Constant tone/feedback
when in use.
Volume adjustment required on the
Speech Unit.
Speech Unit is not tight against the
panel grill.
‘O’ connection between Speech unit
and telephone is open circuit.
Entrance panel and telephone are
too close together.
The entrance panel is surrounded by
reflecting walls.
Panel grill is blocked.
No speech when the phone
is buzzed
Wiring fault on the speech signal
connections ‘R’ or ‘T’: ‘R’ carries the
phone microphone signal to the
speech unit; ‘T’ carries the Speech
unit microphone to the phone.
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