Toshiba FT-8989 Service Manual page 21

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 23 of IC6
is fed.
OK
Check Q6, 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
20 of IC7 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
be cannot be connected.
NG
Check IC7.
NG Check IC4, Q3 and their
peripheral circuits.
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