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R-4A68

SHARP CORPORATION

SERVICE MANUAL

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

MODEL

R-4A68

S3613R4A68PX/

MICROWAVE OVEN

TABLE OF CONTENTS

Page

CAUTION, MICROWAVE RADIATION .................................................................................................................  1
WARNING .............................................................................................................................................................. 1
PRODUCT SPECIFICATIONS .............................................................................................................................  2
GENERAL INFORMATION .................................................................................................................................... 2
APPEARANCE VIEW ...........................................................................................................................................  3
OPERATION SEQUENCE ....................................................................................................................................  4
FUNCTION OF IMPORTANT COMPONENTS ....................................................................................................  5
SERVICING ..........................................................................................................................................................  6
TEST PROCEDURE .............................................................................................................................................  8
TOUCH CONTROL PANEL ................................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...............................................................  18
MICROWAVE MEASUREMENT ........................................................................................................................  23
WIRING DIAGRAM .............................................................................................................................................  24
PICTORIAL DIAGRAM .......................................................................................................................................  25
CONTROL PANEL CIRCUIT ............................................................................................................................... 26
PRINTED WIRING BOARD ................................................................................................................................. 27
PARTS LIST .......................................................................................................................................................  28

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Summary of Contents for R-4A68

Page 1: ... OVEN TABLE OF CONTENTS Page CAUTION MICROWAVE RADIATION 1 WARNING 1 PRODUCT SPECIFICATIONS 2 GENERAL INFORMATION 2 APPEARANCE VIEW 3 OPERATION SEQUENCE 4 FUNCTION OF IMPORTANT COMPONENTS 5 SERVICING 6 TEST PROCEDURE 8 TOUCH CONTROL PANEL 14 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 18 MICROWAVE MEASUREMENT 23 WIRING DIAGRAM 24 PICTORIAL DIAGRAM 25 CONTROL PANEL CIRCUIT 26 PRINTED WIRING BOAR...

Page 2: ...R 4A68 ...

Page 3: ...sed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized WARNING Never oper...

Page 4: ...50 MHz Case Dimensions Width 550 mm Height 314 5 mm Depth 446 mm Cooking Cavity Dimensions Width 378 mm Height 217 mm Depth 425 mm Turntable diameter 360mm Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate HIGH Full power throughout the cooking time MEDIUM HIGH approx 70 of Full Power MEDIUM approx 50 of Full...

Page 5: ...R LEVEL PAD Press to select microwave power setting If not pressed HIGH is automatically selected f STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven during cooking press twice to cancel cooking programme g INSTANT COOK START PAD Press once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is pressed during cooking Press to start ...

Page 6: ...e following condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOKING 1st latch switches COM NO Closed Open 2nd interlock relay control switch COM NO Closed Open Monitor switch COM NC Open Closed The circuits to the power transformer fan motor and turntable motor are cut off when the 1st latch switch and 2nd interlock relay control switch are made open The oven lamp remains on even if...

Page 7: ...e thermal cut out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control unit Under normal operation the oven thermal cut out remains closed How ever when abnormally high temperatures are reached within the oven cavity the oven thermal cut out will open a...

Page 8: ... and reconnect the leads to the primary of the power transformer REMEMBER TO CHECK 4R 1 Reconnectallleadsremovedfromcomponentsduring testing 2 Replace the outer case cabinet 3 Reconnect the supply 4 Run the oven Check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on the oven turntable close the door and ...

Page 9: ...t operate prop erly when STOP CLEAR pad is touched Oven lamp does not light at door opened Display appears Oven does not start when the START pad is touched Display appears Oven lamp does not light Dis play appears Fanmotordoesnotoperate Dis play appears Turntable motor assembly does not operate Display appears Oven or any electrical parts does notstopwhencookingtimeis0or TOP CLEAR pad is touched ...

Page 10: ...x t 4 187 V x T P W 4 187 x V x T t Our condition for water load is as follows Room temperature around 20 C PowersupplyVoltage Ratedvoltage Water load 1000 g Initial temperature 10 2 C Heating time 47 sec P 90 x T Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 1...

Page 11: ...luding the magnetron filament CARRY OUT 3D CHECKS Disconnect the leads to the primary winding of the power transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three windings The following readings should be obtained a Primary winding approx 1 13 Ω b Secondary windi...

Page 12: ... the capacitor is normal If incorrect reading are obtained the high voltage capacitor must be replaced CARRY OUT 4R CHECKS E 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 Plunger Operation COM to NO COM to NC Released O C S C Depressed S C O C COM Common termi...

Page 13: ...OUT 4R CHECKS I BLOWN FUSE 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 If the fuse M8A is blown when the door is opened check the 1st latch switch 2nd interlock relay control switch 2nd interlock relay monitor switch and monitor resistor If the fuse M8A...

Page 14: ...ntrol unit and make sure the door sensing switch is closed either close the door or short the door sensing switch connecter Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP CLEAR pad marking momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the co...

Page 15: ...tor does not light up CARRY OUT 3D CHECKS STEPS OCCURANCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at Check supply voltage and oven power cord POWER terminal of CPU connector CN A 2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 3 Only pattern at a is broken Insert jumper wire J1 an...

Page 16: ...ce Circuit This circuit generates voltages necessary in the control unit Symbol Voltage Application VC 5V LSI IC1 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3 Synchronizing Signal Circuit Thepowersourcesynchronizingsignalisavailableinorder to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 4 ACL Circuit ...

Page 17: ...T Digit selection signal 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 light emitting diode 10 AIN3 IN Terminal to change cooking constant 11 R50 OUT Segment data signal Signal similar to R70 12 R51 OUT Segment data signal Signal similar to R70 Key strobe signal Signal applied...

Page 18: ...R63 will be input into R82 23 R83 IN Signal coming from touch key When either one of G11 line keys on key matrix is touched a corresponding signal out of R51 R52 R53 R60 R61 R62 R63 will be input into R83 24 R90 IN Signal coming from touch key When either one of G12 line keys on key matrix is touched a corresponding signal out of R51 R52 R53 R60 R61 R62 R63 will be input into R90 25 R91 OUT Oven l...

Page 19: ...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 long enough that they may be separated from each other For those models therefore it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper in this case you must short both ends o...

Page 20: ...he entire case from the oven 6 Discharge the H V capacitor before carrying out any further work 7 Do not operate the oven with the outer case removed N B Step 1 2 and 6 from the basis of the 3D checks CAUTION DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING 1 CARRY OUT 3D CHECKS 2 Disconnect wire leads from power transformer magnetron and capacitor terminals 3 Remove...

Page 21: ...her from the turntable motor shaft 8 Now the turntable motor is free HOWTORE INSTALLTHETURNTABLEMOTORCOVER 1 Remove the one 1 screw which is fixed on the bottom plate left near by the turntable motor cover This screw will be used at the following step 3 2 Insert the two 2 tabs of the turntable motor cover into the two 2 slits of the bottom plate left 3 Hold the turntable motor cover to the bottom ...

Page 22: ...usethe hole for shaft of it may become bigger than a standard one 6 Now the fan motor is free INSTALLATION 1 Install the fan blade to the fan motor shaft according to the following procedure 1 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 2 Apply the screw lock tight into the hole for shaft of the fan blade 3 Install the fan blade to the shaft of fan mo...

Page 23: ...ATCH HEADS LATCH HOOK 2ND INTERLOCK RELAY CONTROL SWITCH MONITOR SWITCH SWITCH LEVER 1ST LATCH SWITCH If the 1st latch switch 2nd interlock relay control switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 1 Loosen the two 2 screws holding latch hook to the oven cavity front flange 2 Withdoorclosed adjustlatchhookbymovingitbackand forth ...

Page 24: ...les of the lever and lift up the choke cover by inserting a putty knife in the order shown in Figure C 5 5 Release choke cover from door panel 6 Now choke cover is free Putty Knife Door frame Choke Cover 12 11 10 9 8 7 6 5 4 3 2 1 Figure C 5 Door Disassembly 7 Release two 2 pins of door panel from two 2 hole of upper and lower oven hinges by lifting up 8 Now door assemblyl is free from oven cavity...

Page 25: ...crowave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M 2 Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material suc...

Page 26: ...TOR OVEN LAMP MONITOR SWITCH CONTROL UNIT THERMAL CUT OUT 1ST LATCH SWITCH B1 B2 A5 A3 EARTH BLU BRN 220V 50Hz OL FM TTM N O RY 1 G Y COM FUSE M8A A1 TEMP FUSE RY 2 2ND INTERLOCK RELAY MONITOR RESISTOR 0 8 20W LIVE NEUTRAL 2ND INTERLOCK RELAY CONTROL SWITCH POWER TRANSFORMER MAGNETRON H V RECTIFIER TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH CONTROL UNIT THERMAL CUT OUT 1ST LATCH SWITCH B1 ...

Page 27: ...OM N O LSI CN B RY2 2 1 GRN GRY CN A 1 2 ORG 3 WHT WHT WHT ORG GRY GRN GRY GRY WHT WHT FAN MOTOR ORG ORG CN B CN A GRY WHT WHT ORG WHT W H T RY1 1 2 1 3 OVEN LAMP AND SOCKET BLUE MARK RED ORG BLU EARTH G Y WHT RED BRN NOTE Live ORG wire must be connected to the terminal with blue mark on the oven light socket RED RED ORG WHT BLK RED MAGNETRON TEMPERATURE FUSE 2ND INTERLOCK RELAY CONTROL SWITCH 1ST...

Page 28: ...50 R68 120 1 5 10 14 15 20 25 28 IC1 IZA690DR VSS R52 R51 R50 AIN3 R42 R41 R40 R72 PULSE INT2 KEO RESET R70 XIN XOUT R53 R60 R61 R62 R63 R81 R82 R83 R90 R91 R92 VDD G12 G11 G10 G 9 G 8 G 7 G 6 G 5 G 4 G 2 G 1 R54 D54 R55 D55 R56 D56 R57 D57 R58 D58 R52 58 15K x 7 5 4 3 2 1 6 7 8 9 0 STOP CLEAR Chicken Pieces START INSTANT COOK POWER LEVEL NOTE LIGHT EMITTING DIODE CONTROL UNIT KEY UNIT IF NOT SPEC...

Page 29: ...27 R 4A68 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 3 Printed Wiring Board ...

Page 30: ...1 AA C4 VCKYD11CY103N Capacitor 0 01uF 16V 1 AH C6 RC KZA132DRE0 Capacitor 0 1uF 50V 1 AC C10 VCKYB11EX103N Capacitor 0 01uF 25V 1 AA C11 VCKYD11CY103N Capacitor 0 01uF 16V 1 AH C20 VCEAB31HW104M Capacitor 0 1uF 50V 1 AB C21 VCEAB31VW106M Capacitor 10uF 35V 1 AB C30 RC KZA132DRE0 Capacitor 0 1uF 50V 1 AC CF1 RCRS A012DRE0 Ceramic resonator CST4 00MGW 1 AD D1 RSRCDA013DRE0 Diode bridge S1NB10 1 AG ...

Page 31: ...anel 1 BA 5 2 HPNL A655WRE0 Door screen 1 AL 5 3 GWAKPA414WRR0 Door frame 1 AT 5 4 GCOVHA355WRF0 Choke cover 1 AK 5 5 PSHEPA336WRP0 Sealer film 1 AF 5 6 LSTPPA139WRF0 Latch head 1 AF 5 7 MSPRTA084WRE0 Latch spring 1 AA MISCELLANEOUS 6 1 TSPCNC321WRR0 Rating label 1 AE 6 2 FW VZB490WRE0 Switch harness 1 AG 6 3 FW VZB503WRE0 Main wire harness 1 AU 6 4 QW QZA150WRE0 High voltage wire B 1 AF 6 5 QW QZ...

Page 32: ...30 R 4A68 HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION ...

Page 33: ... 6 15 1 5 4 5 7 1 4 11 7 1 7 4 7 7 4 6 7 5 1 15 7 8 4 9 1 13 7 5 4 1 4 7 1 9 4 4 1 3 1 4 1 3 1 14 1 1 1 11 1 12 7 9 2 3 7 8 2 2 4 15 7 9 2 3 2 3 6 16 6 10 4 8 7 1 1 7 1 8 7 1 4 2 A 4 3 7 2 7 6 4 10 6 8 6 9 1 6 1 17 7 12 6 5 7 6 1 10 7 3 1 2 7 6 6 1 7 9 7 7 7 9 7 8 7 1 1 16 4 14 4 13 7 13 7 11 4 16 A 4 12 4 17 ...

Page 34: ...1 2 3 A B C D E F G H A B C D E F G H 5 5 5 4 5 1 5 2 5 6 5 7 5 3 7 10 7 10 7 10 Actual wire harness may be different from illustration 6 3 6 2 6 4 6 6 6 7 3 2 1 3 2 2 3 2 3 3 2 3 1 3 3 CONTROL PANEL PARTS MISCELLANEOUS DOOR PARTS ...

Page 35: ... ASSEMBLY FPADBA317WRK0 PLASTIC BAG SSAKHA032WRE0 Not replaceable items PACKING CASE SPAKCC761WRE0 BOTTOM PAD ASSEMBLY FPADBA318WRK0 TURNTABLE TRAY MENU LABEL TURNTABLE SUPPORT TRAY PACK SPADFA389WRE0 INTO THE OVEN CAVITY WARRANTY CARD INSTRUCTION BOOKS THAI ENGLISH COOK BOOKS THAI ENGLISH COOKING WARE HOLDER SPADFA396WRE0 VIDEO TAPE ...

Page 36: ...34 R 4A68 96SHARP CORP 03U0 07E Printed in Japan ...

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