NEC Neax 2400 Imx System Operations And Maintenance Manual

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2.7 Alarm Tests
An alarm is to be generated which will be displayed at the DESKCON/ATTCON. Be sure to inform 
the attendant of the test in advance.
Replace the –48V fuse in the FANU with a blown fuse.
Confirm that an alarm is indicated on the TOPU.
Replace the blown fuse with the original –48V fuse.
Using the RALM command, reset all alarm indications.
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2.8 Main Power System Check
Note:For a longer battery life, observe the following items:
Place the batteries in a dark, cool place.
Keep the room temperature within the range of 10°C to 35°C (40°F to 85°F).
Floating voltage must be kept within the range of the battery specification at all times.
After discharging, perform equalized charging as per the battery specification. Check the load voltage (DC –48V ±5 V) of the rectifier....

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2.9 Trunk RGU Check
Check alarm lamps on the line/trunk circuit cards.
Check to see if a system message pertaining to a circuit card has been output.
Check the speech path for each PIM and also check ringing signal.
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2.10 ATTCON/DESKCON Check
(1) Attendant Console Check
Note:Adjusting Time Method (see Figure 7-2.)
If the Hour (H) button is pushed once, the time will advance one hour. (To push the button, use a thin
object, such as a toothpick.)
If the H button is held continuously, the time will advance one hour each second.
If the Minute (M) button is pushed once, the time will advance one minute.
If the M button is held continuously, the...

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(2) Desk Console Check
Note 1:The lamp checks can be suspended any time when the * key on the control panel is pressed.
Note 2:The DESKCON obtains time information only from the PBX side. Therefore, adjust the time and date
using the MAT command.
Figure 7-3   Desk Console
Ask the operator at each DESKCON if the DESKCON is operating normally.
On the DESKCON control panel, each operator presses the L3, SRC, and Release keys...

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2.11 System Check
Check the OPE lamps (green) on all circuit cards.
Check whether a system message pertaining to the CPU/TSW has been output.
Check speech conditions by establishing a station-to-station connection at each PIM.
If the condition is abnormal, determine the nature of the problem (dial tone cannot be heard, 
no speech can be established, etc.)
Does the condition occur in No. 0 TSW or in No. 1 TSW?
Does the condition occur...

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3. ROUTINE MAINTENANCE CHECK LISTS
This section provides check lists (Maintenance Procedure Reports) to be used when performing routine main-
tenance. The Routine Maintenance Check Lists consists of the following items:
 Maintenance Procedure Report
 C.O. Trunk/Tie Line
 Register/Sender Trunk (RST)
 Digital Conference Function
 Speech Path for each PIM, and Ringing Generator Unit
 Attendant/Desk Console 

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USER NAMESIGNATURE OF 
SUPERVISORWORK TIME
(FROM -  )
Name of User (Company) Date: Maintenance
ClassificationRoutine/Non-
routine
Control No. Maintenance
Company
Name of Equipment Room Temperature - °C 
°F & humidity %Name of Worker
Reference 
SectionItem Detail Check Reference 
SectionItem Detail Check
2.1Check of Ambient 
Conditions in the 
Switch RoomAmbient 
Temperature2.9Trunk RGU Check SND Trunk
Relative humidity DCF Function...

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C.O. Trunk/Tie Line
TEST TYPE TEST ITEM CONNECTION DIAGRAM
C.O. Trunk/Tie Line 
Speech Path Test Set up a speech path test by
seizing a trunk using the 
Station or ATTCON/DESKCON 
connection test diagrammed to
the right. Connection Test-Station 
 Connection Test-ATTCON/DESKCON
C.O. Trunk/Tie Line
NAME OF TRUNK ROUTEACCESS 
NUMBERROUTE 
NUMBERTRUNK 
NUMBERCHECK REMARKS
LCTRK
C.O./Tie
Line
ATITRK
C.O./Tie
Line
ATTCON/
DESKCON 

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Register/Sender Trunk (RST)
TEST TYPE TEST ITEM CONNECTION DIAGRAM
ORT Function   Perform the test by specifying 
an ORT using the Connection 
Test-Station.
 Confirm that [6-I] system 
message displays as a result of 
the test.DP/PB
SENDER Function   Perform the test by specifying 
an ORT using the Connection 
Test-Station. 
 Confirm that [6-I] system 
message displays as a result of 
the test.
LC
ORT
LC~
SND
ORT