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There are no user-serviceable parts in the power-supply section of the
MicroRack 16. Voltage setting changes and fuse replacement should
only be performed by qualified service personnel.
Switching the Power Supply On and Off
The power-supply on/off switch is located on the front panel. When the
MicroRack is plugged in and switched on, a red front-panel LED will glow.
Since the MicroRack is a hot-swappable rack, it is not necessary for any cards
to be installed before switching on the power supply. The power supply may
be switched off at any time without harming the installed cards.
Replacing the Power-Supply Fuse
The rack chassis power supply uses a 400-mA fuse for 120-VAC circuits, and a
200-mA fuse for 240-VAC circuits. The fuse compartment is located just below
the AC socket on the rear card. To replace the fuse:
1) Turn the power switch off and remove the power cord.
2) Using a small screwdriver, pop the compartment open (it will slide open
like a drawer). Depending upon the exact part used, the drawer may slide
completely out of the fuse holder, or it may stop partway out.
3) Note that there are two fuses in the drawer. The front fuse is the spare,
and the rear fuse is the "active" fuse.
4) If the active fuse appears to be blown, remove it from the clips and
replace it with the spare from the front compartment. Note the size
and rating of the blown fuse before discarding it.
5) Buy a replacement fuse at an electronics store.
For continued protection against the risk of fire, replace only with the
same type and rating of fuse.
WARNING!
WARNING!
CHAPTER 4: Installation
20
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