NEC Electra Elite 192, Hardware Manual

Page: 350 / 369

Issue 6 Electra Elite
9 - 8 System Maintenance
Turn system off. Disconnect
connectors; remove all ETUs
except CPUB( )-U10 and
first installed ESI(8)-U10 in
basic KSU, associated with
the programming station.
No LED or Display Indications on any Multiline Terminal
Incorrect or No DC Voltage
Check AC Input
Power.
All DC
Voltages
OK?
Good
Correct AC Power
Problem.
Bad
AC Power?
Good
Bad
Terminate one Multiline Terminal from
the basic KSU, 1st ESI(8)-U10
(Programming Station) directly to
MDF and test.
Replace
Fuse(s).
Terminal
Indications?
Yes
No
Check
Station
Cabling.
PSU Fuses
F 1 and F 2
G ood?
Replace Corresponding
Power Supply.
No Indication
Terminal
Installed
Indication?
Yes
Done.
Problem
Solved?
No
Replace KSU.
No
Problem
Solved?
Yes
Correct
Indication
Reset ESI(8)-U10. If trouble
persists, replace ESI(8)-U10.
Correct
Indications?
None
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.
Build system
one card at a
time and
replace bad
ETU(s).
Remove all ETUs but
one ESI, and retest.
Rebuild System one card at
a time. If problem reappears
replace defective card(s).
Good
A2