Sharp R-320FK Service Manual Download Page 10

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R - 320 FK
R - 320 FQ
R-320FW

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

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

TURN-
TABLE
MOTOR

FAN
MOTOR

POWER
TRANSFORMER

CAPACITOR 1

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

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 1

AC 2300V

COM.

AH SENSOR

MAGNETRON

Summary of Contents for R-320FK

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: ...ion 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 Micr...

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: ...p water initially at 20 5 C 68 F in the center 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 accuratel...

Page 5: ...oor 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: ...ELP pad SENSOR COOK pads INSTANT ACTION pads DEFROST CENTER pads 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 Nationa...

Page 7: ...AGRAM 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 display D...

Page 8: ...h 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 closed Then the monitor switch conta...

Page 9: ...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 pad 4 When the sensor detect...

Page 10: ...SFORMER CAPACITOR 1µF 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 F3 F1 F2 AH SENSOR OVEN LAMP TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER SECONDARY INTERLOCK SWITCH TTM OL FM N...

Page 11: ...ARY INTERLOCK RELAY RY2 RELAY RY1 SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OP ERATION REFER TO CHAPTER TEST PRO 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 direct...

Page 12: ...t FFS BA023WRK0 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: ...cycle but extremely uneven heating is pro duced in oven load food Oven does not cook properly when programmed for cooking power 50 mode Operates properly on cook ing power 100 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 st...

Page 14: ...t of the magnetron can be measured by performing a water temperature rise test This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring silicon rectifier high voltage capacitor and power transformer This test will require a 16 ounce 453cc measuring cup and an accurate mercury thermometer or thermocouple type temper...

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: ...inet 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 Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch...

Page 17: ...use is blown by improper switch operation the monitor fuse and monitor switch must be replaced with monitor fuse and monitor switch assembly part number FFS BA023WRK0 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 R...

Page 18: ...t 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 Dis...

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: ...bove 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 7 Follow...

Page 21: ...r 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 the TIMER CLOCK once the POWER LEVEL pad twice the START pad once and the number pads 1 once and the number pad 4 once Now the oven is in the sensor c...

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 and the number pad 4 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 sam...

Page 23: ...e when power 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...

Page 24: ... and L level in repetition according to the 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 Signal applied to touch key section A pulse signal is input to ANI7 P100 P101 P102 and P1...

Page 25: ...s an analog 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 ...

Page 26: ...ower 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 SEG 5 ...

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 hea...

Page 28: ...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 Oscilloscop...

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

Page 30: ...EPLACEMENT CAUTION 1 DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE 2 DISCHARGE THE HIGH VOLTAGE CA PACITOR BEFORE TOUCHING ANY OVEN 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 of the ...

Page 31: ... the control panel assembly to the oven flange 7 Slide the control panel assembly upward and remove it 8 Now individual components can be removed NOTE 1 Beforeattachinganewkeyunit wipeoff remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol 2 When attaching the key unit to the control panel frame adjust the upper edge and right edge of the key unit ...

Page 32: ...cause the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor because the coil may be cut or injured Do not disfigure the bracket by touching with the pliers 13 Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand 14 Now the fan blade will be free CAUTION Do not reuse the removed...

Page 33: ...owave survey meter Refer to Microwave Measurement Procedure Figure C 3 Latch Switch Adjustments REMOVAL 1 Disconnect the power supply cord 2 Open the door slightly 3 Insert a putty knife thickness of about 0 5mm into the gap between the choke cover and door frame as shown in Figure C 4 to free engaging parts 4 Pry the choke cover by inserting a putty knife as shown Figure C 4 5 Release choke cover...

Page 34: ...or on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle This function does not require that door be air tight moisture condensation tight or light tight Therefore occasional appearance of moisture light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a lea...

Page 35: ...RED GRN RED GRN GRN WHT GRY BLK BLK WHT 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 C N O N O CN F CN A T1 1 2 CONTROL UNIT CPU UNIT POWER UNIT H N NOTE The grounding conductor of the power supply cord has been grounded by power suppl...

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: ... 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 R...

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: ...geable 1 AP 1 14 FDTCTA197WRK0 AH sensor assembly 1 BC CABINET PARTS 2 1 GCABUA836WRPZ Outer case cabinet R 320FK 1 BD 2 1 GCABUA838WRPZ Outer case cabinet R 320FQ 1 2 1 GCABUA834WRPZ Outer case cabinet R 320FW 1 BD 2 2 GDAI A343WRWZ Bottom plate 1 AX 2 3 GLEGPA074WRE0 Foot 1 AC CONTROL PANEL PARTS 3 1 DPWBFC024WRKZ Power unit 1 BA 3 1A QCNCMA446DRE0 2 pin connector CN A 1 AC 3 1B FW VZA232DRE0 12...

Page 40: ...or frame R 320FQ 1 AZ 5 3 GWAKPA832WRRZ Door frame R 320FW 1 AX 5 4 HPNL A740WRRZ Door screen R 320FK 1 AS 5 4 HPNL A742WRRZ Door screen R 320FQ 1 AS 5 4 HPNL A742WRRZ Door screen R 320FW 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...

Page 41: ...4 25 4 23 7 3 7 6 7 8 7 6 7 8 6 7 2 1 4 13 4 17 4 14 4 2 4 26 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 7 6 7 6 7 6 7 6 1 9 7 1 1 11 4 6 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 4 9 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 4 5 2 2 1 13 7 3 7 6 7 1 1 10 1 5 6 6 7 9 4 22 ...

Page 42: ...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 3 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: ...034WRE0 Not replaceable items PACKING CASE FPAK A418WRKZ R 320FK FPAK A419WRKZ R 320FQ FPAK A417WRKZ R 320FW BOTTOM PAD ASSEMBLY FPADBA469WRKZ 6 2 TURNTABLE TRAY 6 4 INSTRUCTION BOOK PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA451WRE0 INTO THE OVEN CAVITY PLASTIC SHEET for R 320FK SPADPA616WREZ CABINET COVER for R 320FK 320FQ SPAKHA011WRE0 FOAM SHEET SPAKHA012WREZ for R 320FK 320FQ ...

Page 44: ...HT 2002 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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