Sharp R-21JCA-F Service Manual

23R-21JCATABLE OF CONTENTSPagePRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TOAVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...

8R-21JCAControl UnitControl unit consists of LSI, power source circuit, synchro-nizing signal circuit, reset circuit, buzzer circuit, encodercircuit a

9R-21JCAPin No. Signal I/O Description9RESETINAuto clear terminal.Signal is input to reset the LSI to the initial state when power is applied. Tempora

10R-21JCA1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling these parts, the

11R-21JCAMicrowave ovens contain circuitry capable of producing very high voltage and current, contact with following parts mayresult in severe, possi

12R-21JCA7. Release two (2) pins of door panel from two (2) holes ofupper and lower oven hinges by lifting up.8. Now, door sub assembly is free from o

13R-21JCAplate, referring to "ANTENNA MOTOR REMOVAL" .5. Remove the ceramic shelf from the oven cavity bottomplate.6. Remove the one (1) scr

14R-21JCA645123645123ABCDEFGHABCDEFGHFigure S-2. Control Unit CircuitINT0N.FVDDVSSXINXOUTCNVSSRESETD3D4D5D6D7P20P21P22ABCD4ICP1C2C3Q1R1 R2Q2R5 1KPOWER

15R-21JCA645123645123ABCDEFGHABCDEFGHFigure S-3. Printed Wiring BoardJP38JP39JP30JP36D71D76D78D74D70D80D72D81D77D73JP34JP31JP23JP22JP21JP5R11 RY2 RY1

16R-21JCA∆∆∆∆∆∆∆****∆*PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 250V.

17R-21JCAREF. NO. PART NO. DESCRIPTION Q'TY CODE∆∆∆∆∆4-34 PSPA-A112WRE0 Mica washer 1 AC4-35 PCUSGA378WRP0 Cushion 1 AL4-36 PCUSUA507WRP0 Cushion

24R-21JCAPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow the o

18R-21JCAOVEN AND CABINET PARTS645123645123ABCDEFGHABCDEFGH7-37-37-121-136-41-17-74-154-151-87-74-337-47-17-17-41-111-154-34-44-51-31-57-54-354-397-11

19R-21JCA645123645123ABCDEFGHABCDEFGHCONTROL PANEL PARTSDOOR PARTSMISCELLANEOUS3-2-23-33-2-13-23-13-53-53-4Actual wire harness may be different from

20R-21JCAPACKING AND ACCESSORIESINSTRUCTION BOOKTOP PAD ASSEMBLY (FPADBA385WRK0)BOTTOM PAD ASSEMBLY (FPADBA386WRK0)WRAP COVER (SSAKHA034WRE0)DOOR PRO

21R-21JCA

22R-21JCA'02 SHARP CORP. (8S0.730E) Printed in U.S.ACOPYRIGHT © 2002 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be r

1R-21JCAWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts

2R-21JCAMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiation emit

3R-21JCASHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALLIGHT DUTYCOMMERCIALMICROWAVE OVENR-21JCAFOREWORDThis Manu

4R-21JCAITEM DESCRIPTIONPower Requirements 120 Volts14 Amperes60 Hertz / Single phase, 3 wire groundedPower Output 1000 watts (IEC 705 Test Procedure)

5R-21JCASCHEMATICNOTE: CONDITION OF OVEN1. LIGHT UP DIAL OFF.2. DOOR CLOSED.Figure O-1 Oven Schematic-OFF ConditionNOTE: Indicates components with

6R-21JCATEST PROCEDURESPROCEDURELETTERCOMPONENT TESTJ RELAY TEST1-2 Other possible troubles caused by defective control unit.a) Buzzer does not sound

7R-21JCASTEPS OCCURRENCE CAUSE OR CORRECTION1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.2 Pattern at "a" an