Sharp R-203CW Service Manual

R-300BWIn the interest of user-safety the oven should be restored to its originalcondition and only parts identical to those specified should be used.

8R-300BWDESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pushing the open button on thecontrol panel, refer to the Figur

9R-300BWTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.When troubl

10R-300BWHome fuse or circuit breaker blows whenpower cord is plugged into wall receptacleMonitor fuse blows when power cord isplugged into wall recep

11R-300BWB POWER TRANSFORMER TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high

12R-300BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it ope

13R-300BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST5. Reconnect all leads removed from components during testing.6. Reinstall the outer case (cabine

14R-300BWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTwith the door opened (in this condition the plunger of the monitor switch is pushed in), the mete

15R-300BWc) Only one LED does not light up.d) All or some LEDs continue to light up.e) A certain group of LEDs do not light up.f) The LEDs flicker.1-2

16R-300BW2) Open the door and block it open.3) Discharge high voltage capacitor.4) Follow the troubleshooting guide given below for repair.STEPS OCCUR

17R-300BWCONTROL PANEL ASSEMBLYOUTLINE OF CONTROL PANEL5) Buzzer CircuitThe buzzer is responsive to signals from the LSI to emitaudible sounds (key to

R-300BWPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow the ove

18R-300BWDESCRIPTION OF LSILSI(IZA882DR)The I/O signal of the LSI(IZA882DR) are detailed in the following table.Pin No. Signal I/O Description1 RST IN

19R-300BWPin No. Signal I/O DescriptionON/OFF time ratio in Microcooking(a. 32second time base)MICRO ON OFFCOOK100% 32sec. 0sec.70% 24sec. 8sec.50% 18

20R-300BWSERVICINGECBECBTransistor2SB1238TransistorDTA123ESDTB123ESDTA143ESDTD143ESapprox. 1M ohm1. Precautions for Handling Electronic ComponentsThis

21R-300BWTo remove the outer case, procedure as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3. Remove the two

22R-300BWPOWER TRANSFORMER REMOVALRe-install1. Install the terminal insulator to receptacle of filamentlead (longer one) of power transformer.2. Rest

23R-300BWCONTROL PANEL ASSEMBLY REMOVALOVEN LAMP AND LAMP SOCKET REMOVAL1.Disconnect the power supply cord and remove outer case.2. Open the door and

24R-300BWSide ViewRear ViewShaftTableCenter ofbracketGapRotorBracketStatorGroove joint pliersCoilShaftAxisStatorRotorThese are the positions that shou

25R-300BWDOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT1. Disconnect the power supply cord, and then removeouter case.2.

26R-300BW9. Release door panel from seven (7) tabs of door frame bysliding door panel downward.10.Now, door panel with sealer film is free.11.Tear sea

27R-300BW645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramHIGH VOLTAGECAPACITORH.V.RECTIFIERPOWER SUPPLY CORD 120V 60HzHIGH VOLTAGE COMPONE

1R-300BWWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts

28R-300BW645123645123ABCDEFGHABCDEFGHFigure S-2. Control Panel Circuit+–+–+––+R50R4 2k 1/2wR6 4.7kVRS110G471KR7 10kR20 4.7kR30 4.7kR221001/2wR21300

29R-300BW645123645123ABCDEFGHABCDEFGHFigure S-3. Printed Wiring BoardLD1LD2LD3LD4LD5LD6LD7LD8LD9LD10LD11LD12LD13LD14LD15LD16LD18LD19LD20C61(JA)30BBEEQ

30R-300BWPARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 250V.REF. NO. PART

31R-300BWREF. NO. PART NO. DESCRIPTION Q'TY CODER62-63 VRD-B12EF104J Resistor 100k ohm 1/4W 2 AARY1 RRLY-A111DRE0 Relay (JV12S-KT) 1 ALRY2 RRLY-

2R-300BWMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiation emit

3R-300BWSHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALMICROWAVE OVENR-300BWFOREWORDThis Manual has been prepared

4R-300BW3-Pronged PlugGroundedReceptacle BoxGrounding Pin3-Pronged ReceptacleITEM DESCRIPTIONPower Requirements 120 Volts / 12 Amperes60 HertzSingle p

5R-300BWOVEN DIAGRAM1. One touch door open button.Push to open door.2. Door latches.The oven will not operate unless thedoor is securely closed.3. Rem

6R-300BWOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosing the

7R-300BWFigure O-1. Oven Schematic-Off ConditionSCHEMATICNOTE: CONDITION OF OVEN1. LIGHT UP DIAL OFF.2. DOOR CLOSED.SCHEMATICNOTE: CONDITION OF OVEN1.