A
Set the handset in theNGCheck whether there is aNGCheck RT603, R641,
test mode 3, check250 Hz data waveform atR642, R643, R644,
whether deviation of the?MOD? of RF unit.R645 and C653.
TX data is app. 9.0 kHz
OK
Dev.
Check handset RF unit.
OK
Set the handset in theNGCheck whether the 250NGCheck IC601, Q601 andNG
Check handset RF unit.
test mode 6, 926.997467Hz data waveform fromtheir peripheral circuit.
MHz (250 Hz ?8 kHzpin 9 of IC601 is fed.
OK
Dev.) 1mV output signal
OK
from RF test point is
applied. Check whether
the bell ring.
Check whether there is aNGCheck RT602, Q602 and
OK
250 Hz data waveform attheir peripheral circuit.
the Q602 collector.
Place the handset on the
base to charge about 5OK
seconds, then connect
again.Check whether there is aNGCheck R628, R629,
250 Hz data waveform atIC603 and their
pin 40 of IC604.peripheral circuit.
OK
Check IC604 and its
peripheral circuit.
19 |
ACEC
