Toshiba FD-9839, Service Manual

Page: 19 / 64

20
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.
C h e c k w h e t h e r s q u a r e
waveform from pin 46 of IC8
is fed. Check IC8 and its peripheral
circuit.
Check R83, D11, Q11, RL1
and the peripheral circuit.
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
23 of IC2 is fed? Check IC2 and its peripheral
circuit.
OK
NG
Can tone signal be heard
from the handset speaker? Check IC3, Q3, Q4 and the
peripheral circuit. NG
OK
Check the base TEL-line
circuit and RELAY control
circuit.
NG