Sharp R771M-006 Handmatig - Pagina 8

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TEST PROCEDURES

PROCEDURE

LETTER

RELAY TEST

CARRY OUT 3D CHECKS.

Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 4 pin connector (A) on

the control unit with an A.C. voltmeter.

The meter should indicate 230-240 volts, if not check oven circuit.

Relay Test

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

convection cooking operation or grill 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 input circuit

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 these repairs, make a

CARRY OUT 4R CHECKS.

control unit is defective.

OPERATIONAL VOLTAGE

RY1

Approx. 24.0V D.C.

RY2

Approx. 18.0V D.C.

RY3

Approx. 18.0V D.C.

RY4

Approx. 18.0V D.C.

RY5

Approx. 24.0V D.C.

OCCURANCE

The rated AC voltage is not present at

Power terminal of CPU connector (CN-A).

The rated AC voltage is present at primary

side of low voltage transformer.

Only pattern at "a" is broken.

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

visual inspection of the varistor for burn-

ing damage and examine the trans-

former with tester for the presence of

layer short circuit (check primary coil

resistance).

If any abnormal condition is detected,

replace the defective parts.

771M -

COMPONENT TEST

CONNECTED COMPONENTS

Oven lamp / Turntable motor

High voltage transformer

Grill heating element (Top grill)

Bottom heating element

Fan motor

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.

(CARRY OUT 3D CHECKS BEFORE REPAIR)

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

(CARRY OUT 3D CHECKS BEFORE REPAIR)

(J1)