Chapter 3
Maintenance
3-4
ni.com
Removal
The PXI-1044 power-supply shuttle is a replacement part for the PXI-1044
chassis. Before attempting to replace the power-supply shuttle, verify that
there is adequate clearance behind the chassis. Set the power switch on the
front panel to the Off (nonrecessed) position. Disconnect the power cable
and any other cables from the power-supply shuttle on the rear of the
chassis. Identify the 10 screws that attach the power-supply shuttle to the
chassis. Refer to Figure 1-2,
Rear View of the PXI-1044 Chassis
, for the
screw locations. Using a number 1 Phillips screwdriver, remove the screws.
Pull on the two rear handles of the power-supply shuttle to remove it from
the rear of the chassis.
Note
The 10 power supply shuttle screws (4-40
×
1/4 in.) are not explicitly identified in
Figure 1-2,
Rear View of the PXI-1044 Chassis
, but it can be used as a visual reference.
The appropriate screws are located along the outer edges of the chassis’ rear panel. There
are six screws evenly spaced along the top and bottom edges, and four screws evenly
spaced along the left and right edges.
Installation
Ensure that there is no visible damage to the new power-supply shuttle.
Verify that the housing and connector on the new power-supply shuttle
have no foreign material inside. Remove the protective cap on the internal
10 MHz REF connector (this is the connector that mates with the chassis
backplane, not the BNC connectors on the rear panel). Install the new
power-supply shuttle into the opening on the rear of the chassis. Insert
and tighten the 10 screws with a Phillips screwdriver (maximum torque
of 5 in. lbs).
Configuration
The fan-speed selector switch is on the rear panel of the power-supply
shuttle. Refer to Figure 1-2,
Rear View of the PXI-1044 Chassis
,
to locate
the fan-speed selector. Select HIGH for maximum cooling performance
(recommended) or AUTO for quieter operation. When set to AUTO,
air-intake temperature determines the fan speed.
