Toshiba FT-8009, Руководство по обслуживанию

Страница: 15 / 45

16
A
Check handset RF unit.
Set the handset in the
test mode 3, check
whether deviation of the
TX data is app. 8 kHz
Dev. NG Check whether there is a
250 Hz data waveform at
“MOD” of RF unit. Check RT403, R441,
R442, R443, R444,
R445 and C453. NG
OK
Check handset RF unit.
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. NG Check whether the 250
Hz data waveform from
pin 9 of IC401 is fed. Check IC401, Q401 and
their peripheral circuit. NG
OK
OK
Check whether there is a
250 Hz data waveform at
the Q402 collector. Check RT402, Q402 and
their peripheral circuit. NG
OK
Check whether there is a
250 Hz data waveform at
pin 40 of IC404. Check R428, R429,
IC403 and their
peripheral circuit. NG
OK
Check IC404 and its
peripheral circuit.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
OK