NEC Electra Elite 192, Hardware Manual

Page: 349 / 369

Electra Elite Issue 6
System Hardware Manual 9 - 7
No internal Dial Tone to any Multiline Terminal or SLT
Incorrect or No DC Voltage
Check AC Input
Power.
All DC
Voltages
Correct?
Turn system Off. Disconnect all
connectors and remove all printed
circuit boards except C P U B ( )-U 10
and the first installed E S I(8)-U 10 in
the basic K S U associated w ith the
program m ing station .
Correct AC Power
Problem.
Bad
AC Power?
Good
Bad
Good
Replace Corresponding
Power Supply.
PSU Fuses
F1 and F2
good?
Turn system On.
Dial Tone on Multiline
Terminal on 1st ESI(8)-U10?
Dial Tone
No Dial Tone
Replace
Fuse(s).
Reset ESI(8)-U10. If trouble
persists, replace ESI(8)-U10.
Yes
Done.
Problem
Solved?
No
Build system, one card
at a time until problem
reappears. Replace
defective card.
No
Dial tone?
Yes
Remove all ETUs but
one ESI, and retest.
Replace KSU.
No
Yes
Problem
Solved?
Build system
one card at a
time and
replace bad
ETU(s).
1. If problem not solved, perform First Initialization
and test. If trouble persists go to step 2.
2. Replace CPUB( )-U10 and test system using
default program.
A1
Good