Chapter 6
Common Questions and Troubleshooting
©
National Instruments Corporation
6-7
VXIpc 770/870B Series User Manual
How do I change the main power fuse?
The VXIpc 770/870B Series is equipped with a user-replaceable fuse on
the main power, +5 V from the VXIbus. All other voltages are fused with a
resettable-style circuit breaker. The resettable-style circuit breakers do not
require user intervention. When a short circuit condition is removed, they
automatically reset themselves.
The main power, +5 V, is too high of a current for resettable fuse
technology, so your kit includes a replaceable fuse of type 3AG, 15A,
32V Slowblow.
You can replace this fuse without having to remove the cover. The fuse is
accessible through the rear of the unit as shown in Figure 6-1.
Figure 6-1.
Main Power Fuse Replacement
To replace a fuse, complete the following steps:
1.
Turn off the VXI mainframe and remove the VXIpc 770/870B Series
module.
2.
Using a small flathead screwdriver, turn the fuse holder
counter-clockwise until the fuse and holder start to come out of
the unit.
Caution
Do
not
replace with a higher-rated fuse. This could cause damage to the
VXIpc 770/870B, the VXI mainframe, or both.
1
Fuse Holder
1
