Sharp R-210A specifications Switch Test, Temperature Fuse or Thermal CUT-OUT Test, Fuse 13A

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R-210A

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

F.When the internal wire is opened in the high voltage capacitor shows an infinite resistance.

G.The resistance across all the terminals and the chassis must be infinite when the capacitor is normal.

If incorrect reading are obtained, the high voltage capacitor must be replaced.

CARRY OUT 4R CHECKS.

ESWITCH TEST

Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.

CARRY OUT 3D CHECKS.

Table: Terminal Connection of Switch

Plunger Operation

COM to NO

COM to NC

Released

O.C.

S.C.

Depressed

S.C.

O.C.

 

 

 

COM; Common terminal,

NO;

Normally open terminal

NC;

Normally close terminal

S.C.;

Short circuit

O.C.;

Open circuit

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT 4R CHECKS.

FTEMPERATURE FUSE OR THERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the thermal cut-out or temperature fuse. Then using an ohmmeter, make a continuity test across the two terminals as described in the below.

CARRY OUT 4R CHECKS.

Table: Temperature Fuse or Thermal Cut-out Test

 

Temperature of "ON"

Temperature of "OFF"

Indication of ohmmeter

Parts Name

condition (closed circuit).

condition (open circuit).

(When room temperature is approx. 20˚C.)

 

 

 

 

Temp. fuse 120˚C

This is not resetable type.

Above 120˚C

Closed circuit

 

 

 

 

Thermal cut-out 95˚C

Below 75˚C

Above 95˚C

Closed circuit.

 

 

 

 

If incorrect readings are obtained, replace the temperature fuse or thermal cut-out.

An open circuit thermal cut-out (MG) indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure.

An open circuit temperature fuse (OVEN) indicates that the food in the oven cavity may catch fire, this may be due to overheating produced by improper setting of the cooking time or failure of the control panel.

GMOTOR WINDING TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.

Table: Resistance of Motor

Motors

Resistance

Fan motor

Approximately 60 Ω

 

Turntable motor

Approximately 3.4 kΩ

 

 

 

 

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R CHECKS.

HFUSE 13A

CARRY OUT 3D CHECKS.

If the fuse 13A is blown when the door is opened, check the 1st latch switch, 2nd latch switch, monitor switch and monitor resistor.

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Contents Model R-210A Table of Contents210A Microwave Oven Sharp Corporation OSAKA, Japan210A General Important InformationThis Appliance Must be Earthed SpecificationMedium LOW/ Defrost Control Panel Appearance ViewOFF Condition Operation SequenceMicrowave Cooking Condition Medium HIGH, MEDIUM, Medium LOW, LOW CookingFunction of Important Components Servicing Troubleshooting GuideRemember to Check 3D Remember to Check 4RTest Procedure Possible Cause Defective Parts Troubleshooting ChartProblem C D E E E F F I I I G G HJ KMicrowave Output Power IEC Test Procedures Letter Component Test Magnetron TestMicrowave Output Power 2 Litre water load Test Procedures Component Test LetterΔT1 Power Transformer Test Test Procedures Letter Component TestCarry OUT 4R Checks High Voltage Rectifier Test Carry OUT 3D ChecksTemperature Fuse or Thermal CUT-OUT Test Switch TestMotor Winding Test Carry OUT 3D Checks Fuse 13ATimer SWITCH- Contacts Timer Motor with VARI-SWITCH TestTimer Motor Noise Filter Test Carry OUT 3D ChecksPower Transformer Removal Component Replacement and Adjustment ProcedureOuter Case Removal To prevent an electric shock, take the followingPositive Lock Connector Removal Magnetron ReplacementRe-install Oven Lamp Socket RemovalTurntable Motor Replacement Power Supply Cord ReplacementFAN Motor Replacement RemovalInstallation Control Panel Assembly and Switch Lever RemovalControl Panel Assembly and Switch LE- VER Removal Rear ViewAfter adjustment, make sure of the following Door ReplacementRE-INSTALL Sealer Film InstallationMicrowave Measurement Preparation for TestingRequirement Holaday HI Simpson 380MOven Schematic-OFF Condition Oven Schematic-ON ConditionHigh Voltage Components Figure S-1. Pictorial DiagramCabinet Parts Electric PartsControl Panel Parts Oven PartsSCREWS,NUTS and Washers Packing and AccessoriesInterchangeability↔ Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous 210A

R-210A specifications

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