Toshiba FT-8989, Service Manual

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19
2. The bell does not ring & page does not ring.
Can the base and handset be
connected?
Press handset DIAL key
while in TALK MODE.
Can key touch sound be
heard from the ringer?
When the PAGE SW of the
base is pressed, does pin82
of IC6 change from high to
low?
Check IC4 and its peripheral
circuit.
When the key of the handset is
pressed, can the pulse output
at pin 58 of IC603 be seen?
Check RINGER Y601.
Check R178, R165 and S5.
See 3. The base and handset
cannot be connected.
Check IC603.
OK
OK
OK
NG
OK
NG
NG
NG
At the Q616 collector, can the
pulse wave be seen?
OK
Check R688, R673, R689,
R672, R629, Q616 and Q617.
NG