Service manual

24
(TROUBLE 4) The following visual conditions indicate a profective touch control circuit or membrane switch assembly.
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 they numbers is 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.
5. Specific numbers (for example 2 or 3) will not display when the panel is touched.
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 clear 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.
TROUBLE SHOOTING GUIDE
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.
NOTE
CONDITION
CHECK RESULT CAUSE REMEDY
Display does
not sho
w
programming
at all, even if
keyboard is
touched.
Norma
l
Replac
e
control box
sub-assembly
Replace th
e
membrane
Keyboard
Malfunction
of touch
control circuit
of control box
sub-assembly
Abnorma
l
Check each pad for
continuity of the
membrane keyboard
for the following
keyboard check
procedur
e
Malfunction o
f
the membrane
keyboard