Sharp R-22JT Service Manual Download Page 48

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R-22JT

'04 SHARP CORP. (11S0.610E) Printed in U.S.A

No part of this publication may be reproduced,
stored in retrieval systems, or transmitted in any
form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.

Summary of Contents for R-22JT

Page 1: ...MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING INSIDE FRONT COVER WARNING TO SERVICE PERSONEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLE SHOOTING GUIDE TEST PROCEDURE 10 TOUCH CONTROL PANEL 20 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 30 PICTORIAL DIAGRAM 37 CONTROL PANEL CIRCUIT 38 PRINTED WIRING BOARD 39 PARTS LIST...

Page 2: ...nsmission 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 Microwave Measu...

Page 3: ...e capacitors 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 two high voltage capacitors...

Page 4: ...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 Cooking Mode 5 Close the...

Page 5: ...aged 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 High Voltage Capacitor...

Page 6: ...unded In the event of an electrical short circuit grounding reduces the risk of electric shock by providing an escape wire for the electric current This appliance is equipped with a cord having a grounding wire with a grounding plug The plug must be plugged into an outlet that is properly installed and grounded WARNING Improper use of the grounding plug can result in a risk of electric shock The e...

Page 7: ...TY pad 19 EXPRESS DEFROST pad 20 Ten number pads for time and memory programming 21 SELECTATIME pad 22 STOP CLEAR pad touch to stop operation of oven and clear remaining heating time 23 SELECTAPOWER pad for setting variable power level 24 START pad touch to operate oven after door is closed and time is set 25 SET pad for setting memory 26 CHECK pad for checking memory 27 SIGNAL pad for setting sig...

Page 8: ...ugh the waveguide into the cavity feed box and then into the cavity where the food is placed to be cooked 5 Upon completion of the cooking time the oven will revert to the IDLE condition 6 When the door is opened during a cook cycle monitor switches 1 2 door sensing switch secondary interlock switches 1 2 and primary interlock relays 1 2 are activated with the following results The circuits to the...

Page 9: ...S ON DISPLAY COMMERCIAL FREQUENCY 60HZ POWER OUTPUT BY MAGNETRON 1 POWER OUTPUT BY MAGNETRON 2 OPERATION OF MAGNETRON SECONDARY INTERLOCK SWITCHES DOOR SENSING SWITCHES POWER TRANSFORMER 1 POWER TRANSFORMER 2 CAPACITOR 1 AC 2100V AC 2100V CAPACITOR 2 BLU BLU BLK WHT A1 RY 1 RY 3 RY 2 A7 A7 A3 GRN B2 B1 H3 H1 B3 RED RED RED RED RED BRN BRN WHT WHT WHT WHT WHT WHT WHT WHT H V RECTIFIER 1 H V RECTIFI...

Page 10: ...ON THERMISTOR OVEN THERMISTOR BLK BLK BLK BLK BLK BLK YEL TAB1 TAB2 PRIMARY INTERLOCK RELAY 1 FUSE MONITOR SWITCHES MAG NETRON TEMP FUSE 2 OVEN TEMP FUSE MAG NETRON TEMP FUSE 1 20A NOISE FILTER 120V 60 Hz PRIMARY INTERLOCK RELAY 2 AC 2100V AC 2100V RY 1 RY 3 RY 2 SECONDARY INTERLOCK SWITCHES DOOR SENSING SWITCHES POWER TRANSFORMER 1 POWER TRANSFORMER 2 CAPACITOR 1 CAPACITOR 2 BLU BLU BLK WHT A1 A7...

Page 11: ...en 1 When the door is opened the contact of the door sensing switch and secondary interlock switches 1 2 are opened first then the contact of the monitor switches 1 2 are closed 2 As the door goes to a closed position the contacts of the monitor switches 1 2 are opened first then the contacts of the door sensing switch and the secondary interlock switches 1 2 close 3 If the door is opened and the ...

Page 12: ...ll leads removed from components during testing 5 Reinstall the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions OVEN THERMISTOR The thermistor is a negative temperature coefficient type The temperature in the exhaust duct is detected through the resistance of the thermistor If the temperature is high the control panel wi...

Page 13: ...n oven load food Variable cooking does not operates properly except HIGH power functions EE1 Magnetron 1 failure EE2 Magnetron 2 failure EE3 Magnetron 1 and 2 failure EE6 Oven thermistor failure EE7 Exhaust air temperature is too high EE8 Relay melt short EE9 Maximum time is exceeded EE16 Magnetron thermistor is open EE17 Magnetron temperature is too high PROBLEM POSSIBLE CAUSE AND DEFECTIVE PARTS...

Page 14: ...LD BE OBSERVED Power output 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 o...

Page 15: ...onnect input leads and check for a short or open between the terminals using an ohmmeter Checking with a high ohm scale if the high voltage capacitor is normal the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged If the above is not the case check the capacitor with an ohmmeter to see if it is shorted between either of the terminals ...

Page 16: ...ng 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 NOTE If the door sensing switch contacts fail in the open position and the door is closed the blower motor stirrer motors and oven light will be activated by RY1 PRIMARY INTERLOCK RELAY RY2 RY3 1 Disconnect the power supply cord and then remove ou...

Page 17: ...ilure Test magnetron 1 2 Check blower fan motor and ventilation opening Magnetron 2 Failure Test magnetron 2 and Blower fan motor Food has been burned in oven Temperature of oven inside is very high Oven temperature fuse Magnetrontempera ture fuse 2 Magnetron tem perature fuse 1 150 C 120 C Non resetable type EE1 EE3 EE2 Oven shut off Non resetable type Open Close Display or temperature temperatur...

Page 18: ...r pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal If the Key unit is defective 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge two high voltage capacitors 4 Replace the Key unit 5 Reconnect all leads removed from components during testing 6 Re install the outer case cabinet 7 Reconnect the...

Page 19: ...connect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge two high voltage capacitors 4 If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the do...

Page 20: ...Power transformer 2 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge two high voltage capacitors 11 Reconnect all leads removed from components during testing 12 Re install the outer case cabinet 13 Reconnect the power supply cord after the outer case is installed 14 Run the oven and check all function N RELAY TEST To protect the electron...

Page 21: ...rom other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord 7 Follow the troubleshooting guide given below for repair STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present to power Check supply voltage and oven power cord terminal of CPU connector CN A 2 The rated AC voltage is present at primary Low voltage transforme...

Page 22: ...g Circuit This is a circuit for transmitting output change of thermistor Oven thermistor 1 to IC1 14 Magnetron Temperature Circuit Detect no load This is a circuit for transmitting output change of thermistor Magnetron thermistor to IC1 15 High Voltage Monitoring Circuit This circuit detects problems in the magnetron high voltage circuit by sensing a variation in the current flowing through the pr...

Page 23: ...MISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI 13 14 P55 P54 OUT Magnetron high voltage circuit driving signal To turn on and off the cook relay In 100 power level operation H level during cooking L level otherwise In other power level operation 90 80 70 60 50 40 30 20 10 or...

Page 24: ... OUT Internal clock oscillation frequency control output Output to control oscillation input of XIN 32 VSS IN Connected to GND 33 P27 IN Signal coming from touch key When either one of G 12 line keys on key matrix is touched a corresponding signal out of P30 P31 P32 P33 P34 will be input into P27 When no key is touched the signal is held at L level 34 P26 IN Signal similar to P27 When either one o...

Page 25: ...ne keys on key matrix is touched 61 P33 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P27 P26 P25 and P24 terminals while one of G5 line keys on key matrix is touched 62 P32 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P27 P26 P25 and P24 terminals while one of G6 line keys on key matrix is touched 63 P31 OUT Key strobe...

Page 26: ...istor s with resistance equal to that of the controls are used 2 Servicing the touch control panel with power supply from an external power source Disconnect the touch control panel completely from the oven proper and short both ends of the door sensing switch on PWB of the touch control panel which activates an operational state that is equivalent to the oven door being closed Connect an external...

Page 27: ... 345678 times Flashing 0 1sec BUZZER PAD DISPLAY INDICATOR TONE Door close CHECK CHECK No CHECK 82 68 CHECK user total count SIGNAL SIGNAL DOUBLE 34 56 QUANTITY service total count upper figure 3456XX 1 No 1 1 No after 1 sec 34 56 service total count upper figure 2 No 2 2 No after 1 sec 78 service total count lower figure CHECK 2 Practice for checking total operation time Ex 4567 hours Flashing 0 ...

Page 28: ... stage 1 1 After 10 of total cooking time is passed 9 9 After 90 of total cooking time is passed START A There is no pause OTHER SETTING AND CHECKING PROCEDURE 1 EXPRESS DEFROST T STG1 STG 2 STG3 STG A x T B 1 To set the constants of Express defrost Ex 0 20T 20 40 at 1st stage 0 13T 30 30 at 2nd stage 0 67T 50 20 at 3rd stage Flicker 0 1 sec BUZZER PAD ORDER DISPLAY TONE Door close SET SET NO with...

Page 29: ...K 0633 indicators ON plug off BLANK NOTE 1 This procedure must be performed within 1 minute 2 When IC2 malfunctions the unit does not function normally correct cooking data is not output data is not stored correctly in memory etc 3 Initialization of memory after repairing the touch control panel After repairing the touch control panel reset all counters to 0 including service counter Make sure tha...

Page 30: ...l the outer case when operate the unit JUDGMENT PROCEDURE 1 PREPARATION FOR JUDGMENT 1 Disconnect the plug from the outlet 2 Remove the air filter and unscrew two screws at the control panel lower holding the control panel 3 Push up the control panel and pull it toward 2 JUDGMENT PROCEDURE FOR UPPER MAGNETRON AND ITS CIRCUIT Disconnect the power supply cord Disconnect lead wires to the interlock r...

Page 31: ...ater increased 1 Yes EE1 should be indicated Lower magnetron its driving circuit and parts on the circuit are normal 1 CHECK OF TEMPERATURE RISE Fill approx 453 CC of water in a measuring cup and place it in the oven Operate the oven for one minute Substract cold water temperature from hot water temperature The result should be approx 18 36F 10 20 deg C If EE2 is indicated carry out Test procedure...

Page 32: ...former WARNING 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 pull the door release lever with the other this causes the latch leads to rise it is then possible to hear a click as the door switches operate 3 Visually check the door and cavity face plate for ...

Page 33: ...ring to OUTER CASE REAR CABINET AND POWER SUPPLY CORD REMOVAL 2 Open the oven door and block it open 3 Discharge two high voltage capacitors 4 Remove the upper magnetron from the upper waveguide flange referring to MAGNETRON 1 AND OR 2 REMOVAL 5 Now the upper magnetron with the magnetron thermistor should be free 6 Remove the thermistor angle from the upper magnetron by pulling out 7 Straighten th...

Page 34: ...IF IT IS DEFECTIVE REPLACE THE HIGH VOLTAGE RECTIFIER ASSEMBLY 3 WHEN REPLACING THE HIGH VOLTAGE RECTIFIER ASSEMBLY AND THE HIGH VOLTAGE CAPACITOR THE GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW 1 Disconnect the power supply cord and then remove outer case and rear cabinet referring to OUTER CASE REAR CABINET AND POWER SUPPLY CORD REMOVAL 2 Open...

Page 35: ...TO TOUCH CONTROL PANEL COVER THE TIP OF SCREWDRIVER WITH TAPE CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL Replacement of individual component is as follows CONTROL UNIT AND CONTROL PANEL FRAME WITH KEY 7 Remove one 1 screw holding the decoration metal fittings to the control panel mounting angle 8 Remove two 2 screws holding the control panel mounting angle to the panel frame 9 Lift up the con...

Page 36: ...d Adjustment procedure 1 Disconnect the power supply cord and then remove outer case referring to OUTER CASE REAR CABINET AND POWER SUPPLY CORD REMOVAL 2 Open the oven door and block it open 3 Discharge two high voltage capacitors If the door sensing switch secondary interlock switches 1 2 and monitor switches 1 2 do not operate properly due to a misadjustment the following adjustment should be ma...

Page 37: ...sembly 3 Tighten the upper and lower oven hinge screws DOOR REPLACEMENT After adjustment make sure of the following 1 Door latch heads smoothly catch the latch hook through the latch holes and the latch head goes through the center of the latch hole 2 Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 The door is positioned with its face depressed ...

Page 38: ...three 3 screws holding the joint plate to the door panel 9 Release the latch spring from the tab of the joint lever and joint plate 10 Release the latch heads from joint lever and joint plate 11 Now the latch heads are free DOOR CASE REMOVAL 1 Remove the door assembly from oven cavity referring to DOOR REMOVAL 2 Remove choke cover from door panel referring to CHOKE COVER REMOVAL 3 Remove door hand...

Page 39: ...K B L K HIGH VOLTAGE CAPACITOR HIGH VOLTAGE CAPACITOR H V RECTIFIER H V RECTIFIER MAGNETRON LOWER MAGNETRON UPPER POWER TRANSFORMER POWER TRANSFORMER WHT WHT WHT WHT WHT BLK BLK STIRRER MOTOR LOWER WHT BLK GRN POWER SUPPLY CORD 120V 60Hz WHT WHT BLOWER MOTOR NOISE FILTER AND FUSE MAGNETRON TEMP FUSE 1 150 C OVEN TEMP FUSE 120 C WHT YLW BLU BLK BLK WHT WHT STIRRER MOTOR UPPER WHT WHT BLU WHT WHT WH...

Page 40: ... VSS 1 4 8 5 VCC VEE AVSS VREF AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 P55 P54 P53 P52 P51 P50 P47 P46 P45 P44 P43 P42 INT1 INT0 RESET P71 P70 XIN XOUT VSS 1 5 15 10 20 25 30 33 P30 P31 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 P16 P17 P20 P21 P22 P23 P24 P25 P26 P27 32 35 40 45 50 55 60 64 IC1 IZA633DR CF1 CST4 00MGW R80 4 7k R81 4 7k R82 4 7k R83 4 7k R88 4 7k R87 4...

Page 41: ... RY2 B E Q3 C1 ZD1 R2 R101 R70 R1 Q1 Q23 D22 SP1 R40 10 E B E B D21 D101 C10 J9 R102 Q22 C3 CN B 1 3 1 3 CN H R64 9 R63 C63 C62 C4 J6 1 C8 C64 R62 64 60 R84 C60 R60 D70 D23 R4 8 C70 C101 R71 R61 C61 J5 R65 12 1 CN G CN D R66 5 4 IC3 7 J3 J4 6 1 8 9 16 1 3 2 15 Q2 E B R33 R32 R31 1 4 5 8 IC2 R30 Q60 E B CF1 C6 R3 C7 C5 C31 C30 R5 ZD2 3 20 25 33 F R83 C83 R82 C82 40 R81 C81 R80 C80 IC1 50 55 R58 R57...

Page 42: ... 1B QCNCMA312DRE0 3 pin connector CN B 1 AB 3 1C QCNCMA039DRE0 3 pin connector CN H 1 AB 3 1D QCNCWA030DRE0 12 pin connector CN G 1 AE 3 1E QLUGPA012DRE0 Tab terminal TB1 TB2 2 AB C1 VCEAB51EW228M Capacitor 2200 uF 25V 1 AE C2 VCKYD11HF104Z Capacitor 0 1 uF 50V 1 AB C3 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C4 VCKYD11HF104Z Capacitor 0 1 uF 50V 1 AB C5 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C6 VCK...

Page 43: ...2 2 HDECAA195WRP0 Decoration metal fittings 1 AP 3 2 3 PCUSUA417WRP0 Cushion 1 AB 3 3 LANGTA243WRW0 Control panel mounting angle 1 AF 3 4 XEPSD30P10XS0 Screw control unit mounting 5 AA 3 5 XEPSD40P12000 Screw control panel mounting angle mounting 2 AA 3 6 LX BZA138WREZ Screw decoration panel mounting for earth 1 AB OVEN PARTS 4 1 PGLSPA632WREZ Lamp glass 1 AG 4 2 FDUC A345WRY0 Exhaust duct assembl...

Page 44: ...w 4mm x 10mm 2 AA 5 21 PCUSGA486WRP0 Handle cushion 1 AM 5 22 PSPA A102WRE0 Door case spacer 2 AE MISCELLANEOUS 6 1 TINSEB071WRRZ Instruction manual 1 AH 6 2 TLABHA024WRR0 Menu sticker 1 AH 6 3 FW VZC037WREZ Switch harness 1 AS 6 4 FW VZC036WREZ Main wire harness 1 BG 6 5 LHLDWQ005YBE0 Purse lock LL 1 AA 6 6 LBNDKA079WRE0 Wire holder 2 AB 6 7 TCAUAA289WRRZ DHHS caution label in French 1 AD 6 8 TCA...

Page 45: ...rder Parts from the authorized SHARP parts Distributor for your area Defective parts requiring return should be returned as indicated in the Service Policy TOP PAD ASSEMBLY FPADBA313WRK0 WRAP COVER DOOR PROTECTION SHEET SPADPA552WRE0 PACKING CASE SPAKCE148WREZ DOOR PAD SPADF0341WRE0 6 1 INSTRUCTION MANUAL 6 2 MENU STICKER Not replaceable items BOTTOM PAD ASSEMBLY FPADBA314WRK0 TRAY SUPPORT SPADPA5...

Page 46: ... 5 4 6 1 11 1 11 1 11 4 7 4 10 4 4 7 16 4 25 4 27 4 42 7 16 4 13 7 16 7 12 7 4 7 11 7 4 7 12 7 12 7 2 7 3 7 4 7 12 7 16 7 5 7 4 7 10 7 12 7 15 7 4 7 4 4 26 7 16 7 16 x 2 7 16 2 2 2 2 1 5 1 6 7 12 7 15 6 8 6 14 7 11 7 11 4 12 7 2 7 8 7 6 7 6 4 1 7 13 7 16 4 17 4 21 1 14 7 12 1 6 4 33 4 32 7 16 4 13 7 16 7 6 1 15 1 15 1 3 4 40 1 7 1 3 4 28 6 10 4 29 A1 A2 B 1 10 4 38 4 2 6 6 7 1 2 8 7 1 4 15 4 16 4 ...

Page 47: ...1 3 2 3 6 15 Actual wire harness may be different from illustration 6 4 6 16 6 9 6 12 6 3 5 15 5 16 5 17 5 18 5 4 5 20 5 12 5 22 5 14 5 1 5 9 5 8 5 7 5 6 5 13 5 13 5 2 5 3 5 10 5 5 5 19 5 6 5 5 10 5 11 5 21 To high voltage capacitor To power transformer 6 5 MISCELLANEOUS DOOR PARTS CONTROL PANEL PARTS ...

Page 48: ...BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher ...

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