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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 pin67
of IC4 change from high to
low?
OK
Check IC4 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 Y601.
NG
Check DSP unit.
— 15 —
NG
OK
NG
OK
Check IC604.
Check R654, R656, R657,
Q609, Q608 and D602.
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