Service manual

ManualsBrandsSharp ManualsDomestic AppliancesR-430EK

SUPPLEMENTAL

SHARF?

SERVICE MANUAL

R-430BK

R-430BW

R-430BD

S38Mi 07R430BE

MICROWAVE OVEN MODELS

R-430BK/R-430BW / R-430BD

In the interest of user-safety the oven is to be restored

to its original condition and only the parts identical to

those specified should be used.

R-430BW

WARNING TO SERVICE PERSONNEL: Microwave

ovens contain circuitry capable of producing

very high voltage and current. Contact with the

following parts may result in a severe, possibly

fatal electrical shock.(High Voltage Capacitor,

High Voltage Power Transformer, Magnetron,

High Voltage Rectifier Assembly, High Voltage

Harness etc..)

This is a supplemental Service Manual for Microwave Oven models R-430BK, R-430BW & R-430BD

These models are quite similar to the Base Model R-420BK (S/M#S28M104R420BE ).

This supplemental manual must be used in conjunction with the base model service manual for complete operation, service,

safety and replacement parts information.

TABLE OF CONTENTS

SECTION

PAGE

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY.

........... Inside Front Cover

Before Servicing

.............................................................

Inside Front Cover

Warning to Service Personnel

................................................................. 1

Forewordandwarning ....................................................................... 2

Specifications ...............................................................................

KeyUnitLayout .............................................................................

Operation ..................................................................................

Servicing and Troubleshooting Guide .......................................................... 6

TestProcedures .............................................................................

TouchControlOutline .......................................................................

Component Replacement and Adjustment Procedure

...........................................

Microwave Measurement Procedure

.......................................................... 22

Schematic / Wiring Diagram ................................................................. 23

Parts .....................................................................................

Packing and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

SHARP ELECTRONICS CORPORATION

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

Summary of content (36 pages)

PAGE 1
SUPPLEMENTAL SHARF? R-430BK R-430BW R-430BD SERVICE MANUAL S38Mi 07R430BE MICROWAVE OVEN MODELS R-430BK/R-430BW / R-430BD In the interest of user-safety the oven is to be restored to its original condition and only the parts identical to those specified should be used. R-430BW WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in a severe, possibly fatal electrical shock.
PAGE 2
R-430BK R-430BW R-430BD (a 1 Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
PAGE 3
SERVICE MANUAL SHARI? Microwave Ovens R=430BK/R=430BW/R=43OBD Foreword This manual has been prepared to provide Sharp Electronics Corporation personnel with complete operation and service information for Sharp microwave oven models R-430BWR=430BW/R=430BD. Specifications General Information It is recommended that service personnel carefully study the entire text of this manual so they will be qualified to render satisfactory customer service. . Check interlock switches and the door seal carefully.
PAGE 4
R-430BK R-430BW R-430BD WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts may result in a severe, possibly fatal, electrical shock. (EXAMPLE) High Voltage Capacitor, Transformer, Magnetron, Assembly, High Voltage Read the Service Manual instructions. High Voltage Power High Voltage Rectifier Harness etc.. carefully and follow all Danger High Voltage Before Servicing 1.
PAGE 5
R-430BK R-430BW R-430BD SPECIFICATIONS Item Description Power Requirements 120 Volts 14 Amperes 1650 Watts 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 Test Procedure) Operating frequency of 2450 MHz Case Dimensions Width 21 ll&” Height 1231;’ (including feet) Depth 1731~” Cooking Cavity 1.3 Cu.Ft. Width 15” Height 817/& Depth 1631;’ Tray Size 141/i’ Diameter Control Complement Touch Control System Clock (I:00 - 12:59) Timer (0 - 99 min. 99 sec.
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R-430BK R-430BW R-430BD Key Unit Layout a. Indicators. b. Lighted digital display. c. Custom Help. Features user friendly communications cooking procedure. during d. SENSOR COOKING pads. Cooking time is determined by AH Sensor e. Minute Plus pad. Touch to start oven or Touch to cook for 1 minute at 100% power or to increase cooking time. f. Compu Cook pad. Touch to cook certain foods. -0 g, Compu Defrost pad. Touch to defrost certain foods. -0 a b h. Number selection pads. i. Power Level pad.
PAGE 7
OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description during oven ope ration. of compon ent functions Sensor Cooking Condition . When using the REHEAT function, the foods are cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and the power level needed for 1best results. When the food is cooked, water vapor is developed.
PAGE 8
R-430BK R-430BW R-430BD When troubleshooting the microwave oven, it is helpful to follow the sequence of operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure” section. Before replacing a blown monitor fuse, test the door sensing switch, primary interlock relay, secondary interlock switch and monitor switch for proper operation.
PAGE 9
R-430BK R-430BW R-430BD Procedure Letter G. Component Test Touch Control Panel Assembly Test The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance can not be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two control units, Control Unit and Key Unit.
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R-430BK R-430BW R-430BD TEST PROCEDURES Component Test Procedure Letter G. Touch Control Panel Assembly Test (Confinued) When testing is completed, 1. Disconnect the power supply cord, and then remove outer case cabinet. 2. Open the door and block it open. 3. Discharge the high voltage capacitor. 4. Reconnect all leads removed from components during testing. 5. Re-install the outercase cabinet. 6. Reconnect the power supply cord after installing the outer case cabinet. 7.
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R-430BK EEY TEST PROCEDURES .’ Procedure Letter 1. Component Test Continued Procedures to be taken when the foil pattern of the printed wiring board (PWB) is open 5. Make a visual inspection of the varistor burn damage and test the transformer with an ohmmeter for the presence of layer short-circuit (check the primary coil resistance which is approximately 210 Q * 15%). If any abnormal condition is detected, replace the defective part(s) m m 0 6.
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R-430BK R-430BW R-430BD TEST PROCEDURES Procedure Letter J Component Test Compu Defrost Test 1. Place one cup of water in the center of the turntable tray in the oven cavity. 2. Close the door, touch the “COMPU DEFROST” pad once and touch the number pad “I”, and touch the number pad “5”. Then touch the “START” pad. 3. The oven is in “COMPU DEFROST’ cooking mode. 4. The oven will operate as follows: 1st Stage Weight 0.
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R-430BK EEY Procedure Letter L. Component Test AH Sensor Test Checking the initial sensor cooking condition 1. The oven should be plugged in at least five minutes before sensor cooking. 2. Room temperature should not exceed 95” F (35” C). 3. The unit should not be installed in any areas where heat and steam are generated. The unit should not be installed, for example, next to a conventional surface unit. 4.
PAGE 14
R-430BK R-430BW R-430BD Component Test Procedure Letter L. Checking the Control Unit (Confinued) 6. Disconnect the wire leads to the primary of power transformer. 7. Ensure that these leads remain isolated from other components and oven chassis by using insulated tape. 8. After that procedure, reconnect the power supply cord. 9. Check the sensor cook operation proceed as follows: A. Touch REHEAT pad once and touch Start pad. B. The control panel is in the sensor cooking operation. C.
PAGE 15
R-430BK E%dl OUTLINE OF TOUCH CONTROL PANEL emit Audible sounds (key touch sound and completion sound). The touch control section consists of the following units as shown in the touch control panel circuit: (1) Key Unit (2) Control Unit (The Control Unit consist of Power Unit and LSI Unit) 4. Door Sensing Switch A switch to “tell” the LSI if the door is open or closed. 5. Relay Circuit To drive the magnetron, fan motor, turntable motor and oven lamp. Key Unit 6.
PAGE 16
R-430BK R-430BW R-430BD The I/O signals of the LSI (IZA866DR) is detailed in the following table. ( Pin No. 1 Signal I/O 1Description 1 AN8 IN Signal coming from touch-key. When either G-12 line on key matrix is touched, a corresponding signal out of P20-P27 will be input into AN8. When no key is touched, the signal is held at “H” level. 2 AN9 IN Signal similar to AN8. When either Gil line on key matrix is touched, a corresponding signal will be inputted into AN9.
PAGE 17
R-430BK R-430BW R-430BD Pin No. Signal I/O 22 P30 OUT Description Signal to sound Buzzer (2.0 kHz). 0.1 sec. B: completion sound 23 P31 OUT Terminal not used. 24 P32 OUT Common data signal: COM5. Connected to LCD signal COM5 (Pin No. 37). 25-29 P33-P37 OUT Segment data signal. Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) P33 (25) ............ P34 (26) ............ P35 (27) ............ P36 (28) ............ P37 (29) ............ SEG 1 (39) ..........
PAGE 18
R-430BK R-430BW R-430BD Pin No. Signal I/O Description 80-84 PIO-PI4 OUT Used for Initial balancing of the bridge circuit (absolute humidity sensor). 85-86 P15-PI6 OUT Terminal not used. 87 PI7 OUT Oven lamp, fan motor and turntable motor driving signal. To turn on and off shut off relay RYI. The square waveform voltage is delivered to the RY-1 driving circuit and RY-2 control circuit. 16.7 msec.
PAGE 19
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. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed: CMOS LSI have extremely high impedance at its input and output terminals.
PAGE 20
R-430BK R-430BW R-430BD COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE icrowave ovens contain circuitry capable of producing very high voltage and current, contact with the following arts may result in severe, possibly fatal, electric shock. (ample gh Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness c.. Avoid possible exposure to microwave energy. instructions below before operating the oven. Please follow the 5.
PAGE 21
R-430BK E%F ABSOLUTE HUMIDITY SENSOR CIRCUIT the sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds later the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with RI 07-RI 11 of IC2.
PAGE 22
R-430BK R-430BW R-430BD AH SENSOR DUCT REMOVAL 7. Slide the two tabs of the sensor duct to the right. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3 . Remove screws from the rear of the outercase cabinet. Slide the entire case back about 1 inch (3cm) to free it from retaining clips on the cavity faceplate. 8. Sensor duct is now free. . Discharge the high voltage capacitor before touching any oven components or wiring. 4. Discharge the high voltage capacitor. 5.
PAGE 23
R-430BK R-430BW R-430BD AH SENSOR ORIENTATION 8t HARNESS ROUTING AH Sensor Orientation Mounting Screw AH densor AH Sensor Duct Figure l-1 6 Oven Left Side View AH Sensor Harness % C Figure 2-16 Oven Top View 21
PAGE 24
R-430BK R-430BW R-430BD MICROWAVE MEASUREMENT PROCEDURE 2. Place the oven tray in the oven cavity. After adjustment of the door, interlock and monitor switches are completed individually or collectively, a INTERLOCK SWITCH TEST and MICROWAVE LEAKAGE TEST must be performed to assure compliance with DHHS (CDRH) Performance Standards for Microwave Ovens. 3. Place the load of 275 & 15ml(9.8 oz.) of tap water initially at 20 + 5’C (68OF) in the center of the oven cavity.
PAGE 25
J, WHT CAVITY TEMP. FUSE 0 - WHT I I-- r I 1 I ha n__- _f 1 or secondary circuits. Ry_1 I c) n 6. Terminal with blue mark on lamp socket must be connected to the (orange) wire. 5. The hot (red) wire must be connected to the (finish lead) terminal of the power transformer. screw must be kept tight at all times. - __ In ORG I .. c- - 7 I B1 DOOR SENSING SWITCH N.O. lf GRN 1 PRItiiki _ u m u Schematic Diagram - \-‘- - - -I %+_2+- 3.
PAGE 26
R-430BK R-430BW R-430BD -I - - - CE ’ , I I I I I I I I I I I I I I I I I I I I I I I I I I I I 24 92 00’ -0 I A
PAGE 27
6 5 4 3 2 1 , I ICI01 w R4 27 ~ AC1 2OV 60Hz 1 e iA+ 4 T' Dl-D4 lIESI :I D5 4 LED Q2 2SB1238 b/ 1 R5 4.7k D6 VA 0 GND ._d _o .. 7 13 VC 6 I I I b -I INT 5' -I I -- I C TURNTABLE MOTOR OVEN LAMP FAN MOTOR VR ” RYI LN.9 -I b [COW w 1 I e-w-_ 1: I I 0 s-_* 101 SPI = [c5 BUZZER [CSj TURNTABLE MOTOR OVEN LAMP FAN MOTOR R6 3.3k 1 I I I J m’ c5 _ lOpI35v Q3 KRC243M I I MICRO +&7] MICRO D8 lC8l N.C. cz1 Cl1 N.C.
PAGE 28
PAGE 29
R-430BK R-430BW R-430BD 1 2 3 4 5 6 A B C D E F G H Printed Wiring Board of Power Unit ~ 1 2 3 4 27 5 6
PAGE 30
R-430BK R-430BW R-430BD Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; I-800-BE-SHARP Ref No. Part No. Qty Description Q Electrical Code _ * l- 1 RC-QZB018MREO M H.V. Capacitor * l- 2 FH-DZBOO8MRYO M H.V.
PAGE 31
R-430BK R-430BW R-430BD Ref No. Part No. Q Description Qty Code 1 BK Control Panel 3-l / CPWBFBOllMRUO- M Control unit' 3-1A QCNCMA446DREO J &pin connector (CN-A) 1 AD 3-1B QCNCMA275DREO J 2-pin connector (CN-B) 1 AB 3-1c FW-VZB146MREO M Lead wire harness 1 AC 21 RC-KZAO87DREO J Capacitor O.lkF 50V 1 AB 22 VCEAB31EW108M J Capacitor 1000pF 35V 1 AD C3 RC-KZA087DREO J Capacitor O.
PAGE 32
R-430BK R-430BW R-430BD Ref No. Part No.
PAGE 33
r R-430BK R-430BW R-430BD A z 4 I -I 3 1 4 I I I I 5 1 I I 6 Cavity Assembly 3 Q / Q 5-3 : 02-a 9 1-12
PAGE 34
R-430BK R-430BW R-430BD 1 2 3 4 5 6 Control Panel Assembly 4 - 3 - J - 1 Q 4-o - Door Assembly -----------~-___- ------- r---- _L ------------~-- 1 E 4-2 (3 ’ ‘$ 4-1 ‘\ \ I \ F - G - H l--_____-__----------~-_----_--_--___----------_1 J 2 3 4 32 5 6
PAGE 35
Wire Harnesses *Actual * TRAY HOLDER a OPERATlON harnesses may be different than illustrations. 4 MANUAL d> .. .., .: _:^ * PACKING CASE U * Non-replaceable 1 items.
PAGE 36
R-430BK R-430BW R-430BD SHARR ‘980 SHARP CORP. (3M2.70E ) Printed in U.S.A.