R-480J

 

TEST PROCEDURES

 

 

PROCEDURE

COMPONENT TEST

LETTER

 

B.Continuity check must be carried out with measuring instrument which is set to the highest resistance range.

C.A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10Mafter it has been charged.

D.A short-circuited capacitor shows continuity all the time.

E.An open capacitor constantly shows a resistance about 10 Mbecause of its internal 10Mresistance.

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

CARRY OUT 3D CHECKS.

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

Table: Terminal Connection of Switch

Plunger Operation

COM to NO

COM to NC

COM;

Common terminal

Released

Open circuit

Short circuit

NO;

Normally open terminal

Depressed

Short circuit

Open circuit

NC;

Normally close terminal

 

 

 

 

 

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

CARRY OUT 4R CHECKS.

FNOISE FILTER TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as de- scribed in the following table.

N

 

L

 

 

FUSE

 

NOISE SUPPRESSION COIL

F10A

 

 

MEASURING POINT

INDICATION OF OHMMETER

 

 

Between N and L

Open circuit

Between terminal N and WHITE

Short circuit

 

 

Between terminal L and RED

Short circuit

LINE CROSS CAPACITOR

0.068/AC250V

0.0022/AC 250V 0.0022/AC 250V

If incorrect readings are obtained, replace the noise filter unit.

WHT

RED

 

 

CARRY OUT 4R CHECKS.

 

 

GTHERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS.

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

CARRY OUT 4R CHECKS.

Table: Thermal cut-out Test

 

Temperature of "ON"

Temperature of "OFF"

Indication of ohmmeter

Parts Name

condition (closed circuit) (˚C)

condition (open circuit) (˚C)

(When room temperature

 

 

 

is approx. 20˚C)

Thermal cut-out 145˚C

This is not resetable type.

Above 145˚C

Closed circuit.

 

 

 

 

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

An open circuit thermal cut-out 145˚C (MAGNETRON) indicates that the magnetron has over- heated, this may be due to restricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out 145˚C (OVEN) indicates that the foods in the oven may catch fire, this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.

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Sharp R-480J Procedure Component Test Letter, Switch Test, Noise Filter Test Carry OUT 3D Checks, Thermal CUT-OUT Test

R-480J specifications

The Sharp R-480J is a notable microwave oven that combines advanced technology with practical design, catering to both everyday cooking needs and more complex culinary tasks. This model is designed for consumers seeking reliability and efficiency in their kitchen appliances.

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