Toshiba FT-8809, Service Manual

Page: 16 / 48

17
4. Cannot make a phone call (pulse).
Can the base and handset
be connected? See 3. The base and handset
cannot be connected.
While in TALK MODE, press
dial key of the handset.
Check whether square
waveform from pin 22 of IC5
is fed.
Check IC5.
Check Q10, RL1 and their
peripheral circuits.
NG
OK
OK
5. Cannot make a phone call (tone).
Can the base and handset be
connected? See 3. The base and handset
be cannot be connected.
OK
NG
While in TALK MODE, press
dial key of the handset.
Can tone waveform from Pin
20 of IC8 is fed?
Check IC8.
OK
NG
Can tone signal be heard
from the handset speaker? Check IC1, Q3 and their
peripheral circuits. NG
OK
Check the base TEL-line
circuit and RELAY control
circuit.
NG