Transmission Signal; No Voice Signal Emitted During Voice Communications Of Handset Speaker - Sanyo CLA-1380 Service Manual

TROUBLE SHOOTING GUIDE
e.
Transmission signal
Handset
1.
2.
3.
.&
4.
5.
6.
L ,
f.
1.
No
Does the transmission signal reach pin (B) Q651 ?
Check mic and D651.
Yes
+
No
Does the transmission signal reach pin (16) IC651 ?
) Check IC351 and Q651.
Yes
No
Does the transmission signal reach pin (13) IC651 ?
IS the level of pin (11) of IC651 "High" ?
1
Yes Yes No
4
Base station
*&
Yes
+
No
Does the transmission signal reach pin (17) IC301 ?
b Check IC 301.
Yes
&
No
Does the transmission signal reach pin (6) IC602?
b Is the level of pin (16) of IC602 "High" ?
Yes
Check IC602.
Check IC401.
,
+
No
Does the transmission signal reach pin (9) IC701 ? Is the level of pin (6) of IC701 "High" ?
Yes Yes
No
+
Does the transmission signal reach telephone line side of
T901 ?
=-
I
No
Check T901 and Q702, Q713.
No voice signal is emitted during voice communications of handset speaker.
Base station
+
No
Is there voltage in the T901 telephone line ?
) Is the switch (RY901 ) "ON" ?
,
Yes Yes No
+4iw
4
6
Check CN901, R901, R908, 3
L903, L904 and C916.
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