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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.
17
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