Nortel Meridian 1 Planning, Installation And Operating Instructions page 489

Page 470 of 536
553-3121-210 Standard 3.0
Chapter 25 — Fault locating and clearing
You must clear power faults before you try to clear other types of faults in the
system. You must clear power faults in the main cabinet before clearing
power faults in an expansion cabinet.
If the fault is not cleared after you have gone through each possible cause,
check the most recent fault indications. Also check
page 458 to see if another type of fault is indicated.
After the fault is corrected, go to
to completely restore normal operation.
Table 69
Power fault indications
Indicator
System messages
Visual indicators
User reports
January 1999
"Final maintenance procedure" on page 534
Possible indications
BSD090 messages
Alarms
Green LED off on cabinet power supply
LED lit on PFTU
Circuit breaker tripped (down)
Remote alarm
Difficulty reported by attendant
No ring on 500/2500-type telephones
"How to clear faults" on