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Press the "3" key, check
whether deviation of the
TX data is app. ±35 kHz Dev.
OK
Press the "6" key, and apply
926.207269 MHz
(250 Hz ±35 kHz Dev.) 1mV
output signal from RF jack.
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
250Hz data waveform at
C717.
Check handset RF unit
(B850).
NG
Check whether the 250 Hz
data wareform from pin 28
of IC601.
Check whether there is a
250 Hz data waveform at
pin 24 of IC601.
Check whether there is a
250 Hz data waveform at
pin 40 of IC602.
Check IC602 and its
peripheral circuit.
— 16 —
NG
OK
NG
OK
NG
OK
NG
OK
Check RT603, R626, R672,
R673, R679, R680 and
C642.
Check handset RF unit and
the peripheral circuit of
IC601.
Check R614, R703, C631,
C632 and their peripheral
circuits.
Check R616, R663 and
their peripheral circuits.
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