4. Cannot make a phone call (pulse).
Can the base and handsetNGSee 3. The base and handset
be connected?cannot be connected.
OK
While in TALK MODE, pressNG
Check IC5.
dial key of the handset.
Check whether square wave-
form from pin 89 (Line1) or
pin 90 (Line2) of IC14 is fed.
OK
Check Q4, RL1, R58 (Line1)
or Q12, RL2, R126 (Line2)
and their peripheral circuits.
5. Cannot make a phone call (tone).
Can the base and handset beNGSee 3. The base and handset
connected?be cannot be connected.
OK
While in TALK MODE, pressNG
Check IC5 and IC14.
dial key of the handset.
Can tone waveform from Pin
14 of IC11 is fed?
OK
Can tone signal be heardNGCheck IC4, IC2, IC3, Q2
from the handset speaker?(Line1) or IC8, IC9, Q10
(Line2) and their
OK
peripheral circuits.
Check the base TEL-line
circuit and RELAY control
circuit.
18 |
ACEC
