NEC ELECTRA ELITE IPK II - Before Initializing; Cable Connections; Chapter 14 General Information

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14 - 2 System Maintenance
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Document Revision 3 Electra Elite IPK II
SECTION 3OPERATIONAL TEST PROCEDURES
3.1 General Information
When an Electra Elite IPK II system is first powered up, an initialization is
performed. During this process the CPUII( )-U( ) ETU, located in the Basic
KSU, scans each interface slot to determine the hardware configuration used.
This information is stored in the resident system program memory with the
system default values. This section provides test procedures that are used
before, during, and after the initialization process.
3.2 Before Initializing
The technician must follow these steps before initializing the system.
3.2.1 Cable Connections
All wiring for power supplies or flat cable connectors should be
checked for solid connections.
3.2.2 AC/DC Power
Check all power with an AC/DC multimeter. (Refer to Table 14-1
Voltage Measurement.) Run this test with only the CPUII( )-U( ) ETU
and the ESI(8)-U( ) ETU installed.
Table 14-1 Voltage Measurement
Voltages Tolerance Measuring Points
ESI(8)-U( ) ETU
+5V
–-24V
+5 ± 0.25V
–24 ± 0.25V
ESI(8)-U( ) ETU TP1 +5V
TP2 GND
TP3 –24V
AC Voltage (117 Vac)
Line to Neutral
Line to Conduit Ground
Neutral to Conduit Ground
117 Vac ± 15%
117 Vac ± 15%
.05 Vac (maximum)
AC Terminal Strip
Line L to N
Line L to G
Line N to G
Ring Generator (SLT) 70 ~ 120 Vac @ 20 Hz
 Ring voltage
may be lower
if the meter
measures only
60 Hz signals.
Across Tip and Ring of Ringing
SLT
CO Line
Off-hook line current
25 ~ 50 mA In series with Tip side of the CO
line at the MDF