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(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch
assembly.
1
1. 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.
1
2. A distinct changes in the display are not on when they should be.
1
3. One or more digits in the display are not on when they should be.
1
4. Display indicates a number different from one touched.
1
5. Specific numbers (for example 2 or 3) will not display when the but-
ton is touched.
1
6. Display does not count down or up with time cooking or clock operation.
1
7. Oven is programable and cooks normally but no display shows.
1
8. Display obviously jumps in time while counting down.
1
9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when cancel button 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.
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.
CONDITION
CHECK
Check rach pad for
continuity of the membrane
keyboard for the following key-
board check procedure
Malfunction
of touch
control circuit
of control box
sub-assembly
RESULT
Normal
CAUSE
REMEDY
Replace con-
trol box sub-
assembly
Malfunction
of the membrane
keyboard
Abnormal
Replace the
membrane
keyboard
Display does
not show
programming
at all, even if
keyboard is
touched.
