3Com NETBuilder II, Инструкция по установке, Страница: 40 / 82

2-12 C
HAPTER
2: NETB
UILDER
II 8-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 8-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 8-Slot 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 off the system and unplug the power cord from the outlet and the
power supply.
2 Pry the fuseholder cartridge loose from the power switch/fuseholder/receptacle
assembly using a small screwdriver.
Figure 2-11 Replacing the Fuse in an 8-Slot Chassis
3 Remove the spent fuse from the fuseholder cartridge.
4 Replace the old fuse with a new 6.3 A, 250 V, fast-blow fuse, 5 mm by 20 mm
in size.
5 Reinstall the fuseholder cartridge into the power switch/fuseholder/receptacle
assembly.
6 Make sure the power switch is off (O is pressed down). Plug the power cord
into the power supply and an outlet.
7 Turn on the system.
Replacing a
Floppy Disk Drive
To replace the floppy disk drive in the 8-Slot chassis, follow these steps. You will
need Phillips screwdrivers of various sizes.
1 Turn off the system and unplug the power cord from the outlet and the power
supply.
2 If your system is mounted in a rack, remove it from the rack and remove the
rack-mount brackets from the chassis.
3 Remove the cover from the chassis.
a Remove the screws from the back and sides of the chassis.
b Slide the cover toward the back of the chassis and lift it off.