Electra Elite
Issue 6
System Hardware Manual
10 - 7
No Internal Dial Tone to any Multiline Terminal or SLT
Incorrect or No DC Voltage
Check AC Input
Power.
DC
Voltages
Correct?
Good
Bad
AC Power?
Good
Turn system Off. Disconnect all
circuit boards.
Turn system On.
Dial tone on Multiline
Terminal on 1
st
ESI(8)-U( )
(MBD-U10 Unit)?
Replace
Fuse(s).
Bad
PSU Fuses
F1 & F2
?
Good
No Dial Tone
Yes
Problem
Solved?
No
Dial Tone?
Dial Tone
Rebuild system, one
card at a time until
problem reappears.
Replace defective
card.
Problem
Solved?
Build system
one card at a
time, and
replace bad
ETU(s).
Yes
No
1. If problem not solved, perform First Initialization
and test. If trouble persists go to step 2.
2. Replace B48-U10 KSU and test system using
default program.
Reset ESI(8)-U( ) ETU. If trouble
persists, replace B48-U10 KSU.
A1
Replace Corresponding
Power Supply.
Remove all ETUs and
retest.
Replace KSU.
Correct AC Power
Problem.
Done.
Dial Tone
No Dial Tone
Summary of Contents for ElectraElite 48
Page 2: ...SYSTEM HARDWARE MANUAL Stock Number 750376 Issue 6 Series 8000 48 ...
Page 3: ......
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Page 9: ...THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 10: ...Regulatory Information ...
Page 11: ......
Page 51: ...Issue 6 Electra Elite xxxii List of Figures THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 56: ...1st Tab Chapter 1 Introduction ...
Page 57: ......
Page 78: ...2nd Tab Chapter 2 System Specifications ...
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Page 102: ...3rd Tab Chapter 3 Hardware Requirements ...
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Page 110: ...4th Tab Chapter 4 Installing the KSU ...
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Page 135: ...Issue 6 Electra Elite 4 24 Installing the KSU THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 136: ...5th Tab Chapter 5 Installing Electronic Telephone Units ...
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Page 256: ...6th Tab Chapter 6 Installing Electra Elite Multiline Terminals ...
Page 257: ......
Page 290: ...7th Tab Chapter 7 Installing Optional Equipment ...
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Page 344: ...8th Tab Chapter 8 Installing Dterm Series i Equipment ...
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Page 358: ...Electra Elite Issue 6 System Hardware Manual 8 13 Figure 8 15 Removing the Line Panel ...
Page 396: ...9th Tab Chapter 9 Installing Electra Professional Equipment ...
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Page 404: ...10th Tab Chapter 10 System Maintenance ...
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Page 428: ...11th Tab Appendices ...
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Page 433: ...Issue 6 Electra Elite A 4 Glossary of Abbreviations THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 434: ...SYSTEM HARDWARE MANUAL NEC America Inc Issue 6 Series 8000 48 ...
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