Operator Maintenance; To Replace The Power-Line Fuse; To Replace The Current Input Fuses - HP 34401A User Manual

Chapter 3 Features and Functions

Operator Maintenance

Operator Maintenance
This section describes how to replace the power-line and current fuses.
If you need additional information about replacing parts or repairing
the multimeter, see the Service Guide.

To Replace the Power-Line Fuse

The power-line fuse is located within the multimeter's fuse-holder
assembly on the rear panel (see also page 15). See the rear panel of the
multimeter for the proper fuse rating. To replace a 250 mAT fuse, order
HP part number 2110-0817. To replace a 125 mAT fuse, order HP part
number 2110-0894.

To Replace the Current Input Fuses

The front and rear current input terminals are protected by two series
fuses. The first fuse is a 3A, 250 Vac, fast-blow fuse and is located on the
rear panel. To replace this fuse, order HP part number 2110-0780.
With a small flatblade screwdriver, push in on the fuse cap
and rotate it counterclockwise. Remove the fuse cap and fuse.
A second fuse is located inside the multimeter to provide an additional
level of current protection. This fuse is a 7A, 250 Vac, high-interrupt
rated fuse (HP part number 2110-0614). To replace this fuse, you must
remove the multimeter's case by loosening three screws. See the Service
Guide for more information on disassembling the multimeter.
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