Trouble Shooting Guide; Troubleshooting - Daewoo N230S Service Manual

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.
(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.
CONDITION
Fuse blows.
Check continuity of interlock
monitor switch with door closed
Check continuity of both primary
and secondary interlock switch
with door colosed
Check continuity of primary inter-
lock switch contact with door
partially open until interlock mon-
itor switch contact close
(COM
Check continuity of primary
winding of low voltage trans-
former
Disconnect high voltage fuse
and operate the unit
CHECK
NO)
RESULT
Malfunction of
Continuity
interlock moni-
tor switch
No Continuity
No Continuity
Malfunction of
interlock switch
Continuity
Continuity
Shorted con-
tacts of primary
interlock switch.
0Ω or infinite
Defective low
voltage trans-
Approx.
former
150~310
(normal)
Fuse again
Defective low
blows
voltage trans-
former
17
CAUSE REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace