Disassembly and Repair 5
Keysight U3401A User’s and Service Guide 87
To replace the power line fuse
The power line fuse is located within the multimeter’s fuse-holder assembly on
the rear panel. The multimeter is shipped from the factory with a power-line fuse
installed (according to country of destination). See Table 5-1. If you determine
that the fuse is faulty, replace it with one of the same size and rating.
Table 5-1 Type of supplied fuse (according to country of destination)
Type of fuse (time-lag, low breaking fuse) Input line voltage Part number
0.25A, 250V, 5x20 mm 100 V to 120 V A02-62-25592-3U
0.125A, 250V, 5x20 mm 220 V to 240 V A02-62-25648-1U
2 Remove the line voltage selector from
fuse holder assembly.
1 Disconnect the power cord. Depress tab 1 and
2 and pull the fuse holder from rear panel.
1
2
4 Replace fuse holder assembly in
rear panel.
3 Rotate the line voltage selector and
reinstall it back, so that the correct voltage
appears in the fuse holder window.
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