5. TROUBLE WITH INTERCOM MODE
5-1. The voice from the Base unit cannot be heard on the Handset.
Check whether there is an audio waveform on Pin 23 of IC20. OK NG Check MC401 and IC20.
Check Pin 2 of IC15.
5-2. The voice from the Handset cannot be heard on the Base unit.
Check whether there is an audio waveform on Pin 4 of IC15. OK NG Check IC15.
Check whether there is an audio waveform on Pin 14 of IC20. OK
