Sharp R-3A88 Service Manual Download Page 27

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R-3A88

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY

NOTE: " " indicates components with potentials above 250V.

Figure O-1. Oven Schematic-OFF Condition

Figure O-2. Oven Schematic-Cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

CAPACITOR

1.07

AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL

UNIT

THERMAL

CUT-OUT

145˚(MG)

THERMAL CUT-OUT
95˚C (FAN)

1ST. LATCH
SWITCH

EARTH

BLU

BRN

220 V

˜ 50Hz

TTM

N.O.

RY-1

G-Y

COM.

FUSE

M8A

THERMAL

CUT-OUT

145˚C

(OVEN)

RY-2

MONITOR

RESISTOR

0.8/20W

2ND. INTERLOCK RELAY
CONTROL SWITCH

2ND.

INTERLOCK

RELAY

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

CAPACITOR

1.07

AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL

UNIT

THERMAL

CUT-OUT

145˚(MG)

EARTH

BLU

BRN

TTM

N.O.

RY-1

G-Y

COM.

FUSE

M8A

THERMAL

CUT-OUT

145˚C

(OVEN)

RY-2

MONITOR

RESISTOR

0.8/20W

THERMAL CUT-OUT
95˚C (FAN)

1ST. LATCH
SWITCH

220 V

˜ 50Hz

2ND. INTERLOCK RELAY
CONTROL SWITCH

2ND.

INTERLOCK

RELAY

Summary of Contents for R-3A88

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 24 WIRING DIAGRAM 25 PICTORIAL DIAGRAM 26 CONTROL PANEL CIRCUIT 27 PRINTED WIRING BOAR...

Page 2: ...R 3A88 ...

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: ...9 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 Power MEDIUM LOW approx 30 of Full Power LOW approx 10 of Full Power HELP pad REHEAT pad RICE COOK pad STEAM MENU pad MORE LESS pads INTERNATIONAL MENU pads SLOW COOK pad EASY DEFROST pad NUMBER pads POWER LEVEL pad AUTO START pad S...

Page 5: ...uch to select microwave power setting If not touched HIGH is automatically selected l STOP CLEAR PAD Touch to clear during programming Touch once to stop operation of oven during cooking touch twice to cancel cooking programme m INSTANT COOK START PAD Touch once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is touched during cooking Touch to start oven after set...

Page 6: ...he following condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOKING 1st latch switch 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: ...ows to prevent an electric shock or fire hazard THERMAL CUT OUT TC 145 C MG This thermal cut out protects the magnetron against over heating If the temperature goes up higher than 145 C because the fan motor is interrupted the ventilation open ings are blocked the thermal cut out will open and the line voltage to the power transformer will be cut off and the operation of the magnetron will be stop...

Page 8: ...nd 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 se...

Page 9: ...R 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 Display appears Fan motor does not operate Dis play appears Turntable motor assembly does not operate Display appears Oven or any electrical parts does not stop when cooking time is 0 or STOP CLEAR pad is touched Oven seems to be operat...

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 49 sec P 85 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: ...ncluding 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 4 Ω b Secondary wind...

Page 12: ...onnection of Switch Plunger Operation COM to NO COM to NC Released O C S C Depressed S C O C COM Common terminal NO Normally open terminal NC Normally close terminal S C Short O C Open circuit If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS F THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the the...

Page 13: ...onitor resistor If the fuse M8A is blown by incorrect door switching replace the defective switch s and the fuse M8A CARRY OUT 4R CHECKS CAUTION ONLY REPLACE FUSE M8A WITH THE CORRECT VALUE REPLACEMENT J 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 ...

Page 14: ...ort 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 control unit does not respond it is faulty and must be replaced If a specific pad does n...

Page 15: ...NCE 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 and solder CARRY OUT 3D CHECKS BEFORE REPAIR 4 Pattern a...

Page 16: ... control unit Symbol Voltage Application VC 5V LSI IC1 VP 34V Fluorescent display tube Grid and anode voltage VF1 2 2Vac Filament of fluorescent display tube VF2 VF1 to VF2 voltage 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on com mercial frequenc...

Page 17: ... input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to OSC1 terminal 9 OSC2 OUT Internal clock oscillation frequency control output Output to control oscillation input of OSC2 10 11 GND AVSS IN IN Connected to VC 12 AN0 IN Input signal which communicates the door open close information to LSI Door closed H level signal Door opend L le...

Page 18: ...is output in every synchronized signal period and input to the grid of the fluorescent display 36 R11 OUT Segment data signal Signal similar to P41 Key strobe signal Signal applied to touch key section A pulse signal is input to R00 R03 terminal while one of G7 line keys on key matrix is touched 37 R12 OUT Segment data signal Signal similar to P41 Key strobe signal Signal applied to touch key sect...

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: ...power supply 2 Open the oven door and wedge it open 3 Remove the six 6 screws from rear and along the right side edge of case 4 Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate 5 Lift the entire case from the unit 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 7 f...

Page 21: ...TOR GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW 1 CARRY OUT 3D CHECKS 2 Disconnect the high voltage wire of the high voltage rectifier assembly from the magnetron 3 Remove one 1 screw holding capacitor holder to oven cavity rear plate 4 Remove one 1 screw holding high voltage rectifier assembly to capacitor holder 5 Disconnect rectifier terminal...

Page 22: ... the fan motor shaft according 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 motor by pushing thefanbladewithasmall lightweight ball peenhammer or rubber mallet CAUTION Do not hit the fan blade strongly when install...

Page 23: ...e connector 5 Release the power supply cord from the rear cabinet 6 Now the power supply cord is free Re install 1 Insert the moulding cord stopper of power supply cord into the square hole of the rear cabinet 2 Install the earth wire lead of power supply cord to the bottom plate rirgt with one 1 screw and tight the screw 3 Connect the brown wire lead of power supply cord to the fuse holder correc...

Page 24: ...entodoorframebyfittingtwo 2 tabs of door frame to two 2 holes of door screen 2 Re install latch spring to the head Re install latch spring tothedoorframe Re installlatchheadtothedoorframe 3 Re install door panel to door frame by fitting nine 9 tabs of door frame to nine 9 holes of door panel 4 Hold the door panel to the door frame with two 2 screws 5 Put sealer film on door panel Refer to Sealer F...

Page 25: ...h an approvedmicrowavesurveymeter RefertoMicrowave Measurement Procedure Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle Thisfunctiondoesnotrequirethatdoorbeair tight moisture condensation tight or light tight Therefore occasionalappearanceofmoisture light or sensing of gentle warm air movement...

Page 26: ...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 27: ...UNIT THERMAL CUT OUT 145 MG THERMAL CUT OUT 95 C FAN 1ST LATCH SWITCH B1 B2 A5 A3 EARTH BLU BRN 220 V 50Hz OL FM TTM N O RY 1 G Y COM FUSE M8A A1 THERMAL CUT OUT 145 C OVEN RY 2 MONITOR RESISTOR 0 8 20W 2ND INTERLOCK RELAY CONTROL SWITCH 2ND INTERLOCK RELAY POWER TRANSFORMER MAGNETRON H V RECTIFIER CAPACITOR 1 07µ AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH CONTROL UNIT THERMAL CUT ...

Page 28: ... oven light socket CONTROL UNIT COM NO LSI CN B RY1 CN G RY2 2 1 GRN GRY CN A 1 2 3 4 5 WHT RED WHT RED GRY ORG BLK GRY GRN GRY WHT RED GRY BLK GRY BLK BLK THERMAL CUT OUT OVEN FAN MOTOR RED BLK WHT GRY CN B CN A WHT WHT BLU BRN NEUTRAL LIVE GRN GRN 2 1 5 1 ORG GRY GRY WHT WHT THERMAL CUT OUT FAN BLK RED THERMAL CUT OUT MAGNETRON WHT MONITOR RESISTOR RED GRY RED BRN FUSE M8A WHT RED BLUE MARK EART...

Page 29: ... 7K R71 4 7K R70 4 7K A B C Q72 Q71 Q70 R51 15K R52 15K R53 15K R54 15K R50 150K x 4 C50 330p x 4 Q70 Q72 2SA933 D R40 1K D50 G12 G11 G10 G 9 G 8 G 7 G 6 G 5 G 4 G 3 G 2 G 1 D51 D52 D53 D54 D56 KEY UNIT CONTROL UNIT 1 5 10 15 20 21 42 30 22 25 35 40 IC1 IZA683DR Vdsp R00 R01 R02 R03 TEST RST OSC1 OSC2 GND AVSS AN0 AN1 AN2 R33 R40 R41 R42 R43 AVCC VCC R22 R21 R20 R13 D8 D7 D6 D5 D4 BUZZ D2 INT STEA...

Page 30: ...6 D55 D54 D53 D52 D51 D50 D57 R80 25 R60 C30 R30 R31 R5 ZD2 J4 J3 J5 J6 C5 R41 C6 R7 R11 R10 D3 D5 D6 D4 J7 J1 VRS1 P S2 S1 J2 R51 R52 R53 R54 IC1 R73 R74 R75 E E E Q72 Q71 Q70 B B B B 2 1 3 4 6 7 10 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R6 R70 R72 R71 R3 R2 D2 R40 R4 31 C3 C4 CN G LOT NO CN B POWER FM TTM OL CN A SMCA SATL DOOR SW C7 26 CE1 28 29 D30 D22 27 35 C20 Q1 Q20 C50 C1 D1 RY2 D21...

Page 31: ... 47uF 16V 1 AA C4 5 VCKYD11CY103N Capacitor 0 01uF 16V 2 AH C6 VCEAB31CW476M Capacitor 47uF 16V 1 AA C7 RC KZA132DRE0 Capacitor 0 1uF 50V 1 AC C10 VCKYB11EX103N Capacitor 0 01uF 25V 1 AA C20 VCEAB31HW104M Capacitor 0 1uF 50V 1 AB C21 VCEAB31VW106M Capacitor 10uF 35V 1 AB C30 VCKYD11CY103N Capacitor 0 01uF 16V 1 AH C50 RMPTEA009DRE0 Capacitor array 330pF x 4 1 AE CF1 RCRS A012DRE0 Ceramic resonator...

Page 32: ... Thermal cut out Fan mounting angle 1 AK 4 17 PCUSGA378WRP0 Cushion 1 AL 4 18 PCUSGA388WRP0 Cushion 1 AK 4 19 PCUSUA278WRP0 Cushion 1 AC DOOR PARTS 5 1 FDORFA283WRT0 Door panel 1 AY 5 2 PSHEPA382WRE0 Sealer film 1 AH 5 3 GCOVHA342WRF0 Choke cover 1 AM 5 4 GWAKPA354WRF0 Door frame 1 AN 5 5 HPNL A657WRR0 Door screen 1 AT 5 6 LSTPPA139WRF0 Latch head 1 AF 5 7 MSPRTA084WRE0 Latch spring 1 AB 5 8 XCPSD...

Page 33: ...ROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA311WRK0 PLASTIC BAG SSAKHA034WRE0 Not replaceable items PACKING CASE SPAKCC767 WRE0 BOTTOM PAD ASSEMBLY FPADBA312WRK0 TURNTABLE TRAY OPERATION MANUAL ENGLISH OPERATION MANUAL THAI ROLLER STAY GLASS COOK WARE TRAY PAD INTO THE OVEN CAVITY WARRANTY CARD MENU LABEL COOK BOOK VIDEO TAPE TRAY HOLDER SPADFA340WRE0 PACKING AND ACCESSORIES ...

Page 34: ...3 1 12 4 13 4 12 4 11 1 4 7 1 1 3 7 6 6 10 7 6 7 3 6 14 1 9 1 17 4 2 7 2 1 5 1 1 7 6 4 6 7 3 1 4 4 10 1 1 1 2 7 5 7 5 4 1 7 1 4 3 7 1 4 4 6 2 6 1 1 7 1 16 6 11 4 7 2 4 7 5 7 5 7 6 2 2 2 4 7 5 2 3 4 9 7 1 1 14 4 14 4 8 4 5 7 4 1 11 7 8 1 10 4 18 4 19 6 15 7 1 1 9 4 17 x2 1 15 7 3 7 1 4 15 4 16 1 8 7 2 7 7 A A 7 6 1 6 6 8 ...

Page 35: ... 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H DOOR PARTS CONTROL PANEL PARTS 3 1 3 2 1 3 3 3 4 3 2 3 5 Actual wire harness may be different from illustration 6 4 6 12 6 7 6 5 6 6 5 4 5 1 5 2 5 3 5 6 5 7 5 5 MISCELLANEOUS ...

Page 36: ...34 R 3A88 96SHARP CORP 3U0 07E Printed in Japan ...

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