Sharp R-21LCF - Oven Microwave 1000 W Service Manual Download Page 32

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R21LCF

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[3] Printed Wiring Board (Figure S-3)

Figure S-3. Printed Wiring Board

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Summary of Contents for R-21LCF - Oven Microwave 1000 W

Page 1: ...e without notice In the interest of user safety the oven should be restored to its original condition and only parts identical to those specified should be used WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current con tact with following parts may result in a severe possibly fatal electrical shock High Voltage Capacitor High Voltage Powe...

Page 2: ...ITOR FUSE TEST 8 3 10 Procedure I NOISE FILTER TEST 8 4 11 Procedure J CONTROL PANEL ASSEM BLY TEST 8 4 12 Procedure L RELAY TEST 8 5 13 Procedure M FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 8 5 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PANEL 9 1 2 SERVICING FOR TOUCH CONTROL PANEL 9 1 CHAPTER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER 1 Employing lead free solder 10 1 ...

Page 3: ...components in the interlock monitor door seal and microwave generation 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 a...

Page 4: ...gh voltage 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 2 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 capa...

Page 5: ...he 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 Cooking M...

Page 6: ... and hinges are not defective C The 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 3 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the follo...

Page 7: ...e Dimensions Width 20 1 2 520mm Height 12 1 8 309mm Depth 16 406mm Cooking Cavity Dimensions Width 13 7 8 353mm NOTE Internal capacity is calculated by measuring Height 8 1 8 207mm maximum width depth and height Depth 14 5 8 370mm Actual capacity for holding food is less Control Complement Light Up Dial 6 minutes No cooking control Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHH...

Page 8: ...ptacle or have a grounding adapter properly grounded and polarized If the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG 2 OVEN DIAGRAM 1 OVEN 1 Back splash cover 2 Sid...

Page 9: ... motor the cooling fan motor and the high voltage components are 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 sec ondary interlock switch and control relay RY1 and is mechanically associated with the door so that it will function in the foll...

Page 10: ...r B on the latch hook while the door is closed The latch switch lever B is activated by the lower latch head The switch is intended to render the oven inoperative by means of blowing the mon itor fuse when the contacts of the primary interlock relay RY1 and secondary interlock switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contacts close to the O...

Page 11: ...O of the pri mary interlock relay RY1 and secondary interlock switch remain closed with the oven door open and when the monitor switch closes 2 If the wire harness or electrical components are shortcircuited this monitor fuse blows to prevent an electric shock or fire hazard 7 THERMAL CUT OUT 145 C MAGNETRON This thermal cut out protects the magnetron against overheating If the temperature goes up...

Page 12: ...block it open 3 Discharge high voltage capacitor 4 Reconnect the leads to the primary of the power transformer 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 1 TROUBLESHOOTING CHART Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected TE S T PR OCE...

Page 13: ...rature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be 34 7 to 64 6 F 19 3 to 35 9 C rise in tempera ture If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magne...

Page 14: ...hermal cut out and check 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 ...

Page 15: ...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 Procedure G MONITOR SWITCH 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 Before performing this test ma...

Page 16: ...tions 11 Procedure J CONTROL PANEL ASSEMBLY TEST WARNING To prevent an electric shock do not touch the electrical parts and the printed wiring board Because the control unit is TRANSLESS CIR CUIT and many electrical parts are used at A C line voltage The control panel consists of circuits including semiconductors such as LSI ICs etc Therefore unlike conventional microwave ovens proper main tenance...

Page 17: ...ntrol unit is defective NOTE The voltage under the condition when all LEDs light up 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 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 ...

Page 18: ...hat procedure re connect the power supply cord 7 Follow the troubleshooting guide given below for repair 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 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 insta...

Page 19: ...edures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so To perform the servicing power to the touch control panel is available either from the power line of the oven itself or from an exter nal power source 1 Servicing the touch control panel with power supply of the oven CAUTION THE HIGH VOLTAGE TRANSFORMER OF THE MICRO WAVE OVEN...

Page 20: ...Oscilloscope Single beam frequency range DC 10MHz type or more advanced model 3 Others Hand tools 4 Other Precautions 1 Before turning on the power source of the control unit remove the aluminium foil applied for preventing static electricity 2 Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted 3 After aluminium foil is removed be careful that ...

Page 21: ...s adjusted accordingly 3 Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosion of...

Page 22: ...ng the oven WARNING AGAINST HIGH VOLTAGE 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 operat ing the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket o...

Page 23: ...e chassis support and the oven cavity 9 Move the air intake duct to the left 10 Carefully remove four 4 screws holding magnetron to waveguide when removing the screws hold the magnetron to prevent it from falling 11 Remove the magnetron from the waveguide with care so the mag netron antenna is not hit by any metal object around the antenna CAUTION WHEN REPLACING THE MAGNETRON BE SURE THE R F GASKE...

Page 24: ... a pair of groove joint pliers CAUTION MAKE SURE THAT ANY PIECES DO NOT ENTER THE GAP BETWEEN THE ROTOR AND THE STATOR OF THE FAN MOTOR BECAUSE THE ROTOR IS EASY TO BE SHAVEN BY PLIERS AND METAL PIECES MAY BE PRO DUCED 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 11 Remove the fan blade assembly...

Page 25: ...t Figure C 3b Power Supply Cord Replacement 12 DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1 REMOVAL 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the control panel assembly referring to section of CON TROL PANEL ASSEMBLY REMOVAL 5 Disconnect the leads from all switches 6 Remove t...

Page 26: ...n 0 5mm when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch hook pushing and pulling lower portion of the door toward the oven face Both results play in the door should be less than 0 5mm 2 The door sensing switch and secondary interlock switch interrupt the circuit before the doo...

Page 27: ...rocedures 2 An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards Refer to chapter Test Procedures 3 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 ca...

Page 28: ... Install the ceramic shelf to the oven cavity bottom plate Refer to INSTALLATION OF CERAMIC SHELF Figure C 9 Derection of Antenna Motor Shaft and Stirrer Antenna Assembly Figure C 10 Stirrer Antenna Assembly Installation 16 INSTALLATION OF CERAMIC SHELF 1 Disconnect the power supply cord 2 Open the door and block it open 3 Make sure that the smooth surface of the ceramic shelf face up 4 Make sure ...

Page 29: ...vity bottom plate 7 Now the ceramic shelf is installed WARNING Make sure that the rubber packing is not caught between the oven door and the oven cavity front plate to avoid possible exposure to excessive microwave energy R ear E dge Push Front E dge Ceramic S helf Oven Cavity ...

Page 30: ...H V R E CTIFIE R P OWE R T R ANS F OR ME R G R N P OWE R S UP P LY C OR D C OM WHT WHT OR G WHT WHT N C N O C OM C ONNE C T OR OR G OR G WHT B LU B R N ANT E NNA MOT OR MONMIT OR S WIT C H P R IMAR Y INT E R LOC K R E LAY WHT B LU B LU R E D OR G R E D OR G OR G 2 3 4 5 1 Y LW P NK B LU C N A R Y 2 R Y 1 NE UT R AL HOT E AR T H P NK Y LW N O C OM DOOR S E NS ING S WIT C H S E C ONDAR Y INT E R LOC...

Page 31: ...K R3 ZD4 ZD5 HZ6C3 X 2 R22 4 7K D74 D7 5 D76 D7 7 D78 D79 D80 D81 D82 D83 D84 D85 14 VDD D3 1 D4 2 N F 15 D5 3 6 P20 7 P21 9 RESET 10 CNVSS 11 XOUT 12 XIN 13 VSS 8 P22 D6 4 D7 5 INTO 16 25 26 27 28 29 30 31 32 D2 D1 D0 P13 P12 P11 P10 P03 P02 24 P01 23 P00 22 19 AIN1 18 AIN0 17 INT1 AIN3 21 AIN2 20 4 7K 4 7K 4 7K VRS1 10G471K R7 27K J5 J7 6 2K J4 J6 C4 0 1u 50V R20 R21 4 7K LD20 15M LD 5 2M LD3 1M...

Page 32: ...Q1 E B J P 14 J P 20 J P 18 J P 9 J P 19 J P 7 ZD1 ZD5 ZD4 ZD2 ZD3 D10 D11 D20 D21 J P 17 J P 13 J P 8 J P 1 R 3 S P 1 CF1 J P 16 J P 15 J P 32 J P 25 1 2 3 4 5 6 8 9 10 11 12 13 14 7 J P 35 J P 37 LD8 LD9 LD10 LD11 LD12 LD13 LD14 LD15 LD16 LD17 LD18 LD19 LD20 LD1 LD2 LD3 LD4 LD5 LD6 LD7 SW1 J P 29 J P 24 J P 27 J P 28 J P 33 J P 26 D84 D83 D75 D79 D82 D85 B C A ZD6 R 2 C5 C3 R 1 C1 D1 D3 D4 D2 J ...

Page 33: ...sh the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250V PartsGuide 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS INDEX CONTENTS INSTRUCTION BOOK TOP PAD ASSEMBLY FPADBA385WRK0 BOTTOM PAD ASSEMBLY FPADBA386WRK0 WRAP COVER SSAKHA034WRE0 DOOR PROTECTION SHEET SPADPA204WRE0 PACKING CASE S...

Page 34: ... 7 7 4 30 4 24 4 24 2 4 4 10 6 1 2 1 4 14 4 20 7 1 4 8 2 3 7 8 7 12 4 11 1 14 1 2 4 29 4 20 4 22 4 34 7 3 4 25 7 3 7 1 1 4 6 3 6 6 1 12 1 4 4 24 4 36 7 1 7 9 7 8 7 2 1 7 7 7 1 6 2 4 4 17 4 39 2 2 4 13 4 12 4 31 7 11 7 12 7 10 4 26 4 26 4 2 4 19 4 23 4 40 4 21 4 21 4 21 4 1 7 6 7 13 7 13 7 13 4 9 4 32 4 18 4 16 1 10 1 9 4 28 6 5 x2 6 2 4 27 4 20 4 20 4 37 4 38 ...

Page 35: ...PRCA108WRE0 AC Latch lever spring 4 7 MSPRTA191WRE0 AC Switch lever B spring 4 8 PHOK A160WRFZ AN Latch hook 4 9 FDUC A341WRY0 BL Steam duct sub assembly 4 10 PSKR A351WRP0 AY Steam guide 4 11 LBNDKA136WRP0 AQ HV capacitor holder 4 12 NFANJA029WRE0 AK Fan blade 4 13 PDUC A888WRFZ AM Fan duct 4 14 FPLT A007WRY0 BB Stirrer antenna assembly 4 15 PCUSGA504WRP0 AB Insertion cushion 4 16 PSKR A348WRW0 A...

Page 36: ...ew 4mm x 8mm 7 8 XHTS740P08000 AC Screw 4mm x 8mm 7 9 XHPS730P06000 AB Screw 3mm x 6mm 7 10 XHTS740P08RV0 AG Screw 4mm x 8mm 7 11 XOTS740P12000 AA Screw 4mm x 12mm 7 12 XOTS740P08000 AA Screw 4mm x 8mm 7 13 XOTWW40P10000 AA Screw 4mm x 10mm 7 14 XOTS840P08000 AB Screw 4mm x 8mm 1 OVEN PARTS ...

Page 37: ... wire harness may be different from illustration 5 1 6 5 2 5 4 5 1 4 5 6 8 6 7 5 1 15 5 1 7 5 1 8 5 1 8 5 1 9 5 1 13 5 1 17 5 1 11 5 1 3 5 1 4 1 5 1 1 5 1 4 5 5 1 12 5 1 12 5 1 14 5 1 18 5 1 4 5 1 17 5 1 2 5 1 16 5 1 16 5 1 16 5 1 16 x4 x2 6 9 5 3 5 1 5 1 5 5 1 10 5 1 4 3 5 1 4 4 5 1 4 2 ...

Page 38: ...AN Glass stopper U 5 1 4 3 PGLSPA516WRE0 AU Front door glass 5 1 4 4 PSLDMA198WREZ BB Sealer plate 5 1 4 5 XETS740P08000 AA Screw 4mm x 8mm 5 1 5 GWAKPA580WRM0 AQ Door handle 5 1 6 JHNDMA040WRW0 AN Handle lever 5 1 7 LANGKA874WRW0 AR Latch lever 5 1 8 LSTPPA181WRF0 AL Latch head 5 1 9 MSPRTA190WRE0 AD Latch spring 5 1 10 PCUSUA506WRP0 AC Cushion 5 1 11 XEPS740P06000 AA Screw 4mm x 6mm 5 1 12 PSHEP...

Page 39: ...0 AC PCUSUA507WRP0 1 4 36 AC PCUSUA508WRP0 2 5 1 18 AC PCUSUA511WRP0 1 4 25 AC PCUSUA514WRP0 1 4 27 AB PCUSUA517WRP0 1 4 37 AE PCUSUA518WRP0 1 4 39 AC PDUC A888WRFZ 1 4 13 AM PDUC A966WRFZ 1 4 28 AT PFILWA060WRP0 1 4 29 AD PGLSPA516WRE0 2 5 1 4 3 AU PHOK A160WRFZ 1 4 8 AN PPACGA171WRE0 2 5 4 AK PRNGFA001WRF0 2 3 6 AC PSHEPA644WRE0 1 4 30 AD PSHEPA649WRE0 2 5 1 2 AB PSHEPA673WRE0 1 4 40 AD PSHEPA67...

Page 40: ...out prior written permission of the publisher COPYRIGHT XXXX BYSHARP CORPORATION ALL RIGHTS RESERVED COPYRIGHT 2006 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in anyform or by any means electronic mechanical photocopying re cording or other wise without prior written permission of the publisher ...

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