Set the handset in the NG test mode 3, check whether deviation of the TX data is app. 9.0 kHz Dev.
Check whether there is a NG 250 Hz data waveform at �MOD� of RF unit. OK Check handset RF unit.
Check R635, R636, R634, R632, C611, R619, RT603 and C669.
OK Set the handset in the NG 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. OK Place the handset on the base to charge about 5 seconds, then connect again. Check whether the 250 NG Hz data waveform from pin 9 of IC606 is fed. OK Check IC606, Q612 and NG their peripheral circuit. OK Check handset RF unit.
Check whether there is a NG 250 Hz data waveform at the Q601 collector. OK Check whether there is a NG 250 Hz data waveform at pin 55 of IC603. OK Check IC603 and its peripheral circuit.
