Sharp R-3A55 Service Manual

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R-3A55

SHARP

SERVICE MANUAL

S8304

R3A55PJ/

MICROWAVE OVEN

-.-

_~__

Momx R-3A55

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

TEST PROCEDURE

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

TOUCH CONTROL

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

COMPONENT

REPLACEMENT

AND ADJUSTMENT

PROCEDURE

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

MICROWAVE

MEASUREMENT

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

WIRING DIAGRAM

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

PICTORIAL

DIAGRAM

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

...2 8

CONTROL

PANEL CIRCUIT

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

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

.30

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

SHARP CORPORATION

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Summary of Contents for Sharp R-3A55

Page 1 R-3A55 SERVICE MANUAL SHARP S8304 R3A55PJ/ MICROWAVE OVEN ” _~__ Momx R-3A55 In interests of user-safety the oven should be restored to its original condi- TABLE OF CONTENTS page GENERAL IMPORTANT INFORMATiON..................... WARNING ....................................................... RODUCT SPECIFICATIONS VIEW ............................
Page 3 SERVICE MANUAL PRODUCT SPECIFICATION MICROWAVE OVEN R-3A55 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. OPEARTING SEQUENCE 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 Fb3A55 PRODUCT SPECIFICATIONS DESCRIPTION ITEM 240 Volts Power Requirements 50 Hertz Single phase, 3 wire earthed 1.35 kW Approx. 6.1 A Power Consumption Power Output 750 watts nominal of RF microwave energy (AS 2895 1986) 850 watts (IEC-705-1988 Operating frequency of 2450MHz Case Dimensions Width 520mm...
Page 5 R-3A55 APPEARANCE VIEW .fi (Top) /‘- 8. Touch control panel 1. Ventilation openings 9. Digital readout 2. Oven lamp 10. Wave guide cover 3. Door hinges 11. Access cover for oven lamp replacement 4. Door safety latches 12. Power supply cord 5.
Page 6 OPERATION SEQUENCE OFF CONDITION The circuits to the power transformer, fan motor and Closing the door activates all door interlock switches turntable motor are cut off when the 1st. latch switch, (1 st. latch switch, 2nd. latch switch and stop switch) 2nd.
Page 7 FUNCTION OF IMPORTANT COMPONENTS ASYMMETRIC RECTIFIER DOOR OPEN MECHANISM The asymmetric rectifier is a solid state device that pre- The door is opened by pushing the open button on the vents current flow in both directions. And it prevents control panel, refer to the Figure D-l. temperature rise of the power transformer by blowing the...
Page 8 R-3A55 TURNTABLE MOTOR THERMAL CUT-OUT TC 145”@(OVEN) The turntable motor drives the turntable roller assembly to The thermal cut-out located on the top of the oven cavity is rotate the turntable. designed to prevent damage to the oven if the foods in the...
Page 9 / an insulated screwdriver. carry out 30 checks and re-examine the connections the component being tested. Sharp recommend that wherever possible fault-find- ing is carried out with the supply disconnected. may in, some cases, be necessary to connect supply after the outer case has been removed, this event carry out 30 checks and then disconnect the leads to the primary of the power transformer.
Page 10 R-3A55 TEST PROCEDURE POSSIBLE CASE AND DEFECTIVE ’ CK 5 (I) &p CONDITION supply .cord is plugged intc wall outle?. “88:88” does not appear in drs :ONDITION Display does not ooeratt properly when STOPICLEAF -!- I pad IS touched. 1 Oven iamp does not irah? a r‘...
Page 11 TEST PROCEDURES PROCEDURE COMPONENT TEST LElTER MAGNETRON TEST 1 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 12 TEST PROCEDURES PROCEDURE COMPONENT TEST LElTER of the water rises by a value A T of 4. Operate the microwave oven at HIGH for the temperature (10 ?I 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 13 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 14 TEST PROCEDURES PROCEDURE COMPONENT TEST LEl-l-ER 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 kL2 in the other direction. CARRY OUT 4R CHECKS ASYMMETRIC ASYMMETRIC...
Page 15 R-3A55 TEST PROCEDURES PROCEDURE COMPONENT TEST LElTER THERMAL CUT-OUT TEST CARRY OUT 3fJ CHECKS Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter. make a continuity test across the two terminals as described in the table below.
Page 16 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN FUSE F M8A CARRY OUT 3D CHECKS 1. If the fuse M8A is blown, there could be shorts or ground in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness. 2.
Page 17 R-3A55 RELAY TEST CARRY OUTm CHECKS Remove the outer case and check voltage between Pin Nos. 3 and 5 of the 3 pin connector (A) on the control unit with an A.C. voltmeter. The meter should indicat 240 volts, if not check oven circuit.
Page 18 9-3A55 TOUCH CONTROL PANEL ASSEMBLY OUTRINE OF TOUCH CONTROL PANEL 3) Synchronizing Signal Circuit The touch control section consists of the following units The power source synchronizing signal is available as shown in the touch control panel circuit. order to compose a basic standard time in the clock cir- cuit.
Page 19 DESCRIPTION OF LSI LSI(IZA496DR) The I/O signal of the LSl(lZA496DR) is detailed in the following table. Description pi” No. ~ ;z;; voltaqe: -30V Anode (seqment) of Fluorescent Displav illumination Vp voltage of power source circuit input. Siqnal cominq from touch kev. When either one of G12 line keys on key matrix is touched, a corresponding signal will be input into ROo.
Page 20 -r / Description ) Pin No. ( Signal Diqit selection sianai. Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display.
Page 21 Description Seqment data siqnal. Signal similar to D8. Kev strobe siqnal. Signal applied to touch-key section. A pulse signal is input to ROo-ROs terminal while one of G6 line keys on key matrix is touched. Seqment data sianal. Signal similar to 08. Kev strobe siqnal.
Page 22 +3A55 SERVICING touch control panel and the oven itself is so short that the 1 .Precautions for Handling Electronic Components two can’t be separated. For those models, check and re- This unit uses CMOS LSI in the integral part of the pair all the controls (sensor-related ones included) of the circuits.
Page 23 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC- TIONS BELOW .BRBEFORE OPERATING THE OVEN. CARRY OUT 3D CHECKS. 2. Door hinge, support or latch hook is damaged. 3. The door gasket or seal is damaged. Make sure that a definite “click”...
Page 24 OVEN LAMP AND LAMP SOCKET REMOVAL 1. CARRY OUT aCHECKS 3. Remove the lamp holder from partition angle. 2. Disconnect the wire leads from the lamp socket. 4. Remove the oven lamp from the lamp socket. TURNTABLE MOTOR REMOVAL 4. Disconnect wire leads from turntable motor.
Page 25 POSITIVE LOCK3 CONNECTOR (NO-CASE TYPE) REMOVA Posmve iock@ connector Push the lever of positive lock% connector. Pull down on the positive lock% connector. CAUTION: WHEN YOU CONNECTING THE POSITIVE LOCKQ CONNECTORS THETERMI- NALS, INSTALL THE POSITIVE LOCK” SO THAT THE LEVER FACES YOU Figure C-l.
Page 26 DOOR REPLACEMENT AND ADJUSTMENT REMOVAL After adjustment, make sure of the following 1. Disconnect oven from power supply and remove turn- 1. Door latch heads smoothly catch latch hook through table tray and turntable ring from oven cavity. latch holes and that latch head goes through center of Remove the outer case cabinet,...
Page 27 DOOR DISASSEMBLY Remove door assembly, refer to “Door Replacement”. Replacement of door components are as follows: 1. Place door assembly on a soft cloth with latches facing Note: As the engaging part of choke cover and door panel are provided at 18 places, do not force any particular part.
Page 28 6. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven. SHARP Microwave leakage measurement at 5 cm distance...
Page 29 R-3A55 <I-- s k$ qcoM IN,o. i?5! > / $e O-l. Oven Schematic-OFF Condition y F. 7; z 2’ _ -- T - *-L.-I.- - 48 ST-&&e;\” It T*c_r: -(-7-o:‘:-, i 4. _ “V _-_-- ‘2 -I z r-b3 z&...
Page 30 u .-...
Page 31 R-3A55 CI .- ii e cy - .I I ’ ( +-^/VT-----+ = ‘.%\ ’ ?g ~~~~~ fcb+.++ / 1 ( i ---,g $1 ; && / iq r I Cd e-‘,“in-+ WLiEti g 8 3gig I ‘Y------ T#---- ‘$ &...
Page 32 -3A55 Figure S-3. Printed Wiring Boad...
Page 33 PARTS LIST Note: The voltage supllied to the part ‘I*” are greater than 25OV. REF. NO. PART NO. DESCRIPTION Q’TY CODE ELECTRICAL PARTS l- 1 QSW-mllOWRE0 1st. 2-d. a;ld stop switches 1 -k- 34 . i- 2 QSW-MAlliWREO ‘-lczitor switch .?!! l- 3 RV-MZA197WREO...
Page 34 R-3A55 Note: The voltage supllied to the part “*” are greater than 250V. PART NO. DESCRIPTION 1 REF. NO. 1 Q’T-ODE ;, 2 T 1.7 - Re;ay (VX324) AO8lDREG zil, --.LJ^ SP40 ?&,I%-A0;43REO Buzzer (PKM22EPT-CA) RTPJPA0'793Rl30 Transformer i,';;iS1 ?&-VCAA0323RE0 Varistor (lOG47l.K) :"TJEE-:2:61,...
Page 35 Note: The voltage supllied to the part “*” are greater than 250V. REF. NO. PART NO. DESCRIPTION SCREWS, NUTS AND WASHERS 7- 1 XOTSD40P12000 Screw; 4mm x 12n-1 ?- 2 XFPSD40P08KOO Screw; 4mm x 7- 3 XiITSD40P08000 Screw; 4mm x 7- 4 XHSSE40P08000 Screw;...
Page 36 R-3A55...
Page 37 CONTROL PANEL PARTS ’ /’ /’ ‘\ \ ---...
Page 38 R-3A55 Actual wire harness may be different than illustration. PACKiNG AND ACCESSORIES 0 PACKING PAD KIT ‘? CPADBAICZWRKO &? TURNTABLE TRAY 0 DOOR PROTECTION SHEET SPADPA204WREO OPERATION MANUAL ‘e e POLYETHYLENG COOK BOOK SSAKHA034WREO TURNTABLE SUPPORT /’ MICROWAVE TRAY PACK...
Page 40 SHARP ‘93 SHARP CORP. (07K0.75E) Printed tn Austraha...

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