Toshiba FT-8901A Service Manual page 18

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
IC6 is fed.
OK
Check Q12, 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 IC6 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 IC6.
NG See 3. The base and handset
cannot be connected.
NG
Check IC6.
NG Check IC2, Q3 and
their peripheral circuits.
— 20 —