NEC Neax 2400 Imx System Operations And Maintenance Manual

CHAPTER 6 NDA-24238
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NDA-24238 CHAPTER 7
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CHAPTER 7 ROUTINE MAINTENANCE PROCEDURE
1. GENERAL
When a fault has occurred in the system, (for example when a fault has occurred to No. 1 circuit on the 16LC
card), the stations connected to No. 1 circuit become unserviceable. When the 16LC card has been replaced
with a spare to analyze the cause of the fault or to repair the fault, other normal lines also become unservice-
able. As in this example, even when the fault is...

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1.2 Required Test Equipment and Tools
Table 7-1 shows the tools and equipment required for test procedures.
Table 7-1  Test Equipment and Tools
NO. TEST EQUIPMENT/TOOLS PURPOSE REMARKS
1 Telephone Set A telephone set is used when performing connection tests 
on trunks, etc.
2 Blown Fuse A blown fuse is used when performing alarm tests.
3 VOM  Digital  Meter VOM digital meter is used when checking output voltages 
of the rectifier and...

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2. ROUTINE MAINTENANCE PROCEDURES
This section explains general routine maintenance procedures to be performed on a daily, monthly, and quar-
terly basis. Table 7-2 lists each procedure according to the time each procedure is to be performed. Use the
Reference Section to locate the detailed procedure.
Table 7-2  List of Routine Maintenance Procedures
TIME PROCEDURE REFERENCE SECTION REMARKS
Daily Check the temperature and relative...

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2.1 Ambient Conditions in Switch Room Check
Check the room temperature.
Check the humidity in the room.
If the temperature or the humidity is 
outside the allowable range, adjust the air 
conditioner.Check whether the room temperature is within 
the range of 5°C (41°F) to 30°C (86°F).
Check whether the relative humidity in the 
room is within the 15% to 65% range.
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2.2 Alarm Check
Check alarm indications on the TOPU.
If an alarm is indicated Check whether the alarm lamp on the power 
supply of any module is lit.
Check whether an alarm lamp is lit on any 
circuit card(s).
Alarm recovery Refer to Chapter 5, diagnose the alarm, and 
perform the indicated recovery procedures.
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2.3 MAT/Printer Check
Check the MAT.
System messages are automatically sent to 
the MAT HD for output.
System messages are automatically sent to 
the external printer for output.Turn ON the MAT’s power.
Confirm that the menu appears on the screen.
Leave the MAT power ON continuously (lower 
the CRT brightness when not in use).
Confirm that printer power is ON and that the 
SEL lamp is lit.
Check the remaining quantity of printer...

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2.4 Collection of System Messages
Cause system messages to be displayed.
When a system message is displayed.
Check the results of routine diagnosis.
When the system is operating normally or 
after a fault is restoredRefer to Chapter 3.
If the system message indicates a fault, 
diagnose the fault by referring to Chapter 5, 
and perform fault recovery.
System message [7-O] indicates that the 
system is normal.
System message [7-P]...

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2.5 Display of Locked-out Station
Check the displays of relevant commands 
to locate any locked-out stations.Check the displays of the following 
commands:
  DLSL: Display in the order of LENS
  DLSS:  Display in the order of Station 
Numbers
When any station in locked-out 
state is displayedRecover the locked-out station(s) referring to 
Section 3, Indication of Lockout Stations, in 
Chapter 6.
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2.6 Fan Unit Check
When fan is set for automatic start
When fan is set for constant operation
When fan is out of orderPull FAN START switch toward the front and 
set it to ON (UP) position.
Confirm that the fan has started running.
Pull FAN START switch toward the front and 
set it to AUTO (DOWN) position.
Confirm that the fan is running.
Refer to Section 9, Fan Unit Fault, in Chapter 
5. 
Replace the fan with a spare by referring...