NEC Neax 2000 Ivs2 Maintenance Manual

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 103
(3)  If Dial Tone is returned after seizing 
the original trunk, there is a 
problem with the distant office, the 
Carrier Equipment, or the line. 
(4)  If not, check for trouble with wiring 
on the MDF and the trunk card.
Any dialed digit is not transmit-
ted to the distant office.(1)  System Data Programming for the 
trunk route: CM35 Y=01, 08, 20 
(2)  When the Sender Start condition is 
set to Wink or Delay Dial by CM35 
Y=20, check if answer signal is 
returned from the distant office.
(1) Trunk card 
(2) FP card
(3) MP card
B
C
~
MDF
DT ODT
ODTE
M
E
M
CHECK
REPLACE 
						

							 NEAX2000 IVS2 Maintenance ManualPage 104  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
After dialing the first digit, Dial 
Tone from the distant office is 
not disconnected.(1)  Appropriate signal (DP/DTMF) to 
distant office is transmitted. 
  System Data Programming for DP 
signal: CM35 Y=01, 13, 23, 25, 45 
  System Data Programming for 
DTMF signal: CM35 Y=01, 13, 24, 
26, 46
(2)  System Data Programming for 
Numbering Plan: CM20>A100-
A163, 
CM20>A200-A231, 
CM22, CM23, CM26
(1) Trunk card 
(2) FP card
(3) MP card
C
END
CHECK
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 105
(2) On Incoming Call
C.O. Incoming Call is not termi-
nated to ATTCON Station, DIT 
or TAS Buzzer.
BL lamp on the trunk 
card is not turned on.(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  Connect a test telephone set to the 
line on the MDF. 
(3)  If the telephone rings, check for 
trouble with wiring on the MDF and 
the trunk card. 
(4)  If not, there is a problem with the 
distant office or the line.
(1) Trunk card
BL lamp is turned on. (1)  System Data Programming for the 
trunk 
  In case of Termination to DIT sta-
tion: CM30 Y=02, 03, 04, 05, 13, 
14, 17, CM35 Y=09 
  In case of Termination to TAS 
Buzzer: CM30 Y=02, 03 START
A
CHECK
MDF
TRUNK
To C.O. Line
Test Telephone Set
ATTCON
REPLACE
CHECK 
						

							 NEAX2000 IVS2 Maintenance ManualPage 106  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
No Dial Tone Connection on 
Tie Line Incoming Call (only for 
the 2nd dial tone system)(1)  In case all Tie Line Trunks fail, check 
if DTMF Receivers for Tie Line 
Incoming Call are installed (only 
when the signal kind of the trunk is 
DTMF).
In case of ODT card (1)  System Data Programming for the 
trunk: CM35 Y=00, 09, 10.
(2)  Disconnect trunk from the line on 
the MDF. 
(3)  To perform a Loop-Back Test, make 
a back to back connect of the trunk 
and another trunk within the system 
at the MDF. 
(4)  If Dial Tone is returned when the call 
is terminated to the original trunk, 
there is a problem with the distant 
office, the Carrier Equipment, or the 
line. 
(5)  If not, check for trouble with wiring 
on the MDF and the trunk card.
(1) Trunk card
A
BCHECK
CHECK
~
MDF
DT ODT
ODTE
M
E
M
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 107
The Tie Line Incoming Call/DID 
Call is routed to a different 
station other than the dialed 
station, or to Reorder Tone.(1)  System Data Programming for the 
trunk: CM35 Y=01, 17, 61-68
(1) Trunk card 
(2) FP card
(3) MP card
B
END
CHECK
REPLACE 
						

							 NEAX2000 IVS2 Maintenance ManualPage 108  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
(3) On Answering the Call
Speech Path Trouble: 
No connection/One way 
connection(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  To perform the Speech Path Test 
internally, make the following 
connection on the MDF according 
to type of card.  START
ACHECK
MDF
ODT
ODTE
M
E
M
MDF
COT
      
ATTCON
STATION PORT
 In Case of COT Card
 In Case of ODT Card 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 109
(3)  If the trouble remains, replace the 
trunk card. 
(4)  If not, there is a problem with the 
distant office.
(1) Trunk card 
(2) FP card
(3) MP card
Call is dropped (This condition 
excludes the Line Fault 
detected within a system).
When the station user 
flashes the switch-hook(1)  System Data Programming for the 
trunk: CM35 Y=16
When the failure 
occurs suddenly(1)  Disconnect the trunk from the line 
on the MDF. 
(2)  Connect a test telephone set to the 
line on the MDF, and check if the 
failure reoccurs. 
(3)  If the failure recurs, there is a 
problem with the distant office. 
(4)  If not, replace the trunk card.
(1) Trunk card
(2) FP card
(3) MP card
A
B
REPLACE
CHECK
CHECK
REPLACE 
						

							 NEAX2000 IVS2 Maintenance ManualPage 110  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
Transmission quality is not 
acceptable.
Noise/Distor tion (1)  Cabling between the PBX and the 
MDF or between the MDF and the 
lines is properly run to avoid 
induction from an AC power cable, 
motor or power supply equipment.
(1) Trunk card
(2) FP card
(3) MP card
(4) PWR card
Low Voice Level (1)  Loose connection of cables on the 
MDF
(1) Trunk card
(2) FP card
(3) MP card
Cross Talk (1)  Proper wiring on the MDF
(1) Trunk card
(2) FP card
(3) MP card
(4) PWR card
B
END
CHECK
REPLACE
CHECK
REPLACE
CHECK
REPLACE 
						

							CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
NEAX2000 IVS2 Maintenance Manual    
ND-70926 (E), Issue 1.0   Page 111
POWER FAILURE TRANSFER (PFT) FAULT
Preassigned stations are not 
connected to the C.O. line 
when system alarm or power 
failure has occurred.(1)  Cross connection on the MDF is 
properly made. 
(2)  Proper connection between the 
AUC card and the COT card
(1) AUC card
PFT operates without Power 
Failure or Emergency Alarm.(1) AUC card
(2) MP card START
END
CHECK
REPLACE
REPLACE 
						

							 NEAX2000 IVS2 Maintenance ManualPage 112  ND-70926 (E), Issue 1.0
CHAPTER 2  TROUBLESHOOTING
Fault Diagnosis and Troubleshooting
Dterm FAULT
This troubleshooting procedure covers faults with the D
term function only. For other faults, see
Station Line Fault on Page 98.
All Keys on the D
term are 
ineffective.(1) Wiring on Modular Box (Rosette) 
(2) DLC card is properly mounted.
(3) System Data Programming for the 
D
term station: CM10, CM11, CM12, 
CM13, CM90, CM93 
(4) RUN lamp on the FP card and MP 
card is flashing.
(1) D
term 
(2) DLC card
(3) FP card
(4) MP card
Speech Path Trouble: 
No Connection/One Way 
Connection(1) D
term 
(2) DLC card
Hands Free Operation is not 
available.(1) MIC lamp is on. 
(2)  Adjust speaker volume. 
(3)  Built-in Hands Free Unit is properly 
mounted.
(1)  Hands Free Unit within D
term 
(2) D
term
START
A
CHECK
REPLACE
REPLACE
CHECK
REPLACE