Sharp R-1481, R-1480, R-1482 service manual Test Procedures, Letter, Component Test, Mkey Unit Test

R-1480

R-1481

R-1482

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

7)Reconnect the power supply cord after the outer case is installed.

8)Run the oven and check all functions.

2.Control Unit.

The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure M) to determine if control unit is faulty.

2-1 In connection with pads.

a)When touching the pads, a certain group of pads do not produce a signal.

b)When touching the pads, no pads produce a signal.

2-2 In connection with indicators

a)At a certain digit, all or some segments do not light up.

b)At a certain digit, brightness is low.

c)Only one indicator does not light.

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)Clock does not operate properly.

c)Cooking is not possible.

When testing is completed,

1)Disconnect the power supply cord, and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Reconnect all leads removed from components during testing.

5)Re-install the outer case (cabinet).

6)Reconnect the power supply cord after the outer case is installed.

7)Run the oven and check all functions.

MKEY UNIT TEST

1.Disconnect the power supply cord, and then remove outer case.

2.Open the door and block it open.

3.Discharge high voltage capacitor.

4.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 connecter). 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.

5.Reconnect all leads removed from components during testing.

6.Re-install the outer case (cabinet).

7.Reconnect the power supply cord after

the outer case is installed.

G

1

G

2

G

3

G

4

G

5

G

6

G

7

G

8

8. Run the oven and check all functions.

9

BREAK

CUSTOM

1

7

2

6

WORK

FAST

HELP

LIGHT

G

SNACKS

POWER

TURN

NIGHT

&

POPCORN

TABLE

G10

REHEAT

LEVEL

8

3

ON / OFF

LIGHT

COMPU

COMPU

KITCHEN

STOP

FAN

TIMER

G11

COOK

DEFROST

9

4

CLEAR

HI / LO

CLOCK

MINUTE

0

5

START

PLUS

TOUCH ON

G12

18