Replacement Procedure Of Fuse - NEC Univerge SV8500 Operation And Maintenance Manual

2.8

Replacement Procedure of Fuse

The system uses the following fuses as a protection against an overload resulting from
a short circuit.
When excessive current is applied to a PWR circuit card, the related fuse is blown. The blown fuse after a fault
can be confirmed as shown in the following figure.
A normal fuse
The purpose of fuses is to let them blow before the components are damaged. If any fuse gets blown, replace it
immediately with a new one using the following procedure:
(1) Confirm the blown fuse via System Message [6-A] or MJ lamp.
(2) Replace the fuse with the new one.
(3) Determine the cause of the blown fault.
CHAPTER 5
1.5A
12.5V
If a fuse is blown,
this area turns white.
– 590 –
Operation Procedure for System with PIR
25A
10A
A blown fuse
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required