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R-231NW

6  Pan

COCCION

RECALENTAR

1  Caserola

2  Sopa

3  Pizza

4  Bebida

5  Plato Principal

Derretir

Suavizar

Calentar

Function Rapida

Cronometro

Reloj

Nivel de

Potencia

Comienzo

Detencion

Cancelacion

1  Papa Asada

2  Verdura Fresca

3  Verdura Congelada

4  Entradas Congeladas

Minuto Extra

Descongelacion

Palomitas de Maiz

CONTENTS

PRECAUTIONS TO BE OBSERVED BEFORE AND

DURING SERVICING TO AVOID EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY
BEFORE SERVICING
CHAPTER 1. WARNING TO SERVICE PERSONNEL
CHAPTER 2. MICROWAVE MEASUREMENT PRO-

CEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
CHAPTER 5. GENERAL INFORMATION
CHAPTER 6. OPERATION

S3911R231NPAL

MICROWAVE OVEN

R-231NW

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

WARNING TO SERVICE PERSONNEL: Microwave ovens
contain circuitry capable of producing very high voltage
and current, contact with following parts may result in a se-
vere, possibly fatal, electrical shock. (High Voltage Capaci-
tor,

 High Voltage Power Transformer, Magnetron, High 

Voltage Rectifier Assembly, High Voltage Harness etc..)

              SERVICE MANUAL

This document has been published to be used for after sales service only.

The contents are subject to change without notice.

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. CIRCUIT DIAGRAMS
Parts Guide

MODEL

Service_R-231NW.indd   1

6/24/09   3:56:39 PM

Summary of Contents for R-231NW

Page 1: ...N R 231NW In the interests of user safety the oven should be restored to its original condition and only parts identical to those speci ed should be used WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current contact with following parts may result in a se vere possibly fatal electrical shock High Voltage Capaci tor High Voltage Power Tran...

Page 2: ...ISE FILTER TEST 8 4 12 J TOUCH CONTROL PANEL ASSEMBLY TEST 8 4 CONTENTS 13 K KEY UNIT TEST 8 5 14 L RELAY TEST 8 6 15 M DEFROST TEST 8 6 16 N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 8 6 CHAPTER 9 TOUCH CONTROL UNIT ASSEMBLY 1 OUTLINE OF TOUCH CONTROL UNIT 9 1 2 DESCRIPTION OF LSI 9 1 3 SERVICING FOR TOUCH CONTROL PANEL 9 3 CHAPTER 10 PRECAUTIONS FOR USING LEAD FREE SOLDER 1 Employing lead fr...

Page 3: ...n 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 an operative ...

Page 4: ...t open 3 Discharge high 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 Discha...

Page 5: ...ity 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 meas ured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Clos...

Page 6: ... 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 following...

Page 7: ...rol System Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of FULL Power P 80 approx 80 of FULL Power P 70 approx 70 of FULL Power P 60 approx 60 of FULL Power P 50 approx 50 of FULL Power P 40 approx 30 of FULL Power P 30 approx 40 of FULL Power P 20 approx 20 of FULL Power P 10 approx 1...

Page 8: ...of the customer to contact a qualified electrician and have it replaced with a properly grounded threepronged wall receptacle 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 A...

Page 9: ...nabled when the door is opened and closed or the STOP CLEAR pad is pressed 6 Pan COCCION RECALENTAR 1 Caserola 2 Sopa 3 Pizza 4 Bebida 5 Plato Principal Derretir Suavizar Calentar Function Rapida Cronometro Reloj Nivel de Potencia Comienzo Detencion Cancelacion 1 Papa Asada 2 Verdura Fresca 3 Verdura Congelada 4 Entradas Congeladas Minuto Extra Descongelacion Palomitas de Maiz 5 2 ...

Page 10: ...ling fan motor and the high voltage components are de energized and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch is electrically monitoring the operation of the secondary interlock switch and primary interlock relay RY2 and is mechanically associated with the door so that it will function in the following sequence a When the...

Page 11: ... I O N R O T I C A P A C S S O R C E N I L V 0 5 2 C A F µ 2 2 0 S S A P Y B E N I L R O T I C A P A C V 0 5 2 C A F µ 3 3 0 0 0 S S A P Y B E N I L R O T I C A P A C V 0 5 2 C A F µ 3 3 0 0 0 L N R E T L I F E S I O N or NOTE indicates components with potentials above 250V POWER TRANSFORMER RECTIFIER MAGNETRON CAPACITOR 0 82µF AC2100V or AC1900V OVEN LAMP TURN TABLE MOTOR FAN MOTOR MONITOR SWITCH...

Page 12: ...LOCK RELAY RY2 SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY Figure D 1 Door Open Mechanism Latch Heads Door Switch Lever Latch Hook Monitor Switch Door Sensing Switch Secondary Interlock Switch 4 TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of th...

Page 13: ...K J L CK CK CK K N M I POSSIBLE CASE AND DEFECTIVE PARTS D R O C R E W O P N I T R O H S G N I R I W D E N E P O R O T R O H S N O R T E N G A M R E M R O F S N A R T R E W O P Y L B M E S S A R E I F I T C E R V H R O T I C A P A C E G A T L O V H G I H N E V O E S U F E R U T A R E P M E T N E V O T U O T U C L A M R E H T r o M E T S Y S K C O L R E T N I Y R A M I R P T I W S K C O L R E T N I...

Page 14: ...r temperature The normal result should be 20 to 38 F 11 1 to 21 1 C rise in temperature If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output low rise in water temperature which would extend cooking time or high power output high rise in water temperature which would reduce cooking time Be...

Page 15: ...all the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions CAUTION IF THE THERMAL CUT OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE REPLACE IT 6 Procedure E TEMPERATURE FUSE OVEN 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 co...

Page 16: ...oved 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 9 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 make sure that the secondar...

Page 17: ... the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions MEASURING POINT INDICATION OF OHMMETER Between N and L Open circuit Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit 12 Procedure J TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductor...

Page 18: ...ly 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 testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions 13 Procedu...

Page 19: ...ord and then remove outer case 10 Open the door and block it open 11 Discharge high voltage capacitor 12 Reconnect all leads removed from components during testing 13 Re install the outer case cabinet 14 Reconnect the power supply cord after the outer case is installed 15 Run the oven and check all functions 15 Procedure M DEFROST TEST 1 Place one cup of water in the center of the turntable tray i...

Page 20: ... 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 the troubleshooting guide given below for repair a d b c STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Pin No 1 of the 3 pin connector A and the normal op...

Page 21: ...cuit generates a signal which resets the LSI to the ini tial state when power is supplied 2 Indicator Circuit This circuit consists of 4 digits 12 segments and 3 common electrodes using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltage necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic st...

Page 22: ... and the 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 poss...

Page 23: ...t is used and that the iron temperature is 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...

Page 24: ...mbly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are not intact 3 If the door is not closed 4 If the outer case cabinet is not fitted 1 WARNING WARNING FOR WIRING WARNING Avoid possible exposure to microwave energy Please follow the instructions below before operating the oven To prevent an electric shock take t...

Page 25: ... bottom plate 8 Remove one 1 screw holding ground side terminal of high voltage rectifier assembly and remove capacitor holder 9 Disconnect the terminal of high voltage rectifier assembly from high voltage capacitor 10 Now the H V rectifier assembly and H V capacitor should be free CAUTION WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY ENSURE THAT THE CATHODE GROUND CONNECTION IS SECURELY FIXED TO...

Page 26: ...t the ribbon cable of the membrane switch into the slit of the control panel frame 4 Adjust the upper edge and right edge of the membrane switch to the small depression on the surface of the control panel frame 5 Attach the membrane switch to the control panel frame by rubbing with a soft cloth not to scratch 11 3 6 Tear the backing paper from the new graphic sheet 7 Adjust the upper edge and left...

Page 27: ... 8 Now the turntable motor is free 2 REINSTALL 1 Re install the TTM packing 2 Re install the turntable motor with the TTM packing with the single 1 screw to the oven cavity bottom plate 3 Re connect the wire leads to the turntable motor 4 Insert the tab of the turntable motor cover into the hole of the bottom plate 5 Re install the turntable motor cover to the bottom plate with one 1 screw 11 COOL...

Page 28: ...to the oven cavity 6 Reconnect wire leads to the control unity referring to the pictorial diagram 7 Make sure that the monitor switch is operating properly and check continuity of the monitor circuit Refer to chapter Test Procedure and Adjustment procedure 13 DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1 Adjustment 1 Disconnect the power supply cord and then remove...

Page 29: ...frame with releasing latch spring from door frame and latch head 14 Now latch head and latch spring are free 15 Remove door screen from door frame 16 Now door screen is free 14 DOOR REPLACEMENT 2 REINSTALL 1 Re install door screen to door frame 2 Re install latch spring to the head Re install latch spring to the door frame Re install latch head to the door frame 3 Re install door panel to door fra...

Page 30: ... Tear the backing film by pulling the adhesive tape 3 Put the pasted side of the sealer film on the door panel Figure C 7 Door Replacement Upper Oven Hinge Lower Oven Hinge Pin Upper Oven Hinge Slit choke of door panel Choke Cover Pin Lower Oven Hinge Figure C 8 Sealer film Sealer film Backing film Adhesive tape ...

Page 31: ...L B D E R A N C 2 Y R G 1 3 B N C 2 1 N R G Y R G M O C O N Y R G Y R G E G A T L O V H G I H R O T I C A P A C R E I F I T C E R V H D E R T H W RED S T N E N O P M O C E G A T L O V H G I H N O R T E N G A M E L B A T N R U T R O T O M R E W O P R E M R O F S N A R T D E R D E R Y R G Y R G D E R T H W T H W G R O E S U F R O T O M N A F U L B Y R G D E R P M A L N E V O D E R Y R G Y R G L N WH...

Page 32: ...R 231NW 12 2 2 Control Panel Circuit Figure S 2 Figure S 2 Control Panel Circuit ...

Page 33: ...R 231NW 12 3 3 Printed Wiring Board Figure S 3 Figure S 3 Printed Wiring Board ...

Page 34: ...ESCRIPTION 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS Parts marked may cause undue microwave exposure Parts marked S are used in voltage more than 250V INDEX SPAKCE807WREZ 6 1 TURNTABLE TRAY 6 5 INSTRUCTION BOOK 6 2 TURNTABLE SUPPORT INTO THE OVEN CAVITY Not replaceable items TRAY PAD ASSY CPADBA287WRKZ PACKING CASE MICROWAVE OVEN TOP PAD ASSEMBLY FPADBA585WRKZ POLYETHYLENE BAG SSAKHA014WRE0 PLAS...

Page 35: ...7 1 2 2 4 1 4 10 4 2 7 8 7 8 7 8 7 8 7 7 4 3 6 1 6 2 7 8 7 6 7 11 4 9 1 7 7 1 4 5 4 11 4 8 7 11 1 13 7 3 6 4 7 6 4 4 4 14 4 12 4 15 4 7 7 7 7 10 7 1 1 5 1 1 4 13 4 17 1 2 7 3 7 4 7 6 7 2 7 1 1 1 1 9 1 4 2 3 2 3 1 11 7 1 4 6 1 10 1 12 7 8 4 16 1 OVEN PARTS ...

Page 36: ... R 1 1 1 F B 1 e l b a e g n a h c r e t n I r e m r o f s n a r t e g a t l o v h g i H Z Z R W 8 2 7 A N R T R 1 1 1 W A 1 r e d l o h e s u F Z K R W 4 1 4 A F B W P F 2 1 1 F A 1 A 3 6 T e s u F 0 E R W 7 0 0 A B S F Q 3 1 1 CABINET PARTS E B 1 t e n i b a c e s a c r e t u O Z P R W 8 5 9 A U B A C G 1 2 S A 1 e t a l p m o t t o B Z W R W 7 7 3 A I A D G 2 2 F A 2 t o o F Z E R W 4 0 1 A P G...

Page 37: ...R 231NW 4 2 DOOR AND CONTROL PANEL PARTS 5 2 6 6 5 5 5 4 5 3 5 6 5 7 5 1 6 5 3 2 3 1 1 3 1 3 6 3 5 3 4 3 8 3 7 3 3 3 1 2 ...

Page 38: ...RKZ Control unit 1 BH 3 5 QCNC A023WRZZ Rubber connector 1 AE 3 6 RLCDSA105DRZZ Liquid crystal display 1 AQ 3 7 XEPS730P08XS0 Screw 3mm x 8mm 2 AB 3 8 PCUSUA633WREZ Cushion 1 AE DOOR PARTS 5 1 FDORFA397WRTZ Door panel assembly 1 BB 5 2 GWAKPB262WRRZ Door frame 1 AW 5 3 HPNL A926WRRZ Door screen 1 AS 5 4 LSTPPA205WRFZ Latch head 1 AF 5 5 MSPRTA187WRE0 Spring 1 AC 5 6 PSHEPA782WREZ Sealer film 1 AG ...

Page 39: ... r e b b u R Z Z R W 3 2 0 A C N C Q 5 3 Q A 1 y a l p s i d l a t s y r c d i u q i L Z Z R D 5 0 1 A S D C L R 6 3 B A 2 m m 8 x m m 3 w e r c S 0 S X 8 0 P 0 3 7 S P E X 7 3 E A 1 n o i h s u C Z E R W 3 3 6 A U S U C P 8 3 DOOR PARTS B B 1 y l b m e s s a l e n a p r o o D Z T R W 7 9 3 A F R O D F 1 5 W A 1 e m a r f r o o D Z R R W 2 6 2 B P K A W G 2 5 S A 1 n e e r c s r o o D Z R R W 6 2 ...

Page 40: ... e b b u R Z Z R W 3 2 0 A C N C Q 5 3 Q A 1 y a l p s i d l a t s y r c d i u q i L Z Z R D 5 0 1 A S D C L R 6 3 B A 2 m m 8 x m m 3 w e r c S 0 S X 8 0 P 0 3 7 S P E X 7 3 E A 1 n o i h s u C Z E R W 3 3 6 A U S U C P 8 3 DOOR PARTS B B 1 y l b m e s s a l e n a p r o o D Z T R W 7 9 3 A F R O D F 1 5 W A 1 e m a r f r o o D Z R R W 2 6 2 B P K A W G 2 5 S A 1 n e e r c s r o o D Z R R W 6 2 9 ...

Page 41: ... 1 AL PPACGA176WREZ 1 4 10 AC PSHEPA782WREZ 2 5 6 AG PSHEPB087WREZ 2 3 1 1 AT PSHEPB089WREZ 2 3 1 1 AT PARTS CODE No PRICE RANK NEW MARK PART RANK Q QCNC A014WRZZ 2 3 5 AE QFS TA014WRE0 1 1 10 AG QSW KA053DRZZ 2 3 1 2 AQ QSW MA085WRE0 1 1 1 AF QSW MA137WRE0 1 1 1 AH QSW MA147WRZZ 1 1 1 AG R RC PZA041WRE0 1 1 5 AS RC QZA307WRZZ 1 1 5 AX RC QZA327WRZZ 1 1 5 AT RC QZA328WRZZ 1 1 5 AS RLCDSA105DRZZ 2 ...

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