Sharp R-305EW Service Manual

R-305EWIn the interest of user-safety the oven should be restored to its originalcondition and only parts identical to those specified should be used.

8R-305EWDESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pulling the door. Refer to the FigureD-1.Figure D-1. Door Open

9R-305EWTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.When troubl

10R-305EWA MAGNETRON ASSEMBLY TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high

11R-305EWB 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-305EWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it ope

13R-305EWTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it ope

14R-305EWH BLOWN MONITOR FUSE TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open

15R-305EWc) When touching the pads, sometimes a pad produces no signal.If the Key unit is defective.1) Disconnect the power supply cord, and then remo

16R-305EWWARNING : The oven should be fully assembled before following procedure.(1) Place one cup of water in the center of the turntable tray in the

17R-305EWTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTTo protect the electronic circuits, this model is provided with a fine foil pattern added to the

R-305EWPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow the ove

18R-305EW3) Power Source CircuitThis circuit generates voltages necessary in the controlunit from the AC line voltage.In addition, the synchronizing s

19R-305EW11 P57 OUT Back light circuit (Light emitting diodes) driving signal.12-13 P56-P55 OUT Terminal not used.14 CNTR0 OUT Signal to sound buzzer

20R-305EW33 P27 OUT Key strobe signal.Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45terminal while one of G8 li

21R-305EW1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling these parts, the

22R-305EWTo remove the outer case, proceed as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3. Remove the two (2

23R-305EWPOWER TRANSFORMER REMOVALReinstallation1. Rest transformer on the bottom plate with its primaryterminals toward the oven face plate.2.Secure

24R-305EWCONTROL PANEL ASSEMBLY REMOVALOVEN LAMP AND LAMP SOCKET REMOVAL1.Disconnect the power supply cord and remove outer case.2. Open the door and

25R-305EWCOOLING FAN MOTOR REMOVALREMOVAL1. Disconnect the power supply cord and then removeouter case.2. Open the door and block it open.3. Discharge

26R-305EWDOOR REPLACEMENTDOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT1. Disconnect the power supply cord, and then rem

27R-305EW11.Now, door panel with sealer film is free.12.Tear sealer film from door panel.13.Now, door panel is free.14.Slide latch head upward and rem

1R-305EWWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts

28R-305EW645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramHIGH VOLTAGECAPACITORHIGH VOLTAGEWIRE BH.V.RECTIFIERPOWER SUPPLY CORD 120V 60HzHIGH

29R-305EW645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unit Circuit+–A 1C 3C 5C 4C 6C 8C 1C 7C 2A 2NOSH-ACOMCOMGNDD1S1NB10T1ACACGNDINTVRBUZZERMICRONCD

30R-305EWFigure S-3. CPU Unit Circuit645123645123ABCDEFGHABCDEFGH+–+–C-3G 9G 85 4 3 2 1 0 9 8 7 6 G 7 G 6 G 5 G 4 G 3 G 2 G 1G10G11G12G13G14C-5C-9C-4C

31R-305EWFigure S-4. Printed Wiring Board of Power Unit645123645123ABCDEFGHABCDEFGH1121137429CN - CD1(D2)(D3)SP1OMDURY2XAVHCN - ASH - BSH - ACN - BD I

32R-305EW***∆*∆**∆∆PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 250V.REF

33R-305EWHOW TO ORDER REPLACEMENT PARTSTo have your order filled promptly and correctly, please furnish the following information.1. MODEL NUMBER2. RE

34R-305EWOVEN AND CABINET PARTS645123645123ABCDEFGHABCDEFGH7-57-87-57-81-106-72-14-134-171-114-144-21-127-17-51-74-161-87-64-114-191-61-17-12-32-37-67

35R-305EWCONTROL PANEL PARTSDOOR PARTSMISCELLANEOUS645123645123ABCDEFGHABCDEFGH5-75-75-105-105-95-9Actual wire harness may be different from illustra

36R-305EWPACKING AND ACCESSORIES645123645123ABCDEFGHABCDEFGHDOOR PROTECTION SHEETSPADPA204WRE0TOP PAD ASSEMBLYFPADBA416WRKZPLASTIC BAGSSAKHA034WRE0Not

37R-305EW

2R-305EWMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiation emit

38R-305EW2001 SHARP CORP. (2S2.530E) Printed in U.S.ACOPYRIGHT © 2001 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be repro

3R-305EWSHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALMICROWAVE OVENR-305EWFOREWORDThis Manual has been prepared

4R-305EWITEM DESCRIPTIONPower Requirements 120 Volts / 13 Amperes60 HertzSingle phase, 3 wire groundedPower Output 1100 watts (IEC TEST PROCEDURE)Oper

5R-305EWcontact a qualified electrician and have it replaced with a properlygrounded three-pronged wall receptacle or have a grounding adapterproperly

6R-305EWOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosing the

7R-305EWFigure O-1. Oven Schematic-Off ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED2. CLOCK APPEARS ON DISPLAYSCHEMATICNOTE: CONDITION OF O