Sharp R-340DK Service Manual Download Page 10

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R- 340DK
R-340DW

Figure O-2. Oven Schematic-Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN.
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. VARIABLE COOKING POWER (100%) PROGRAMMED.
4. "START" PAD TOUCHED.

OVEN
LAMP

TURN-
TABLE
MOTOR

FAN
MOTOR

POWER
TRANSFORMER

MONITOR
SWITCH

RECTIFIER

SECONDARY
INTERLOCK
SWITCH

TTM

N.O.

DOOR
SENSING
SWITCH

SH-B

SH-A

(RY-1)

(RY-2)

CONTROL UNIT

PRIMARY
INTERLOCK
RELAY

120V AC
60 Hz

GRN

MONITOR
FUSE 20A

THERMAL
CUT-OUT (OVEN)

THERMAL
CUT-OUT (MG.)

COM.

CAPACITOR 0.94

AC 2300V

COM.

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 0.94

AC 2300V

MONITOR
SWITCH

RECTIFIER

MAGNETRON

SECONDARY
INTERLOCK
SWITCH

TTM

MONITOR
FUSE 20A

N.O.

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

AH SENSOR

NOTE: Indicates components with potential above 250 V.

Summary of Contents for R-340DK

Page 1: ... MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 10 TEST PROCEDURE 11 TOUCH CONTROL PANEL 21 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 27 PICTORIAL DIAGRAM 33 POWER UNIT CIRCUIT 34 CPU UNIT CIRCUIT 35 PRINTED WIRING BOARD 36 PARTS LIST 37 PACKING AND ACCESSORIES 41 S2008R340DPW R 340DK R 340DW MICROWAVEOVEN MODELS...

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: ...acitor 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 Reconnec...

Page 4: ...f 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 Cookin...

Page 5: ...ing 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 HighVoltageCapac...

Page 6: ...From Your Microwave pad Beverage Center pad Defrost pad Set Up 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 Natio...

Page 7: ...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 Touch screen 10 Coupling 11 Wave guide cover 12 Power supply cord TOUCH CONTROL PANEL 4 3 1 12 7 2 8 9 6 10 5 11 NOTE The directed features are disabled after three minutes whentheovenisnotinuse Thesefeaturesareautomati ...

Page 8: ...oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle the monitorswitch doorsensingswitch secondaryinterlock switch relay RY1 and primary interlock relay are activated with the following results The circuits to the turntable motor the cooling fan motor and the high voltage components ar...

Page 9: ...in the unit Wait two minutes before cooking on SENSOR 2 Thecoilofshut offrelay RY 1 isenergized theturntable motor oven 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 ...

Page 10: ...E 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 INTERLOCK SWITCH TTM OL FM MONI...

Page 11: ... 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 direction CO...

Page 12: ...S 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 prima...

Page 13: ...but extremely uneven heating is pro duced in oven load food Oven does not cook properly when programmedforCookingPower50 mode Operates properly on Cook ing Power 100 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 starting OFF ...

Page 14: ... 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 temperature t...

Page 15: ... an ohmmeter to see if it is shorted between either of the terminals 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 8 Run the oven and check all functions HIGH VOLTAGES ARE PRESENT AT THE HIGH VOL...

Page 16: ...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 Isolatetheswitchandconnecttheohmmetertothecommon COM andnormallyopen NO terminal of the switch The met...

Page 17: ...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 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...

Page 18: ... 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 h The following symptoms indicate a defective CPU unit When touching the keys on the touch screen a certain key produces no signal at all When touching a number key on the touch screen two figures or more are displayed When touching the keys on the touch screen somet...

Page 19: ...e 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 VOLTA...

Page 20: ... cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and check all functions 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 pr...

Page 21: ...ake sure the oven has been plugged in at least two minutes before 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 Touch Reheat pad Now the oven is in the sensor cooking condition and REHEAT ...

Page 22: ...nel is in the sensor cooking operation 9 3 After approximately 50 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH sensor 9 4 After approximately 3 seconds the display shows X X X X which is the remaining cooking time and the display counts down If the above is not the case the control unit is probably defective If the above is indicated the A...

Page 23: ... IC1 to the initial state when power is supplied 7 Indicator Circuit This circuit consists of 100 x 160 dots using a Liquid Crystal Display The Liquid Crystal Display LCD is drived by IC5 8 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 clo...

Page 24: ...ck signal is output to a memory IC IC4 16 RxD0 OUT Terminal not used 17 P93 OUT Key strobe signal Signal applied to key unit section A pulse signal is input to PB1 PB5 terminal while one of G1 line keys on key matrix is touched 18 P94 OUT Key strobe signal Signal applied to key unit section A pulse signal is input to PB1 PB5 terminal while one of G2 line keys on key matrix is touched 19 P95 OUT Ke...

Page 25: ...wer source voltage GND 0V The power source voltage to drive LSI is input to Vss terminal 60 WATT IN Connected to VCC 61 P61 OUT Envelope signal to sound buzzer A key touch sound short beep B Completion sound melody or long beep 62 P62 OUT Reset signal is output to IC5 63 P67 OUT Terminal not used 64 STBY IN Connected to VCC 65 RES IN Auto clear terminal Signal is input to reset the LSI to the init...

Page 26: ...To input signal which communicates the door open close information to LSI Door close H level signal 5V Door open L level signal GND 85 AN5 IN Used for initial balancing of the bridge circuit absolute humidity sensor This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI 86 AN6 IN AH sensor input This input is an analog input terminal...

Page 27: ...hange the resistance values in parallel with R47 R52 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and AN5 terminal of the LSI The voltage of AN6 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the SensorCookingmode Asthesensorcookingproceeds the food is he...

Page 28: ...ply cord between the touch control panel and the 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 long enough that they may be separated from each other ...

Page 29: ...pacitor 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 fir...

Page 30: ...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 Disconnect the high voltage wire...

Page 31: ... flange with the four 4 screws 3 Insert the two 2 tabs of the chassis support to the oven cavity front plate and the back plate 4 Hold the chassis support to the oven 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 33 6 Re installoutercaseandcheckthatthe...

Page 32: ...g 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 Mak...

Page 33: ...tor 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 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 5 Remove two 2 screws holding latch h...

Page 34: ...oper 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 micr...

Page 35: ... 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 GRN RED 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 IC1 SH B SH A PRIMARY INTERLOCK RELAY CN A LOWER LOWER UPPER UPPER CN G CN C CN...

Page 36: ...UZZR MICRO N C N C AC MICRO GREEN OVEN LAMP FAN MOTOR TURNTABLE MOTOR OVEN LAMP FAN MOTOR TURNTABLE MOTOR DOOR SENSING SWITCH NOTE IF NOT SPECIFIED 0 1µF 50V DOOR SENSING SWITCH AC120V 60Hz CN A CN C 11P LEAD WIRE HARNESS SP30 RY1 GND RY2 a b c d D1 D1 S1NB10 R2 91 1w Q1 2SD1859 R3 91 1w ZD1 HZ 16 1 R1 VRS1 J1 10G471K 2 4k 1 4w C2 1000µ 35v C1 C 4 C11 C10 C 9 C 7 C 8 C 2 C 1 ...

Page 37: ...10 C9 C7 C8 C2 C1 C5 VR VA GND INT AH SENSOR BUZZER ENV BUZZER OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICROR NC NC DOOR SENSING SWITCH CN C G 5 G 1 Set UP Pasta Grains Defrost 3 6 Frozen Food MINUTE PLUS START TOUCH SCREEN CPU UNIT KEY UNIT Popcorn Meat STOP CLEAR More from Your microwave Fish Seafood Reheat Beverage Center Vegetables Baked Potatoes Poultry G 2 G 3 G14 G 7 G 8 G 9 G10 G14 G6 G13 G12 ...

Page 38: ...D E F G H A B C D E F G H Figure S 5 Printed Wiring Board of Power Unit R3 CN C Q1 SH A GREEN E B R2 D20 RY3 XA VH QKITPB031MREO J1 VRS1 CN A R1 ZD1 C2 C1 VH CN B SH B SP30 D22 RY1 RY2 D21 T1 P S 7 1 3 5 D U D U D U O M O M O M DIP D1 11 1 1 1 2 2 1 2 ...

Page 39: ...AC 2 4 GLEGPA077WRF0 Leg 1 AH CONTROL PANEL PARTS 3 1 DPWBFC042WRKZ Power unit 1 BC 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B FW VZA260DREZ 11pin lead wire CN C 1 AH 3 1C FW VZA195DRE0 Switch harness A SH A 1 AD 3 1D FW VZA256DREZ Switch harness B SH B 1 AF C1 RC KZA087DRE0 Capacitor 0 1 uF 50V 1 AA C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AF D1 RSRCDA013DRE0 Diode bridge S1NB10 1 AG Q1 VS...

Page 40: ...28WRRZ Door frame R 340DW 1 AX 5 4 HPNL A740WRRZ Door screen R 340DK 1 AS 5 4 HPNL A742WRRZ Door screen R 340DW 1 AS 5 5 LSTPPA193WRFZ Latch head 1 AE 5 6 MSPRTA187WRE0 Latch spring 1 AC 5 7 XCPSD40P08000 Screw 4mm x 8mm 4 AA 5 8 PCUSUA461WRP0 Cushion 1 AB 5 9 GCOVHA417WRFZ Choke cover 1 AG MISCELLANEOUS 6 1 FROLPA079WRK0 Turntable support 1 AQ 6 2 NTNT A079WRE0 Turntable tray 1 AR 6 3 FW VZB771WR...

Page 41: ... 17 1 11 1 15 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 24 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 7 6 7 2 4 23 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 3 7 1 1 14 1 5 6 6 7 9 4 22 4 25 4 23 7 3 ...

Page 42: ... 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 5 9 5 1 5 3 5 4 5 7 5 7 5 7 5 6 5 7 5 2 5 5 5 8 3 3 1 3 3 3 2 3 1 3 4 3 4 3 4 ...

Page 43: ...N SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA416WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCD371WREZ R 340DK SPAKCD372WREZ R 340DW 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 44: ...000 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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