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TROUBLE
SHOOTING
GUIDE
&
h.
1.
TONE MODE
No
Does the
TONE
signal reach pin (20) of IC406?
Is the signal : 3.58 MHz being emitted
to pin
~
(9) of IC406?
Does the TONE signal reach secondary
of T901 ?
Yes
No I
2.
4
Does the TONE signal reach Telephone
Line ?
..
3.
[No
I
+
Check T901, L903 and L904.
Check Q702 and Q713.
@
I
i.
L
The ringer does not ring.
Base station
+
No
Is not the position of ringer switch (S403) "OFF"
?
} Set ringer switch (S403) to the "HI" or "LO"
position.
Yes
1.
Are the handset and base station linked ?
} Refer to the section (c) and (d).
Yes
2.
No
Does the ringer signal reach pin (1) and (2) of IC903 ?
Check CN901, L903, L904, D901 and D902.
Yes
3.
+
Is
the HI I LO
signal
being
emitted
to pin (3) and (4) of
'0
IC903?
~
Check IC903.
L>
4.
I
Yes
+
No
Is the Hi / LO signal being emitted to pin (12) of IC401 ?
5.
I
I
1
I
I
Yes
Does the ringer tone signal reach pin (62) and of IC401 ?
Check IC401.
6.
7.
Yes
+
No
Does the ringer tone signal reach pin (15)
and of IC702?
) Check IC702.
1
I
Yes
+
Yes
Check speaker and speaker connector.
Handset
8.
–44–
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Table of Contents
Troubleshooting
