Daewoo KOR-868G7S, Service Manual

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17
(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.
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.
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.
CONDITION CHECK
Check continuity of interlock
monitor switch with door closed
Malfunction of
interlock moni-
tor switch
Malfunction of
interlock switch
Shorted con-
tacts of primary
interlock switch.
RESULT
Continuity
No Continuity
CAUSE REMEDY
Replace
Fuse blows.
Replace No Continuity
Continuity
Defective low
voltage trans-
former
0
Ω
or infinite
Approx.
1160
Ω
(normal)
Replace
Check continuity of primary
winding of low voltage trans-
former
Defective low
voltage trans-
former
Fuse again
blows
Replace
Disconnect high voltage fuse
and operate the unit
Continuity Replace
Check continuity of primary inter-
lock switch contact with door
partially open until interlock mon-
itor switch contact close
(COM
↔
NO)
Check continuity of both primary
and secondary interlock switch
with door colosed