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A
Set the handset in the NG test mode 3, check whether deviation of the TX data is app. 8 kHz Dev.
Check whether there is a NG 250 Hz data waveform at �MOD� of RF unit. OK Check handset RF unit.
Check RT403, R441, R442, R443, R444, R445 and C453.
OK Set the handset in the NG test mode 6, 926.997467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack 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 IC401 is fed. OK Check IC401, Q401 and NG their peripheral circuit. OK Check handset RF unit.
Check whether there is a NG 250 Hz data waveform at the Q402 collector. OK Check whether there is a NG 250 Hz data waveform at pin 40 of IC404. OK Check IC404 and its peripheral circuit.
Check RT402, Q402 and their peripheral circuit.
Check R428, R429, IC403 and their peripheral circuit.
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