TOSHIBA FT8930
Manual de Servicio

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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 RT603, R641, R642, R643, R644, R645 and C653.

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 IC601 is fed. OK Check IC601, Q601 and NG their peripheral circuit. OK Check handset RF unit.

Check whether there is a NG 250 Hz data waveform at the Q602 collector. OK Check whether there is a NG 250 Hz data waveform at pin 40 of IC604. OK Check IC604 and its peripheral circuit.

Check RT602, Q602 and their peripheral circuit.

Check R628, R629, IC603 and their peripheral circuit.

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