Sharp R-24ST Service Manual Download Page 29

Page: 29 / 40

R-24ST/R-2B34 - 29

*INDICATES COMPONENTS WITH
POTENTIAL ABOVE 250V

Figure 0-1 Oven Schematic-OFF Condition, Door Closed.

Figure 0-2 Oven Schematic-ON Condition, Open Closed.

T: HIGH VOLTAGE

TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING

MG: MAGNETRON

H.V. RECTIFIER

C:
H.V. CAPACITOR
0.91

F/ AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LIGHT

D72

D71

D70

SW3: STOP

SWITCH

CONTROL UNIT

TC: OVEN THERMAL

CUT-OUT 125˚C

SW1: MONITORED

LATCH SWITCH

SW2: MONITOR

SWITCH

TTM

N.O.

N.C.

RY-1

COM.

N.O.

COM.

RY-2

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

F1: FUSE
( F8A)

0.22

/AC250V

680K/ 0.5W

10M/ 0.5W

NOISE SUPPRESSION COIL

0.0033

/ 250V

0.0033

/ 250V

NOISE FILTER

230V

50Hz

T: HIGH VOLTAGE

TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING

MG: MAGNETRON

H.V. RECTIFIER

C:
H.V. CAPACITOR
0.91

F/ AC2100V

TURNTABLE MOTOR

FAN MOTOR

OVEN LIGHT

D72

D71

D70

SW3: STOP

SWITCH

CONTROL UNIT

TC: OVEN THERMAL

CUT-OUT 125˚C

SW1: MONITORED

LATCH SWITCH

SW2: MONITOR

SWITCH

TTM

N.O.

N.C.

RY-1

COM.

N.O.

COM.

RY-2

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

F1: FUSE
(F8A)

0.22

/AC250V

680K/ 0.5W

10M/ 0.5W

NOISE SUPPRESSION COIL

0.0033

/ 250V

0.0033

/ 250V

NOISE FILTER

230V

50Hz

SCHEMATIC DIAGRAMS

Summary of Contents for R-24ST

Page 1: ... 8 OPERATION SEQUENCE 9 FUNCTION OF IMPORTANT COMPONENTS 10 TROUBLESHOOTING GUIDE 11 TEST PROCEDURE 12 CONTROL PANEL ASSEMBLY 18 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 22 MICROWAVE MEASUREMENT 27 TEST DATA AT A GLANCE WIRING REWIRING 28 SCHEMATIC DIAGRAMS 29 PICTORIAL DIAGRAM 30 CONTROL PANEL CIRCUIT DIAGRAM 31 TACT SWITCH DIAGRAM 32 PRINTED WIRING BOARD DIAGRAM 33 PRINTED WIRING BOARD OF ...

Page 2: ...äytetään väärin tai jos se kytketään väärin Kaikkien mikroaaltoliitäntöjen sekä syöttö että ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä ADVARSEL MIKRØBOLGESTRÅLING Personell må ikke utsettes for ...

Page 3: ...s above 250V All the parts marked on the parts list may cause undue microwave exposure by themselves or when they are dam aged loosened or removed WARNING SERVICE MANUAL MICROWAVE OVEN 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 entire text of ...

Page 4: ...schakeld Wacht 60 seconden voordat u de verbinding van de hoogspannings condensator m a w de verbindingsdraad van de hoogspanningsgelijkrichter met een geïsoleerde schroevedraaier kortsluit tegen het chassis Sharp beveelt ten sterkste aan dat voor zover mogelijk defecten worden opgespoord wanneer de stekker uit het stopcontact is gehaald Soms is het nodig om de stroomtoevoer weer tot stand te bren...

Page 5: ...lizar una prueba de fugas de microondas KOM IHÅG ATT KONTROLLERA 3 STEG 1 Koppla från strömkällan 2 Öppna dörren på glänt 3 Ladda ur högspänningskondensatorn Sharp rekommenderar att felsökning sker med strömmen fränkopplad Ibland kan det var nödvändigt att koppla på strömmen efter det att höljet avlägsnats utför da 3 Steg kontrollen och koppla sedan från ledarna till transformatorns primärsida Se ...

Page 6: ...pecific test be performed These tests are given a proce dure letter which will be found in the Test Procedure section IMPORTANT If the oven becomes inoperative because of a blown fuse F1 in the monitored latch switch monitorswitch circuit checkthemonitored latch switch and monitor switch and before replacing the fuse F1 QUATTRO VERIFICHE IMPORTANTI DA NON DIMENTICARE 1 Ricollegare tutti i condutto...

Page 7: ...HR setting 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 EXPRESS DEFROST buttons EXPRESS COOK buttons POWER LEVEL button STOP button 1MIN START button TIMER WEIGHT PORTION knob Net Weight Approx 13 5 kg WARNING THIS APP...

Page 8: ... the suitable button having the same symbol or do the necessary operation Stir Turn over Weight Portion Indicator Microwave power level Cooking in progress indicator 1 DIGITAL DISPLAY 2 EXPRESS DEFROST buttons 3 EXPRESS COOK buttons 4 POWER LEVEL button 5 STOP button 6 1 MIN STARTbutton 7 TIME WEIGHT PORTION knob KG 1 2 3 4 5 6 7 1 Door 2 Door hinges 3 Oven lamp 4 Waveguide cover 5 Control panel 6...

Page 9: ...en door is opened the oven lamp comes on at this time MICROWAVE COOKING CONDITION HIGH COOKING Enter a desired cooking time with the touching TIME pad and start the oven with touching START pad Figure 0 1 on page 29 1 The line voltage is supplied to the primary winding of the power transformer The voltage is converted to about 3 3 volts A C output on the filament winding and high voltage of approx...

Page 10: ...e turntable roller assembly to rotate the turntable FAN MOTOR The fan motor drives a blade which draws external cool air This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron This air flows through the oven cavity to remove steam and vapors given off from the heating foods It is then vented through the exhaust air vents at the rear of oven cavity NOISE F...

Page 11: ... when in operation Fan motor does not operate Turntable motor assembly does not operate Oven or electrical parts does not stop when timer is at 0 Oven seems to be operating but little or no heat is produced in oven load Microwave power level is set at 800W Oven does not operate properly during the variable cooking condition except 800w cooking condition Oven goes into cook cycle but shuts down bef...

Page 12: ...out with the microwave oven in a fully assembled NEVERTOUCHANYPARTINTHECIRCUITWITHYOURHANDORANINSULATEDTOOLWHILE THE OVEN IS IN OPERATION TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 190 mm 2 Temperature of the o...

Page 13: ...gerous to work near this part when the oven is on NEVER make any voltage measurements of the high voltage circuits including the magnetron filament Heat up for 55 sec B POWER TRANSFORMER TEST 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 ...

Page 14: ...stance about 10 MΩ because of its internal 10 MΩ resistance F When the internal wire is opened in the high voltage capacitor the capacitor shows an infinite resistance G Theresistanceacrossalltheterminalsandthechassismustbeinfinitewhenthecapacitoris normal If incorrect reading are obtained the high voltage capacitor must be replaced CARRY OUT 4R CHECKS C HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CH...

Page 15: ... approx 20 C Closed circuit If incorrect readings are obtained replace the thermal cut out An open circuit thermal cut out OVEN indicates that the foods in the oven may have caught fire this may be due to over heating produced by improper setting of the cooking timer or failure of the control panel BLOWN FUSE F1 G H NOISE FILTER TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of t...

Page 16: ...t is TRANSLESS CIRCUIT and all electrical parts are used at A C line voltage CARRY OUT 3D CHECKS 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 360 Ω Turntable motor Approximately 12 15 kΩ If incorrect readings are obtained replace the motor CARR...

Page 17: ...To protect the electronic circuits this model is provided with a fine foil pattern added to the input circuit on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated voltage is not applied between Pin Check supply voltage and oven pow...

Page 18: ...ircuits as shown in the touch control panel circuit The principal functions of these circuits and their related signals are explained below Tact Switch Signals generated in the LSI are sent to the tact switches through R60 R61 R62 and R63 When a tact switch is touched a signal is completed through the tact switch and passed back to the LSI through R81 to perform the function that was requested Con...

Page 19: ...he Model By using the A D converter contained in the LSI DC voltage in accordance with the Model in operation is applied to set up its function 21 VSS IN Power source voltage 0V VSS voltage of power source circuit input 22 R70 OUT Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cooking and H levelwhilenotcooking Inother...

Page 20: ...ck oscillation frequency control output Output to control oscillation input of XIN 35 RESET IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is supplied Temporarily set L level the moment power is supplied at this time the LSI is reset Thereafter set at H level 36 HOLD IN OUT Connected to VDD 37 VLC IN Signal synchronized with commercial power source frequenc...

Page 21: ...tor 2SA1267Y KRA101M KRC101M KRC105M panel while keeping it connected to the oven B On some models the power supply cord between thetouchcontrolpanelandtheovenislongenough 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 in this case you must short both ends of the d...

Page 22: ... the power transformer 4 Remove the four 4 screws holding the transformer to base plate 5 Remove the transformer 6 Now the power transformer is free To remove the components proceed as follows 1 CARRY OUT 3D CHECKS 2 Disconnect all the leads and terminal of high voltage rectifier from high voltage capacitor 3 Remove one 1 screw holding earth side terminal of high voltage rectifier and remove capac...

Page 23: ...NT 1 Disconnect the oven from the power supply 2 Remove the turntable motor cover by snipping off the material in four corners 3 Where the corners have been snipped off bent corner areas flat No sharp edge must be evident after removal of turntable motor cover 4 Disconnect the wire leads from the turntable motor and remove the one 1 screw holding the turntable motor 5 Turntable motor is now free 6...

Page 24: ...nto the square hole of the rear cabinet referring to the Power supply cord Oven cavity back plate Green Yellow Wire Brown Wire Noise filter Chassis support Blue Wire Figure C 1 b Installation of Power supply cord 2 Install the earth wire lead of power supply cord to the oven cavity with one 1 screw and nut and tighten 3 Connect the brown and blue wire leads of power supply cord to the noise filter...

Page 25: ...witch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 2 Loosen the two 2 screws holding the latch hook to the flange of the oven front face 3 With the door closed adjust latch hook by moving it back and forth and up and down In and out play of the doorallowedbytheupperandlowerpositionofthelatch hookshouldbelessthan0 5mm Thehorizontalpositio...

Page 26: ...moving screws 4 8 Release door panel from tabs of door frame and remove door frame by sliding the door panel downward 9 Now door panel with inner sealer film is free 10 Tear inner sealer film from door panel 11 Now door panel is free 12 Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head 13 Now latch head and latch spring are free 14 Rem...

Page 27: ... 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 center 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 such as glass or plas...

Page 28: ... Discharge the high voltage capacitor RE WIRING Ensure the following 1 Wires must not touch a High voltage parts Magnetron high voltage transformer high voltage capacitor and high voltage rectifier b Parts that become hot Heating elements oven lamp oven cavity magnetron and high voltage transformer c Sharp edges Bottom plates oven cavity waveguide flange chassis support and other metallic parts d ...

Page 29: ...C RY 1 COM N O COM RY 2 EARTH BLU BRN LIVE NEUTRAL G Y F1 FUSE F8A N L 0 22µ AC250V 680K 0 5W 10M 0 5W NOISE SUPPRESSION COIL 0 0033µ 250V 0 0033µ 250V NOISE FILTER 230V 50Hz T HIGH VOLTAGE TRANSFORMER WITH 150 C THERMOSTAT IN PRIMARY WINDING MG MAGNETRON H V RECTIFIER C H V CAPACITOR 0 91µF AC2100V TURNTABLE MOTOR FAN MOTOR OVEN LIGHT D72 D3 D1 D71 D70 SW3 STOP SWITCH CONTROL UNIT TC OVEN THERMAL...

Page 30: ... WHT YLW YLW YLW WHT YLW RED G Y CONTROL UNIT WHT WHT YLW BLU BRN RED RED TC THERMAL CUT OUT OVEN OL OVEN LAMP SP30 IC1 CN A RY1 CN B RY2 1 1 2 5 RED YLW WHT CN A CN B 2 RED 1 3 4 5 WHT RED WHT WHT RED YLW WHT 2 1 N O COM N O FM FAN MOTOR NOISE FILTER WHT H V WIRE B MG MAGNETRON C H V CAPACITOR H V RECTIFIER T HIGH VOLTAGE TRANSFORMER POWER SUPPLY CORD LIVE NEUTRAL WHT YLW PICTORIAL DIAGRAM ...

Page 31: ...HZ7C2 Q30 KRC 101M R2 R3 R4 R10 27k R11 27k LIQUID CRYSTAL DISPLAY CN C CN B CN A AC N OVEN LAMP FAN MOTOR TURNTABLE MOTOR HIGH VOLTAGE TRANSFORMER DOOR SWITCH NOTE AC L FM CN C 5 CN C 4 CN C 3 CN C 2 CN C 1 CN C 6 IC1 IXA086DRZZ R5 IF NOT SPECIFIED 1 4W 5 IF NOT SPECIFIED 1SS270A IF NOT SPECIFIED 0 01µF 16V 1N4005E 1N4005E LED1 LED2 LED3 10G471K VRS1 D2 ZD21 ZD20 SP30 D10 D20 D72 C80 R73 15k R70 ...

Page 32: ...R 24ST R 2B34 32 TACT SWITCH UNIT CIRCUIT DIAGRAM Figure S 3 Tact Switch Unit Circuit Diagram 1 2 3 4 SW2 5 6 SW3 SW4 SW5 SW6 SW7 CN C SW1 ...

Page 33: ... CN A 5 1 R71 R70 ZD71 D74 D20 RY2 A B C 5 6 R40 R20 R72 R60 R61 R62 R63 JW1 R41 E E 1 B R42 R11 R50 B Q30 Q40 1 1 6 21 22 42 IC1 ZD1 SW1 JSW2 JW1 F SW2 SW3 R65 R64 SW4 SW5 WH 1 SW6 SW7 SW60 C1 SP30 AC LINE VOLTAGE IS SUPPLIED TO ALL PARTS ZD40 D2 R5 R4 R3 R2 R1 CF1 R12 R31 C60 C61 C10 C22 R81 C80 D80 D72 4 1 D71 VRS1 ZD70 Q70 C71 R73 RY1 D73 E B ZD21 ZD20 C20 CN B 3 D10 R10 DIP WARNING WARNING TR...

Page 34: ...R 24ST R 2B34 34 PRINTED WIRING BOARD DIAGRAM OF SWITCH UNIT SW6 SW4 SW2 SW3 SW1 SW5 CN G DIP 6 1 6 1 CN C WHITE EH GREEN KR SW7 Figure S 5 Printed Wiring Board Of Tact Switch Unit ...

Page 35: ...4 VHD1SS270A 1 U Diode 1SS270ATA 3 AA D80 VHD1SS270A 1 U Diode 1SS270ATA 1 AA IC1 RH IXA086DRZZ U LSI 1 AZ JW1 FW VZA259DRZZ U 1 pin harness 1 AE LED1 3 VHPSLP7117E 3 U Light emitting diode 3 AC Q20 VSKRA101M 3 U Transistor KRA101M 1 AA Q21 VSKRC105M 3 U Transistor KRC105M 1 AB Q30 VSKRC101M 3 U Transistor KRC101M 1 AB Q40 VS2SA1267Y 3 U Transistor 2SA1267Y 1 AB Q70 VSKRC105M 3 U Transistor KRC105...

Page 36: ...04J U Resistor 100k ohm 1 4W 1 AA RY1 RRLY A080DRE0 U Relay OJ SH 124LM 1 AG RY2 RRLY A094DRE0 U Relay OMIF S 112LM 1 AL SP30 RALM A014DRE0 U Buzzer PKM22EPT THAI 1 AG SW60 RVR BA018WRE0 U Encoder 1 AH VRS1 RH VZA032DRE0 U Varistor 10G471K 1 AC ZD1 VHEHZ12C1 1 U Zener diode HZ12C1 1 AA ZD20 21 VHEHZ12C1 1 U Zener diode HZ12C1 2 AA ZD40 VHEHZ4C3 1 U Zener diode HZ4C 3 1 AA ZD70 71 VHEHZ7C2 1 U Zene...

Page 37: ...ly R 2B34 K 1 BH 5 CDORFW022URK0 U Door assembly R 2B34 W 1 BH 5 1 FDORFA299WRT1 U Door panel assembly All models 1 AU 5 2 FWAKPW029URK0 U Door frame assy R 2B34 W 1 BD 5 2 FWAKPK003URK0 U Door frame assy R 2B34 K 1 BD 5 2 FWAKPA038URK0 U Door frame assy R 2B34 AL 1 BD 5 2 FWAKPS017URK0 U Door frame assy R 24ST R 2B34 ST 1 BE 5 3 GWAKPR013URF0 U Door frame moulded 1 AM 5 4 PGLSPA013URE0 U Outer do...

Page 38: ...ted using screw connection LX CZA030WRE0 7 11 EXPLODED DIAGRAM OF OVEN PARTS 4 8 7 1 7 1 2 1 7 3 1 3 4 4 6 8 4 6 6 2 TTM 4 9 T 4 11 4 12 2 2 2 2 7 2 6 1 F 4 5 7 1 7 1 7 1 OL 7 2 FM 7 1 7 4 7 9 7 5 7 1 4 3 4 1 4 7 7 5 7 1 7 1 7 1 SW3 7 6 7 10 SW2 SW1 1 1 C 4 2 7 1 7 1 1 2 7 6 TC 7 7 MG 7 7 4 10 x4 x2 ...

Page 39: ...R 24ST R 2B34 39 CONTROL PANEL PARTS CONTROL PANEL PARTS DOOR PARTS DOOR PARTS 5 9 5 4 5 3 5 1 5 13 5 5 5 6 5 7 5 12 5 10 5 8 5 11 5 5 2 X4 3 8 3 5 3 4 3 3 3 8 3 2 3 7 3 6 3 1D 3 1F 3 1E 3 9 3 1 3 10 ...

Page 40: ...LY ACCESSORY HOLDER SPADPA014URE0 PRINTED MATTER 6 5 6 6 Actual wire harness may be different from illustration MISCELLANEOUS PACKING AND ACCESSORIES SHARP COPORATION 2001Printed in U K COPYRIGHT C 2001 BY SHARP CORPORATION ALL RIGHT RESERVED No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying reco...

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