Daewoo N230S Service Manual page 21

(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch
assembly.
11. Incomplete segments
(1) Segments missing
(2) Partical segments missing
(3) Digit flickering other than normal display slight flickering
(4) ":0" does not display when power is on.
12. A distinct change in the display are not on when they numbers is the
display.
13. One or more digits in the display are not on when they should be.
14. Display indicates a number different from one touched.
15. Specific numbers (for example 2 or 3) will not display when the panel is touched.
16. Display does not count down or up with time cooking or clock operation.
17. Oven is programable and cooks normally but no display shows.
18. Display obviously jumps in time while counting down.
19. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when cancel pad is touched.
11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are
close, replace touch control circuit.
CONDITION
Display does
not show
keyboard for the following key-
programming
at all, even if
keyboard is
touched.
NOTE
Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's,
failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B.
assembly.
CHECK
Check rach pad for
continuity of the membrane
board check procedure
M/W
RESULT
Normal
sub-assembly
Abnormal
of the membrane
20
DEF TIMER LOCK g
CAUSE REMEDY
Replace con-
Malfunction
trol box sub-
of touch
assembly
control circuit
of control box
Replace the
Malfunction
membrane
keyboard
keyboard