Sharp R-308DW Service Manual Download Page 33

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R-308DW
R -310DK
R -310DW

Figure S-4. CPU Unit Circuit For R-310DK/DW

–

C-3

G 9

G 8

5 4

0 9

G 7

G 6

G 5

G 4

G 3

G 2

G 1

G10

G11

G12

G13

G14

C-5

C-9

C-4

C-2

C-6

C-7

C-8

C-1

GND

C1 0.1

/50v

C2 220

/10v

ZD1

UDZ4.3B

C10

0.1

/50v

C40

0.01

/25v

/35v

C21

C3 0.01

/25v

C20 0.1

/50v

C60-65 330pF/50v

FROZEN

ENTREES

MICROWAVE

PIZZA

ROLLS &

MUFFINS

DINNER

PLATE

GROUND

MEAT

COMPU

DEFROST

BAKED

POTATOES

MINUTE

PLUS

FRESH

VEG.

FROZEN

VEG.

CASSEROLE

POPCORN

POWER

LEVEL

START

STOP

CLEAR

BEVERAGE

R68 15k

R69 15k

R70 15k

R71 15k

R72 15k

R73 15k

CF1 CST4.00MGW

0.01

/25v

C11 0.01

/25v

R30 3.3k

R40

R79 270k

R78 270k

R77 270k

R76 270k

R75 270k

R74 270k

R67

15k

R66

15k

R65

15k

R64

15k

R63

15k

R62

15k

R61

15k

R60

15k

C65

C64

C63

C62

C61

C60

R80

4.7k

R2 4.7k

R1 82

R5 1k

R6 15k

R9 4.7k

R8 4.7k

R7 4.7k

R10 15k

R12 4.7k

R41 15k

R90 15k

(J16)

(J17) 4.7k

(J15) 4.7k

(J13) 4.7k

(J11) 4.7k

(J14)

(J12)

(J10)

2SA1037AK

GND

IC1

IXA019DR

Q30

DTA143EKA

Q20

DTA143EKA

Q22

DTA123JKA

D40

MA152WA

Q21

DTD143EKA

Q10

DTA143EKA

2SA1037AK

LD1

LD2

LD3

LD4

R4 560 1/2w

INT

BUZZER

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

MICRO

NOTE

: IF NOT SPECIFIED 1/10W

DOOR

SENSING

SWITCH

SEG8

VL2

VL1

AN7

AN6

AN5

AN4

AN2

AN1

AN0

P57

P56

P55

CNTR0

P53

P52

P51

P50

P47

P46

P45

P44

P43

INT0

P63

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

VL3

COM0

P41

P40

RESET

P71

P70

XIN

XOUT

VSS

P27

P26

P25

P24

P23

P22

P21

P20

COM1

COM2

SEG 1

SEG 2

SEG 3

SEG 4

SEG 5

SEG 6

SEG 7

SEG 8

SEG 9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

COM3

COM2

COM1

COM3

AVSS

VREF

VCC

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG21

P06

P07

P10

P11

P12

P13

P14

P15

P16

P17

TIMER

CLOCK

COOK

OZ.

CUPS

LBS.

NO.

DEFROST

LIQUID CRYSTAL DISPLAY

CPU UNIT

KEY UNIT

AUTO

D20

MA152WA

Summary of Contents for R-308DW

Page 1: ...EFORE 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 9 TEST PROCEDURE 10 TOUCH CONTROL PANEL 18 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 22 PICTORIAL DIAGRAM 28 POWER UNIT CIRCUIT 29 CPU UNIT CIRCUIT 30 PRINTED WIRING BOARD 32 PARTS LIST 33 PA...

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: ...tage 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 ...

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: ...VEL pad TIMER CLOCK 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 Electrical Cod...

Page 7: ...curely closed 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 Timedisplay Digitaldisplay 99minutes99seconds 10 Coupling R 310DK DW R 308D 4 3 1 12 7 2 8 9 6 10 5 11 INSTANT ACTION ...

Page 8: ...owing results The circuits to the turntable motor the cooling fan motor and the 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 secondary interlock switch and primary interlock relay and is mechanically associated wi...

Page 9: ...OR 0 94µF AC 2300V MONITOR SWITCH RECTIFIER MAGNETRON SECONDARY INTERLOCK SWITCH TTM OL FM MONITOR FUSE 20A A1 A2 N O COM COM N O DOOR SENSING SWITCH RY 1 RY 2 CONTROL UNIT PRIMARY INTERLOCK RELAY THERMAL CUT OUT OVEN THERMAL CUT OUT MG SH B SH A GRN OVEN LAMP TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER SECONDARY INTERLOCK SWITCH TTM OL FM N O N O DOOR SENSING SWITCH SH B...

Page 10: ...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 11: ...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 12: ... operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is pro duced in oven load food Oven does not cook properly when programmed for Cooking Power P 5 mode Operates properly on Cook ing Power P HI HIGH mode Oven goes into COMPU DEFROST but food is not defrosted well OFF C...

Page 13: ...SO EXTREME CAUTION 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 thermo...

Page 14: ...ven 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 all functions MAGNETRON THERMAL CUT OUT TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high v...

Page 15: ...lock switch 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 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 Is...

Page 16: ...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 Unit is divided into two units CPU Unit and Power Unit and troubleshooting by unit replacement is describe...

Page 17: ...e When 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 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 TEST PROCEDURES PROCEDURE LETTER COMP...

Page 18: ...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 SYMBOL OPERATIONAL VOL...

Page 19: ...ions 2 Follow the troubleshooting guide given below if indicator does not light up 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...

Page 20: ... to the LSI through P41 P43 P44 P45 and AN0 to perform the function that was requested Control Unit Control unit consists of LSI ACL circuit indicator circuit power source circuit relay circuit buzzer circuit synchronizing signal circuit and back light circuit 1 ACL This circuit generates a signal which resets the LSI to the initial state when power is supplied 2 Indicator Circuit This circuit con...

Page 21: ...ed a corresponding signal will be input into P44 23 P43 IN Signal similar to P45 When either G10 line on key matrix is touched a corresponding signal will be input into P43 24 INT0 IN Signal synchronized with commercial power source frequency This is the basic timing for time processing of LSI 25 P41 IN Signal similar to P45 When either G9 line on key matrix is touched a corresponding signal will ...

Page 22: ...robe signal Signal applied to touch key section A pulse signal is input to P41 P43 P44 and P45 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 AN0 P41 P43 P44 and P45 terminal while one of G1 line keys on key matrix is touched 41 48 P17 P10 OUT Terminal not used 49 50 P07 P06 OUT Terminal not us...

Page 23: ...rols 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 Oscilloscope Singlebeam frequencyrange DC 10MHz type or more advanced model 3 Others Hand tools 4 Other Precautions 1 Before turning on the power source of the control un...

Page 24: ...tage transformer High voltage 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...

Page 25: ...CT 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 Disconnec...

Page 26: ...en cavity back plate oven cavity front flang magnetron and the fan duct with the four 4 screws 5 Reconnect the wire leads to the magnetron and thermal cut out MG Refer to PICTORIAL DIAGRAM on page 28 6 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 supp...

Page 27: ...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 28: ...Monitor 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 switch...

Page 29: ...h 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 for ...

Page 30: ...TRANSFORMER COM NO 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 RELA...

Page 31: ... 3 C 5 C 4 C 6 C 8 C 1 C 7 C 2 A 2 NO SH A COM COM GND D1 S1NB10 T1 AC AC GND INT VR BUZZER MICRO NC DOOR SENSING SWITCH OVEN LAMP TURNTABLE MOTOR FAN MOTOR CN C 9PIN LEAD WIRE HARNESS OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICRO DOOR SENSING SWITCH CN A RY1 RY2 a b c d 1 3 4 7 J1 VRS1 SP1 C1 1000µ 25v 10G471K SH B NO C 9 ...

Page 32: ...15k R9 4 7k R8 4 7k R7 4 7k R10 15k R12 4 7k R41 15k R90 15k J16 J17 4 7k J15 4 7k J13 4 7k J11 4 7k 1 25 64 41 1 24 25 40 65 80 J14 J12 J10 Q1 2SA1037AK IC1 IXA019DR Q30 DTA143EKA Q20 DTA143EKA Q22 DTA123JKA D40 MA152WA D20 MA152WA Q21 DTD143EKA Q10 DTA143EKA Q2 2SA1037AK GND LD1 LD2 LD3 LD4 R4 560 1 2w VR INT BUZZER OVEN LAMP TURNTABLE MOTOR FAN MOTOR NC MICRO NOTE IF NOT SPECIFIED 1 10W 5 DOOR ...

Page 33: ...5 1k R6 15k R9 4 7k R8 4 7k R7 4 7k R10 15k R12 4 7k R41 15k R90 15k J16 J17 4 7k J15 4 7k J13 4 7k J11 4 7k 1 25 64 41 1 24 25 40 65 80 J14 J12 J10 Q1 2SA1037AK GND IC1 IXA019DR Q30 DTA143EKA Q20 DTA143EKA Q22 DTA123JKA D40 MA152WA Q21 DTD143EKA Q10 DTA143EKA Q2 2SA1037AK LD1 LD2 LD3 LD4 R4 560 1 2w VR INT BUZZER OVEN LAMP TURNTABLE MOTOR FAN MOTOR NC MICRO NOTE IF NOT SPECIFIED 1 10W 5 DOOR SENS...

Page 34: ...R 310DW 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 Figure S 5 Printed Wiring Board of Power Unit 1 1 2 1 1 3 7 4 2 9 CN C D1 D2 D3 SP1 OM DU RY2 XA VH CN A SH B SH A CN B D I P VH RY1 VRS1 T1 P S J1 C1 OM DU ...

Page 35: ...PA074WRE0 Foot 2 AC 2 4 GLEGPA077WRF0 Leg 1 AH CONTROL PANEL PARTS 3 1 DPWBFC021WRKZ Power unit 1 BA 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B FW VZA250DRE0 9pin wire harness CN C 1 AW 3 1C FW VZA195DRE0 Switch harness A SH A 1 AD 3 1D FW VZA256DREZ Switch harness B SH B 1 AF C1 VCEAB31EW108M Capacitor 1000 uF 25V 1 AE D1 RSRCDA013DRE0 Diode bridge S1NB10 1 AG RY1 RRLY A094DRE0 Relay OMIF ...

Page 36: ...RRZ Door screen R 308DW 1 5 5 LSTPPA193WRFZ Latch head 1 5 6 MSPRTA187WRE0 Latch spring 1 AC 5 7 XCPSD40P08000 Screw 4mm x 8mm 4 AA 5 8 PCUSUA461WRP0 Cushion 1 5 9 GCOVHA417WRFZ Choke cover 1 MISCELLANEOUS 6 1 FROLPA079WRK0 Turntable support 1 AQ 6 2 NTNT A079WRE0 Turntable tray R 310DK 1 AR 6 2 NTNT A079WRE0 Turntable tray R 310DW 1 AR 6 2 NTNT A084WRE0 Turntable tray R 308DW 1 AQ 6 3 FW VZB771WR...

Page 37: ...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 3 7 3 1 13 7 6 4 11 4 19 7 2 4 9 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 16 4 18 7 3 4 8 7 4 4 4 4 15 4 22 7 6 7 6 1 4 4 7 7 7 4 20 7 1 7 6 4 10 6 9 4 20 4 12 6 2 6 1 4 1 7 6 1 3 1 2 1 1 4 3 2 4 4 5 2 2 7 3 7 1 1 14 1 5 6 6 7 9 4 22 ...

Page 38: ... 5 1 2 3 A B 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 3 3 1 5 9 5 1 5 3 5 4 3 4 3 2 3 1 3 6 3 3 5 7 5 7 5 7 5 6 5 7 5 2 3 5 3 6 5 5 5 8 ...

Page 39: ... SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA416WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCD335WREZ R 310DK SPAKCD342WREZ R 310DW SPAKCD384WREZ R 308DW 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 ...

Page 40: ...T 2000 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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