Samsung M 735 Service Manual page 16

Troubleshooting
6-1 Electrical M alfunction (Continved)
Parts Cause
1) Too small
a load
M icrow ave
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) M issing 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
M agnetron 2) Defective
thermal fan motor
cutout
sw itch 3) Too small a
OFF load or no
load
6-2
Diagnosis
If a small amount of food is heated for a long time,
period of microw ave may turn off during operation.
Check to see if the magnetron thermal cutout sw itch is
activated at a temperature higher than 150˚C.
M ake sure that qrounding of the pow er supply cord has
been done properly.
Remove the cabinet for inspection.
Check the door hinge.
Check if the screw s are secured w ell to the door hinge.
If the timer does not operate w ith 220~230V applied to the
terminals, the timer motor amy be faulty.
The lamp does not light.
Check to see if 220~230V exists at the motor terminals.
If so, motor w ill be defective.
Check if the air inlet or outlet ventilation is blocked
by the w all or other objects.
If the fan motor does not operate w ith 220~230V applied
to the terminal, the motor may be faulty.
If a small amount of food is heated repeatedly over
a long period of time, microw ave turns off during
operation.
Remedy
To increase the oven
load, add a glass of
w ater into the oven.
Replace thermal cutout
sw itch.
Rew ire.
Replace door hinges.
Fasten or tighten.
Replace timer.
Replace timer
Replace drive motor.
Keep a distance of
100mm from the
w all or the objects.
Replace fan motor.
To increase the oven
load, place a glass of
w ater into the oven.
Samsung Electronics