Sharp R-21HC Service Manual

R-21HCIn the interest of user-safety the oven should be restored to its originalcondition and only parts identical to those specified should be used.W

R-21HC8DESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by grasping the door handle, refer toFigure D-1.When the door handl

R-21HC9TROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.When trouble

R-21HC10B POWER TRANSFORMER TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high v

R-21HC11TEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open

R-21HC12TEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open

R-21HC13H BLOWN MONITOR FUSE TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open t

R-21HC14TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTJ RELAY TESTb) At a certain LED, brightness is low.c) Only one LED does not light up.d) All or som

R-21HC152) Open the door and block it open.3) Discharge high voltage capacitor.4) Follow the troubleshooting guide given below for repair.STEPS OCCURR

R-21HC16DESCRIPTION OF LSILSI(IZA902DR)The I/O signal of the LSI(IZA902DR) are detailed in the following table.Pin No. Signal I/O DescriptionControl U

R-21HC179 S0 OUT Digit selection signal.Signal is input to the anodes of the light-emitting diodes (LD1 - LD5).10 S1 OUT Digit selection signal.Signal

R-21HCPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow the oven

R-21HC181. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling these parts, the f

R-21HC19To 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 five (5

R-21HC20POWER TRANSFORMER REMOVAL6. Disconnect the main wire harness from the powertransformer.7. Remove the two (2) screws holding the transformer t

R-21HC21COOLING FAN MOTOR REMOVALPOSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVALFigure C-2. Positive lock® connector1. Disconnect the power supply c

R-21HC224. Install the fan blade to the shaft of fan motor by pushingthe fan blade with a small, light weight, ball peen hammeror rubber mallet.CAUTIO

R-21HC23CHOKE COVER1. Disconnect the power supply cord.2. Open the door slightly.3. Insert a putty knife (thickness of about 0.5mm) into thegap betwee

R-21HC24Figure C-6. Door Disassembly7. Release two (2) pins of door panel from two (2) holes ofupper and lower oven hinges by lifting up.8. Now, door

R-21HC251. Disconnect the power supply cord.2. Open the door and block it open.3. Make sure that the smooth surface of the ceramic shelfface up.4. Mak

R-21HC26645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramORGGRYTHERMAL CUT-OUT125˚C(OVEN)OVEN LAMP & SOCKETTHERMALCUT-OUT145°C(MAG.)F

R-21HC27645123645123ABCDEFGHABCDEFGHFigure S-2. Control Panel Circuit+–+–+–+–A 5A 3A 1COMNOCOMNONOFUSE1C2 2.2µ/160VAC R10 100k 1/2w R63 4.7k SW1LD16D8

R-21HC1WARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts

R-21HC28645123645123ABCDEFGHABCDEFGHFigure S-3. Printed Wiring BoardLD4LD3LD2LD1D70D71D72D78D79D80D81SW1ABCD75D76D77D84D83D82D85R70R71R72R73R7412345EE

R-21HC29***∆*PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 250V.REF. NO.

R-21HC30∆∆∆∆∆∆∆∆∆∆∆REF. NO. PART NO. DESCRIPTION Q'TY CODER71 VRD-B12EF331J Resistor 330 ohm 1/4W 1 AAR72 VRD-B12EF241J Resistor 24

R-21HC31HOW TO ORDER REPLACEMENT PARTSTo have your order filled promptly and correctly, please furnish the following information.1. MODEL NUMBER 2. RE

R-21HC32645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS7-37-37-121-136-41-17-74-154-151-84-197-74-337-47-17-17-41-111-154-34-44-51-31-57-54-357-117

R-21HC33645123645123ABCDEFGHABCDEFGHCONTROL PANEL PARTSDOOR PARTSMISCELLANEOUSActual wire harness may be different from illustration.5-55-105-65-175-

R-21HC34'98 SHARP CORP. (7S2.530E) Printed in U.S.ACOPYRIGHT © 1998 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be re

R-21HC2MICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitt

R-21HC3SHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALLIGHT DUTYCOMMERCIALMICROWAVE OVENR-21HCFOREWORDThis Manual

R-21HC43-Pronged PlugGroundedReceptacle BoxGrounding Pin3-Pronged ReceptacleITEM DESCRIPTIONPower Requirements 120 Volts14 Amperes60 Hertz / Single ph

R-21HC5OVEN DIAGRAM1. Back splash cover2. Side splash cover3. Oven light4. Ceramic shelf5. Control panel6. Cavity face plate7. Door latch openings8. D

R-21HC6OPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosing the d

R-21HC7SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. LIGHT UP DIAL ON.Figure O-2 Oven Schematic-Microwave cooking ConditionSCHEMATICNOTE: CONDITIO