Toshiba FD-4809, Service Manual

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14
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 pin63
of IC4 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 2 of IC606 be seen?
Check RINGER Y601.
Check R105 and S1.
See 3. The base and handset
cannot be connected.
Check IC606.
OK
OK
OK
NG
OK
NG
NG
NG
At the Q609 collector, can the
pulse wave be seen?
OK
Check R667 and Q609.
NG