Daewoo KOC-910K0P(AL), Service Manual, Page: 23 / 40

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CONDITION RESULT CAUSE REMEDY CHECK
Lower heater
is not heated No
continuity
Malfunction of
primary interlock
switch
Adjust or
replace
Check continuity of
primary interlock switch
No
continuity
Malfunction of
secondary interlock
switch
Adjust or
replace
Check continuity of
secondary interlock switch
No
continuity
Defective heater
Replace Check continuity of
heater
0V Replace
Approx.
24V DC
Faulty contacts
of RELAY
(RY7) or open
relay coil.
Replace
Check D.C voltage
being supplied to
RELAY(RY7) coil
Defective touch
control circuit
(TROUBLE 7)
The following visual conditions indicate a probable defective touch control Circuit or button P.C.B. assembly
1. Incomplete segments.
1) segment missing
2) partial segments missing
3) digit flickering other than normal fluorescent slight flickering
2. A distinct change in the brightness of one or more numbers exists in the display
3. One or more digits in the display are not on when they should be.
4. Display does not count down or up with time cooking or clock operation.
5. Oven is programmable and cooks normally but no display shows.
6. Display obviously jumps in time while counting down.
7. Display counts down noticeably too fast while cooking.
8. Display does not show the time of day when clear button is touched.
9. Oven lamp and turn table motor do not stop although cooking is finished.
Check if the RELAY(RY4) contacts close and if they are close, replace touch control circuit.
CONDITION RESULT CAUSE REMEDY CHECK
Display does
not show
programming
at all, even if
keyboard is
touched.
Normal
Malfunction of
touch control
circuit of control
box sub-assembly
Replace
control box
sub-assembly
Check each button for
continuity of the button
(TROUBLE 6)
Lower heater is not heated ; food will not become hot.