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TROUBLE
SHOOTING
L
f.
1.
2.
No voice signal is emitted during voice communications
of handset speaker.
Base station
YES
Is there voltage in the T901 telephone
line?
Is the switch (RY901 )
YES
Check L903. L904,
YES
"ON"?
~
CN901
I
t
YES
Does the voice signal reach secondary of T901 ?
YES
NO
Is the level of pin 19 of
NO
IC401 "Hiah"?
Check IC401.
Check T901.
%.
3. I Does the voice signal reach pin 24 of IC601 ?
I
4.
5.
6.
YES
NO
Check Q704.
I
.
I
YES
Is the level of terminal (B)
NO
Check Q905.
of Q905 "High"?
I Check Relay.
I
+
Does the voice signal reach pin 18 of IC601 ?
Is the level of pin 17 of IC601 "High"?
YES
+
YES
NO
Handset
Check IC601.
Check IC101.
1
+
Does the voice level reach pin 9 of IC351 ?
Check IC351, Q151.
YES
Does the voice level reach pin 3 of IC652?
Check IC652.
~ YES
I
~Check speaker.
-30-
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