Toshiba FT-8509 Service Manual page 19

A
NG
Set the handset in the
test mode 3, check
whether deviation of the
TX data is app. 8 kHz
Dev.
OK
NG
Set the handset in the
test mode 6, 926.997467
MHz (250 Hz ±8 kHz
Dev.) 1mV output signal
from RF jack is applied.
Check whether the bell
ring.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
NG
Check whether there is
a 250 Hz data
waveform at C453.
OK
Check handset RF unit.
NG
Check whether the 250
Hz data waveform from
pin 9 of IC401 is fed.
OK
NG
Check whether there is
a 250Hz data waveform
at the Q402 collector.
OK
NG
Check whether there is
a 250Hz data waveform
at pin 40 of IC404.
OK
Check IC404 and its
peripheral circuit.
19
Check RT403, R441,
R442, R443, R444,
R445 and C453.
Check handset RF unit
and the peripheral
circuit of IC401.
Check RT402, Q402 and
their peripheral circuits.
Check IC403 and its
peripheral circuit.