Sharp R-90GC Service Manual

R-90GCIn the interest of user-safety the oven should be restored to its originalcondition and only parts identical to those specified should be used.W

8R-90GCFigure O-1. Oven Schematic-OFF ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. CLOCK APPEARS ON DISPLAY.SCHEMATIC DIAGRAMtime. And t

9R-90GCFigure O-2. Oven Schematic-Microwave Cooking ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. COOKING TIME PROGRAMMED.3. “START” PAD

10R-90GCSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. GRILL PAD TOUCHED.3. COOKING TIME PROGRAMMED.4. “START” PAD TOUCHED.Figure O-4. Oven Schemat

11R-90GCsecondary interlock switch contacts fail to open, themonitor fuse blows simultaneously with closing of themonitor switch contacts. CAUTION: BE

12R-90GCopen at 302˚F (150˚C) causing the oven to shut down. Whenthe thermal cut-out has cooled, the thermal cut-out closes at266˚F (130˚C).TOP HEATIN

13R-90GCTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.When troubl

14R-90GCHome fuse blows when power cord is plugged into wall receptacle.Monitor fuse blows when power cord is plugged into wall receptacle88:88 does n

15R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord.2. Remove the outer case cabinet, referring to “OUTER CASE CAB

16R-90GCC HIGH VOLTAGE RECTIFIER TEST1. Disconnect the power supply cord.2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.3

17R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTG MONITOR SWITCH1. Disconnect the power supply cord, and then remove outer case.2. Open the door a

R-90GCPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLE EXPO-SURE TO EXCESSIVE MICROWAVE ENERGY(a) Do not operate or allow the o

18R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTI BLOWN FUSE F10A1. Disconnect the power supply cord.2. Remove the outer case cabinet, referring t

19R-90GC1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Make

20R-90GCQ DAMPER SWITCH TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST3. Open the oven door and block it open.4. Discharge the high voltage capacito

21R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open

22R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTIn this service manual, troubleshooting by unit replacement is described according to the symptoms

23R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTX SOLID-STATE RELAY TESTSolid-state relay21431. Disconnect the power supply and then remove outer

24R-90GCTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTarrows. And touch the number pad 5. And then touch the start pad.(3) The oven is in Compu Defrost

25R-90GCThe touch control section consists of the following unitsas shown in the touch control panel circuit.(1) Tact switch circuit on the CPU unit.(

26R-90GCABCH: GNDL0.1 sec2.0 sec1.0 sec1.0 secDuring cookingLH16.7 msec.5 AN1 OUT Tact switch strobe signal. ... Signal appli

27R-90GCPin No. Signal I/O DescriptionONOFFDuringcookingLGNDH.ONOFFDuringcookingLGNDH.(Convection)26 P76 OUT Magnetron high-voltage circuit drivingsig

1R-90GCWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts

28R-90GCECBTOUCH CONTROL PANEL SERVICING(1) Servicing the touch control panel with power supplyof the oven:CAUTION:THE HIGH VOLTAGE TRANSFORMER OF THE

29R-90GCpanel while keeping it apart from the oven proper; in thiscase you must short both ends of the door sensing switch(on PWB) of the touch contro

30R-90GC1. Disconnect the power supply cord.2. Open the oven door and block it open.3. Remove the two (2) special screws from the lowerportion of the

31R-90GCPOWER TRANSFORMER REMOVALPLATE REMOVAL”.6. Disconnect the main wire harness from the powertransformer.7. Disconnect the high voltage wire and

32R-90GC1. Disconnect the power supply cord.2. Remove the outer case cabinet, referring to “OUTERCASE CABINET REMOVAL”.3. Open the oven door and block

33R-90GC1. Disconnect the power supply cord.2. Remove the outer case cabinet, referring to “OUTERCASE CABINET REMOVAL”.3. Open the oven door and block

34R-90GC1. Disconnect the power supply cord.2. Wait for 60 seconds to discharge the high voltagecapacitor.3. Remove the turntable tray and the turntab

35R-90GC3. Open the oven door and block it open.4. Discharge the high voltage capacitor.5. Disconnect the wire leads from the switch.6. Remove the one

36R-90GC5. Close the door.6. Remove the two (2) door springs from the door cam right,oven hinge right, door com left and oven hinge left.7. Release th

37R-90GCCHOKE COVER8. Insert a putty knife (thickness of about 0.5 mm) into thegap between the choke cover and the door panelassembly as shown in Figu

2R-90GCMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitt

38R-90GC645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramTURNTABLE MOTORTOUCH CONTROLTRANSFORMERCONVECTIONMOTORCAPACITORRY1BLKGRNREDDAMPER MOT

39R-90GC645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unitl CircuitA-8A-6A-3C-1C-2C-3C-4NOCOMD-9E-3B-2B-1E-1D5A-1D-3D-5E-5A-4G-3G-4G-5B-3B-4A-2H-6G-1B

40R-90GC645123645123ABCDEFGHABCDEFGHFigure S-3. CPU Unit CircuitAN5AN4AN3AN2AN1AN0AN15AN14AN13AN12AN11AN10AN9AN8P83P82P81P80CNVssRESETVSSXinXoutVCCP77

41R-90GC645123645123ABCDEFGHABCDEFGHFigure S-4. Grid Assignment of Fluoresent Display Tube1a1G2a3a1a2aS1 S2 S3 S4 S5 S6 S7 S8 S93a1a2a3a1a2a3a1a2a3a1a

42R-90GC645123645123ABCDEFGHABCDEFGHFigure S-5. Printed Wiring Board of CPU UnitJP63JP45C2JP51JP65JP60JP53JP47JP50JP49JP48JP44JP43JP42JP29JP33JP32JP27

43R-90GCPARTS LIST****∆*Note: The parts marked "∆" may cause undue microwave exposure.The parts marked "*" are used in voltage mor

44R-90GCREF. NO. PART NO. DESCRIPTION Q'TY CODERY6 RRLY-A112DRE0 Relay (VE-24HE-K) 1 AHSP1 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AGVRS1 RH-VZA032DRE0

45R-90GCREF. NO. PART NO. DESCRIPTION Q'TY CODE4-16 FFANMA015WRKZ Convection fan assembly 1 AQ4-17 LANGFA223WRPZ Convection motor mounting angle

46R-90GCREF. NO. PART NO. DESCRIPTION Q'TY CODEHOW TO ORDER REPLACEMENT PARTSTo have your order filled promptly and correctly, please furnish the

47R-90GC645123645123ABCDEFGHABCDEFGH7-87-96-142-44-57-211-14-74-64-14-564-364-597-121-84-607-124-604-404-611-117-51-167-121-127-127-17-124-477-47-41-1

3R-90GCPRODUCT DESCRIPTIONGENERAL INFORMATIONOPERATIONTROUBLESHOOTING GUIDEAND TEST PROCEDURETOUCH CONTROL PANELCOMPONENT REPLACEMENT ANDADJUSTMENT PR

48R-90GC645123645123ABCDEFGHABCDEFGHCONTROL PANEL PARTSDOOR PARTS3-3-13-3-23-43-53-2-1C3-63-73-83-33-73-23-3-3x7x73-7x83-73-7x73-2-1D5-45-45-25-85-95-

49R-90GC645123645123ABCDEFGHABCDEFGHMISCELLANEOUSPACKING AND ACCESSORIES6-4 TURNTABLE TRAY6-6 COOK BOOK6-7 INSTRUCTION BOOK6-8 RECIPE SHEET6-3 TURNTAB

R-90GCCOPYRIGHT © 2002 BY SHARPCORPORATIONALL RIGHTS RESERVED.No part of this publication may be reproduced,stored in retrieval systems, or transmitte

4R-90GCSPECIFICATIONITEM DESCRIPTIONPower Requirements 240 Volts7.5 Amperes (Microwave) / 13.0 Amperes (Convection)/ 13.5 Amperes (Speed Cooking)60 H

5R-90GCExtension CordIf it is necessary to use an extension cord, use only a 3-wire extension cord that has a3-blade grounding plug and a 3-slot recep

6R-90GCOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosing the d

7R-90GCmotor and convection motor are turned on.2. The coil of relay (RY4) is energized by the control unit.The damper is moved to the closed position