R-334 (serv.man4). Complete - Sharp Home Appliance Service Manual (repair manual). Page 12

R-334 - 12

PROBLEM

Home fuse blows when power cord is plugged
into wall outlet.

Fuse F8A blows when the door is opened.
F8A fuse blows when power supply cord is
plugged into wall outlet.
“88:88” does not appear in display when power
cord is plugged into wall outlet.
Display does not operate properly when STOP
pad is touched.
Oven lamp does not light when door is opened.
(Display appears.)

Oven does not start when START pad is touched.
(Display appears.)

Oven lamp does not light. (Display appears.)

Fan motor does not operate. (Display appears.)
Turntable motor assembly does not operate.
(Display appears.)
Oven or any electrical parts do not stop when
cooking time is 0 or STOP pad is touched.
Oven seems to be operating but little or no heat is
produced in oven load. (Microwave power level is
set at ”HIGH”)
Oven does not operate properly during the variable
cooking condition except ”HIGH” cooking condition.
(Oven stops when STOP pad is touched.)
Oven goes into cook cycle but shuts down before
end of cooking cycle.

Oven stops as soon as the START pad is touched.

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

TEST PROCEDURE

CONDITION

OFF
CONDITION

COOKING
CONDITION

A

B

C

D

E

E

E

F

G

H

K

M

A
G
N

E
T
R

O
N

M

O
N

I

T

O
R

E

D

L

A

T
C

H

S

W

I

T
C

H

H
V

.

C
A

P

A
C

I

T

O
R

H
V

.

R
E
C
T

I

F

I

E
R

A

S
S
E

M

B
L
Y

P

O

W

E
R

T
R

A
N

S
F

O
R

M

E
R

F

A
N

M

O

T

O
R

N
O

I

S
E

F

I

L
T
E
R

F

U

S
E

F
8

A

T

H

E
R

M

A

L

C
U
T

|

O
U

T

1
2
5

C

S
T

O

P

S

W

I

T
C

H

M

O
N

I

T

O
R

S

W

I

T
C

H