Maintenance 5
Keysight U1253B User’s and Service Guide 159
Fuse replacement
Replace any blown fuse in the multimeter according to the following procedures:
1 Turn the multimeter off and disconnect the test leads. Ensure that the
charging adapter is also removed, if it is attached to the multimeter.
2 Wear clean and dry gloves on your hands and avoid touching any components
except the fuse(s) and plastic parts. It is not necessary to recalibrate the
multimeter after replacing a fuse.
3 Remove the battery cover compartment.
4 Loosen two side screws and one lower screw on the bottom case and remove
the bottom case.
5 Loosen the two screws on the top corners to take out the circuit board.
6 Gently remove the defective fuse by prying one end of the fuse loose and
removing it from the fuse bracket.
7 Replace with a new fuse of the same size and rating. Make sure the new fuse is
centered in the fuse bracket.
8 Ensure that the knob of the rotary switch on the top case and the
corresponding switch on the circuit board remain at the OFF position.
9 Re-fasten the circuit board and the bottom cover.
10 Refer to Table 5-4 on page 160 for the part number, rating, and size of the fuses.
This manual provides only the fuse replacement procedures, but not the fuse
replacement markings.
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