Sharp R-320DK Service Manual Download Page 10

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R- 320DK
R-3 20DQ
R-320DW

Figure O-2. Oven Schematic-Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
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

Summary of Contents for R-320DK

Page 1: ... 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 21 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 27 PIC...

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: ...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 Electr...

Page 7: ... DIAGRAM 1 Door open handle Pull to open door 2 Door latches The oven will not operate unless the door is securely 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 Time displ...

Page 8: ...secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence 1 Whenthedooropensfromtheclosedposition theprimary interlock relay RY2 and secondary interlock switch open their contacts And contacts of the relay RY1 remains closed Then the monitor switch contacts close 2 When the door is closed from the open pos...

Page 9: ...k 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 from the food the display switches over to the remaining cooking time...

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: ...t extremely 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 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 star...

Page 14: ...D 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 ...

Page 15: ...with 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...

Page 16: ...ase 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...

Page 17: ...ith 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 described according to the symptoms indicated Before testing 1 Disconnect the power supply cord and then remove outer case 2 Open the door ...

Page 18: ...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 Disconnect the power supply cord and the...

Page 19: ...t 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 VOLTAGE CONNECTED COMPONENTS RY1 Approx 24 0V D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 24 0V D C Power transformer 8 Disconnec...

Page 20: ...ts 6 Reconnect all leads removed from components during testing 7 Re install the outer case 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...

Page 21: ...oven will shut off Water load cooking test WARNING The oven should be fully assembled before following procedure Make 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 ...

Page 22: ...as follows 9 1 Touch REHEAT SENSOR pad once 9 2 The control panel is in the sensor cooking operation 9 3 After approximately 30 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 count down If the above is not the case the contr...

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: ...s 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 Sign...

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: ...Standard voltage for LCD 59 VSS0 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 S...

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 ABSOLUTE H...

Page 28: ...t terminal 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 ...

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: ...LTAGE 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 of high voltage rectifier assembly from the magnetron 6 Disconnect the filament lead short one of the power transformer...

Page 31: ...r 4 screws 5 Reconnect the wire leads to the magnetron and thermal cut out MG Refer to PICTORIAL DIAGRAM on page 32 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 supply cord and then remove outer case 2 Open the door and block it open 3 Discharge hig...

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: ...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 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 lat...

Page 34: ...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 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: ...6 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 150k...

Page 38: ... F G H A B C D E F G H Figure S 5 Printed Wiring Board of Power Unit DIP F SW R3 SP1 R2 E B R1 C4 C2 C5 RY2 RY1 VRS1 P S T1 RY3 CN D D6 D1 D4 D8 D2 D3 D20 D5 R4 Q2 Q3 B B E E R6 D9 D7 J2 J1 D10 R5 ZD1 1 2 C3 C1 CN C CN A CN B SH B SH A RED GREEN 1 1 1 1 2 3 2 12 ...

Page 39: ...C 2 4 GLEGPA077WRF0 Leg 1 AH CONTROL PANEL PARTS 3 1 DPWBFC024WRKZ Power unit 1 BA 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B FW VZA232DRE0 12pin lead wire CN C 1 AE 3 1C FW VZA195DRE0 Switch harness A SH A 1 AD 3 1D FW VZA256DREZ Switch harness B SH B 1 AF C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AF D20 RSRCDA013DRE0 Diode bridge S1NB10 1 AG RY1 RRLY A076DRE0 Relay OMIF S 124LM 1 AK RY2 RR...

Page 40: ...NL A731WRRZ Door screen R 320DK 1 AS 5 4 HPNL A734WRR0 Door screen R 320DW 1 AS 5 4 HPNL A739WRR0 Door screen R 320DQ 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 VZ...

Page 41: ...4 13 4 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 1 1 14 1 5 6 6 7 9 4 22 4 25 4 23 7 3 ...

Page 42: ... 5 1 2 3 A B C D E F G H A B C D E F G H CONTROL PANEL PARTS 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 6 3 1 3 6 3 2 3 4 3 3 3 3 1 3 5 DOOR PARTS MISCELLANEOUS ...

Page 43: ... SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA416WRKZ PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCD351WREZ R 320DK SPAKCD357WREZ R 320DW SPAKCD358WREZ R 320DQ 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: ...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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