AT&T SYSTEM 25 Manual page 174

The attendant can test the lights and ringer on the attendant console and the lights on the
selector console. On some DTACs, the Test/Program switch has a spring. If so, the switch
must be held in the "T" position to test the lights and ringer; the switch will automatically
return to the midpoint when it is released. On the Selector Console, the TEST button is
located on the bottom (far right), with the Group Select buttons.
Testing the
Consoles
1
Slide the switch on the left side of the console to "T".
The red and green lights alternately light and the ringer sounds.
2 Slide the switch back to the midpoint between "T" and "P".
Testing the Selector Console
1
Press
The red lights cycle on and off sequentially.
2
Press
NOTE: The
buttons.
3
Press
The test stops.
Typical Display:
During the test procedure, the SLAC display shows 16 blackened character positions. After
the switch is returned to midpoint, the display unit's alarm clock sounds (three short beeps).
Testing the Consoles
.
[TEST]
again.
[TEST]
individual lights can be tested by pressing the adjacent
a third time.
[TEST]
Testing the Consoles 3-57