Daewoo KOC-9N4T7S, Service Manual

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25
CONDITION CHECK
Check each button for
continuity of the button
Malfunction of sub
pcb assembly
RESULT
Normal
CAUSE REMEDY
Replace
control box
sub-assembly
Display does
not show
programming
at all, even if
keyboard is
touched.
(TROUBLE 6)
The following visual conditions inditions 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.
CAUSE REMEDY
(TROUBLE 7)
When ERROR 2 ERROR 3 come on display.
CONDITION CHECK
Check continuity of thermistor
(resistance of thermistor)
Replace
RESULT
0 or infinite
Replace
ERROR 2 &
ERROR 3
come on
display
Check continuity of heater
(convection, upper, lower)
Defective touch
control circuit
Replace
Approx
200~300k
(room
temperature)
Defective
heater
No
continuty
continuity
Replace