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19
A
Check handset RF unit.
Set the handset in the
test mode 3, check
whether deviation of the
TX data is app. 9.0 kHz
Dev.
NG Check whether there is a
250 Hz data waveform at
“MOD” of RF unit.
Check RT603, R641,
R642, R643, R644,
R645 and C653.
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 test point is
applied. Check whether
the bell ring.
NG
Check whether the 250
Hz data waveform from
pin 9 of IC601 is fed.
Check IC601, Q601 and
their peripheral circuit.
NG
OK
OK
Check whether there is a
250 Hz data waveform at
the Q602 collector.
Check RT602, Q602 and
their peripheral circuit.
NG
OK
Check whether there is a
250 Hz data waveform at
pin 40 of IC604.
Check R628, R629,
IC603 and their
peripheral circuit.
NG
OK
Check IC604 and its
peripheral circuit.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
OK