Daewoo KOR-131G0A, Service Manual

Page: 22 / 49

21
TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1) Check grounding before trouble checking.
2) Be careful of the high voltage circuit.
3) Discharge the high voltage capacitor.
4) When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts
and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.
CHECK RESULT CAUSE REMEDY
Fuse blows.
Continuity
No Continuity
Continuity
0 infinite
Ω
or
Approx.
150~310
(normal)
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace
Check continuity of
primary winding of low
voltage transformer
Malfunction
of interlock
monitor
switch
Defective low
voltage
transformer
Check continuity of
interlock monitor switch
with door closed
Replace fuse
Check continuity of primary
interlock switch contact
with door partially open
until interlock monitor switch
contact close
Shorted contacts
of primary
interlock switch.
Fuse again
blows
Disconnect one side of the
lead wire connected form
high voltage transformer
to the high voltage capacitor
and operate the unit
Normal
Defective high
voltage capacitor
Defective high
voltage transformer
Replace
CONDITION
NOTE
When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below.