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TROUBLE
SHOOTING
9.
1.
2.
3.
h.
1.
2.
3.
4.
5.
6.
TONE MODE
NO
Does the TONE signal reach pin 21 of IC401 ?
~
Check IC401.
YES
Does the TONE signal reach secondaty
of T901 ?
Check Q701 and Q702.
Does the TONE signal reach Telephone Line?
Check L903, L904.
The ringer does not ring.
I Base station
I
v
Are the Handset and Base station linked?
I Check refer to the section (c) and (d).
I
1 YES
v
Does the ringer signal reach pin 1 and 2 of IC901 ?
Check CN901, L903, L904, D903, and D904.
YES
Is the High/Low signal being emitted to pin 3 and 4 of IC901 ?
Check Q901.
YES
Is the High/Low signal being emitted to pin 24 of IC401 ?
Check Q906.
I
YES
,
Handset
1
t
Is the ringer tone signal being output to pin 10 of ICOO1?
Check ICOO1.
Is the ringer tone signal being reached to terminal
(C) of
'0
Q690?
~
Check Q690.
J YES
I Check Buzzer BZ690.
I
-31-
'"44
&-
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