3Com NETBuilder II, Installing Instruction, Page: 22 / 82

1-12 C
HAPTER
1: NETB
UILDER
II 4-S
LOT
B
RIDGE
/R
OUTER
Replacing a Fuse This section explains how to replace the fuse located in the power supply
module in your 4-Slot chassis.
A single fuse mounted in a removable cartridge is located inside the AC power
switch/fuseholder/receptacle assembly on the rear of the chassis.
WARNING: If your system persistently blows fuses, there may be a problem
with either your power supply or your facility’s supply voltage. Contact your
network supplier for assistance.
For continued protection against fire hazard, replace the fuse only with a fuse
of the same type and rating. Using an incorrect fuse can subject your system to
overcurrent conditions, resulting in damage or unsafe operating conditions.
To change the fuse in the power supply, follow these steps. You will need a
small, flat-head screwdriver.
1 Turn the system off and unplug the power cord from the outlet and the
power supply.
2 Pry the fuseholder cartridge loose from the switch/fuseholder/receptacle
assembly using the screwdriver. It should pop out easily.
Figure 1-12 Prying the Fuseholder Cartridge Loose
3 Slide the fuseholder cartridge completely out of the power supply.
Figure 1-13 Removing the Fuseholder Cartridge from the Power Supply