Toshiba FT-8009, Руководство по обслуживанию

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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 pin20
of IC5 change from high to
low?
Check IC5 and its peripheral
circuit.
When the key of the handset is
pressed, can the pulse output
at pin 38 of IC404 be seen?
Check RINGER Y401.
Check R55, R77 and S1.
See 3. The base and handset
cannot be connected.
Check IC404.
OK
OK
OK
NG
OK
NG
NG
NG
At the Q408 collector, can the
pulse wave be seen?
OK
Check R454, R457 and D402.
NG