NEC NDA-24300 manual When Cause for Fault Cannot Be Identified, Start

Models: NDA-24300

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FAULT REPAIR PROCEDURES

11.1 When Cause for Fault Cannot Be Identified

START

Check power supply circuits.

System Initialization by loading office data and program data from the hard disk (Refer to Chapter 6.)

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.

Service connections such as

station-to-station connection cannot be set up.

Service connections such as station-to-station connection can

be set up.

A

See “Check by Minimizing the System Configuration” on the next page.

Data in the memory is temporarily destroyed. Observe the situation for a while.

CHAPTER 5

NDA-24300

Page 380

Issue 1

Page 407
Image 407
NEC NDA-24300 manual When Cause for Fault Cannot Be Identified, Start