Sharp R-239 Service Manual Download Page 1

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CHAPTER 1. BEFORE SERVICING

CHAPTER 2. WARNING TO SERVICE PERSONNEL

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 4. APPEARANCE VIEW

CHAPTER 5. OPERATION SEQUENCE

CHAPTER 6. FUNCTION OF IMPORTANT COMPO-
NENTS

CHAPTER 7. TROUBLESHOOTING GUIDE

CHAPTER 8. TEST PROCEDURES

CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY

CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER

CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE

CHAPTER 12. MICROWAVE MEASUREMENT

CHAPTER 13. TEST DATA AT A GLANCE

CHAPTER 14. CIRCUIT DIAGRAMS

Parts Guide

No. S5506R239PHWS

MICROWAVE OVEN

R-239(IN)

R-239(W)

SERVICE MANUAL

R239(W)

MODELS

CONTENTS

SHARP CORPORATION

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

Summary of Contents for R-239

Page 1: ...SOLDER CHAPTER 11 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CHAPTER 12 MICROWAVE MEASUREMENT CHAPTER 13 TEST DATA AT A GLANCE CHAPTER 14 CIRCUIT DIAGRAMS Parts Guide No S5506R239PHWS MICROWAVE OVEN R 239 IN R 239 W SERVICE MANUAL R239 W MODELS CONTENTS SHARP CORPORATION This document has been published to be used for after sales service only The contents are subject to change without notice I...

Page 2: ...ure J HIGH VOLTAGE FUSE F2 TEST 8 4 11 Procedure K TOUCH CONTROL PANEL ASSEMBLY TEST 8 4 12 Procedure L SWITCH UNIT TEST 8 4 13 Procedure M RELAY RY1 RY2 TEST 8 5 14 Procedure N PROCEDURES TO BE TAK EN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN 8 5 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PANEL 9 1 2 DESCRIPTION OF LSI 9 1 3 SERVICING FOR TOUCH CONTROL ...

Page 3: ...is tightly closed B The door brackets 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 engineers Removal of the outer wrap gives access to potentials above 250V All the parts marked on parts list may cause undue microwave exp...

Page 4: ...magnetron or other microwave generating devices if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized ...

Page 5: ...ct the leads to the primary of the high voltage transformer Ensure that these leadsre main isolated from other components and the oven chas sis Use insulation tape if necessary When the testing is completed carry out 3D checks and reconnectthe leads to the primary of the high voltage transformer Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity pl...

Page 6: ...R239 W 2 2 ...

Page 7: ...R239 W 2 3 ...

Page 8: ...al capacity is calculated by measuring maximum width depth and height Height 211 mm Actual capacity for holding food is less Depth 336 mm Turntable diameter 272 mm Control Complement Touch Control System Timer 0 99 minutes 90 seconds Clock 1 00 12 59 or 0 00 23 59 Microwave Power for Variable Cooking Repetition Rate 100P Full power throughout the cooking time 70P approx 70 of FULL Power 50P approx...

Page 9: ...light up just above each symbol according to the instruction When an indicator is flashing do the necessary operation Stir Turn over Weight Microwave power level Cooking in progress 3 EXPRESS COOK DEFROST button Press to select one of the 12 automatic programmes 4 MICROWAVE POWER LEVEL button 5 STOP button 6 START 1min button 7 TIMER WEIGHT knob NOTE Some one touch cooking features such as START 1...

Page 10: ... SW2 is mechanically controlled by oven door and monitors the operation of the 1st latch switch SW1 the relay RY1 and the 2nd interlock relay RY2 1 When the oven door is opened during or after the cycle of a cooking program the 1st latch switch SW1 and 2nd interlock relay control switch SW3 must open their contacts first After that the contacts COM NC of the monitor switch SW2 can be closed 2 When...

Page 11: ...re short circuited the fuse F1 T6 3A blows to prevent an electric shock of fire hazard 5 HIGH VOLTAGE FUSE F2 The high voltage fuse F2 blows when the high voltage rectifier or the magnetron is shorted 6 TEMPERATURE FUSE TF 150C OVEN The temperature fuse TF located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produce...

Page 12: ...RD SHORTED WIRE HARNESS OPENED WIRE HARNESS OVEN LAMP OL WALL OUTLET MISADJUSTMENT SWITCH HOME FUSE OR BREAKER BLOCKED COOLING FAN BLOCKED VENTILATION NOISE FILTER SWITCH UNIT H V FUSE F2 OFF CONDITION PROBLEM CONDITION POSSIBLE CAUSE AND DEFECTIVE PARTS TEST PROCEDURE ON CONDITION A B C CK D E E E F G G H K M N I L J M RE CKCK RE CK CK CK CK CK Home fuse blows when pow ersupply cord is plugged in...

Page 13: ...test 3 Temperature of the water The initial temperature of the water is 10 1 C 4 Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5 C 5 Select stirring devices and measuring instruments in order to minimize addition or removal of heat 6 The graduation of the thermometer must be scaled by 0 1 C at minimu...

Page 14: ...o its highest range Connect the ohmmeter across the terminal of the high voltage rectifier and note the reading obtained Reverse the meter leads and note this second reading The normal resistance is infinite in one direction and more than 100 kΩ in the other direction CARRY OUT 4R CHECKS NOTE FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A V...

Page 15: ...2 If the fuse F1 T6 3A is blown by incorrect door switching replace the defective switch es and the fuse F1 T6 3A If the fuse F1 T6 3A is blown there is a shorts or grounds in electrical parts or wire harness Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION ONLY REPLACE FUSE F1 T6 3A WITH THE CORRECT VALUE REPLACEMENT 9 Procedure I NOISE FILTER TEST...

Page 16: ... replacing the switch unit perform the Switch unit test Procedure L to determine if control unit is faulty 1 In connection with buttons a When touching the buttons a certain group of buttons do not produce a signal b When touching the buttons no buttons produce a signal 2 In connection with indicators a At a certain digit all or some segments do not light up b At a certain digit brightness is low ...

Page 17: ...ollow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS NOTE At the time of making these repairs make a visual inspection of the varistor Check for burned damage and examine the transformer with a tester for the presence of layer short circuit check the primary coil resistance If any abnormal condition is detected replace the defectiv...

Page 18: ...com pose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 7 2nd Interlock Relay Control Switch A switch to tell the LSI if the door is open or closed 8 Back Light Circuit A circuit to drive the back light Light emitting diodes LD1 LD4 2 DESCRIPTION OF LSI The I O signal of the LSI are detailed in the following table Symbol Voltag...

Page 19: ...o detect the voltage of the signal coming from the touch key 51 AVSS IN A D converter power source voltage The power source voltage to drive the A D converter in the LSI 52 P11 IN To input signal which communicates the door open close information to LSI Door close H level signal 0V Door open L level signal 5V 53 P10 OUT Terminal not used 54 P33 OUT Switch unit strobe signal Signal applied to switc...

Page 20: ... oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is so long enough that they may be separated from each other For those models therefore it is possible to ...

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: ... leads touch to the following parts 1 High voltage parts Magnetron High voltage transformer High voltage capacitor High voltage rectifier assembly and High voltage fuse 2 Hot parts Oven lamp Magnetron High voltage transformer and Oven cavity 3 Sharp edge Bottom plate Oven cavity Waveguide flange and other metallic plate 4 Movable parts to prevent a fault Fan blade Fan motor Turntable motor and Swi...

Page 23: ...connect the wire leads from the magnetron 3 Remove the two 2 screws holding the air duct to the oven cavity 4 Release the air duct from the oven cavity 5 Carefully remove the four 4 screws holding the magnetron to the waveguide flange 6 Lift up magnetron with care so that the magnetron antenna is not hit by any metal object around antenna 7 Now the magnetron is free 2 REINSTALLATION 1 Reinstall th...

Page 24: ...the center of the bracket which supports the shaft of the fan motor on the flat table 3 Apply the screw lock tight into the hole for shaft of the fan blade 4 Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet CAUTION DO NOT HIT THE FAN BLADE STRONGLY WHEN INSTALLED BECAUSE THE BRACKET MAY BE TRANS FORMED MAKE SURE TH...

Page 25: ...a misadjustment the following adjustment should be made 2 Loosen the two 2 screws holding latch hook to the oven cavity front flange 3 With door closed adjust latch hook by moving it back and forth and up and down In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0 5mm The vertical position of the latch hook should be adjusted so that the 1st...

Page 26: ...f door frame to ten 10 holes of door panel 5 Put sealer film on door panel Refer to Sealer Film about how to handle new one 6 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges 7 Re install choke cover to door panel by pushing NOTE After any service to the door 1 Make sure that 1st latch switch 2nd interlock relay control switch and monitor switch are operating properly Re...

Page 27: ...mance standard for microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M 2 Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non co...

Page 28: ...oltage fuse F2 0 6A 5kV Temperature fuse TF 150 C Oven lamp OL 240V 25W High voltage capacitor C 0 91μF AC 2100V Magnetron MG Filament 1Ω Filament chassis ohm High voltage transformer T Filament winding 1Ω Secondary winding Approx 208Ω Primary winding Approx 2 7Ω WARNING DISCONNECT THE PLUG WHEN MEASURING RESISTANCE ...

Page 29: ... SWITCH SW3 2ND INTERLOCK RELAY CONTROL SWITCH OL FM TTM N O COM COM RY 1 RY 2 EARTH 230V 50Hz BLU BRN LIVE NEUTRAL G Y F1 FUSE T6 3A N L NOISE SUPPRESSION COIL NOISE FILTER TF TEMP FUSE F2 H V FUSE 0 6A B1 B2 NOTE indicates components with potentials above 250V N O H V RECTIFIER TURNTABLE MOTOR FAN MOTOR OVEN LAMP CONTROL UNIT 2ND INTERLOCK RELAY OL FM TTM N O COM COM RY 1 RY 2 EARTH BLU BRN LIVE...

Page 30: ...NTROL PANEL GRY CN B CN H 2 1 N O T1 RY1 N O RY2 GRY GRY RED BLK WHT CN B 2 1 GRN GRY COM N O GRY C HIGH VOLTAGE CAPACITOR F2 HIGH VOLTAGE FUSE H V RECTIFIER HIGH VOLTAGE COMPONENTS MG MAGNETRON TTM TURNTABLE MOTOR T HIGH VOLTAGE TRANSFORMER RED RED GRY RED WHT WHT ORG F1 FUSE LIVE NEUTRAL FM FAN MOTOR BLU GRY RED OL OVEN LAMP RED BRN BLU L N WHT RED Power Supply Cord Oven Cavity Back Plate Screw ...

Page 31: ...4 4 7K R40 4 7K R30 3 3K R10 15K C11 0 01uF 50V R7 4 7K R8 4 7K R9 4 7K C3 C60 C63 330pF 50V x 4 R60 R63 270K x 4 R80 11KF C4 0 01uF 50V R6 15K C40 0 01uF 50V D40 D22 J1 C12 VRS1 10G471K C5 C1 C6 220uF 10V ZD2 HZ5C2 ZD21 J10 12K J11 15K AIN2 AIN3 AIN4 AIN5 J12 J13 J14 J15 J16 J17 C10 HZ4A2 10uF 35V 1000uF 35V C21 Q21 DTD143ES Q2 2SB1238 LD1 LD2 LD3 LD4 D5 D6 SP1 C20 T1 PA145DR a b d c D1 D4 1N4002...

Page 32: ...DIP CN G IC SIDE 10 1 1 2 CN B D22 CN H D40 Q2 R1 C12 ZD2 J1 ZD3 R20 JUMP2 JUMP3 R2 B E JUMP1 JUMP4 JUMP A SP1 C6 R3 D5 D6 C1 R21 C5 R22 T1 VRS1 P S D20 Q23 B B B E E E C21 Q22 Q21 D2 D1 D3 D4 ZD1 RY1 RY2 D21 d a b c Figure S 3 Printed Wiring Board of Power Unit Figure S 4 Printed Wiring Board of Switchr Unit ...

Page 33: ...4 DESCRIPTION Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250V 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS INDEX SPAKCE226WREZ R 239 W SPAKCE227WREZ R 239 IN 6 1 TURNTABLE TRAY 6 4 INSTRUCTION BOOK 6 2 TURNRTABLE SUPPORT INTO THE OVEN CAVITY Not replaceable items TRAY PAD ASSY CPADBA287WRKZ PACKING CASE MICROWAVE OVEN TOP PAD ASSEMBLY FPADBA598WRKZ PO...

Page 34: ... 7 8 7 9 7 9 OL 6 3 7 7 FM 1 1 7 1 2 2 4 1 4 10 4 2 7 8 7 9 7 9 7 8 7 7 4 3 6 1 6 2 7 8 7 6 7 8 4 9 MG 7 1 4 5 4 11 4 8 7 8 F1 7 8 7 6 4 4 4 12 4 7 7 7 7 1 C F2 SW3 SW2 7 3 7 4 7 10 7 6 7 2 7 1 SW1 TTM 1 2 2 3 2 3 T 7 1 4 6 TF 1 3 7 5 7 8 ...

Page 35: ...A014WRE0 AG Temperature fuse 150C Oven TTM RMOTDA265WRZZ AS Turntable motor TTM RMOTDA173WRE0 AX Turntable motor Interchangeable TTM RMOTDA253WRZZ AV Turntable motor Interchangeable CABINET PARTS 2 1 GCABUA958WRPZ BE Outer case cabinet R 239 W 2 1 GCABUA966WRPZ BE Outer case cabinet R 239 IN 2 2 GDAI A377WRWZ AS Bottom plate 2 3 GLEGPA104WREZ AF Foot OVENPARTS 4 1 PHOK A146WRFZ Latch hook 4 2 LBND...

Page 36: ...R239 W 4 2 DOOR AND CONTROL PANEL PARTS 5 2 6 5 5 6 5 4 5 7 5 8 5 9 5 10 5 10 5 1 5 3 5 5 6 4 6 6 3 2 3 1 3 4 3 7 3 8 3 7 3 3 3 5 3 6 3 7 3 7 ...

Page 37: ...239 IN 3 7 XEPS730P08XS0 AA Screw 3mm x 8mm 3 8 PCUSUA173WRP0 AC Cushion DOOR PARTS 5 1 FDORFA397WRTZ BB Door panel assembly 5 2 GWAKPA995WRFZ AW Door frame R 239 W 5 2 GWAKPA996WRTZ AX Door frame R 239 IN 5 3 JHNDMA045WRTZ AP Door handle R 239 W 5 3 JHNDMA047WRTZ AP Door handle R 239 IN 5 4 LSTPPA211WRFZ AG Latch head 5 5 LSTPPA231WRFZ AG Glass stopper 5 6 MSPRTA187WRE0 AC Spring 5 7 PGLSPA633WRE...

Page 38: ...4 3 AG NTNT A034WRF0 1 6 1 AM P PCOVPA419WREZ 1 4 8 AG PCUSGA664WREZ 1 4 12 AF PCUSUA173WRP0 2 3 8 AC PCUSUA501WRP0 1 4 11 AB PDUC A908WRWZ 1 4 4 AR PDUC A909WRPZ 1 4 9 AN PGLSPA633WREZ 2 5 7 AR PHOK A146WRFZ 1 4 1 PPACGA176WREZ 1 4 10 AC PSHEPA782WREZ 2 5 8 AG PSPAJA007WRFZ 1 4 7 AF Q QACC A075WRE0 1 1 1 AW QFS CA027WRZZ 1 F1 AG QFS IA004WRE0 1 F2 AK QFS TA014WRE0 1 TF AG QSW MA085WRE0 1 SW1 AF 1...

Page 39: ......

Page 40: ...itten permission of the publisher COPYRIGHT XXXX BYSHARP CORPORATION ALL RIGHTS RESERVED COPYRIGHT 2005 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stor ed in retrieval systems or transmitted in anyform or by any means electronic mechanical photocopy ing recording or other wise without prior written permission of the publisher 2005 SHARP CORP 05S0 0E_E ...

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