Daewoo KOC-972T0S, Service Manual

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TROUBLE SHOOTING GUIDE
Following the procedures below to check if the oven is defective or not.
1. Check grounding before checking trouble.
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 then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
(TROUBLE 1) Oven does not operate at all; any inputs can not be accepted.
W hen electric parts are checked, be sure the pow er cord is not inserted into the w all outlet.
C heck w ire harness, w iring, and connected of the term inals and pow er cord before check parts listed below.
NOTE
CON DITION CHECK RESULT CAUSE REM EDY
F use b low s.
C ontinuity
(C O M NC )
(C O M NC )
N o C ontinuity
N o
C ontinuity
C ontinuity
C ontinuity
0 infinite
Ω
or
A pprox.
150~210
(norm al)
F use a gain
blows
R eplace
N O T E 1
R eplace
N O T E 1
R eplace
N O T E 1
R eplace
R eplace
C heck continuity of
interlock m onitor sw itch
w ith door closed
(C O M NC )
C heck continuity of both
prim ary and secondary
interlock sw itch w ith
door closed
C heck continuity of
prim ary w inding of low
voltage transform er
D isconnec t high voltage
fuse and operate the unit
C heck continuity of
prim ary interlock sw itch
contact with door
partially open until
interlock m onitor sw itch
contact clos e
(C O M NC close)
M alfunction
of interlock
m onitor
sw itch
M alfunction
of interlock
sw itch
S horted
contacts of
prim ary
interlock
sw itch
D efective low
voltage
transfo rm er
D efective
high voltage
transfo rm er