Sharp R-21JCA-F service manual Fm Am, Figure O-1 Oven Schematic-OFF Condition

Page 9

SCHEMATIC

NOTE: CONDITION OF OVEN

1.LIGHT UP DIAL OFF.

2.DOOR CLOSED.

NOTE: Indicates components with potential above 250 V.

R-21JCA-F

NOISE FILTER

L
FUSE 20A
AC120V		LINE BYPASSLINE BYPASS CAPACITORCAPACITOR 0.003300F / AC 125V0.003300 F / AC 125V
60 Hz
LINE CROSSCAPACITORAC250V0.22F	NOISESUPPRESSIONCOIL

THERMAL	THERMAL
CUT-OUT	CUT-OUT
125˚C (OVEN)	145˚C (MAG.)
A5
	RY1	PRIMARY INTERLOCK RELAY
	CONTROL UNIT
A3	A1
	DOOR SENSING	OL
	SWITCH

RY2

COOK RELAY	SWITCH
	MONITOR

FM AM

POWER

TRANSFORMER

CAPACITOR 0.94 µF 2400V

RECTIFIER

MAGNETRON

N

SCHEMATIC

NOTE: CONDITION OF OVEN

1.DOOR CLOSED.

2.LIGHT UP DIAL ON.

NOISE FILTER

OVEN	FAN	ANTENNA
LAMP	MOTOR	MOTOR

SECONDARY

INTERLOCK SWITCH

Figure O-1 Oven Schematic-OFF Condition

THERMAL	THERMAL
CUT-OUT	CUT-OUT
125˚C (OVEN)	145˚C (MAG.)

AC120V 60 Hz

L

FUSE 20A

LINE CROSS CAPACITOR 0.22 F AC250V

N

NOISE SUPPRESSION COIL

			A5
LINE BYPASS	CAPACITOR	0.003300 F / AC 125V		RY1	PRIMARY INTERLOCK	RELAY	RY2	COOK RELAY		SWITCH
				CONTROL UNIT						MONITOR
			A3	A1						MONITOR
LINEBYPASS		0.003300F / AC 125V	A3	A1
LINEBYPASS	CAPACITOR	0.003300F / AC 125V		DOOR SENSING	OL			FM		AM
				SWITCH
				OVEN			FAN		ANTENNA
				LAMP			MOTOR		MOTOR
				SECONDARY
				INTERLOCK SWITCH

POWER

TRANSFORMER

CAPACITOR

0.94 µF

2400V

RECTIFIER

MAGNETRON

Figure O-2 Oven Schematic-Microwave cooking Condition

7

Image 9

Contents Model R-21JCA-F Before Servicing Dont Touch Before Servicing When the testing is completedMicrowave Measurement Procedure RequirementsLeakage test Sharp Electronics Corporation Light Duty Commercial Microwave Oven 21JCA-F ForewordGeneral Information SpecificationMaximum width, depth and height Actual capacity for holding food is less10 6 Oven DiagramDescription of Operating Sequence OperationOFF Condition Cooking ConditionFM AM Figure O-1 Oven Schematic-OFF ConditionDescription and Function of Components Troubleshooting Guide Test Procedure Possible Case Defective PartsProblem Power Transformer Test Microwave Output PowerHigh Voltage Capacitor Test Thermal CUT-OUT Test 125˚C OvenThermal CUT-OUT Test 145˚C Magnetron Monitor Switch Test Door Sensing SwitchPrimary Interlock System Test Primary Interlock Relay RY1Control Panel Assembly Test Before testingNoise Filter Test Relay Test Test Procedures Letter Component TestSteps Occurrence Cause or Correction Description of LSI Touch Control Panel AssemblyPower source voltage Pin No Signal Description Auto clear terminalInternal clock oscillation frequency input setting Power source voltage +5VTouch Control Panel Servicing Other PrecautionsServicing of Touch Control Panel Servicing ToolsUsing lead-free wire solder Precautions for Using LEAD-FREE SolderEmploying lead-free solder SolderingComponent Replacement and Adjustment Procedure Power Transformer RemovalOuter Case Removal Control Panel Assembly Removal Magnetron RemovalOven Lamp and Lamp Socket Removal Antenna Motor Removal Positive Lock Connector NO-CASE Type RemovalCooling FAN Motor Removal Rear ViewPower Supply Cord Replacement Re-installRemoval Door Parts Removal Antenna Motor Shaft Replacement After any service, make sure of the followingRemoval Figure C-10. Stirrer Antenna Assembly Installation Installation of Ceramic ShelfHighvoltagecomponents PictorialDiagramCN-A3 Pin5mm Pitch Figure S-3. Printed Wiring Board Electric Parts Parts ListCabinet Parts Control Panel PartsDoor Parts HOW to Order Replacement PartsMiscellaneous SCREWS,NUTS and WashersOven and Cabinet Parts Control Panel Parts Copyright 2005 by Sharp Corporation ALL Rights Reserved Packing and Accessories