Bell System 2-72 Multi Way Installation And Operating Manual page 29

tabellet Apartment Station 2-72 Way System
BSC4 Video Controller Tests
When the system is idle (no calls in progress) pressing the 'Test' button activates the
'Audio On, 'Status' and one of the 'Select n' LED's for 3S. If the system is not idle (Version
2 only) pressing the 'Test' button will cause a system wide reset.
There are 4 green LED's which indicate power to the individual apartment stations, on
board fuses will operate if a short exists.
The BSC4 also has 4 'Phone' test buttons which can be used to verify the 'data'
connection to the apartment station. Pressing the 'Test Phone n' button should cause the
apartment station and extensions, if any, to ring and the associated 'Select n' Led to light.
Touching pickup or touching view will cause the 'Audio On' and 'Select n' LED's to light.
There will be no audio as no door panel is active. The display on the apartment station will
light up to grey or blue unless the video camera is directly wired to the BSC4 input.
Touching pickup again will cause all the LED's to extinguish. Touching the lock symbol
instead will cause the 'Status' LED to light and after 3S all the LED's will go off.
If this sequence works repeatedly then the A and B data connections are probably OK.
and the +28V and 0V must also be OK. The test also shows that the BSC4 software is
running and diagnostics can now focus on the door controller to video controller wiring.
If it fails an apartment station can be connected locally with a short cable to eliminate the
cable being faulty.
Lock Release Problems
Lock release does not operate
or clicks but does not open.
Maglock does not hold
strongly.
TEST:
Press 'Test' Button on Door
Controller (when system idle):
Lock release operates all the
time or in reverse.
Lock operates from the exit
button but not the test button
or apartment station.
PD-307 Issue 2
 Connections to Lock Release are open or shorted.
 Voltage drop due to cable too thin.
 Lock current is too high; Power supply is resetting.
 Lock release jammed due to over tight fitting.
 Voltage drop due to cable too thin.
 Confirm 'LOCK' LED illuminates for 3 seconds.
 Check Output Voltage at LOCK terminals.
 Check fail safe/fail secure SW2-4 selection matches
the lock type.
 Normally closed switch has been used for exit button.
 Normally closed switch has been used for exit button.
Installation and Operating Manual Page 29 of 48