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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 ringer?
OK
When the PAGE SW S1 of
the base is pressed, does
pin20 of IC2 change from
high to low?
OK
Check IC2 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 38 of
IC602 be seen?
At the Q613 collector, can
the pulse wave be seen?
Check RINGER Y601.
NG
Check R67, R104 and S1.
— 14 —
NG
OK
NG
OK
Check IC602.
Check R694, R695 and
D610.
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