User's Manual

CHAPTER 5 NDA-24300
Page 380
Issue 1
FAULT REPAIR PROCEDURES
11.1 When Cause for Fault Cannot Be Identified
Check power supply circuits. Check voltage (DC: -48V, ±5V) at LOAD side
of the rectifier.
Confirm that NFB (circuit breaker) on all PWR
supplies is at ON position (UP side).
Check to see if there is any PWR supply to
which the alarm lamp illuminates.
System Initialization by loading office data
and program data from the hard disk (Refer
to Chapter 6.)
Service connections such as
station-to-station connection
cannot be set up.
See “Check by Minimizing the System
Configuration” on the next page.
Service connections such as
station-to-station connection can
be set up.
Data in the memory is temporarily destroyed.
Observe the situation for a while.
START
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