 J3 D31 R3 R6 E B 1 1 2 2 Q1 ...

Page 36: ...RTS 2 1 GCABUA883WRPZ Outer case cabinet R 320HW 1 BF 2 1 GCABUA889WRPZ Outer case cabinet R 320HK 1 BF 2 1 GCABUA894WRPZ Outer case cabinet R 320HQ 1 BF 2 2 FDAI A265WRYZ Bottom plate 1 AW 2 3 GLEGPA074WRE0 Foot 4 AC CONTROL PANEL PARTS 3 1 CPWBFA862WRKZ Control unit assembly 1 BH 3 2 HPNLCB787WRRZ Control panel frame R 320HW 1 AT 3 2 HPNLCB791WRRZ Control panel frame R 320HK 1 AT 3 2 HPNLCB812WR...

Page 37: ...port 1 AR 6 2 NTNT A117WREZ Turntable 1 AS 6 3 FW VZB978WREZ Main wire harness 1 AT 6 4 TCAUAA268WRRZ DHHS caution label 1 AF 6 5 TCAUAA280WRRZ Monitor caution 1 AF 6 6 TINSEA976WRRZ Instruction book 1 AP SCREWS NUTS AND WASHERS 7 1 XHPSD40P08K00 Screw 4mm x 8mm 2 AA 7 2 LX CZA070WRE0 Special screw 2 AC 7 3 LX CZA073WRE0 Special screw 2 AC 7 4 LX CZ0052WRE0 Special screw 2 AA 7 5 LX EZA042WRE0 Spe...

Page 38: ...0 7 1 4 1 4 5 4 4 4 13 6 5 7 3 4 3 7 8 4 9 2 1 1 7 1 12 7 6 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 12 4 12 4 12 4 2 1 1 1 1 1 11 7 7 7 10 7 10 7 7 6 4 7 11 7 12 7 2 7 2 7 10 7 10 7 10 7 6 1 2 7 8 4 8 1 8 7 10 7 8 1 2 2 3 2 2 4 12 4 14 7 9 4 16 1 3 4 15 1 6 7 1 6 1 6 2 4 7 4 6 2 3 2 3 2 3 ...

Page 39: ... 320HW 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H DOOR PARTS CONTROL PANEL PARTS MISCELLANEOUS 3 2 3 1 3 6 3 5 3 4 3 3 Actual wire harness may be different from illustration 6 3 5 1 5 3 5 2 3 4 5 4 5 5 5 7 5 6 ...

Page 40: ... 4S1 700E Printed in U S A 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA506WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE FPAK A479WRKZ R 320HK FPAK A480WRKZ R 320HQ FPAK A478WRKZ R 320HW BOTTOM PAD ASSEMBLY FPADBA508WRKZ CABINET COVER SPAKHA011WRE0 only for R 320HK FOAM SHEET SPAKHA012WREZ only for R 320HK PL...

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Sharp R-320HK, Service Manual

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