Samsung CM1089 Service Manual page 24

6. Troubleshooting
6-1 Electrical Malfunction
Parts Cause
1) Too small a load
Microwave
turns off
during
2) Defective
cooking cycle .
magnetron thermal
cutout S/W
properly Incomplete
shock is felt . grounding
1) Broken door
hinges
Door doe
not operate
properly
2) Missing or loose
screw
2) Defective fan
motor
Magnetron
thermal cutout
switch OFF
3) Too small a load
or no load
Diagnosis
If a small amount of food is heated for a long
time, period of microwave may turn off during
operation .
Check to see if the magnetron thermal cutout
switch is activated at a temperature higher
than 90 ºC .
Make sure that qrounding of the power
supply cord has been done properly .
Remove the cabinet for inspection . Check
the door hinge .
Check if the screws are secured well to the
door hinge .
If the fan motor does not operate with 230V
applied to the terminal, the motor may be
faulty .
If a small amount of food is heated
repeatedly over a long period of time,
microwave turns off during operation .
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Remedy
To increase the oven
water into water into
the oven .
Replace thermal
cutout switch .
Rewire .
Replace door hinges .
Fasten or tighten .
Replace fan motor .
To increase the oven
load, place a glass of
water into the oven .