Samsung G639C Service Manual page 16

Troubleshooting
6-1 Electrical Malfunction (Continved)
Parts Cause
1) Too small
a load
Microwave
turns off
during cook- 2) Defective
ing cycle. magnetron
thermal
cutout S/W
Electric Incomplete
shock is qrounding
felt.
Door does 1) Broken door
not operate hinges
properly
2) Missing or
loose screw
1) Defective
Timer does timer motor
not operate.
2) Defective
contacts
of timer S/W
Cooking tray 1) Defective
does not drive motor
rotate.
1) Blocking of
the ventilatior
Magnetron 2) Defective
thermal fan motor
cutout
switch 3) Too small a
OFF load or no
load
Samsung Electronics
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 150˚C.
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 timer does not operate with 230V applied to the
terminals, the timer motor amy be faulty.
The lamp does not light.
Check to see if 230V exists at the motor terminals.
If so, motor will be defective.
Check if the air inlet or outlet ventilation is blocked
by the wall or other objects.
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.
Remedy
To increase the oven
load, add a glass of
water into the oven.
Replace thermal cutout
switch.
Rewire.
Replace door hinges.
Fasten or tighten.
Replace timer.
Replace timer
Replace drive motor.
Keep a distance of
100mm from the
wall or the objects.
Replace fan motor.
To increase the oven
load, place a glass of
water into the oven.
6-2