NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 7
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3.3 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 paper....

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3.4 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 has been restoredRefer to Chapter 3, System Messages.
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...

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3.5 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, 
Chapter 6. START
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3.6 Fan Unit Check
When the fan is set for automatic start
When the fan is set for constant operation
When the fan is out of orderPull the FAN START switch toward the front 
and set it to ON (UP) position.
Confirm that the fan has started running.
Pull the FAN START switch toward the front 
and set it to AUTO (DOWN) position.
Confirm that the fan is running.
Refer to Section 10, Fan Unit Fault, Chapter 5. 
Replace the fan with a spare by...

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3.7 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/RALMN command, reset all alarm indications. START
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3.8 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.
Check...

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3.9 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. START
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3.10 ATTCON/DESKCON Check
(1) Attendant Console Check
Note:Adjusting Time Method
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 time will advance one...

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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 simultaneously...

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3.11 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 in...