6.3.9
Abnormal Speaker
*
See Item
5.2.9
"Speaker Operation Test".
(1)
When the speaker doesn't operate:
Test using the operation program.
a)
If the signal in figure is transmitted to U18
(P31). exchange the speaker.
b)
If
the signal in U18
(P3
I) stays low, exchange the
CPU
board.
(2)
\!'hen the speaker doesn't stop the operation:
a) Exchange
the
CPU
board.
6.3.1
0
Abnormal Keyboard
*
See Item
5.2.10
"Keyboard Operation Test".
I
Abnormal Symptom
I
Though only one key
is
pushed, more
than
two
characters are displayed.
(
1) The cause is chattering of key board. so exchange the key board.
Abnormal
bymptom
Nothing is displayed on the
LCD.
(1) If specific character is not displayed, the key-switch is bad. Exchange the
key-switch.
(2)
If all characters are not displayed. exchange the
CPU
board.
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