4. Cannot make a phone call (pulse).
NGSee 3. The base and
Can the base and handsethandset cannot be
be connected?connected.
OK
NGWhile in TALK MODE,
press dial key of theCheck IC5.
handset.
Check whether square
waveform from pin 58 of
IC5 is fed.
OK
Check Q15, RL1 and their
peripheral circuits.
5. Cannot make a phone call (tone).
NGSee 3. The base and
Can the base and handsethandset be cannot be
be connected?connected.
OK
NG
While in TALK MODE,Check IC11 and
press dial key of theits peripheral circuits.
handset. Can tone
waveform from pin20 of
IC11 is fed?
OK
Can tone signal be heardNGCheck IC3, Q2 and their
from the handset speaker?peripheral circuits.
OK
Check the base TEL-line
circuit and RELAY control
circuit. |