A
Set the handset in theNGCheck whether there is aNGCheck RT403, R441,
test mode 3, check250 Hz data waveform atR442, R443, R444,
whether deviation of the?MOD? of RF unit.R445 and C453.
TX data is app. 8.5 kHz
OK
Dev.
Check handset RF unit.
OK
Set the handset in theNGCheck whether the 250NGCheck IC401, Q401 andNG
Check handset RF unit.
test mode 6, 926.997467Hz data waveform fromtheir peripheral circuit.
MHz (250 Hz ?8 kHzpin 9 of IC401 is fed.
OK
Dev.) 1mV output signal
OK
from RF test point is
applied. Check whether
the bell ring.
Check whether there is aNGCheck RT402, Q402 and
OK
250 Hz data waveform attheir peripheral circuit.
the Q402 collector.Place the handset on the
base to charge about 5OK
seconds, then connect
again.Check whether there is aNGCheck R428, R429,
250 Hz data waveform atIC403 and their
pin 40 of IC404.peripheral circuit.
OK
Check IC404 and its
peripheral circuit.
21 |
ACEC
TOSHIBA
