Sharp R-320EK Service Manual Download Page 37

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R-320EK
R-320EQ
R-320EW

Figure S-3. CPU Unit Circuit

C-4

C-2

C-9

C-3

C-10

C-1

C-5

C-8

C-12

C-11

F-1

F-2

F-3

G 9

G10

G11

G12

G13

G14

G 8

G 7

G 6

G 5

G 4

G 3

G 2

G 1

–

C-6

C-7

C1 0.1

/50v

LD4

LD3

LD2

LD1

C3 0.1

/50v

C4 10

/35v

C10 47

/16v

C11 0.1

/50v

C40 0.01

/25v

C65 330p/50v

C64 330p/50v

C63 330p/50v

C62 330p/50v

C61 330p/50v

C60 330p/50v

C91

0.015

/25v

C12

0.1

/50v

C13

0.01

/25v

/35v

C20

0.1

/50v

C92

0.01

/25v

C93 0.01

/25v

C90

0.1

/50v

C14

0.01

/25v

(J10)

(J11)

4.7K

(J13)

4.7K

(J15)

4.7K

R13

10K

R14

10K

R15

10K

(J12)

(J14)

ZD1

UDZ16B

D10 MA152WA

ZD10

UDZ4.3B

R1 2.4k

1/4w

R5 4.7k

R96 3.57KD

R91 3.32KD

R12 15k

3.3k

1/4w

R93 360kF

R80

P26

S20

S19

S18

S17

S16

S15

S14

S13

S12

S11

S10

S 9

S 8

S 7

S 6

S 5

S 4

S 3

S 2

S 1

SEG0

SEG35

SEG34

SEG33

SEG32

SEG31

SEG30

SEG29

SEG28

SEG27

SEG26

SEG25

SEG24

SEG23

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

COM0

COM1

COM2

S 0

VSS0

VLC2

VLC1

VLC0

BIAS

COM3

COM2

COM1

COM0

P27

P70

P71

P72

I C

X 2

X 1

VDD1

XT1

XT2

RESET

INTP0

INTP1

P02

P03

P04

P05

P110

P111

P112

P113

P114

P115

P116

P117

AVSS

ANI0

ANI1

ANI2

P37

S21

SEG21

SEG35

S22

S23

S24

S25

S26

S27

S28

S29

S30

S31

S32

S33

S34

S35

P83

P82

P81

P80

P25

P36

P35

P34

P33

P32

P31

P30

P103

P102

VSS1

P101

P100

VDD0

ANI7

ANI6

ANI5

ANI4

ANI3

AVREF

R101 75kF

R40 4.7k

P103
P102
P101
P100
ANI7
ANI6

R67

15k

R66

15k

R65

15k

R64

15k

R63

15k

R62

15k

R61

15k

R60

15k

R79 270k

R78 270k

R77 270k

R76 270k

R75 270k

R74 270k

R102 37.4kF

R100 150kF

R99 300k

R98 620k

R10 1k

R11 15k

R2 680 1/2w

R68 15k

R69 15k

R70 15k

R71 15k

R72 15k

R73 15k

R41 15k

R92 1.8kF

R90

330 1w

R94 10k

R95 47k

R97 47k

100

CF1 CST4.00MGW

CHICKEN

BREAST

MINUTE

PLUS

CHICKEN

PIECES

STEAKS

CHOPS

BAKED

POTATOES

FROZEN

VEGETABLES

FRESH

VEGETABLES

KEEP WARM

PLUS

POWER

LEVEL

REHEAT

SENSOR

CUSTOM

HELP

FROZEN

ENTREES

STOP

CLEAR

FRESH ROLLS

MUFFINS

FROZEN ROLLS MUFFINS

FISH

SEAFOOD

GROUND MEAT

(SENSOR COOK)

GROUND MEAT

(COMPU DEFROST)

POPCORN

RICE

START

BEVERAGE

27 1/4w

1SS355 x 2

KRC243S

(D20)

MA152WK

D30

MA152WA

Q30 DTA143EKA

Q20 DTA143EKA

Q21 DTA123JKA

(Q22 DTA123JKA)

R3 510

1/2w

Q1 KTA1661

Q2 KTA1661

Q11

DTA143EKA

Q10

2SA

1037AK

D90

MA152WA

IC2 BA4558

E D C B A

GND

CPU UNIT

DOOR

SENSING

SWITCH

CN-F AH SENSOR

NOTE

: IF NOT SPECIFIED 1/10W

INT

GND

MICRO

TOP

HEATER

BUZZER

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

IC1

IXA097DR

LIQUID CRYSTAL DISPLAY

KEY UNIT

TIMER

CLOCK

COOK

SENSOR

LBS

DEF

HELP

Summary of Contents for R-320EK

Page 1: ...EFORE 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 12 TOUCH CONTROL PANEL 21 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 2...

Page 2: ...neration 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...

Page 3: ... 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 Reco...

Page 4: ...er of 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 Co...

Page 5: ...he 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 Certaininitialpartsareintentionallynotgroundedandpresent a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized High...

Page 6: ... pad MINUTE PLUS pad POWER LEVEL pad STOP CLEAR pad START 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 E...

Page 7: ...VEN DIAGRAM 1 Door open handle Pull to open door 2 Door latches The oven will not operate unless the door is securely close 3 Removable turntable support 4 Removable turntable The turntable will rotate clockwise or counterclockwise 5 Oven lamp It will light when oven is operating or door is opened 6 Oven door with see through window 7 Ventilation openings Rear 8 Auto Touch control panel 9 Time dis...

Page 8: ...cally 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 closed Then the monitor switch contacts close...

Page 9: ...ower 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 pad 4 When the sensor detects the vapor emitted fro...

Page 10: ...0V AC 60 Hz GRN MONITOR FUSE 20A THERMAL CUT OUT OVEN THERMAL CUT OUT MG COM CAPACITOR 0 94µF AC 2300V A1 A2 COM F3 F1 F2 AH SENSOR MAGNETRON Figure O 1 Oven Schematic Off Condition SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY 120V AC 60 Hz OVEN LAMP TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER CAPACITOR 0 94µF AC 2300V MONITOR SWITCH RECTIFIER MAGNETRON SECONDARY INTE...

Page 11: ...MARY INTERLOCK RELAY RY2 RELAY RY1 SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OP ERATION REFERTOCHAPTER TESTPRO CEDURE NOTE MONITOR 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 foods on the turntable cook evenly during cooking The turntable may turn in either directio...

Page 12: ...t FFS BA021WRK0 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 p...

Page 13: ... extremely uneven heating is pro duced in oven load food Oven does not cook properly when programmed for cooking power 50 P 50 mode Operates properly on cooking power 100 P HI mode Oven goes into COMPU DEFROST 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 sta...

Page 14: ...SHOULD BE OBSERVED Power output of the magnetron can be measured by performing a water temperature rise test This test shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing componentsorwiring siliconrectifier highvoltagecapacitorandpowertransformer Thistestwillrequire a 16 ounce 453cc measuring cup and an accurate mercury thermometer or thermocouple type tempera...

Page 15: ...heck 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 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 a...

Page 16: ...7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 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 Isolatetheswitchandconnecttheohmmetertothecommon COM andnormallyopen NO terminal of the switch The meter shoul...

Page 17: ...ion the monitor fuse and monitor switch must be replaced with monitor fuse and monitor switch assembly part number FFS BA021WRK0 even if the monitor switch operates normally The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after t...

Page 18: ...s not light d The corresponding segments 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 problems 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 When testing is completed 1...

Page 19: ...ith an A C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 and RY2 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY S...

Page 20: ...p after above check and repairs are finished 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 isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord...

Page 21: ...efore checking sensor cook operation The cabinet should be installed and screws tightened 1 Fill approximately 200 milliliters 7 2 oz of tap water in a 1000 milliliter measuring cup 2 Place the container on the center of tray in the oven cavity 3 Close the door 4 TouchtheTIMER CLOCKonce thePOWERLEVELpadtwice theSTARTpadonceandthenumber pads 1 once Now the oven is in the sensor cooking condition an...

Page 22: ...ter that procedure re connect the power supply cord 9 Check the sensor cook operation proceed as follows 9 1 Touch the TIMER CLOCK pad once the POWER LEVEL pad twice the START pad once and the number pads 1 once 9 2 The control panel is in the sensor cooking operation 9 3 After approximately 25 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH ...

Page 23: ...ower is supplied 2 Indicator Circuit This circuit consists of 36 segments and 3 common electrodes using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5V LSI IC1 4 Relay...

Page 24: ...odes variable cooking the signal turns to H level and L level in repetition according to the power level ON and OFF times for other power level 17 P04 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 18 P05 OUT Terminal not used 19 P110 OUT Key strobe signal S...

Page 25: ...alog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI 34 ANI6 IN Input terminal to judge the model The signal out of P117 will be input into ANI6 through G1 line on key matrix The LSI will judge the model by this signal 35 ANI7 IN Signal coming from touch key When either G13 line on key matrix is touched a corresponding signal out of P110 P117 will be...

Page 26: ...S0 IN Power source voltage 5 0V The power source voltage to the LSI is input to VSS0 terminal Connected toVC 60 95 S0 S35 OUT Segment data signal Connected to LCD The relation between signals are as follows LSI signal Pin No LCD Pin No LSI signal Pin No LCD Pin No S0 60 SEG 0 S18 78 SEG 18 S1 61 SEG 1 S19 79 SEG 19 S2 62 SEG 2 S20 80 SEG 20 S3 63 SEG 3 S21 81 SEG 21 S4 64 SEG 4 S22 82 SEG 22 S5 65...

Page 27: ... 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 ANI4 terminal of the LSI The voltage of ANI5 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode As the sensor cooking proceeds the food is he...

Page 28: ...erminal of the touch control panel then it is possible 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 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 Osc...

Page 29: ...e capacitor and High voltage rectifier assembly 2 Hot parts Oven lamp Magnetron High voltage transformer WARNING FOR WIRING 1 Disconnect the power supply cord 2 Visuallycheckthedoorandcavityfaceplatefordamage 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...

Page 30: ...CONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE 2 DISCHARGE THE HIGH VOLTAGE CA PACITORBEFORETOUCHINGANYOVEN COMPONENTS OR WIRING HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR 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 high voltage wire B from the power transformer 5 Disc...

Page 31: ...s to the magnetron and thermal cut out MG Refer to PICTORIAL DIAGRAM on page 28 5 Re installoutercaseandcheckthattheovenisoperating properly CAUTION WHEN REPLACING MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND MOUNT ING SCREWS ARE TIGHTENED SECURELY 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 wir...

Page 32: ...owing procedure 3 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 4 Apply the screw lock tight into the hole for shaft of the fan blade 5 Install the fan blade to the shaft of fan motor by pushing thefanbladewithasmall lightweight ballpeenhammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be disfigured...

Page 33: ...nitor switch contacts close when door is opened 4 Re install outer case and check for microwave leakage around door with an approved microwave survey meter Refer to Microwave Measurement Procedure Figure C 3 Latch Switch Adjustments 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect wire leads from the switches...

Page 34: ...ith proper microwave radiation emission limitation standards After any service make sure of the following 1 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 fo...

Page 35: ...NOTE The neutral WHT wire must be connected to the neutral WHT wire of the power supply cord GRY RED RED RED WHT YLW WHT BLK BLK BLK YLW YLW RED GRN RED GRN GRN WHT GRY BLK BLK WHT BLUE MARK BLK BLK BLK THERMAL CUT OUT MG FAN MOTOR THERMAL CUT OUT OVEN MONITOR FUSE HOLDER BLK BLK BLK BLK GRY WHT WHT 2 1 WHT WHT WHT GRY YLW RED GRN RY2 RY1 SP1 IC1 SH A SH B PRIMARY INTERLOCK RELAY CN A CN G CN C CN...

Page 36: ...Y2 DOOR SENSING SWITCH 12PIN LEAD WIRE HARNESS CN B NC GND NC NC VR INT VA MICRO MICRO NC CN C CN A CN D AC DOOR SENSING SWITCH BUZZER OVEN LAMP FAN MOTOR TURNTABLE MOTOR OVEN LAMP FAN MOTOR TURNTABLE MOTOR D20 S1NB10 GND VRS1 C2 1000µ 35v SP1 J1 10G471K C 2 C 3 C 9 C 4 C 1 C 5 C 6 C 8 C 7 C11 A 2 D 1 D 3 NO COM COM B 2 SH A SH B B 1 C12 b AC NO ...

Page 37: ...NI1 ANI2 P37 S21 SEG21 SEG35 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 P83 P82 P81 P80 P25 P36 P35 P34 P33 P32 P31 P30 P103 P102 VSS1 P101 P100 VDD0 ANI7 ANI6 ANI5 ANI4 ANI3 AVREF R101 75kF R40 4 7k P103 P102 P101 P100 ANI7 ANI6 R67 15k R66 15k R65 15k R64 15k R63 15k R62 15k R61 15k R60 15k R79 270k R78 270k R77 270k R76 270k R75 270k R74 270k R102 37 4kF R100 150kF R99 300k R98 620...

Page 38: ... Power Unit 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 1 DIP F SW R3 SP1 R2 E B R1 C4 C2 C5 RY2 RY1 VRS1 P S T1 RY3 D6 D1 D4 D8 D2 D3 D20 D5 R4 Q2 Q3 B B E E R6 D9 D7 J2 J1 D10 R5 R9 ZD1 1 2 C3 C1 CN C CN A CN B CN D SH B SH A RED GREEN 1 1 1 2 2 12 ...

Page 39: ...1 AP 1 14 RTRN A635WRZZ Power transformer 1 1 15 FDTCTA197WRK0 AH sensor assembly 1 CABINET PARTS 2 1 GCABUA744WRPZ Outer case cabinet R 320EK 1 BC 2 1 GCABUA758WRP0 Outer case cabinet R 320EQ 1 2 1 GCABUA690WRP0 Outer case cabinet R 320EW 1 AZ 2 2 GDAI A316WRW0 Bottom plate 1 AX 2 3 GLEGPA074WRE0 Foot 2 AC 2 4 GLEGPA077WRF0 Leg 1 AH CONTROL PANEL PARTS 3 1 DPWBFC024WRKZ Power unit 1 BA 3 1A QCNCM...

Page 40: ...or frame R 320EQ 1 5 3 GWAKPA790WRRZ Door frame R 320EW 1 5 4 HPNL A740WRRZ Door screen R 320EK 1 AS 5 4 HPNL A742WRRZ Door screen R 320EQ 1 AS 5 4 HPNL A742WRRZ Door screen R 320EW 1 AS 5 5 LSTPPA193WRFZ Latch head 1 AE 5 6 MSPRTA187WRE0 Latch spring 1 AC 5 7 XEPSD40P08000 Screw 4mm x 8mm 6 AA 5 8 PCUSUA461WRP0 Cushion 1 AB 5 9 PCUSUA553WRPZ Cushion 2 AC 5 10 PCUSUA554WRPZ Cushion 2 AB 5 11 GCOVH...

Page 41: ... 23 7 3 7 5 7 8 7 5 7 8 1 10 6 7 2 1 4 13 4 17 1 11 4 14 4 2 1 12 7 1 7 5 1 7 4 21 1 8 7 6 7 6 4 11 1 6 1 1 7 1 2 3 2 3 7 6 7 6 7 6 7 6 1 9 4 6 7 6 4 15 4 9 4 16 4 18 7 3 7 2 4 8 7 4 4 4 4 15 4 22 7 6 7 6 1 4 4 7 7 7 4 20 7 10 7 6 4 10 4 21 4 19 4 12 6 2 6 1 4 1 7 6 1 3 1 2 1 1 4 3 2 4 4 5 2 2 1 13 7 3 7 6 7 1 1 14 1 5 6 6 7 9 4 22 ...

Page 42: ... C D E F G H A B C D E F G H CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration 6 4 6 3 CAPACITOR 6 5 5 11 5 1 5 3 5 4 5 7 5 7 5 7 5 6 5 7 5 7 5 2 5 5 5 10 5 10 5 9 5 9 5 8 3 6 3 1 3 6 3 2 3 4 3 3 3 3 1 3 5 ...

Page 43: ...Z PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCD554WREZ R 320EK SPAKCD555WREZ R 320EQ SPAKCD556WREZ R 320EW BOTTOM PAD ASSEMBLY FPADBA417WRKZ 6 2 TURNTABLE TRAY 6 8 INSTRUCTION BOOK PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA451WRE0 INTO THE OVEN CAVITY CABINET COVER SPAKHA011WRE0 for R 310EK 320EQ FOAM SHEET SPAKHA012WREZ for R 320EK 320EQ ...

Page 44: ...HT 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be repro duced stored in retrieval systems or trans mitted in any form or by any means elec tronic mechanical photocopying record ing or otherwise without prior written per mission of the publisher ...

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