
F
PowerPak II Enclosure
GPS/GLONASS Receiver User Manual Rev 1
77
F.3.1 POWER SUPPLY CONSIDERATIONS
The PowerPak II enclosure incorporates a DC/DC power converter providing filtering, automatic reset circuit
protection and voltage regulation. It accepts a single input voltage between the range +10 to +36 V DC, which can
be supplied either from an automotive DC source or by the optional auto-ranging AC/DC converter (NovAtel part
number GPS-APRO) which operates over a range of 110 - 220 V AC and 50 - 60 Hz. The power input is reverse-
polarity protected. Refer to Table F.1, Page 75, for further information.
WARNING: The MiLLennium-GLONASS GPSCard will suspend operation if voltage supplied falls outside
input range +10 to +36 V DC.
F.3.2 ACCESSING THE POWER BOARD FUSE
The power board incorporates a 2-amp normal-blow fuse, located near the rear of the power board. Follow these
instructions to check or replace this fuse.
CAUTION
•
Be sure that the power plug is disconnected from the PowerPak II before you attempt to remove the front panel.
•
Use the wrist strap to properly discharge static build-up before handling the printed circuit boards.
•
Use anti-static precautions whenever the PowerPak II is opened.
To access the power fuse follow these steps:
1.
Remove the four corner screws from each of the front and back panels of the PowerPak II enclosure.
2.
Remove the rear panel to create an opening into the enclosure.
3.
Through this opening, push both the GPSCard and power card forward as far as you can. This will
expose the back plane, GPSCard, and the power board.
4.
Now, from the other end, grasp the exposed edges of the GPSCard and the power card and gently pull
until approximately 3/4 of both cards are extended beyond the front panel opening.
5.
The fuse will now be fully exposed for checking or replacement.
6.
When finished, push on the front panel until it is seated against the main enclosure; then replace the
screws on the front and rear panels.
See Figure F.4, Page 78 for more details.
CAUTION: Do not pull on the front panel in order to remove the GPSCard and power card from the PowerPak
II enclosure; cable damage will result.