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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 of the
base is pressed, does pin20
of IC5 change from high to
low?
OK
Check IC5 and its peripheral
circuit.
NG
See 3. The base and handset
cannot be connected.
NG
When the key of the handset is
pressed, can the pulse output
at pin 38 of IC604 be seen?
At the Q608 collector, can the
pulse wave be seen?
Check RINGER SP601.
NG
Check R55, R77 and S1.
14
NG
OK
NG
OK
Check IC604.
Check R654, R657 and D602.
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