TOSHIBA SX2809
Manual de Servicio

7. The voice of the caller cannot be heard (incoming call).
Can the base and handset be connected?

NG

See 3. The base and handset cannot be connected.

OK
The 1 kHz, -20 dBm sine waveform is applied to TELline of the base, can the 1 kHz sine waveform from the Q1 collector be fed?

NG

Check the base TEL-line circuit and REPLAY control circuit.

OK
Check whether there is the 1 kHz sine waveform at pin 37 of IC 10.

NG

Check Q8 and its peripheral circuit.

OK
Check whether there is the 1 kHz sine waveform at pin 46 of IC604.

NG

Check IC604 and its peripheral circuit.

OK
Check whether there is the 1 kHz sine waveform at the collector of Q602 and the emitter of Q601.

NG

Check Q601 and Q602.

OK

Check SP801.

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