Toshiba FT-8981 Service Manual page 17

4. Cannot make a phone call (pulse).
Can the base and handset
be connected?
OK
While in TALK MODE, press
dial key of the handset.
Check whether square
waveform from pin 80 of
IC4 is fed.
OK
Check Q21, RL1 and their
peripheral circuits.
5. Cannot make a phone call (tone).
Can the base and handset be
connected?
OK
While in TALK MODE, press
dial key of the handset.
Can tone waveform from Pin
36 of IC4 is fed?
OK
Can tone signal be heard
from the handset speaker?
OK
Check the base TEL-line
circuit and RELAY control
circuit.
NG
See 3. The base and handset
cannot be connected.
NG
Check IC4.
NG See 3. The base and handset
cannot be connected.
NG
Check IC4.
NG Check Q13, IC1, Q3 and
their peripheral circuits.
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