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2. The bell does not ring & page does not ring.
Can the base and handset
be connected?
OK
Press handset DIAL key
while in TALK MODE.
Can key touch sound be
heard from the ring?
OK
When the PAGE SW S1 of
the base is pressed, does
pin19 of IC5 change from
high to low?
Check IC5 and its
peripheral circuit.
NG
See 3. The base and
handset cannot be
connected.
When the key of the
NG
handset is pressed, can the
pulse output at pin 58 of
IC603 be seen?
At the Q606 collector, can
the pulse wave be seen?
Check RINGER Y601.
NG
Check R40, R42 and S1.
NG
OK
NG
OK
Check IC603.
Check R627,R629,R667,
Q605,Q606, and Q613.
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