Toshiba FT-8259, Service Manual

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9. Trouble with speakerphone mode.
9-1. The voice of the caller cannot be heard (INCOMING CALL).
Check whether there is an
audio waveform on pin 11 of
IC8 (Line1) or pin1 of IC15
(Line2). Check IC8 (Line1) or IC15
(Line2).
Check whether there is an
audio waveform on pin 1 of
IC7.
Check IC7.
Check whether there is an
audio waveform on pin 15 of
IC17.
NG
OK
OK
9-2. Voice cannot be transmitted to the calling party (OUTGOING CALL).
Check whether there is an
audio waveform on pin 4 of
IC17.
Check MC1 and IC17.
OK
NG
Check whether there is an
audio waveform on pin 2 of
IC2 (Line1) or pin 3 of IC8
(Line2). Check IC2 (Line1) or IC8
(Line2).
OK
NG
Check whether there is an
audio waveform on pin 7 of
IC3 (Line1) or pin 1 of IC9
(Line2). Check IC3 (Line1) or IC9
(Line2). NG
OK
Check Q2, T1, RL1and Q4
(Line1) or Q10, T2, RL2 and
Q12 (Line2).
NG
Check IC7, IC8, IC17 and
their peripheral circuits.
Check FC451, W451, W452
and SP451.
OK
NG