Filter
Top Products
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.
Check whether square
waveform from pin 13 of
IC11 is fed.
Check IC11.
Check Q17, 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
1 of IC11 is fed?
Check IC11.
OK
NG
Can tone signal be heard
from the handset speaker?
Check IC4, Q3 and their
peripheral circuits.
NG
OK
Check the base TEL-line
circuit and RELAY control
circuit.
NG