© National Instruments Corporation 29 SCXI Quick Start Guide
Complete the following steps to check or replace fuses.
1. Power off the chassis and remove the power cord.
2. Remove the four screws that secure the fan and filter to the rear of the
chassis. When removing the last screw, be careful to hold the fan to
avoid breaking the fan wires.
3. To check whether a fuse is blown, connect an ohmmeter across the
leads. If the reading is not approximately 0 Ω, replace the fuse. The
fuse marked with a copper + on the backplane is for the positive analog
supply, and the fuse marked with a copper – is for the negative analog
supply.
4. Using long-nose pliers, carefully remove the fuse.
5. Take a new fuse and bend its leads so the component is 12.7 mm
(0.5 in.) long—the dimension between the fuse sockets—and clip
the leads to a length of 6.4 mm (0.25 in.).
6. Using long-nose pliers, insert the fuse into the socket holes.
7. Repeat steps 3 through 6, if necessary, for the other fuse.
8. Align the fan and filter with the fan holes, making sure that the label
side of the fan is face down. Reinstall the four screws and make sure
the assembly is secure.
Refer to the chassis user manuals for fuse specifications.
My chassis worked until I inadvertently removed and reinserted a
module while the chassis was powered on. Now my chassis does not
power on. What can I do?
SCXI modules are not hot-swappable, so you might have blown a
chassis fuse. If replacing the fuse does not correct the problem, you might
have damaged the digital bus circuitry or the SCXI module. Contact
NI Technical Support at
ni.com/support for assistance.
MAX does not recognize my chassis when I perform a test. What can
Ido?
Check the following items:
• Verify the chassis is powered on.
• Verify the chassis is correctly cabled to a DAQ device. If more than one
DAQ device is installed in your PC, verify the device selected for
Chassis Communicator is actually connected to the chassis.
• Check backplane pins to determine if any were bent during installation
of the modules.
• Verify correct placement and configuration of the modules. If you did
not auto-detect modules, modules installed in the chassis may not be
configured in software. Alternately, modules configured in software
might not match the ones installed in the chassis.
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