TOSHIBA FT8259 Repair Manual

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