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Maintenance
Introduction
6
6-3
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.
6-1. Introduction
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.
6-2. Replacing the Fuse
Caution
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.