Sharp R-9X55 Service Manual

Convection microwave oven

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SHARP

SERVICE MANUAL

S3301 R9X55J//

CONVECTION

MICROWAVE

OVEN

MODEL

R-9X55

In interests of user-safety

the oven should be restored to its original condi-

TABLE OF CONTENTS

page

GENERAL

IMPORTANT

INFORMATION

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

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

RODUCT SPECIFICATIONS

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

APPEARANCE

VIEW ....................................................................................................................................

OPERATING

SEQUENCE

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

FUNCTION

OF IMPORTANT

COMPONENTS'

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

TRABLESHOOTING

CHART.. ....................................................................................................................

.I1

TEST PROCEDURE

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

TOUCH CONTROL

PANEL ........................................................................................................................

.24

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

MICROWAVE

MEASUREMENT

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

WIRING DIAGRAM

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

PICTORIAL

DIAGRAM

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

CONTROL

PANEL CIRCUIT

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

.42

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

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

.44

SHARP CORPORATION

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Page 1: Table Of Contents
SHARP SERVICE MANUAL S3301 R9X55J// CONVECTION MICROWAVE OVEN MODEL R-9X55 In interests of user-safety the oven should be restored to its original condi- TABLE OF CONTENTS page ...................... GENERAL IMPORTANT INFORMATION WARNING ....................................................... RODUCT SPECIFICATIONS APPEARANCE VIEW ............................ OPERATING SEQUENCE ..........................
Page 3: General Important Information
SERVICE MANUAL SHARP MICROWAVE OVEN R-9X55 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
PRODUCT SPECIFICATIONS DESCRIPTION ITEM 240 Volts Power Requirements 50 Hertz Single phase, 3 wire earthed 1600 W (Microwave) Power Consumption 1600 W (Convection) 800 watts nominal of RF microwave energy (2 litre water load) Power Output 900 watts (IEC-705-1988 Operating frequency of 2450MHz Convection...
Page 5: Appearance View
APPEARANCE VIEW 1. Oven lamp 2. Door hinges sensor and Reheat sensor 3. Door sefty latches 10. Access cover for oven 4. See through door lamp replacement Turntable 11. Ventilation openings 5. Touch Control Panel Tarntable stipoort plate ---‘!%Z?,~ 12. Low rack 6.
Page 6: Operating Sequence
OPERATION SEQUENCE OFF CONDIITION The circuits to the power transformer and turntable Closing the door activates all door interlock switches motor are cut off when the right latch switch and left (Right latch switch. Left latch switch and stop switch.) latch switch are made open.
Page 7 R-9X55 CONVECTION COOKING CONDITION The damper is returned to the open position, closing the damper switch contacts which send a signal to the control PREHEATING CONDITION unit, de-energizing shut-off relay (RY4). Program desired convection temperature by touching the CONVECTION pad and the temp. pad. When the...
Page 8 ABSOLUTE HUMIDITY SENSOR (AH SENSOR) COOK- and the timer counts down to zero.At this time, the ING CONDITION door may be opened to stir food, turn it or season, lncase where the AH sensor is used, the foods are cooked in etc.
Page 9 mistor is energized, the voltage across the tempera- ture measurement circuit is measured. And after 21 seconds since the thermistor is cut off, the convec- 64 ‘SW tion motor operates for 10 seconds. The oven carries out the procedure above again. If CONVECTION -’...
Page 10: Function Of Important Components
FUNCTION OF IMPORTANT COMPONENTS ASYMMETRIC RECTIFIER RIGHT LATCH SWITCH AND LEFT LATCH The asymmetric rectifier is a solid state device that pre- SWITCH vents current flow ins both directions. And it prevents the temperature rise of the power transformer by blow- 1.
Page 11 R-9X55 the food on the turntable and leaves the oven cavity througn CONVECTION MOTOR the vent in the oven cavity left side wall. The convection motor drives the convection fan and Without leaving the oven, this hot air is reheated by the con- provides the heated air.
Page 12 1-5. The 240 vol?s A.C. to the damper motor is stopped and WEIGHT SENSOR ASSEMBLY the motor turns off. When the food is placed on the turntable, the gap 2. When oven is microwave cooking: between the eictrodes increases in direct propor- Damper is in the open position tional to the weight of food.
Page 13 3D checks and ye-examine the c~~r~;:rlec:ic~s is the component being tested. Sharp recommend that wherever possible fauit-iind- ing is carried out with the supply disconnected. may in, some cases, be necessary to connect supply after the outer case has been removed.
Page 14 TEST PROCEDURE PROBLEM :ONDITION Home fuse blows when power cord is plugged into wall outlet. Fuse M8A blows when the door is opened. Fuse M8A blows when power cord is plugged into wall outlet. :oNDrTroN 88:88 does not appear in display when power cord is first plugged into wall outlet.
Page 15 R-9X55 RE = REPLACE (CK = CHECK T -- O~f’~P~K~L~M~MiM~ MiM!MiCKiCK’CKCK,R CKi CK/N\CK ’ ’ ’ ---..f-- I L-2 ../ L, ’ I ,-\ ,-\, fAi !& / LA ..J ’ -’ ,,-,’ i- / P L.J ‘./ f? ’...
Page 16: Test Procedure
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 17 R-9X55 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 4. Operate the microwave oven at HIGH for the temperature of the water rises by a value L T of (10 f 2)C. 5. Stir the water to equalize temperature throughout the vessel.
Page 18 R-9X55 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER E) Set the timer to I minutes and 45 sec. start the oven at HIGH. F) The time must be measured with stopwatch or wristwatch. Gj After 1 minutes and 45 sec.. stop the oven by opening the door.
Page 19 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 30 CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tes:ed using an ohmmeter set to its highest range. Connect the ohmmeter across the terminai 3+C of it-,e h1gi7 voltage rectifier and note the reading obtained.
Page 20 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SWITCH TEST CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch COM; Common terminal / NO; Normally open terminal / NC; Normally closed terminal S.C.;...
Page 21 R-9X55 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST An open circuit temperature fuse 150°C indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit. An open circuit thermal cut-out 170X...
Page 22 TEST PROCEDURES PROCEDURE LETTER 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 cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into troubleshooting...
Page 23 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER OPERATIONAL RELAY SYMBOL CONNECTED COMPONENTS VOLTAGE 19V.3.C. Acprox. / Ovenlamp ana Turntable motor / Amrox. ‘SV.3 Power transformer RY2(COOK) I 1 tiestrng element 1 Poprox. ! 8V.3.C RY3(HEATER! 1 Acprox. 19V.a C, amoer motor !”...
Page 24 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 25 R-9X55 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will sound. and the display will then revert to the time of day. If the above is not the case, the control unit is probably defective.
Page 26 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 5) ACL Circuit The touch control section consists of the following units A circuit to generate signals resetting the LSI to the ini- as shown in the touch control panel circuit. tial (1) Key Unit state when power is applied.
Page 27 u-9x.55 DESCRIPTION OF LSI LSI( IZA476DR) The I/O signal of the LSl(lZA476DR) is detailed in the following table. DESCRIPTION jPlN NO. 1 SIGNAL VREF Reference voltage terminal A reference voltage applied to A/D converter in the LSI. Connected to GND (OV). Terminal to chanae cookina constant lN6-IN5 Signal similar to lN7.
Page 28 DESCRIPTION /PIN NO.1 SIGNAL ieatina element drivina sianal. To turn on and off heater relay(RY3). ‘L”level during convection cooking; “H”level otherwise. luring convection cooking, the signal becomes “H”level lyhen the temperature of the oven cavity exceeds the pre- letermined temperature. Convection motor drivina sianal.
Page 29 R-9X55 DESCRIPTION IPIN NO. 1 SIGNAL Power source voltaae: VC voltage of power source circuit input. 1 -L Terminal not used. Sianal comina from touch kev. When any one of G-l line keys on key matrix is touched, a corresponding signal from POO,POl .PO4,PO5.PlO,P13.P?4.
Page 30 DESCRIPTION [PIN NO.1 SIGNAL -7%-p- Seament data sianals. Signal similar to PI 7 Kev strobe sianals. Signal applied to touch-key section. A pulse is input to RO-R3 terminal while one of G-7 line keys on key matrix is touched. Seament data sianals. Signal similar to P17 Kev strobe sianals.
Page 31 A-9X55 ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor available at its IN1 terminal. The absolute humidity sensor includes two thermis- With this voltage given, the switches SW1 to SW5 in the tors as shown in the illustration. One thermistor LSI are turned on in such a way as to change the resis- housed in the closed vessel filled with dry air while...
Page 32: Touch Control Panel
SERWCING B.On some models. the power supply cord between the 1 .Precautions for Handling Electronic Components touch control panel and the oven proper is long This unit uses CMOS LSI in the integral part of the circuits. enough that they may be separated from each other. When handling these parts, the following precautions should...
Page 33: Component Replacement And Adjustment Procedure
MEMORY READJUSTMENT PROCEDURE 1. To set the ON/OFF timing of relay RY2. When the IC3 changed in the control unit. the ON/OFF timing of relay RY2 must be set again to avoid the inrush noise. PAD ORDER DISPLAY PHONE] (Door close) (BLANK) (Plug in) A.START/CLOCK...
Page 34 OUTER CASE REMOVAL 6. Discharge the H.V. capacitor before carring out any To remove the outer case, proceed as follows. further work. 1. Disconnect oven from power supply. 7. Do not operate the oven with the outer case re- 2. Open the oven door and wedge it open. moved.
Page 35 R-9X55 WEIGHT SENSOR ASSEMBLY REMOVAL 1. CARRY OUT 3D CHECKS sor assembly to the oven cavity. 2. Remove turntable motor, referring 5. Disconnect the connector from the weight sensor assem- “TURNTABLE MOTOR REMOVAL”. bly. 3. Remove the four (4) screws holding the weight sen- 6.
Page 36 COOLING FAN MOTOR WITH FAN THERMAL CUT-OUT REMOVAL 7. Remove cooling duct and fan motor ass’y from unit. CARRY OUT 3D CHECKS. The cooling fan motor assembly is now free. 2. Disconnect wire leads from the cooling fan motor and fan thermal 8.
Page 37 R-9X55 POWER SUPPLY CORD REPLACEMENT Removal 6. Pull out the power supply cord from the hole in the rear 1. CARRY OUT 3D CHECKS. cabinet. 2. Disconnect the brown wire lead of the power supply 7. Now, the power supply cord is free.
Page 38 R-9X55 RIGHTAND LEFT LATCH SWITCHES, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT If the right latch switch, left latch switch, stop switch and 2. The contact of right latch, left latch and stop switches open within 1.2mm gap between upper monitor switch do not operate properly due to a mis-adjust-...
Page 39 DOOR ADJUSTMENT The door is adjusted by keeping the screws of each hinge loose. UTER CASE CABINET After adjustment, make sure of the following 1. Door latch heads smoothly catch the latch hook through the latch holes. and the latch head goes through the center of the latch hole.
Page 40: Microwave Measurement
MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch NARDA 8100 and doorare completed individually or collectively, the follow- NARDA 8200 ing leakage test must be performed with a survey instrument HOLADAY HI 1500 and it must be confirmed that the result meets the require- SIMPSON 380M...
Page 41: Wiring Diagram
R-9X55 b,b;JQ em N Y ;;g UIil Figure O-l. Oven Schematic-OFF Condition SCHEMATIC SCHEMATIC NOTE: CONDITION W-OVEN NOTE: CONDITION CfOVEN 1. DOOR CLOSED. 1. D30R CLOSED. 2. CCOKING TIME PROGRAMMED. 2. “DEFROSTSENSOR” PAD TOUCHED 3.VARIABLE COOKING CONTROL’I-IIGW 3. START PAD TOUCHED.
Page 42 SWEMATIC NOTE: CONDITION CFOVEN 1. C~XJR CXOSED. 2. CONVECTION PADTOUCHED. 3,DESI RED TEMO. PAD TOUCHED. 4. START PAD TOUCHED. z=LL Cc?- $3:! arsul l---1 I.--l E> ,$,lr; zr!: Figure O-3. Oven Schematic-Convection and Grill Cooking Condition SWEMATIC NOTE CONDITION OFOVEN 1, DXR CLOSED.
Page 43: Pictorial Diagram
ii .- o is 96 B LLO. I III -lr------ Ill8 B C Li...
Page 44: Control Panel Circuit
- - - - - - - - - - - - I, Erd -‘-I p--15 1 % :$&“A r--- i&E 0 oz :1--t-1--i-;: ’ ,___ _, _II-- ii\ I III I III// L -- EEli :-s! _ gg AWK’T n “3 .- LL b’...
Page 45: Printed Wiring Boad
R-9X55 , p!!? ,’ ,’ Dj’m Figure S-3. Printed Wiring Boad...
Page 46: Parts List
R-9X55 PARTS LIST Note: The voltage supllied to the part “*” are greater than 250V. DESCRIPTION Q’TY CODE PART NO. REF.NO. ELECTRICAL PARTS RHDZAO32WREO High voltage rectifier ass'y l- 1 FH-HZAO34WREO Thermistor ass'y l- 2 QACCAA035WREO Power supply cord l- 3...
Page 47 Note: The voltage supllied to the part “*” are greater than 250V. DESCRIPTION :ODE REF. NO. PART NO. VCFAB31CW476M Capacitor 47uF VCKYDllCY103N Capacitor O.OluF C6-7 RC-KZAO31DREO Capacitor O.luF VCEAB31EW226M Capacitor 22uF VCKYDllHFlO4Z Capacitor O.luF VCKYDllCY103N Capacitor 0.0luF VCKYDllHBlOlK Capacitor 100pF VCFAB31CW106M Capacitor 1OuF VCKYDllHFlO4Z...
Page 48 Note: The voltage supllied to the part “*” are greater than 25OV. Q’TY PART NO. DESCRIPTION :ODE REF. NO. RRLY-AO88DREO Relay (OMIF-S-118LMC) RRLY-AO78DREO Relay (OJ-SH-118LM) RY4-6 RALM-A007DREO Buzzer (PKM22EPT) SP40 RTRNPA023DREO Transformer RH-VZAOlODREO Varistor (15G471K) VRSl lVHEHZlGl///-1 IZener diode @IT161) RH-EZA105DREO Zener diode (RD4.3ESB2) FPNLCA998WRKO...
Page 49 lltage supllied to the part ‘I*’ are greater than 250V. Note: The DESCRIPTION 1 REF. NO. PART NO. PCUSUA289WRPO Weight sensor cushion LANGQA369WRPO Thermal cut-out mounting angle (from serial no. 9303xxxxx LANGQA369WRPO Thermal cut-out mounting angle (fromserial no.~303xxxxx) PCUSUA374WRPO Cushion PSKR-A266WRWO Separate angle PCOVWAO12W'RFO Insulator...
Page 50 Note: The voltage supllied to the part “*” are greater than 250V. Q’TY ZODE DESCRIPTION PART NO. REF. NO. XOTSD4OP12000 Screw; 4mm x 12mm 7-24 7-25 Lx-NZO029YBEO Nut; Steam duct mounting 7-26 XNESD40-32000 Nut; 4rrun x 3.2mm 7-27 XNFJJW40-32000 Nut; 4mm x 3.21-sn 7-28 XWSUW40-10000 Washer;...
Page 52 CONTROL PANEL PARTS DOOR PARTS --------------------------- ‘93 SHARP CORP. (03K0.75E) Printed I” Austraila...

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