Sharp Carousel R-3S56 Manuel d'entretien - Page 14

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R-3S56

PROCEDURE

LETTER

d) The corresponding segments of all digits do not light up or they continue to light up.

e) Wrong figure appears.

f) A certain group of indicators do not light up.

g) The figure of all digits flicker.

2-3 Other possible problems caused by defective control unit.

a) Buzzer does not sound or continues to sound.

b) Cooking is not possible.

TACT SWITCH TEST

If the display fails to clear when the STOP/CLEAR tact switch is depressed, first verify that the door

sensing switch(stop switch) operates properly; that is the contacts are closed when the door is closed

and open when the door is open. If the door sensing switch(stop switch) is good, make sure the door

sensing switch is closed (either close the door or short the door sensing switch connecter). Use the tact

switch matrix indicated on the control panel schematic and place a jumper wire between the pins that

correspond to the STOP/CLEAR tact switch making mo-

mentary contact. If the control unit responds by clearing

with a beep, the tact switch is faulty and must be replaced.

If the control unit does not respond, it is a faulty and must

be replaced. If a specific pad does not respond, the above

method may be used (after clearing the control unit) to

determine if the control unit or tact switch is at fault.

RELAY TEST

CARRY OUT 3D CHECKS.

Remove the outer case and check voltage between Pin Nos. 3 and 5 of the 3 pin connector (A) on the

control unit with an A.C. voltmeter.

The meter should indicate 220 volts, if not check oven circuit.

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 or convection 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

RY1

RY2

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.

TEST PROCEDURES (CONT'D)

COMPONENT TEST

OPERATIONAL

VOLTAGE

Approx. 19.0V.D.C.

Oven lamp/Turntable motor/Cooling fan motor

Approx. 18.0V.D.C.

Power transformer

SW1

SW2

MIN.

SW5

SW4

START/

AUTO COOK

INSTANT COOK

SW7

SERVES/

POWER LEVEL

CONNECTED COMPONENTS

SW3

SEC.

SW6

STOP

CLEAR