Toshiba FT-8508, Руководство по обслуживанию

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6. TROUBLE WITH SPEAKERPHONE MODE
6-1. The voice of the caller cannot be heard (INCOMING CALL).
6-2. Voice cannot be transmitted to the calling party (OUTGOING CALL).
OK
Check IC15.
Check whether there is an
audio waveform on Pin 8
of IC15 (Line 2).
NG
OK
Check IC20.
Check whether there is an
audio waveform on Pin 14
of IC20.
NG
OK
Check W702 and SP701.
Check IC16, RL1 and Q8.
Check whether there is an
audio waveform on Pin 1
of IC16.
NG
Check MC351 and IC20.
Check whether there is an
audio waveform on Pin 23
of IC20.
NG
OK
Check IC1.
Check whether there is an
audio waveform on Pin 2
of IC1.
NG
OK
Check IC2 .
Check whether there is an
audio waveform on Pin 7
of IC2.
NG
OK
Check Q1, T1, RL1 and Q8.