Haier EA-1770EG Service Manual page 23

abnormal ,replaced it. If normal, Replace the fuse ,cut off the connection wire between the
transformer and the high-voltage capacitor ,then start the oven .If normal, the AK rectifier ,is
bad, replace it.
2.
Check the conduction of the thermostat1and thermostat2,if wrong, replace it.
Trouble 4After start, The oven keeps running and, can't stop.
1. Cut off the connecting wire of the microwave relay and check the conduction .If always in
conduction ,The control panel has trouble ,replace it.
2. Check the conduction of the timer motor ,If abnormal ,the timer motor has trouble ,replace
it .If normal, Check the timer knob, find interfere with the control panel frame ,that is
because the knob is blocked and can't rotate, adjust it.
Trouble5After a period in baking ,the power is switch off.
Check the thermostat 3,If always in conduction during baking ,because the thermostat is
bad, replace it .If normal, check the thermostat 2,it is off, that is because the protective
thermostat has misoperation. Remind the user to pay attention to the environment of the
oven.
Trouble 6:After starting, the noise of the oven is too large.
Dismantle the shell to see
1. if the fan bumps other parts ,The fan rotates with high speed, and cause the loose parts
vibrate and make noises.
2. The electromagnetic field attracts the shell to vibrate and bump other parts to make noises.
Increase the thickness of the sponge strip or shock-resistance rubber to avoid the vibration
of the shell.
Attention: The working sound of the microwave oven contains two parts:
1. The fan rotates with high speed (near 3000 r.p.m.). The fin rubs the air and
makes rubbing noises.
2. The high-voltage transformer will output 2000V high-voltage during work,
and produce a strong magnetic field. It will attract the shell to vibrate slightly
and make some noises.
The fuse is not broken
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Maintenance Service and Trouble Shooting