Toshiba FT-8981 Service Manual page 18

6. Voice cannot be transmitted to other party (outgoing call).
Can the base and handset be
connected?
OK
The 1 kHz, 9.0mV sine
wavefor m i s a p p l i e d t o
MC601 + side, can the 1 kHz
sine waveform from pin 24 of
IC601 be fed?
OK
Check whether there is the
1 kHz sine wavefor m at
pin 20 of IC601.
OK
Check whether there is the
1 kHz sine wavefor m at
C669.
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 IC3 on the base unit.
OK
Check whether there is the
1 kHz sine waveform at pin 3
of IC1.
OK
Check whether there is the
1 kHz sine wavefor m at
pin 18 of IC1.
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 Q604 and its
peripheral circuit.
NG Check IC601 and its
peripheral circuit.
NG Check RT603 and its
peripheral circuit.
NG
Check handset RF unit.
NG Check IC3, Q1 and their
peripheral circuit.
OK
NG Check RT2, Q2 and their
peripheral circuits.
NG Check IC1 and its
peripheral circuit.
NG Check Q3 and its
peripheral circuit.
Check T1, RL1 and their
NG
peripheral circuits.
— 19 —
NG
Check base RF unit.