- 14 -
6-1 Electrical Malfunction(continved)
part
Cause
Diagnosis
Remedy
Microwave
turns off during
cook -ing cycle.
1) Too small
a load
If a small amount of food is heated for a long time,
period of microwave may turn off during operation.
To increase the oven
water intowater into
the oven.
2)Defective
magnetron
thermal
cutout S/W
Check to see if the magnetron thermal cutout switch
is activated at a temperature higher than 150
℃
.
Replace thermal cutout
switch.
properly
shock is
felt.
Incomplete
grounding
Make sure that qrounding of the power supply cord
has been done properly.
Rewire.
Door doe not
operate
properly
1) Broken door
hinges
Remove the cabinet for inspection. Check the door
hinge.
Replace door hinges.
2) Missing or
loose screw
Check if the screws are secured well to the door
hinge.
Fasten or tighten.
Timer does
not operate.
1) Defective
timer motor
If the timer does not operate with 21V applied to
the terminals, the timer motor amy be faulty.
Replace timer.
2) Defective
contacts of
timer S/W
The lamp does not light.
Replace timer
Cooking tray
does not
rotate.
1) Defective
drive motor
Check to see if 21V exists at the motor terminals.If
so, motor will be defective.
Replace drive motor.
1) Blocking of
the ventilatior
Check if the air inlet or outlet ventilation is blocked
by the wall or other objects.
Keep a distance of
100mm from thewall or
the objects.
Magnetron
thermal
cutout
switch
OFF
2) Defective fan
motor
If the fan motor does not operate with 230V applied
to the terminal, the motor may be faulty.
Replace fan motor.
3) Too small a
load or no
load
If a small amount of food is heated repeatedly over
a long period of time, microwave turns off during
operation.
To increase the oven
load, place a glass of
water into the oven.
