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NE-9970, NE-9970C
NE-9870, NE-9870C
TROUBLESHOOTING GUIDE
4. Check grounding before checking for trouble.
2. Be careful of the high voltage circuit.
3. Discharge high voltage capacitor. (See page 23)
4. When checking the continuity of the switches or the high voltage sanctonwer disconnect one lead wire ean these
_ parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or dam-
age to your meter.
5. Do not touch any parts of the circuitry on the digital programmer circuit since static electric discharge may dam-
age this control panel.
Always touch yourself to ground while working on this panel to discharge any static charge in your body.
First of all operate the microwave oven following the correct operating procedures described on pages 4 ~ 13 in order to find the exact cause of any trouble.
(TROUBLE 1] The following visual conditions indicate a probable defective di ital r
membrane key board (membrane switch assembly).
en
progenne: Cleve
Eee
A. In case of following conditions, D.P.C. is defective.
12. Display does not stop counting down with time cooking even
1. Incomplete segments.
when Stop/Reset Pad is tapped.
(A) Segments missing.
13. Time of day does not reappear when cooking is finished.
(B) Partial segments missing.
(C) Digit flickering other than normal fluorescent slight flickering.
(D) Colon does not turn on or does not blink when the clock pad is
tapped.
. Adistinct change in the brightness of one or more numbers in the
colgsh
Meee
ete
te
AUTO
WEIGHT
DEF
FROZ . COOK
COMB
ne or more
digits in
the display not on when
they shouid be.
. Display counts down noticeably too fast while cooking.
. Display cannot shift from the first stage cooking to the second
stage cooking even though Two Stage Cooking is programmed.
ADOON
ONEBW
WH
=—
et
Fig. 43
1. Clock set cannot be
_
seer _|
at all.
Defective membrane switch
2. Some inputs cannot be programmed.
Some pads have no continuity
Random programming when pressing other than touch pads or without pressing any at ail. (intermittently)
Check continuity of membrane
switch (between terminals 6
and 9) with clock pad tapped
Check continuity of membrane
switch (refer to page 27 for the
test procedures of membrane
switch)
Replace membrane switch
and recheck
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