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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 INTCOM key of
the base is pressed, does
pin 29 of IC14 change from
low to high?
OK
Check IC14 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 58 of IC603 be seen?
At the Q605 collector, can the
pulse wave be seen?
Check RINGER Y601.
NG
Check key rubber.
15
NG
OK
NG
OK
Check IC603.
Check R688, R627 and
D604.
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