Variable power cooking control
The coil of power relay A and B are energized intermittently by
the digital programmer circuit, when the oven is set to MEDIUM
or DEFROST power position. The digital programmer circuit
controls the ON-OFF time of the power relay A and B contacts
Unlike many other appliances, the microwave oven is high
voltage, high current equipment. Though it is free from danger
in ordinary use, extreme care should be taken during repair.
CAUTION
Servicemen should remove their watches whenever working close to
or replacing the magnetron.
8.1. Check the earthing
Do not operate on a 2 wire extension cord. The microwave
oven is designed to be used in a completely earthed condition.
It is imperative, therefore, to make sure it is properly earthed
before beginning repair work.
in order to vary the output power of the microwave oven. One
complete ON and OFF cycle of the power relay is 44 seconds.
The relation between indications on the control panel and the
output power of the microwave oven is as shown in Figure.
8.2. If the door lock, the door
switch, the door seal or the
door develops a malfunction,
be sure not to operate the
oven until complete repairs
are made.
If the oven is operated with any of these parts in imperfect
condition, hazardous microwave leakage might occur.
WARNING
Never operate the oven until the following are confirmed:
1. The door is tightly closed.
2. There is no broken hinge or door arm.
3. The door seal is not damaged.
4. The door is not bent or warped.
5. There is no other visible damage.
7 DESCRIPTION OF OPERATING SEQUENCE
8 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
14
NE-2156 / NE-2146 / NE-1656
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