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23

R-320BB
R-320BK
R-320BW

Pin No.

Signal

I/O

Description

52

SEG20

OUT

Terminal not used.

53-59

SEG19-SEG13

OUT

Segment data signal.
Signal similar to SEG27.

60

SEG12

OUT

Terminal not used.

61-67

SEG11-SEG5

OUT

Segment data signal.
Signal similar to SEG27.

68

SEG4

OUT

Terminal not used.

69-72

SEG3-SEG0

OUT

Segment data signal.
Signal similar to SEG27.

73/74

VCC/VREF

IN

Connected to GND.

75

AVSS

IN

Connected to VC.

76

COM3

OUT

Common data signal: COM3.
Connected to LCD signal C3 (Pin No. 29)

77

COM2

OUT

Common data signal: COM3.
Connected to LCD signal C2 (Pin No. 28)

78

COM1

OUT

Common data signal: COM3.
Connected to LCD signal C1 (Pin No. 27)

79

COM0

OUT

Common data signal: COM3.
Connected to LCD signal C0 (Pin No. 26)

80

VL3

IN

Power source voltage input terminal.
Standard voltage for LCD.

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Summary of Contents for R-320BB

Page 1: ...FORE 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 9 TEST PROCEDURE 10 TOUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 26 ...

Page 2: ...ation 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 releasing oven to the owner BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per...

Page 3: ...ltage 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: ...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 Theplacingofthisstandardloadintheovenisimportantnotonlytoprotecttheoven butalsotoinsurethatanyleakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode ...

Page 5: ...door packing is not damaged D The door is not deformed or warped E There is not any 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 Hi...

Page 6: ...ANT ACTION pads COMPU DEFROST pads Number selection pads KITCHEN TIMER pad AUTO START CLOCK 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 ...

Page 7: ...ed on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE MOVE THE ROUND GROUNDING PRONG FROM THIS PLUG 3 Pronged Plug Grounded Receptacle Box Grounding Pin 3 Pronged Receptacle OVEN DIAGRAM 1 One touch door open button Push to open door 2 Door latches The oven will not operate unless the door is securely closed 3 Removable turntable support 4 Removable turnta...

Page 8: ...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 with the door so that it will function in the following sequence 1 When the door opens from the closed positio...

Page 9: ...oilofshut 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 remove any vapor from the oven cavity and sensor NOTE During...

Page 10: ...d to render the oven inoperative by means of blowing the monitor fuse when the contacts of the primary interlock relay RY2 and secondary interlock switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contact close to the ON condition due to their being normally closed At this time the primary interlock relay RY2 and secondary interlock switch are in th...

Page 11: ...TPRO 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 COOLING FAN MOTOR The cooling fan motor drives a blade which draws external cool air This cool air is directed through ...

Page 12: ... 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 5 mode Operates properly on Cook ing Power 10 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 boili...

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: ...oling 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 voltage capacitor 4 A continu...

Page 15: ...terlock 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...

Page 16: ...ctors 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 described according to the ...

Page 17: ...f 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 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 te...

Page 18: ... Remove the outer case and check voltage between Pin No 1 of the 2 pin connector A and the common terminal of the relay RY1 on the control unit with 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 indic...

Page 19: ...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 by using insu...

Page 20: ...lliliters 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 once Now the oven is in the sensor cooking condition and REHEAT will appear in the display 5 The oven will operate for the first 16 seconds without generating microwave energy NOTE ERROR will appear if the door is opend or STOP CLEAR pa...

Page 21: ...econds 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 control unit is probably defective If the above is proper the AH sensor is probably defective 10 Disconnect the power supply cord and then remove outer case 11 Open the door and block it o...

Page 22: ...tate when power is supplied 2 Indicator Circuit This circuit consists of 25 segments and 4 common elec trodes 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...

Page 23: ...ch sound B Completion sound 15 P53 OUT Used for initial balancing of the bridge circuit absolute humidity sensor 16 P52 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 17 P51 OUT Used for initial balancing of the bridge circuit absolute humidity sensor 18 P50...

Page 24: ...touched 36 P24 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P43 P46 terminal while one of G5 line keys on key matrix is touched 37 P23 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P43 P46 terminal while one of G4 line keys on key matrix is touched 38 P22 OUT Key strobe signal Signal applied to touch key section A pulse...

Page 25: ...72 SEG3 SEG0 OUT Segment data signal Signal similar to SEG27 73 74 VCC VREF IN Connected to GND 75 AVSS IN Connected to VC 76 COM3 OUT Common data signal COM3 Connected to LCD signal C3 Pin No 29 77 COM2 OUT Common data signal COM3 Connected to LCD signal C2 Pin No 28 78 COM1 OUT Common data signal COM3 Connected to LCD signal C1 Pin No 27 79 COM0 OUT Common data signal COM3 Connected to LCD signa...

Page 26: ...ned on in such a way as to change the resistance values in parallel with R107 R111 of IC2 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humiditysensorandAN0terminaloftheLSI Thevoltage of AN1 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 sen...

Page 27: ...o the oven door being closed Connect an external power source to the power input 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 4 Servicing Tools Tools required to service the touch control panel assem bly 1 Soldering...

Page 28: ...NG FOR WIRING 1 Disconnect the power supply cord 2 Make sure that a definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position with one hand then push the door open button with the other this causes the latch leads to rise it is then possible to hear a click as the door switches operate 3 Visuallycheckthedoorandcavityfaceplatefordamage dents cracks sig...

Page 29: ... receptacle into terminal insulator 2 Close covers of the terminal insulator as shown below 3 Reconnect all leads removed from components during testing 4 Reinstall the outer case cabinet 5 Reconnect the power supply cord after the outer case is installed 6 Run the oven and check all functions Terminal insulator Flat type screw driver RECEPTACLE COVERS TERMINAL INSULATOR REPLACEMENT CAUTION 1 DISC...

Page 30: ...tron 6 Remove the chassis support from oven 7 Carefully remove the four 4 screws holding magnetron to waveguide flange 8 Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna 9 Now the magnetron is free Re install 1 Re install the magnetron to waveguide flange with the four 4 screws as shown in Figure C 1 2 Insert the two 2 tabs of the chassis support ...

Page 31: ...ade 5 Install the fan blade to the shaft of fan motor by pushing thefanbladewithasmall lightweight ball peenhammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be disfigured Make sure that the fan blade rotates smooth after installation Make sure that the axis of the shaft is not slanted 6 Catch three holes of fan duct on three tabs of the waveg...

Page 32: ...ch 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 Latch Hook Door Sensing Switch Monitor Switch Secondary Interlock Switch Switch Lever Latch Heads Door Figure C 6 Latch Switch Adjustments Side View Rear View Shaft Table Center of bracket 1 Disconnect the power s...

Page 33: ...r frame Refer to Figure 4 DOOR REPLACEMENT 3 4 View front side of door frame 16 Now door screen is free RE INSTALL 1 Re install door screen to door frame by reversing the procedure of item 15 of REMOVAL 2 Re installthelatchspringtothelatchhead Re installthe latch spring to the door frame Re install latch head to door frame 3 Re install door panel to door frame by fitting nine 9 tabs of door frame ...

Page 34: ... Figure C 8 Door Replacement SEALER FILM Installation 1 Put the adhesive tape on the backing film of the sealer film as shown in Fig C 9 2 Tear the backing film by pulling the adhesive tape 3 Put the pasted side of the sealer film on the door panel Sealer film Backing film Adhesive tape Figure C 9 Sealer film ...

Page 35: ...t POWER TRANSFORMER COM NO CN A 1 2 WHT NOTE The grounding GRN wire of the power supply cord has been grounded by screw The screw must always be kept tight NOTE The neutral WHT wire must be connected to the neutral WHT wire of the power supply cord BLK BLK GRY RED WHT YLW WHT BLK GRY GRN GRY GRN R E D WHT GRY BLK BLK BLK WHT COM RED RED N O RY2 YLW BLK COM YLW YLW N O RY1 BLUE MARK BLK BLK OVEN TH...

Page 36: ...CH NOTE IF NOT SPECIFIED 1 4w 5 IF NOT SPECIFIED 1SS270A TURNTABLE MOTOR OVEN LAMP FAN MOTOR TURNTABLE MOTOR OVEN LAMP FAN MOTOR WH 1 R4 27 R5 4 7k R2 680 1 2w R6 3 3k SP1 VRS1 C1 0 1µ 50v C3 0 1µ 50v ZD1 HZ16 1 C4 10µ 35v C5 10µ 35v R3 510 1 2w C2 1000µ 35v R1 2 4k J1 D5 D3 D4 D2 D1 a c d b D6 RY1 D7 D8 RY2 J2 Q2 2SB1238 2SB1238 Q1 D1 D4 11ES1 Q3 DTD143ES VR VR VR VA LD1 LD5 LD1 LD2 LD3 LD4 LD5 N...

Page 37: ... G12 5 4 3 2 1 0 9 8 7 6 P14 45 46 47 1 VL2 2 VL1 3 AN7 4 AN6 5 AN5 6 AN4 7 AN3 8 AN2 9 AN1 10 AN0 11 P57 12 P56 13 P55 14 P54 15 P53 16 P52 17 P51 18 P50 19 P47 20 P46 21 P45 22 P44 23 P43 24 26 P40 25 P41 VL3 VCC G12 C 2 C 3 C 4 C 5 C 6 C 7 C 8 C 9 VA GND VC INT BUZZER RY1 RY2 NOTE IF NOT SPECIFIED 1 10W 5 DOOR SWITCH G11 G10 G 9 G 8 G 7 G 6 G 5 G 4 G 3 G 2 G 1 IF NOT SPECIFIED 1SS355 IF NOT SPE...

Page 38: ... Board of Power Unit WH 1 WH 1 SH B SH A LD1 DIP LD2 1 C3 C4 C5 R3 C2 F C1 10 D4 D2 D1 D3 D9 D10 RY3 CN D D8 ZD1 VRB D U R2 R1 R6 R5 SP1 3 E B D6 D5 Q2 R4 2 6 11 P S RY2 T1 AC VRS1 QKITPB026MRE0 5 D7 OMIF D U 9 8 7 E Q1 B 4 E RY1 AC OL TTM FM B Q3 CN C CN C CN B CN A LD3 LD4 LD5 1 1 1 9 12 2 1 1 1 2 XA VH 2 2 ...

Page 39: ...itch harness A SH A 1 AD 3 1E FW VZA197DRE0 Switch harness B SH B 1 AD 3 1F LHLD A171WRF0 LED holder 1 AE C1 RC KZA087DRE0 Capacitor 0 1 uF 50V 1 AB C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AD C3 RC KZA087DRE0 Capacitor 0 1 uF 50V 1 AB C4 5 VCEAB31VW106M Capacitor 10 uF 35V 2 AB D1 4 VHD11ES1 1 Diode 11ES1 4 AB D5 8 VHD1SS270A 1 Diode 1SS270ATA 4 AA LD1 5 VHPSLZ381A9 3 Light emitting diode 5 AC Q1...

Page 40: ... PCUSUA126WRP0 Cushion 1 AC DOOR PARTS 5 1 FDORFA318WRT0 Door panel 1 BE 5 2 PSHEPA382WRE0 Sealer film 1 AH 5 3 GWAKPA547WRR0 Door frame R 320BK 1 AZ 5 3 GWAKPA549WRR0 Door frame R 320BW 1 AZ 5 3 GWAKPA561WRR0 Door frame R 320BB 1 AZ 5 4 HPNL A684WRR0 Door screen R 320BK 1 AT 5 4 HPNL A690WRR0 Door screen R 320BW 1 AT 5 4 HPNL A684WRR0 Door screen R 320BB 1 AT 5 5 LSTPPA139WRF0 Latch head 1 AF 5 6...

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

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 5 2 5 7 5 1 5 3 5 6 Actual wire harness may be different from illustration 6 4 6 3 CAPACITOR 5 4 6 5 5 8 5 5 4 18 3 2 3 4 3 3 3 3 3 3 5 3 5 3 5 3 1F 3 1 3 3 1 3 3 2 ...

Page 43: ...D ASSEMBLY FPADBA341WRK0 PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCD024WRE0 R 320BK SPAKCD025WRE0 R 320BW SPAKCD064WRE0 R 320BB BOTTOM PAD ASSEMBLY FPADBA342WRK0 6 2 TURNTABLE TRAY 6 8 INSTRUCTION BOOK PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PACK SPADFA397WRE0 INTO THE OVEN CAVITY CABINET COVER for R 320BK BB SPAKHA003WRE0 ...

Page 44: ...T 1997 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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