Daewoo KOC-1C0KB Service Manual page 33

Trouble2) Although display shows, No microwave oscillation or the oven does not start cooking
1. Check points
CHECK
Check contact of door hook to
primary interlock switch, monitor
switch and DOM switch
Check continuity of monitor
switch and DOM switch
Check insertion of DOM terminal
to PCB
Check continuity of high voltage
fuse
Check the problems of
magnetron
Check the resistance of H.V.
transformer
Check continuity of M/W RELAY
2. Check points after repair
- After repair or replacement of parts, operate the oven in Microwave mode.
- Operate M/W mode using a cup of water about 300ml and check the water grow warm.
- You need to reconfirm the above guidances in trouble again.
Yes
Fault contacts
No
Yes
No continuity
No
Yes
No
insertion
No
Yes
No
continuity
No
Yes
Resistance of
magnetron is lower
than the standard
or Insulation is
defected
No
Yes
Resistance of
H.V. transformer
is higher or lower
than the standard
No
Yes
No
continuity
RESULT
Modify location of door and
door hook or replace door
assembly
Check
Replace switch which
causes a problem
Replace
high voltage fuse
Replace
high voltage fuse
Replace magnetron
Replace H.V. transformer
Replace Control Assembly
32
CAUSE AND REMEDY