NEC Neax 2400 Imx System Operations And Maintenance Manual

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
TSW Card Replacement Procedure
Use extreme care when operating the keys on the circuit card.
Figure 4-17   LEDs and Switches for TSW Changeover
WA RN I NG
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
System Changeover. Check the following
lamp indications on the circuit cards to be
affected and ensure that they are all OFF:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card) Note
 MUX ACT (MUX cards)
Note:If the TSW card to be replaced
represents system status #0, all
the circuit cards with #0 status
are totally affected. Check the
whole cited cards lamp
indications. (See Figure 4-16
and Figure 4-17.)
Check the following lamp indications on
the mate Speech Path block and ensure that
they are all steady-green:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
TSW ACT lamp on the TSW card remains
OFF.
A
START
Check the ACT mode of the mate
Speech Path System. On the active GT (PH-GT09) card, set the MBR key
UP. Then, return the key DOWN.
On the TSW (PH-SW12) card to be replaced, 
set the TSW MBR key UP.
MUX (PH-PC36)
MUX ACT
MBTSW (PH-SW12)
TSW ACT
TSW MBRMBGT (PH-GT09)
OPE/MB
MBR MBDLKC (PH-PC20)
OPE/MB
MB
FRONT VIEW 
						

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 TSW ACT lamp on the TSW card is 
red.
 TSW ACT lamp on the new card is 
red.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
B
Set TSW MBR and MB keys on the new card UP.
A
Insert the new TSW card into the TSWM.Set the keys on the new card, 
referring to the card replaced.
Extract the TSW card to be replaced
from the TSWM. On the TSW card to be replaced, 
set the MB switch UP.
Confirm M0SY, M1SY, M2SY, and M3SY
LEDs on the new card are all green.  
						

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Note:
The system changeover of TSW card can be executed also by using the CMOD command. For details,
refer to Chapter 8, Maintenance Commands.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 TSW ACT lamp on the new card 
goes OFF.
 TSW ACT lamp on the new card 
remains OFF.
System Changeover
 Replaced TSW: STBY to ACT
 Mate TSW: ACT to STBY
Check the following lamp indications
on the Speech Path block to which the
new TSW card belongs and ensure that
they are all steady-green:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
Check the following lamp indications
on the mate Speech Path block and en-
sure that they are all OFF:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
END
B
Set the MB key on the new card DOWN.
Flip the MBR key on the active GT card. Confirm the 
new TSW card functions normally. Set the TSW MBR key on the new card DOWN.
MBR (on the active GT card)
12 
						

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2.3.3 DLKC Card Replacement Procedure
The DLKC (PH-PC20) card is located in Slot No. 08 or 09 within the TSWM. The card’s main function
is to provide all the Attendant/Desk Consoles with information such as termination/answer/release
(abandoned) of ATT calls or idle/busy status of a station via the link of the TSW system. Use the fol-
lowing procedures to replace the DLCK card with a spare.
Note:The system changeover of DLKC must be executed by the MBR key operation on the active GT (PH-
GT09) card or by using the CMOD command. Before starting this work, confirm the system block
diagram shown in Figure 4-16, or Section 12, System Control Procedures, in Chapter 6.
Replacement Procedure
Use extreme care when operating the keys on the circuit card.
WA RN I NG
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
System Changeover
Check the following lamp indications
on the circuit cards to be affected and
ensure that they are all OFF:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card) Note
 MUX ACT (MUX cards)
Note:If the DLKC card to be
replaced represents system
status #0, all circuit cards
with #0 status are totally
affected. Check the cited
cards lamp indications. See
Figure 4-16 and Figure 4-
17.
Check the following lamp indications
on the mate Speech Path Block and en-
sure that they are all steady-green:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
OPE/MB lamp on the DLKC card is
red.
A
START
Check the ACT mode of the mate
Speech Path System. On the active GT (PH-GT09) card, set the MBR key
UP. Then, return the key DOWN.
On the DLKC (PH-PC20) card to be 
replaced, Set the MB switch UP. 
						

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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Note:
The changeover of speech path system can be performed also by using the CMOD command. For
details, refer to Chapter 8, Maintenance Commands.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 TSW ACT lamp on the new card is red.
 TSW ACT lamp on the new card goes 
OFF.
System Changeover
 Replaced DLKC: STBY to ACT
 Mate DLKC: ACT to STBY
Check the following lamp indications on the
Speech Path block to which the new DLKC
card belongs and ensure that they are all
steady-green:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
Check the following lamp indications on the
mate Speech Path block and ensure that they
are all OFF:
 TSW ACT (TSW cards)
 OPE/MB (DLKC card)
 MUX ACT (MUX cards)
Refer to Figure 4-16 and Figure 4-17.
END
On the new DLKC card, set the MB key DOWN.
A
Extract the DLKC card to be replaced 
from the TSWM.
Flip MBR key on the active GT card. Confirm the 
new DLKC card functions normally. On the new DLKC card, set the MB switch UP.
Insert the new DLKC card into the TSWM.
MBR (on the active GT card)
12 
						

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2.3.4 PLO Card Replacement Procedure
The PLO (PH-CK16/17/16-A/17-A) card is located in Slot No. 21 or 23 within the TSWM. Used to-
gether with a different direct digital interface circuit card, the card’s main function is to set up the clock
synchronization on the network. In addition, the MUSIC ROM supplies the hold tone to each station
line via the TSW circuit card. Use the procedures below to replace the PLO card with a spare.
Note:The ACT/STBY of PLO can be changed over via a single MB key operation on the circuit card. Though
its circuit is controlled by the GT (PH-GT09) card via TSW I/O bus, the switching system of PLO is not
affected by the speech path system changeover, differing from other echelons such as TSW, MUX,
DLKC. Refer to Section 12, System Control Procedures, in Chapter 6.
Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 PLO system is changed over from 
ACT to STBY mode.
 OPE lamp on the PLO card goes 
OFF.
Check the mate PLO cards following
lamp indication:
 OPE = Steady-green
A
START
Extract the PLO card to be replaced
from the TSWM. Check the mate PLOs ACT mode.  On the PLO (PH-CK16/17/16-A/17-A) card to be
replaced, set the MB key UP.
Set the keys on the new card according to
the card replaced. 
						

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Note:
After all steps are completed, check the ACT mode of TSW cards, which are in the same switching block
with the replaced PLO. Because the PLO-located MUSIC ROM supplies hold tones only to the TSW
cards belonging to the same switching block, verify all the TSW cards are also in the ACT-mode status.
Refer to Section 12, System Control Procedures, in Chapter 6.
 OPE lamp on the new card is OFF. 
Note
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
END
A
Insert the new PLO card into the TSWM. On the new PLO card, set the MB key UP.
Set the MB key on the new card DOWN. 
						

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2.3.5 PWR SW Card Replacement Procedure
The PWR SW (PH-PW14) card is located in Slot No. 00 or 01 within the TSWM. The card’s main
function is to supply DC -48V operating power to the same TSWM circuit cards and also DC +5, -5V,
and +12V output power to the MISC slots. Use the following procedures to replace the card with a new
one.
Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 P-ON lamp on the PWR SW card 
goes OFF.
 ALM lamp on the PWR SW card is 
red.
 P-ON lamp on the new card is OFF.
 ALM lamp on the PWR SW card is 
red.
 P-ON lamp on the new card is 
steady-green.
 ALM lamp on the PWR SW goes 
OFF.
END
START
Extract the PWR SW card to be replaced
from the TSWM.
On the new PWR SW card, set the SW key DOWN. On the PWR SW (PH-PW14) card, set the 
SW key DOWN.
Insert the new PWR SW card into the TSWM.
On the new PWR SW card, set the SW key UP. 
						

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2.3.6 MISC Card Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 Keep MB switch UP.
END
START
Extract the MISC card from its mounting slot.
Insert the new circuit card into the same 
mounting slot.
On the MISC card, set MB switch DOWN. On the MISC card, set MB switch UP. 
						

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3. PIM Accommodating Circuit Card Replacement Procedure
This section covers the procedures for replacing circuit cards mounted in the PIM (IMG0/1/2/3).
3.1 Precaution
 Use this procedure to replace a faulty circuit card with a spare or to check a spare card.
 There are functional switches (having set the default switch) on some of the circuit cards to be re-
placed. As for switch setting on the circuit cards, confirm the circuit card mounting face layout for the
PIM. When a circuit card with a default switch setting is replaced with a spare card, always make the
switch setting on the new circuit card the same as on the replaced card. Otherwise, electronic compo-
nents on the circuit card may be destroyed, or the circuit card itself may fail to function normally.
 When handling a circuit card, always use the field service kit as countermeasures against static elec-
tricity. Touching a circuit card without using the field service kit may destroy the card due to static
electricity on the human body.
3.2 Circuit Card Mounting Face Layout
Figure 4-18 shows the face layout of the circuit cards mounted in the PIM.
Figure 4-18   Circuit Card Mounting Face Layout of PIM Note:
This section also covers the procedure to replace the SDT (PA-SDTA/PA-SDTB) card. The card can
be mounted in any of the universal slots (Slots 04-12 or 15-23).
0 0102030405060708091011121314151617181920212223
LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK
LC/TRK LC/TRK LC/TRK MUX0 MUX1
LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK LC/TRK LC/TRKPWR1
PWR0
PIM
Slot No.Universal Slots Universal Slots
Improper key operations may result in a system down. Operate the keys with extreme care.
During replacement of a circuit card, the system issues system messages and activates the
related alarm. Reset the indicated alarm after completing the replacement procedure.
If the indicated alarm is cleared via the RALM command, the system also clears the whole
contents of the system message. Before using the RALM command, print the messages using
the DFTD command.
Use the ALM RST button only to reset the alarm lamps.WA R N I N G