Sharp R-4H55 Service Manual

Microwave oven

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WH5.5

R-4X55

ls4x55a

SHARP

SERVICE MANUAL

S9312R4X55PJZ

MICROWAVE OVEN

R-4H55

MODELS

Rm4H55

R-4X55

Rm4X55B

In interests of user-safety the oven should be restored to its original condi-

tion and only parts identical to those specified should be used.

TABLE OF CONTENTS

GENERAL IMPORTANT INFORMATION

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

WARNING ......................................................................................................................................................

RODUCT SPECIFICATIONS .........................................................................................................................

APPEARANCE VIEW ....................................................................................................................................

OPERATING SEQUENCE .............................................................................................................................

FUNCTION OF IMPORTANT COMPONENTS' ............................................................................................

TRABLESHOOTING CHART .........................................................................................................................

TEST PROCEDURE ....................................................................................................................................

TOUCH CONTROL PANEL

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

.20

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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.27

MICROWAVE MEASUREMENT .................................................................................................................

.30

WIRING DIAGRAM

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PICTORIAL DIAGRAM

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

.36

CONTROL PANEL CIRCUIT

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.38

PRINTED WIRING BOAD ............................................................................................................................

PARTS LIST ............ . ...................................................................................................................................

SHARP CORPORATION

Table of Contents

Summary of Contents for Sharp R-4H55

Page 1: Table Of Contents
MICROWAVE OVEN MODELS Rm4H55 R-4X55 Rm4X55B In interests of user-safety the oven should be restored to its original condi- R-4H55 tion and only parts identical to those specified should be used. TABLE OF CONTENTS GENERAL IMPORTANT INFORMATION ...................... WARNING ..............................
Page 2 -‘--------*L~-~.--- _-__. -. ,.‘&j:*prl, ;“’ -11w”As. .i.- .,,m- d..’ R-4X55B R-4X55...
Page 3: General Important Information
:;:g#j& R-4H55 /R-4X55/ Fb4X55B GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the en- tire text of this manual, so that they will be qualified to render sat- isfactory customer service.
Page 4: Roduct Specifications
LOW ..............approx. 10% of Full Power DEFROST SENSOR (R-4X55/4X55B) WEIGHT ADJUST (R-4X55/4X55B) EASY DEFROST (R-4H55) SENSOR INSTANT ACTION SENSOR COOK, REHEAT SENSOR...
Page 5: Appearance View
TOUCH CONTROL PANEL SMART & EASY gc{jgqig R-4H55 h. EASY DEFROST PAD (R-4H55) a. SENSOR COOK PAD Press to defrost meat by entering weight. Press to select several popular menus. MORE( A ), LESS( v ) PADS REHEAT SENSOR PAD Press to select 3 popular Reheat menus.
Page 6: Operating Sequence
R-IX55 R-4X558 OPERATION SEQUENCE The circuits to the power transformer, fan motor and OFF CONDITION turntable motor are cut off when the upper latch switch, Closing the door activates all door interlock switches lower latch switch and stop switch are made open. The (Upper latch switch, Lower latch switch and Stop switch) oven lamp remains on even if the oven door is opened IMPORTANT...
Page 7 SENSOR COOKING CONDITION Cooking Sequence. Using the SENSOR COOK, REHEAT SENSOR or SEN- 1. Touch each SENSOR COOK function pad to operating SOR INSTANT ACTION function, the foods are cooked or the sensor cooking. defrosted without figuring time, power level or quantity. NOTE:The oven should not be onerated on SENSOR When the oven senses enough steam from the food, it re- COOK, REHEAT SENSOR or SENSOR INSTANT...
Page 8: Function Of Important Components
R4H55 R-4X55 R-4X55B FUNCTION OF IMPORTANT COMPONENTS fuse (M8A) when the high voltage rectifier is shorted. DOOR OPEN MECHANISM The door can be opened by pushing the door open button an the control panel. When the door open button is pushed, the latch lever is moved upward, operating the latch head.
Page 9 If the water remains cold carry out 3D checks and re-exam- Sharp recommend that wherever possible fault-finding ine the connections to the component being tested. is carried out with the supply disconnected. It may in,...
Page 10 TEST PROCEDURE ABCDEEEEFGHHII POSSIBLE CASE AND DEFECTIVE PROBLEM :ONDITION Home fuse blows when power supply cord is plugged into wall outlet. FUSE M8A blows when power supply .cord is plugged into wall outlet. “88:88” does not appear in display but power supply cord is plugged into wall outlet.
Page 11 . .-- R-4X55 R-4X55B I I RE 2 i: I I I...
Page 12 RdH55 RdX55 RdX55B TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal.
Page 13 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4. Operate the microwave oven at HIGH for the temperature of the water rises by a value T of (10 -t 2)“C. 5. Stir the water to equalize temperature throughout the vessel. 6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C) 7.
Page 14 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring the water with thermometer and note them.
Page 15 R-4H55 R-4X55 R-4X55B TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Connect the ohmmeter across the terminal B+C 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 mor than 100 kR in the other direction.
Page 16 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER TEST (New Zealand Model) CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, Check between the terminals as de- scribed in the following table. L (min) CxtiO% CyX?O%...
Page 17: Pictorial Diagram
TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST MOTOR WINDING TEST CARRY OUT aCHECKS Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below. Table: Resistance of Motor Motors Resistance Fan motor Approximately 246 R Turntable motor...
Page 18: Test Procedure
R-4X55 R-4X55E TEST PROCEDURES PROCEDURE COMPONENT TEST LElTER 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 cannot be performed with only a voltmeter and ohmmeter.
Page 19 R-4H55 R-4X.55 R-4XS5B TEST PROCEDURES PROCEDURE LElTER COMPONENT TEST Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking. DC. voltage indicated ..Defective relay. DC. voltage not indicated..Check diode which is connected to the relay coil. If diode is good, control unit is defective.
Page 20 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.
Page 21 R-4H5.5 R-4X55 R-4X.558 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6-l. Touch SENSOR COOK pad and number 1 pad and 0 pad. 6-2. The control panel is in the sensor cooking operation. 6-3. After approximately 20 seconds, push plunger of select switch.This condition is same as ludgement by AH sensor.
Page 22: Touch Control Panel
iwH55 R-4X5.5 R-4X558 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Synchronizing Signal Circuit The touch control section consists of the following units The power source synchronizing signal is available in as shown in the touch control panel circuit. order to compose a basic standard time in the clock circuit.
Page 23 DESCRIPTION OF LSI LSI(IZA506DR) The I/O signals of the LSI(IZA506DR) are detailed in the following table. Description Signal Pin No. Power source voltaae: -5.2V VC voltage of power source circuit input. Reference voltaae inout terminal. VASS A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintained at -5V.
Page 24 Description Pin No. Signal Used for initial balancing of the bridge circuit (WEIGHT SENSOR).(R4X55,R4X556) C5-C6 22-23 Oven lame drivina sianal. (Sauare Waveform : 50Hz) zonlsec To turn on and off the shut-off relay(RY1). The square waveform voltage is delivered -ll-u-u-l -ll-uu-T to the relay (RYl) driving circuit and relay O”“ng...
Page 25 Description Signal Pin No. Seament data sianal. Signal similar to 82. Kev strobe sianal. Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-2 line keys on key matrix is touched. Seament data sianal.
Page 26 R4H5.5 R-4X5.5 R-4X5.W ABSOLUTE HUMIDITY SENSOR CIRCUIT the bridge circuit is deviated to increase the voltage (1)Structure of Absolute Humidity Sensor available at IN1 terminal of the LSI. The absolute humidity sensor includes two thermis- Then the LSI observes that voltage at IN1 terminal and tors as shown in the illustration.
Page 27 -!!!- R-4X55 R-lX55B WEIGHTSENSOR CIRCUIT (R-4X55, R-4XX55B) Turntable Turntable Motor Section View of Turntable Weight Sensor support Construction of W eight Sensor Weight 6B”SW Weight sensor circuit This circuit works to weight the food by weight sensor during SENSOR DEFROST modes to set heating time. Piezo- electric device is used in theweight detector section.
Page 28 SERVICING that the two can’t be separated. For those models, 1 .Precautions for Handling Electronic Components check and repair all the controls (sensor-related ones This unit uses CMOS LSI in the integral part of the included) of the touch control panel while keeping it circuits.
Page 29 R-4H55 R-4X55 R-4X55B COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC- TIONS BELOW .BRBEFORE OPERATING THE OVEN. 2. Door hinge, support or latch hook is damaged. 1. CARRY OUT 3D CHECKS. 2. Make sure that a definite “click” can be heard when the 3.
Page 30 R-4X55 R-4X55B REMOVAL MAGNETRON 6. Remove the magnetron from the waveguide with care CARRY OUT 3D CHECKS so the magnetron antenna should not hit by any metal Disconnect the H.V. wire A and filament lead(longer object around the antenna one) of the transformer from the magnetron. 7.
Page 31 R-4X5.5 R4X55B 3) Now, the fan blade will be free. 3) Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen ham- CAUTION: mer or rubber mallet. Do not use this removed fan blade again.Because CAUTION: the hole(for shaft) of it may become bigger than a Do not hit the fan blade strongly when installed...
Page 32 R-4X55 FMX5SB POWER SUPPLY CORD REPLACEMENT (FOR AUSTRALIA MODEL) Removal Blue wire lead of power supply cord 1. CARRY OUT 3D CHECKS. 2. Disconnect the brown wire of the power supply cord from the fuse holder. 3. Remove the connector CE-230 by cutting the con- nected wire leads to it.
Page 33 R-4H5.5 R-4X55 R-PX55B UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT If the lower latch switch, stop switch, upper latch switch 3. The monitor switch contacts close when the door is and monitor switch do not operate properly due to a mis- opened.
Page 34 LATCH HEAD RE-INSTALL CHOKE COVER REMOVAL 1. Pick up the latch spring and catch the one ring of the an iron plate(thickness of about OSmm) or flat Insert latch spring on the tab of the door panel as shown in type screw driver to the gap between the choke cover Figure C-i 0.
Page 35: Microwave Measurement
MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch NARDA 8100 and doorare completed individually or collectively, the fol- NARDA 8200 lowing leakage test must be performed with a survey in- HOLADAY HI 1500 strument and it must be confirmed that the result meets the SIMPSON 380M requirements of the performance standard for microwave 2.
Page 36 NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND R- 4X55B ’ F I’ 1 i Ij :Cni zh-i 6’ -- -’ iu’ 121 ( ODL- --; 5; I.-TTN c% --1 /--\ ;lWI ._A E ii Figure O-l(a). Oven Schematic-OFF Condition (For Australlia model) NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND R- 4X55B Figure 0-2(a).
Page 37 Figure O-l(b). Oven Schematic-OFF Condition (For New Zealand model) &$j ’ b-b-3 Figure 0-2(b). Oven Schematic-ON Condition (For New Zealand model)
Page 38 cii3 I-.-...
Page 39 R-4H55 R-4X55 A-4X558 :: ? :g’D...
Page 40 R-4X55 R-lX55.B 9’ m/lit 53 iW1SID’O ,3 : ‘< ---I z;r= ASZ/“I. (3 Z” I XI Zd ZYii ISE,~OOPI +---I hOP,dI’O -J=i , - - - _ _ _ _, [I:!; $7 i...
Page 41 R-4H55 R-4X65 R-4X558 4” I I?1 HH~!‘lIr B a P >o- y--J i-p-J--l Y” >^ -...
Page 42 Figure S-5. Printed Wiring Board...
Page 43: Parts List
Weight sensor assembly [R-4X55, R-4X55Bl 1-21 FDTCTAl39WRKO CABINET PARTS Lower oven hinge 2- 1 FHNG-A172WRTO GCABUA415WRPO Outer case cabinet [R-4H55, R-4X551 2- 2 Outer case cabinet [R-4X55Bl 2- 2 GCABUA429WRPO Upper oven hinge 2- 3 MHNG-A28OWRTO Turntable motor cover 2- 4...
Page 44: Wh55
Zener diode (HZ16-1) [R-4H55] RH-EZA105DREO Zener diode (RD4.3ESB2) 3- 2 FPNLCB023WRKO Control Panel frame with key unit[R-4X55] 3- 2 FPNLCB024WRKO Control Panel frame with key unit[R-4H55] lE?C 3- 2 FPNLCB037WRKO Control oanel frame with key unit[R-4X55B] 3- 3 JBTN-A817WRFO Gpen button[R-4H55,R-4X55]...
Page 45 Fan blade 4-31 PDUC-A468WRFO Fan duct Weight sensor support [R-4X55,R-4X55B] LANG-AO4lWRPO 4-32 4-33 PCUSUA369WRPO Cushion [R-4X55,R-4X55B] DOOR PARTS Door assembly, complete.[R-4H55,R-4X55] CDORFA589WRKO Door assembly, complete.[R-4X55Bl CCORFA596WRKO 5- 1 FCORFA226WRTO Door panel [R-4H55,R-4X55] 5- 1 FCORFA229WRTO Door panel [R-4X55B] 5- 2...
Page 46 Screw; M4 x 8 zinc plated steel (Australian Model) XFPSD40P08KOO Screw; M4 x 8 zinc plated steel(New Zealand Model) 7-11 XFPSD4OP08000 Screw; M4 x 8 zinc plated steel [R-4H55] 7-11 XFPSD40P08000 Screw; M4 x 8 zinc plated steel [R-4X55,R-4X55B] 7-12 XHTSD4OP08RVO Screw;...
Page 47 R-4HSS R-4X55 R-4X55B OVEN AND CABINET PARTS...
Page 48 A-4H55 R-4X55 w4X55B CONTROL PANEL PARTS /’ /’ DOOR PARTS z’ c’ /’ I’ ,’ /’ /’ /’ .’ .’ _*’ Actual wire harness may be different than illustration. ‘93 SHARP CORP. (09KO 75E) Printed Australia...

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R-4x55 R-4x55b

Sharp R-4H55 Service Manual

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Summary of Contents for Sharp R-4H55

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