Daewoo KOC-1C0KB, Service Manual, Page: 33 / 40

32
1. Check points
CHECK RESULT CAUSE AND REMEDY
Trouble2) Although display shows, No microwave oscillation or the oven does not start cooking
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
No
Check contact of door hook to
primary interlock switch, monitor
switch and DOM switch
Fault contacts
Modify location of door and
door hook or replace door
assembly
Yes Check
Check continuity of monitor
switch and DOM switch
No continuity
Replace switch which
causes a problem
No
No
No
No
No
Yes
Check insertion of DOM terminal
to PCB No
insertion Replace
high voltage fuse
Yes
Check continuity of high voltage
fuse No
continuity Replace
high voltage fuse
Yes
Check the resistance of H.V.
transformer
Resistance of
H.V. transformer
is higher or lower
than the standard
Replace H.V. transformer
Yes
Check continuity of M/W RELAY
No
continuity
Replace Control Assembly
Yes
Check the problems of
magnetron
Resistance of
magnetron is lower
than the standard
or Insulation is
defected
Replace magnetron