Advertisement
NE-9970, NE-9970C
NE-9870,
NE-9870C
REASON: During first 1~5 minutes, magnetron is oscillates but the fan motor does not rotate, this causing the magnetron to heat up and
open the magnetron thermal cutout.
;
WARNING
A high voltage is generated in the secondary winding of the high voltage transformer and also high voltage circuit,
even though fan motor does not rotate. Be very cautious for high voltage when troubleshooting.
CHECK
RESULT
CAUSE
.
REMEDY
A
Faulty contacts of power relay
Replace power relay D
Approx. 18V DC
:
Ae
Check DC voltage being ap-
[rome toroe |
Deepens
ac
(on the mini PCB)
plied to power relay D coil
(NOTE 4)
Defective DPC
Replace
NOTE 4: When checking DC voltage, check between coil terminals of power relay D with door opened.
REASON: During first 1~5 minutes, magnetron is oscillates but the fan motor does not rotate, this causing the magnetron to heat up and
open the magnetron thermal cutout.
WARNING
A high voltage is generated in the secondary winding of the high voltage transformer and also high voltage circuit,
even though fan motor does not rotate. Be very cautious for high voltage when troubleshooting.
Check continuity of power re-
lay C contacts
{TROUBLE 8] Oven lamp, fan motor and turntable motor turn on when door is opened. (NE-9970, NE-987) only)
Shorted contacts of latch
Check continuity of latch
switch A
Continuity
Advertisement
