A
Press ?3? key, checkNGCheck whether there is aNGCheck R635, R636,
whether deviation of the250 Hz data waveform atR634, R632, R619,
TX data is app. 8 kHzC669.C610, C669 and RT603.
Dev.OK
Check handset RF unit.
OK
Press ?6? key,NGCheck whether the 250NGCheck handset RF unit
926.997467 MHz (250Hz data waveform from and the peripheral circuit
Hz ?8 kHz Dev.) 1mVpin 9 of IC606 is fed. of IC606.
output signal from RFOK
jack is applied. Check
whether the bell ring.
OK
Check whether there is aNGCheck RT602, Q601 and
250 Hz data waveform attheir peripheral circuit.Place the handset on the
the Q601 collector.base to charge about 5
seconds, then connectOK
again.
Check whether there is aNGCheck IC601 and their
250 Hz data waveform atperipheral circuit.
pin 55 of IC603.
OK
Check IC603 and its
peripheral circuit.
16 |
ACEC
