Bell System BL106 Manuel d'utilisateur télécharger pdf (Page 42)

CS106/BL106 Combined Door Entry and Coded Access

42

Symptom

Possible Cause/Remedy

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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