Daewoo KOR-6Q1B3A, Service Manual

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(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.
TROUBLESHOOTING 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
( COM NC )
Check continuity of
both primary and secondary inter-
lock switch with door closed
Malfunction of
Interlock
monitor switch
Malfunction of
interlock switch
RESULT
Continuity
No continuity
CAUSE REMEDY
Replace
(NOTE)
(NOTE)
(COM NC)
Fuse blows.
Replace
Shorted contacts
of primary inter-
lock Switch
Continuity
Replace
Check continuity of
primary interlock switch contact with
door partially open until interlock
monitor switch contact close
( COM NC close )
Defective low
voltage trans-
former
Defective
high voltage
transformer
0 or infinite Replace
Replace
Check continuity of
primary winding of low voltage
transformer
Disconnect high voltage
fuse and operate the unit
No
Continuity
Continuity
Approx.
150~310
( normal )
Fuse again
blows
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