Trouble Shooting Guide - Daewoo KOG-37BG0S Service Manual

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 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 hamess, 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 continuty of interlock
monitor switch with door closed
(COM
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
Check continuity of primary
winding of low voltage
transformer
Disconnect high voltage fuse
and operate the unit
CHECK
NC)
NC)
RESULT
Malfunction of
Continuity
interlock
monitor switch
No Continuity
No Continuity
Malfunction of
interlock switch
Continuity
Continuity
Shorted contacts
of primary
interlock switch.
0Ω or infinite
Defective low
voltage
Approx.
transformer
150~310
(normal)
Defective high
Fuse again
voltage
blows
transformer
18
CAUSE REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace