SOI 03.06 FV
17/38
599 36 78-45
TROUBLESHOOTING CHART
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the
checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given
a procedure letter which will be found in the “Test Procedure” section.
IMPORTANT: If the oven becomes inoperative because of a blown fuse F2. Check the monitored latch
switch and monitor switch before replacing the F8A fuse.
TEST PROCEDURE
A
B C
D E
E E
F
F
G H I J J K K L M N O
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
CONDITION
PROBLEM
MAGN
ET
R
O
N
HIGH VOLTA
G
E T
R
A
N
SFO
R
MER
H.V. RECT
IFIE
R A
SSY
H.V. HARNE
SS
HIGH VOLTA
G
E
CAPACITO
R
M
O
NIT
O
RE
D
LAT
C
H SW
IT
C
H
STOP SW
ITCH
MON
ITOR SWI
T
CH
MAG THER
MAL
CU
T-OU
T 125
°C
TH
ER
MAL
CU
T-OU
T 125
°C
(OVEN
)
FU
SE F1
FU
SE F2
N
O
IS
E FI
LT
ER
TU
RN
TABLE MOT
O
R
FAN
MOTOR
TC
T
R
AN
SFOR
MER
CO
NT
R
O
L U
N
IT
SWI
T
CH
UNI
T
RELAY
RY1
,3,4
GRILL HEATING
ELEMENT
FOI
L
PATTERN
ON
P.
W
.B.
POWER S
U
PPLY
CO
RD
SHO
R
TE
D
W
IRE HA
RNESS
OPENED WIRE
HARNESS
OVEN LAMP
BLOCK
E
D VE
NTIL
ATIO
N O
PENINGS
WRO
N
G OPE
R
ATION
MIS-A
D
JUSTME
NT OF SW
ITCHES
HOME
FUSE
O
R
B
R
EAKE
R
NO
POWE
R
AT W
A
LL
O
U
TLET
BLOKE
D
CO
OLING
FA
N
Home fuse blows when power cord is
plugged into wall outlet.
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●
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"88:88"does not operate in display
when power cord is plugged into wall
outlet.
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Display does not operate properly
when STOP button is touched.
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Oven lamp does not light, when door
is opened. (Display operates).
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OFF
CONDITION
Oven does not start when START
button is touched.(Display operates).
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Fan motor does not operate (Oven
lamp lights).
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Turntable motor assembly does not
operate (Oven lamp lights).
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Oven or electrical parts does not stop
when timer knob is at "0" or STOP
button is touched.
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Display operates properly but all
electrical parts do not operate.
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Oven goes into cook cycle but shuts
down before end of cooking cycle.
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Oven seems to be operating but little
or no heat is produced in oven load
(Microwave power control is set at
HIGH).
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Oven does not seem to be operating
properly during variable cooking
condition(Oven operates properly at
HIGH).
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Grill heating element does not heat
(oven seems to be operate ting)
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COOKING
CONDITION
Fuse F8A blows (F2)
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