Sharp Carousel R-980E Service-Handbuch - Seite 19

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PROCEDURE

LETTER

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

a) Buzzer does not sound or continues to sound.

b) Clock does not operate properly.

c) Cooking is not possible.

d) Proper temperature measurement is not obtained.

KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable

is making good contact, 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, disconnect the flat ribbon cable that connects the key

unit to the control unit and make sure the door sensing switch is closed (either close the door or short

the door sensing switch connector). Use the key unit matrix indicated on the control panel schematic

and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making

momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must

be replaced. If the control unit does not respond, it is 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 key pad is at fault.

G 4

G 3

G 2

G 1

RELAY TEST

Remove the outer case and check voltage between Pin No 9 of the 5-pin connector (A) and the

common terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should

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

Shut-off, Cook and Heater 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 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(COOK)

RY3(HEATER)

RY4

RY5

RY6

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.

TEST PROCEDURES

COMPONENT TEST

G 5

G 6

G 7

STOP

REHEAT

LOW MIX

PIE

CLEAR

FROZEN

FRESH

CONVEC

VEGETABLES

MULTI

HELP

COOK

180˚C

REHEAT

SENSOR

LESS

40˚C

control unit is defective.

OPERATIONAL VOLTAGE

APPROX. 21.0V D.C.

APPROX. 20.0V D.C.

APPROX. 21.0V D.C.

G 8

G 9

G10

JACKET

CLOCK

CASSEROLES

POTATO

EASY

HIGH MIX

DESSERTS

DEFROST

220˚C

230˚C

200˚C

130˚C

150˚C

70˚C

CONNECTED COMPONENTS

Oven lamp / Turntable motor

Power transformer

Heating element

Damper motor

Convection motor

Cooling fan motor

R-980E

G11

G12

INSTANT COOK

MEMORY

START

GRILL

POWER

LEVEL

250˚C

PREHEAT

160˚C