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(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit
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.
2. A distinct change in the display are not on when the numbers are
displayed.
3. One or more digits in the display are not on when they should be.
4. Display indicates a number different from one pressed.
5. Specific numbers (for example 2 or 3) will not display when the panel is pressed.
6. Display does not count down or up with time cooking or clock operation.
7. Oven is programmable 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 the STOP/CLEAR button is pushed. (in case of setting the present time)
11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 3 contacts close.
If they close, replace P.C.B assembly.
CONDITION
Display does
not show
programming
at all, even if
keyboard is
pressed.
NOTE
Before following the particular steps listed above in the troubleshooting guide for the failure of membrane
keyboard, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B.
assembly.
CHECK
Check each pad for
continuity of the membrane
keyboard for the following
keyboard check procedure
RESULT
Normal
Abnormal
of the membrane
20
CAUSE
REMEDY
Malfunction
Replace the
of the control
control circuit
circuit board
board
Malfunction
Replace the
membrane
keyboard
keyboard
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