Introduction - NEC Electra Elite IPK II System Hardware Manual

System Maintenance
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S 1 I
ECTION NTRODUCTION
The technician can use this chapter to troubleshoot and diagnose problems during
and after system installation. The troubleshooting flow charts and general test
procedures help the technician identify possible causes of the problem by defining the
problem area.
Using the System Data Upload/Download feature, all System Programming and
Speed Dial data can be stored on disk for safe keeping. After all System
Programming is completed, it should be downloaded to a disk for backup. When
system memory fails, this data on the disk can be uploaded and the memory restored.
S 2 O
ECTION
The effectiveness of this maintenance section depends on the technician. Due to
external factors, the technician should not make any assumptions. For example, do
not assume that a new power supply used to replace another power supply is working
properly. Check the output of the power supply with a Volt meter.
The ESI(8)-U( ) ETU allows the measurement of +5V and –24V. This ETU can be
used in the expansion KSU for the power output measurements. Refer to
Voltage
be available. Some of these are listed below:
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System Hardware Manual
C
PERATIONAL URRENT AND
Measurement. Before the technician can troubleshoot, the correct tools must
Digital or analog multimeter that can read DC and AC current and voltage and
DC resistance.
Test Set (lineman) that has termination and monitor modes and DTMF and DP
dialing.
Hand tools such as:
Screwdrivers (flat and Phillips head)
H
Pliers (long nose and diagonal)
H
Punch down tool
H
V C
OLTAGE HECKS
Chapter 14
Table 14-1
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