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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 RT603, R619, R632, R634, R635, R636 and C610.
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 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.
Check RT602, Q601 and their peripheral circuit.
Check R696, R600, R621, R624, Q602, IC607 and their peripheral circuit.
