AT&T System 25 - Manual (Page 262)

MAINTENANCE
P r o c e d u r e s :
1. Make sure that the appropriate ZTN79 CP is translated.
2. Check for the presence of -48 volts at test point on front of cabinet.
Symptoms:
Inoperative
used.
P r o c e d u r e s :
1. If LOCAL
display-equipped voice terminal when LOCAL button is
button/lamp
activate LOCAL button.
is off, and voice terminal is inoperative,
2. If terminal is still inoperative, check for other problems.
Virtual Facilities Troubles
Refer to Figure 4-12 for assistance in clearing virtual facilities troubles.
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