7. The voice of the caller cannot be heard (incoming call).
Can the base and handset be connected? OK The 1 kHz, 65.0mV sine waveform is applied to TELline of the base, can the 1 kHz sine waveform from the Q2 collector be fed? OK Check whether there is the 1 kHz sine wavefor m at pin 12 of IC2. OK Check whether there is the 1 kHz sine waveform at pin 17 of IC602 on the handset unit. OK Check SP801, W801 and W802. NG Check IC602 and its peripheral circuit. NG Check IC2 and its peripheral circuit. NG Check the base TEL-network circuit and REPLAY (RL1) control circuit. NG See 3. The base and handset cannot be connected.
