Sharp Carousel R-350F Manuale di servizio - Pagina 15

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PROCEDURE

LETTER

RY1 and RY2 Relay Test

These relays are operated by D.C. voltage.

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated ............... Defective relay.

DC. voltage not indicated ......... Check diode which is connected to the relay coil. If diode is good,

RELAY SYMBOL

CARRY OUT 4R CHECKS.

PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD

(PWB) IS OPEN

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary

on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide

given below for repair.

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D CHECKS.

STEPS

NOTE: *At the time of making these repairs,

make a visual inspection of the varistor.

Check for burned damage and exam-

ine the transformer with a tester for the

presence of layer short-circuit (check

the primary coil resistance). If any ab-

normal condition is detected, replace

the defective parts.

CARRY OUT 4R CHECKS.

TEST PROCEDURES

control unit is defective.

OPERATIONAL VOLTAGE

RY1

APPROX. 24.0V D.C.

RY2

APPROX. 23.0V D.C.

OCCURRENCE

The rated AC voltage is not present between

Pin No. 1 of the 2-pin connector (A) and the

normal open terminal of the relay RY1.

The rated AC voltage is present to primary

side of low voltage transformer.

Only pattern at "a" is broken.

Pattern at "a" and "b" are broken.

COMPONENT TEST

CONNECTED COMPONENTS

Oven lamp / Turntable motor / Cooling fan motor

Power transformer

CAUSE OR CORRECTION

Check supply voltage and oven power cord.

Low voltage transformer or secondary circuit defective.

Check and repair.

*Insert jumper wire J1 and solder.

*Insert the coil RCILF2003YAZZ between "c" and "d".

R-350F

(J1)