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(TROUBLE4) The following visual conditions indicate a probable defective touche 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 brightness of one or more numbers 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.
5. For exemple, touch 5 and 3 appears in the display.
6. Specific numbers (for exemple 2 or 3) will not display when the panel is touched.
7. Display does not count down or up with time cooking or clock operation.
8. Oven is programmable and cooks normally but no display shows.
9. Display obviously jumps in time while counting down.
10.Display counts down noticeably too fast while cooking.
11.Display can not shift from the first stage cooking to the third stage cooking while 3 phase cooking (including
defrost).
12.Display does not show the time of day when clear pad is touched.
13.Oven lamp, fan motor 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.
(TROUBLE5) Digital readout display does not show programming, even if the membrane keyboard is programmed by
touching proper pads.
CONDITION
Display does
not show
programming
at all, even if
keyboard
is touched.
NOTE
Before following the particular steps listed above in the troubleshooting guide for the membrane keyboard' s, fail-
ure, 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
CAUSE
Normal
Malfunction of
touch control
circuit of control
box sub-assembly
Malfunction of
Abnormal
the membrane
keyboard
25
TROUBLESHOOTING GUIDE
REMEDY
Replace control box
sub-assembly
Replace the
membrane keyboard
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