Fluke 5725A instruction manual Introduction, Replacing the Fuse

Maintenance 6

Introduction

Warning

Servicing described in this section is to be done by qualified service personnel only. To avoid electrical shock, do not service the 5725A unless you are qualified to do so.

Introduction 6-1.

This section explains how to do routine maintenance tasks and how to access internal modules for troubleshooting and repair. This section tells you how to do the following:

∙Replace the line power fuse

∙Clean the air filter, and how often to do so

∙Clean external surfaces and internal pca’s

∙Access internal modules for servicing

For troubleshooting information, refer to Section 7. For pointers to calibration information, refer to Section 5.

Replacing the Fuse 6-2.

wCaution

To prevent instrument damage, verify that the correct fuse is installed for the line voltage setting. Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent, of the appropriate amperage rating. Use only a 4A, 250V fast-blow fuse when the line voltage selection switches are set in the range 200-240V.

Note

A spare 4A, 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200 to 240V range.

The line power fuse is accessible on the rear panel. The fuse rating label to the right of the fuse holder (labeled FUSE) shows the correct replacement fuse rating for each line voltage setting. To replace the fuse, refer to Figure 6-1, and proceed as follows:

1.Turn off the POWER switch and disconnect the line power cord from ac line power.

2.Insert the blade of a standard screwdriver into the slot of the fuse holder labeled FUSE.

3.Turn the screwdriver counterclockwise until the cap and fuse pop free.

4.To install a new fuse, reverse this procedure.

6-3