Maintenance 5
Keysight U1251B and U1252B User’s and Service Guide 141
Replacing the fuse
Follow the procedures below to replace the fuse.
1 Turn the meter off and disconnect the test leads from the external equipment.
Make sure to remove the adaptor.
2 Wear clean/dry gloves and do not touch any other component except the fuse
and plastic parts. The current calibration is considered shunt only, so do not
recalibrate the meter after replacing the fuse.
3 Remove the battery cover compartment to replace the fuse.
4 Loosen the three screws on the bottom case and remove the cover.
5 Loosen the two screws on the top corners to lift the circuit board.
6 Gently remove the defective fuse by prying one end of the fuse loose and
removing it out of 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 holder.
8 Ensure that the rotary switch on the top case and the circuit board switch stay
on the OFF position.
9 Then re-fasten the circuit board and the bottom cover.
10 Refer to the table below for the part number, rate, and size of the fuses.
NOTE
This manual provides only the fuse replacement procedures, but not the fuse
replacement markings.
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