9-2 Description of Operating Sequence
When the oven is set to power level of 100%, 70% or 50%
When the oven is operating under the power level of 100%, 70% or 50%, the coil of power relay 1 and 2 are
energized intermittently by ON and OFF cycle of 30 seconds in order to supply power source to the High
Voltage Transformer and thus to oscillate the magnetron.
When the oven is set to DEFROST power position
When the oven is set to DEFROST power position, the coil of power relay 1 and 2 is programmed to operate
not together but alternately. That means power relay 1 should not work when the power relay 2 does(or relay 2
should not work when the power relay 1 does). The power realy 1 is energized for 15 seconds and then the
power relay 2 is energized for 15 seconds in turn. One complete ON and OFF cycle time of the power relay 1
and 2 is 30 seconds.
The relation between indications on the display window and the output power of the microwave oven is as
shown in figure below.
LAMP
VENT
MAIN
PWR1
PWR2
PWR1
PWR2
PWR1
PWR2
100%
50%,
70%
DEF
A: DOOR OPEN, B: DOOR CLOSE, C: START, D: STOP
a(b): 50%-16sec(14sec), 70%-22sec(8sec)
A
B
C
D
A
B
1MIN
a
c
d
e
c
d
b
CM1919/CM1929
CM1619/CM1629
CM1319/CM1329
c(d):
20%
opt open-7sec(8sec)
10%
opt open-4sec(11sec)
25%
opt short-9sec(6sec)
13%
opt short-5sec(10sec)
30%
opt short-10sec(5sec)
15%
opt short-5sec(10sec)
e :
15 sec
Note : One second included as a time for starting the magnetron oscillation
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