Fluke NetDAQ 2640A, Service Manual

Page: 111 / 260

General Maintenance
Line Fuse
3
3-5
Replacing the Line Fuse 3-9.
The line fuse (15/100 ampere, 250V, time delay, PN 944629) is in series with the power
supply and located inside the instrument. To replace the fuse, refer to Figure 3-1 and the
following procedure:
WARNING
Do not operate the instrument without the cover properly
installed.
1. Disconnect all rear panel cables to the instrument power, Universal Input Module,
and I/O connectors.
2. Invert the instrument on a protective surface and remove the four 1/4-inch 6-32
Phillips-head screws on the bottom of the case.
3. Turn the instrument upright and remove the two 1/2-inch 6-32 Phillips-head screws
from the rear panel bezel.
4. Remove the rear panel bezel and case assembly. Do not touch any internal parts of
the instrument!
5. Locate the fuse holder at the back of the chassis near the power input connector.
Using a non-metallic tool, carefully pry the fuse from the holder.
6. Insert the new fuse into the holder. (You must use a 15/100 ampere, 250V, time
delay line fuse replacement, PN 944629.)
7. Reinstall the case to its original position (the rubber feet are towards the front of the
instrument).
8. Reinstall the rear panel bezel (rubber feet towards the bottom) and attach it with the
two 1/2-inch 6-32 Phillips-head screws.
9. Invert the instrument on the protective surface and reinstall the four 1/4-inch 6-32
screws on the bottom securing the case.
10. Reinstall the cables removed in Step 1.