NEC Electra Elite IPK II System Hardware Manual page 619

Electra Elite IPK II
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No LED or Display Indications on any Multiline Terminal
Terminate one Multiline Terminal from
the basic KSU, 1st ESI(8)-U10
(Programming Station) directly to MDF
and test.
Check
Station
Cabling.
Reset ESI(8)-U10. If trouble
persists, replace ESI(8)-U( ).
Indications?
None
1. If problem not solved, perform First Initialization
and test. If trouble persists go to step 2.
2. Replace CPUII( )-U( ) ETU and test system using
default program.
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System Hardware Manual
A2
All DC
Incorrect or No DC Voltage
Voltages
OK?
Good
Turn system Off. Disconnect
Yes
connectors; remove all ETUs
No
except CPUII( )-U( ) ETU and
Terminal
first installed ESI(8)-U10 in
Indications?
basic KSU, associated with the
programming station.
No Indication
Correct
Correct AC Power
Problem.
Replace
Fuse(s).
Terminal
Installed
Indication?
Done.
Correct
Indication
Rebuild System one card at
a time. If problem reappears
replace defective card(s).
Build system
one card at a
time and
replace bad
ETU(s).
Document Revision 3
Check AC Input
Power.
Bad
AC Power?
Good
Bad
PSU Fuses
F1 and F2
Good?
Good
Replace Corresponding
Power Supply.
Yes
Problem
Solved?
No
Remove all ETUs but
one ESI, and retest.
Yes
Problem
Solved?
No
Replace KSU.
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