Voice Cannot Be Transmitted To Other Party (Outgoing Call) - Toshiba FT-8901A Service Manual

6. Voice cannot be transmitted to other party (outgoing call).

Can the base and handset be
connected?
OK
The 1 kHz, 9.0mV sine
waveform is applied to
MC601 + side. Check
whether there is the
1 kHz sine waveform
at Pin 20 of IC602.
OK
Check whether there is the
1 kHz sine wavefor m at
RT602.
OK
TX output signal from the
handset is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
OK
Check whether there is the
1 kHz sine waveform at Pin 9
of IC4 on the base unit.
OK
Check whether there is the
1 kHz sine waveform at Pin 3
of IC2.
OK
Check whether there is the
1 kHz sine wavefor m at
pin 6 of IC2.
OK
Check whether there is the
1 kHz sine waveform at the
Q3 collector.
OK
Check whether the 1 kHz sine
wavefor m from TEL-line
output is fed.
OK
Check MC601 of handset.
NG See 3. The base and handset
cannot be connected.
NG Check IC602 and its
peripheral circuit.
NG Check RT602 and its
peripheral circuit.
NG
Check handset RF section.
NG Check IC4 and its
peripheral circuit.
OK
NG Check RT4 and its
peripheral circuit.
NG Check IC2 and its
peripheral circuit.
NG Check IC2, Q3 and its
peripheral circuit.
NG Check T1, RL1 and their
peripheral circuits.
— 21 —
NG
Check base RF section.