Sharp R-210A Test Procedures Procedure, Letter, Component Test, Eswitch Test, HFUSE 13A

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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