Press the "3" key, checkNGNGCheck RT603, R626, R672,
Check whether there is a
whether deviation of the250Hz data waveform atR673, R679, R680 and
TX data is app. ?35 kHz Dev.C717.C642.
OK
OK
Check handset RF unit
(B850).
NGNG
Press the "6" key, and applyCheck whether the 250 HzCheck handset RF unit and
926.207269 MHzdata wareform from pin 28the peripheral circuit of
(250 Hz ?35 kHz Dev.) 1mVof IC601.IC601.
output signal from RF jack.
Check whether the bell ring.OK
OK
NG
Check whether there is aCheck R614, R703, C631,
250 Hz data waveform atC632 and their peripheral
Place the handset on the
pin 24 of IC601.circuits.
base to charge about
5 seconds, then connectOK
again.
NG
Check whether there is aCheck R616, R663 and
250 Hz data waveform attheir peripheral circuits.
pin 40 of IC602.
OK
Check IC602 and its
peripheral circuit.
? 16 ? |
ACEC
