NEC Electra Elite 192, Hardware Manual

Page: 354 / 369

Issue 6 Electra Elite
9 - 12 System Maintenance
No Outside Dial Tone Access
Multiline
Terminal or SLT?
SLT
Check for Internal
Dial tone.
Check for Internal
Dial tone.
Internal
Dial Tone?
Internal
Dial Tone?
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
1. Perform Second
Initialization.
2. Reset and test
SLI(4)/(8)-U10 ETU.
3. Replace and test
SLI(4)/(8)-U10 ETU.
1. Reset terminal
and test.
2. Replace terminal
OR
3. Reset ESI(8)-U10
ETU and test.
4. Replace ESI(8)-U10
and test.
Leave an SLI(4)/(8)-
U10 and an ESI(8) -
U10 ETU installed.
Go to Flowchart A1.
All
Terminals
affected?
Check for Internal
Dial tone.
Internal
Dial Tone?
Go to Flowchart
A1.
Test for CO dial
tone at MDF with
test set, and check
CO wiring.
Have Telco
check lines.
1. Check Memory Blocks 4-07, 4-08,
and 4-19 for Station Restriction.
2. Check Memory Block 4-09 for
Telephone to Tenant Assignment.
Check SW 1~8 on COI(8)-U10
ETU for proper switch setting.
Check conduit and frame ground
to system for ground start trunks.
CO
Dial Tone?
1. Reset and test; replace COI(8)-U10 ETU and test. If trouble persists go to 2.
2. Perform Second Initialization. If trouble persists go to 3.
3. Perform First Initialization. If trouble persists go to 4.
4. Replace CPUB( )-U10 ETU, and test using default program.
C3
Both