Toshiba FD-4809 Service Manual page 16

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 46 of IC4
is fed.
OK
Check Q9, 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
17 of IC2 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 and its peripheral
circuit.
NG See 3. The base and handset
be cannot be connected.
NG Check IC2 and its peripheral
circuit.
NG Check Q2 and its peripheral
circuit.
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