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are through inspecting and listening. On the basis of large amounts of perceptual knowledge, you can judge and
analysie the break down quickly and correctly.
5
.
1
.
1
I
N
S
P
E
C
T
I
O
N
.
5
.
1
.
1
I
N
S
P
E
C
T
I
O
N
.
Inspect whether the oven shape is disordered and where is the disordered position, If any. It is normal if the
cabinet disordered a little, but abnormal if the oven, the door disordered, the door hook broken, the door crooked,
or there are too much looseness between the door and the oven after the door is closed .
5
.
1
.
2
L
I
S
T
E
N
I
N
G
.
5
.
1
.
2
L
I
S
T
E
N
I
N
G
.
Listening to the sound of the oven operating and the noise of the fan. Minor "wen wen" noise, cycling"kala"noise
and "shishi" noise should be considered as normal. But it is abnormal if the following noises occur:
(1) Sound "wen wen " noise.
(2) Long time "shishi" noise.
(3) Strike sound like "Pipa pipa"
5
.
2
S
P
O
T
E
X
A
M
I
5
.
2
S
P
O
T
E
X
A
M
I
5
5
.
.
2
2
.
.
1
1
E
E
X
X
A
A
M
M
I
I
N
N
E
E
T
T
H
H
E
E
Measure the insulating resistance with a avometer
megaohmmeter the value should not be less than 2 megaohms.
Otherwise, part examination should be taken at once. Such as
checking whether the motor, the thermal cutout, the transformer or
the capacitor are electricity leaking.
5
.
2
.
2
E
X
A
M
I
N
A
T
I
O
5
.
2
.
2
E
X
A
M
I
N
A
T
I
O
M
M
I
I
C
C
R
R
O
O
W
W
A
A
V
V
E
E
Close the door, set the time (the oven is at operating condition but
the power plug haven't been plugged in ), measure the two feet (L -
N) of the power plug with R×1 grade of an avometer, the resistance
value should be about 2.5 ohm. If open circuit occurs, then you must
check whether the 8A fuse is broken the primary winding of the transformer is open circuit the thermal cutout is
open circuit or not, you must check whether the interlock device is put through or all the plugs are connected well.
If short circuit occurred or the resistance less than 1.5 ohms, you
should check whether the primary winding of the power transformer
is short – circuited or part short – circuited.
5
.
2
.
3
E
X
A
M
I
N
A
T
I
O
5
.
2
.
3
E
X
A
M
I
N
A
T
I
O
Measure the microwave leakage with a microwave leakage
measure. Place a graduate of 275ml water at the middle of the
glass tray of the oven (FIG.5 - 1). Close the door, power set
high, time set to 3 minutes, press the starting button to operate
the oven. After rectified the microwave leakage measure,
measure around the door crack, those hole position of the
window and the air vent at four sides of the oven with the probe
of the measure. When measure, the moving speed of the probe
should not exceed 25mm per second, and the measuring
direction should be the same with the outing direction of the
probe should not exceed 25mm per second, and the measuring
direction should be the same with the outing direction of the microwave leakage (FIG.5 - 2)..
When measuring the ultimate value of microwave leakage of all the measure position should not exceed 1
milliwatt/cm2, of should be considered as abnormal.
5
.
2
.
4
E
X
A
M
I
N
E
W
H
5
.
2
.
4
E
X
A
M
I
N
E
W
H
N
I
N
G
S
T
E
P
S
O
F
T
H
E
N
I
N
G
S
T
E
P
S
O
F
T
H
E
M
M
I
I
C
C
R
R
O
O
W
W
A
A
V
V
E
E
I
I
N
N
S
S
U
U
L
L
A
A
N
O
F
T
H
E
R
E
S
I
S
T
A
N
O
F
T
H
E
R
E
S
I
S
T
A
O
O
V
V
E
E
N
N
.
.
N
O
F
M
I
C
R
O
W
A
V
E
L
E
N
O
F
M
I
C
R
O
W
A
V
E
L
E
E
N
T
H
E
O
V
E
N
A
T
O
P
E
E
N
T
H
E
O
V
E
N
A
T
O
P
E
M
I
C
R
O
W
A
V
E
O
V
E
M
I
C
R
O
W
A
V
E
O
V
E
T
T
I
I
N
N
G
G
R
R
E
E
S
S
I
I
S
S
T
T
A
A
N
N
C
C
E
E
or
N
C
E
V
A
L
U
E
O
F
T
H
N
C
E
V
A
L
U
E
O
F
T
H
A
K
A
G
E
.
A
K
A
G
E
.
R
A
T
I
N
G
,
B
U
T
T
H
E
F
O
O
R
A
T
I
N
G
,
B
U
T
T
H
E
F
O
O
16
N
N
a
glass tray
E
E
Fig.5-3
D
C
A
N
'
T
B
E
H
E
A
T
E
D
.
D
C
A
N
'
T
B
E
H
E
A
T
E
D
.
Fig.5-1
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