Unit installation

719S 2 Door Switching Unit

System Troubleshooting

NOTE

Voltages below refer to AC for AC telephone systems and DC for DC telephone

systems unless otherwise specified.

PROBLEM COMMON CAUSE AND ACTION

Low speech volume. ! 'Vol A' or 'Vol B' adjustment required on

the Speech Unit.

! Speech Unit is not tight against the panel

grill.

! Panel grill is blocked.

! Speech Unit supply voltage low. Check

11.5V-15V across 'C' and 'H' on unit.

! More than one active telephone is off the

hook.

Constant tone/feedback

when in use.

! 'Vol A' or 'Vol B' adjustment required on

the Speech Unit.

! Missing 'O' connection on telephone.

! Speech Unit is not tight against the panel

grill.

! Entrance panel and telephone to close

together.

! The entrance panel is surrounded by

reflecting walls.

! Panel grill is blocked.

Speech not audible when

phone is buzzed.

! No/low supply to Speech Unit. Check

11.5V-15V across 'C' and 'H' on the unit.

! Faulty 'R', 'O', or 'T' line between

Switching Unit and phone or Switching

Unit and panel.