Filter
Top Products
CHAPTER 4 NDA-24300
Page 308
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Perform the procedure in Figure 4-33 to confirm the cause of the DC-48V fuse blown fault.
Figure 4-33 DC -48V Fuse Blown Fault Flowchart
Start
Visual check: No pin contacting
or backboard melting?
OPE Lamps (green) of
LC/TRK/NCU cards remain lit?
Make sure in which module
the fuse has blown
No
1. Turn ON (UP) the MB key
on the circuit card.
2. Remove the card from the PIM.
3. Replace the fuse with a new one.
Turn ON (UP) the MB
keys on the whole circuit
cards, and remove them from
the PIM. (Only PWR cards
are inside the PIM)
Turn ON (UP) the MB
keys on the whole circuit
cards, and remove them from
the PIM. (Only PWR cards
are inside the PIM)
The replaced fuse
is blown again?
No
No
No
No
Fault of circuit card that
accompanied the fuse blown.
Perform system initialization
after inserting all removed cards.
Fault of circuit card
that was removed
Replace the blown fuse
with a new one.
Replace the blown fuse
with a new one.
Yes
Yes
Yes
Insert the removed cards
one by one (into the PIM).
Is there any fuse blowing?
The replaced fuse
is blown again?
The fuse is still blown?
There is a short circuit on the
backboard of the PIM.
Fault of PWR card.
Replace the PWR card
Yes
Yes
LPM / TSWM / PIM
No
Fault of circuit card that
accompanied the fuse blown.
Perform system initialization
after inserting all removed cards.
Yes
Insert the removed cards
one by one (into the PIM).
Is any fuse blown?