Bell System BSX - Page 23

BSX Isolated Audio Entry System
PD-142 Issue 1 Installation and Operating Manual Page 23 of 32
 Call the phone under test by pressing the required button and confirm by observing that
the corresponding LED on the BSX PCB is illuminated
 Using a voltmeter:
a) Check the voltage between I and O: +12V pulsing (The ring voltage)
b) Check the voltage between V and O: +12V steady (Power for BS-LX model only)
Repeat the voltage test at various points as detailed below to diagnose the fault:-
Test
Result
Action
Test voltages at phone PCB
OK
Check phone by substitution
Otherwise:
Test voltages at BSX PCB
OK
Faulty cable or connections
If Not OK
Check fuse
Otherwise:
Unplug phone connections;
Test voltages at BSX PCB
OK
Faulty cable or connections
If Not OK
Check fuse
Call Technical