When the symptom is A-RT call light lights, but NO alarm beeps are heard
in the handset, and when the handset is moved to the KY-57 audio connector,
alarm beeps are heard.
This identifies the received signal path as the bad circuit.
symptom would be caused by an open circuit. Trace the receive signal path
circuit and identify the possible bad items of equipment see figure 104.
Dashed line represents circuits that were checked good in Plain
Possible bad items are:
Receive signal path, circuit (Possible bad items).