circuit is closed, so the control board can function now. When cooking, touch the starting switch to power the
timer and the power relay. RY1, RY2 closed the power supply to the anode of the magnetron and the filament,
changing the power frequency electric energy to microwave energy, the microwave energy then transferred to the
heating chamber for food heating. At the same time, the lamp turned on, the fan motor begins to cool the
magnetron. The turntable motor set off to drive the food around and making the food heated evenly. The
microcomputer begins reckon the time, when it reached the sets time, power relay are cut off, the power of the
lamp, all the motor and the magnetron are cut off, the food – heating process ended. If heating need go on, just
push down the starting button and closed the door, the oven will continue its working. When something wrong
with the fan motor or the air vent was blocked that breakdown the cooling system, the magnetron temperature
would rise high very quickly. The PC board is cut off to prevent the magnetron from being damaged by
overheating. When the thermal cutout is cut off, the magnetron, motors and the lamp would stop working
simultaneously. Moreover, the thermal cutout has the self - resuming character, when the temperature lowered, it
will resume to close condition.
4
4
H
H
O
O
W
W
T
T
O
O
A
A
S
S
S
S
E
E
M
M
B
B
L
L
E
E
A
A
N
N
D
D
D
D
I
I
S
S
A
A
S
S
S
S
E
E
M
M
B
B
L
L
E
E
M
M
I
I
C
C
R
R
O
O
W
W
A
A
V
V
E
E
O
O
V
V
E
E
N
N
C
C
O
O
M
M
P
P
O
O
N
N
E
E
N
N
T
T
S
S
In the following pages, we will introduce the ways in which the various parts of a typical microwave oven can be
disassembled and assembled.
4
4
.
.
1
1
T
T
H
H
E
E
C
C
A
A
B
B
I
I
N
N
E
E
T
T
1.
2.
3.
To disassemble the cabinet
Pull out the power plug.
Loosen the four screws at the back of the oven with a “+”- screwdriver. (FIG.4-1a)
Push the cabinet back 25mm according to the arrow direction shown at FIG.4-1 (b), and the cabinet can be taken
off.
To assemble the cabinet
Put the cabinet on the oven, and push it full ahead.
Check whether the up, right and left troughs have been inserted with the curved with the curved rim of the
oven (FIG.4-1 (b)). If the cabinet and the oven are not tallied exactly, then it should be reassembled or those
untallied parts should be smoothed.
(a)
Tighten those four screws, please make sure that one of the screws should have a plum blossom shape
washer to keep a good earth.
9
