Trouble Shooting Guide - Daewoo KOG-371G0S Service Manual

TROUBLE SHOOTING GUIDE

TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1) Check earthing 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 tranformer, disconnect one load 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
Check continuty of interlock
monitor switch with door closed
(COM NC)
Check continuity of both
primary and secondary
interlock switch with door
colosed
Check continuity of primary
interlock switch contact with door
partially open until interlock
monitor switch contact close
(COM NC)
Check continuity of primary
winding of low voltage
transformer
Disconnect high voltage fuse
and operate the unit
RESULT
Continuity
No Continuity
No Continuity
Continuity
Continuity
0Ω or infinite
Approx.
150~310
(normal)
Fuse again
blows
45 45
CAUSE
Malfunction of
interlock
monitor switch
Malfunction of
interlock switch
Shorted contacts
of primary
interlock switch.
Defective low
voltage
transformer
Defective high
voltage
transformer
REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace