Toshiba FT-8509 Service Manual page 17

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 14 of IC10 change from
to low?
OK
Check IC10 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 IC404 be
seen?
OK
At the Q408 collector, can
the pulse wave be seen?
OK
Check RINGER Y401.
NG
Check Keyboard Rubber.
17
NG
Check IC404.
NG
Check R454, R457, R456,
Q408, Q409 and D402.