Daewoo KOC-972T0S, Service Manual

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TROUBLE SHOOTING GUIDE
(TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly.
1. Incomplete segments
(1) Segments missing
(2) Partial segments missing
(3) Digit flickering other than normal fluorescent slight flickering
(4) 0 does not display when power is on.
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 indicates a number different from one touched.
(for example, even if one touched 5, 3 appears in the display.
5. Specific numbers (for example, 2 or 3) do not display
when the button is touched.
6. Display does not count down or up with time cooking or
clock operation.
7. Oven is programable and cooks normally but no display shows.
8. Display obviously jumps in time while counting down.
9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when clear button is touched.
11. Oven lamp and turntable motor do not stop although cooking is finished.
Check if the RELAY (RY3) contacts close and if they are close, replace touch control circuit.
B efore follow ing the particular steps listed above in the trouble shooting guide for the button keyboard’s failure,
please check for the continuity of each w ire-harness betw een the button keyboard and P.C .B . assem bly.
NOTE
CON DITION
CHECK RESULT CAUSE REM EDY
D isplay does
not show
program m ing
at all, even if
keyboard is
touched.
N orm al
R eplace
control box
sub-a ssem bly
R eplace
the button
keyboard
M alfunction
of touch
control circuit
of control box
sub-a ssem bly
N orm al
C heck eac h button for
continuity of the button
keyboard for the
following k eyboard
check procedure
M alfunction
of botton
keyboard