Справочник Пользователя для National Instruments NI PXI-1056

The PXI-1056 power-supply shuttle is a replacement part for the PXI-1056 
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 position. Disconnect the power cable and any other 
cables from the power-supply shuttle on the rear of the chassis. Identify the 
4 screws that attach the power-supply shuttle back cover to the chassis. 
Refer to Figure 1-2, 

, for the screw 

locations. Using a number 1 Phillips screwdriver, remove the screws. Pull 
on the two rear handles of the power-supply shuttle cover to remove it. 
Unscrew the two thumbscrews on the bottom of the power supply shuttle 
and remove the shuttle from the rear of the chassis.

The 4 power supply shuttle screws (4-40 

× 1/4 in.) are not explicitly identified in 

Figure 1-2, 

, but it can be used as a visual reference. 

There are four screws evenly spaced along the left and right edges.

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. Install the new power-supply shuttle into 
the opening on the rear of the chassis. Tighten the two thumbscrews with a 
flat-head screwdriver using 5 in. lbs of torque, install the back cover, and 
tighten the 4 screws with a Phillips screwdriver (maximum torque 
of 5 in. lbs). 

The fan-speed selector switch is on the rear panel of the power-supply 
shuttle. Refer to Figure 1-2, 

,

 

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.

Refer to the 

 section of Chapter 2, 

.

Refer to the 

 section of Chapter 2, 

.